CAT 7.07
Elastomeric Antivibration Mountings
Form A, page 6
Form B, page 7
Form C, page 8
Form D, page 9
Form E, page 10
STC, page 23
Form CT, page 11
O mount, page 22
Form KE, page 11
RU, page 22
www.farrat.com
Form DS, page 10
Form AT, page 12
AWR(P) page 21
KP, page 12
REF, page 20
RMR, page 13
AWS, page 20
RTS, page 14
AW, page 20
RMA, page 19
RMF, page 18
Isomount, page 17
REM, page 16
RP, page 15
Vibration Isolation
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Vibration Isolation
Vibration transmissibility
Isolator Natural frequencies ƒn
Undamped
Vibration transmissibility T (i.e. % or fraction) of the vibration
which the isolators transmit to the supported equipment (passive)
or from the supported equipment (active) is calculated using the
formula
fn =
1
2π
K
M
Transmissibility T =
Damped
fn =
1
2π
1
1−R
2
Damped systems:
K (1-ζζ2)
M
2
1+
R
2
Q
Transmissibility T =
ζ= Damping Ratio C/Cc
K= Spring Constant N/m
M= Supported Mass kg
For effective vibration isolation the isolator natural frequency fn
sholud be less than 50% the lowest disturbing frequency fe
Elastomeric rubber-metal isolators are used to prevent transmission
of vibration from (active) or to (passive) supported equipment.
Rubber based anti vibration mounts offer good isolation of
disturbing frequencies ƒe of 12 Hz and above at reasonable cost.
To isolate frequencies below 12 Hz low frequency isolators
should be used.
Natural
Frequency
ƒn Hz
Isolate above
Disturbing Frequency
ƒe Hz
1.5+
2.5+
3+
5+
Air systems
Helical Coil spring systems
Compare
Rubber Metal AV Mounts
10
8
12+
0.1
4
ƒe
ƒn
Q=
1
2 C/Cc
ƒe - disturbing frequency can be determined
by measurement. The isolator natural frequency
ƒnd is given by:
fnd = 1
2π
Ktd
M
Hz
Ktd = Sum of Isolator Dynamic Spring Constants
(K1+K2+K3...) N/m
M = Supported system mass kg
For natural rubber and coil spring isolators
static and dynamic spring constants are the same.
Sources of vibration in rotating machines
Source
Disturbing Frequency fe Hz
Primary out of balance
Secondary out of balance
Shaft misalignment
Bent Shaft
Gears(N=number of teeth)
Drive Belts (N=belt rpm)
Aerodynamic or hydraulic forces
Electrical (N=synchronous frequency)
1 x rpm x 0.0167
2 x rpm x 0.0167
2 x rpm x 0.0167
1 & 2 x rpm x 0.0167
N x rpm x 0.0167
N,2N,3N,4N x 0.0167
(N=blades on rotor) N x rpm x 0.0167
N x rpm x 0.0167
Significant problems occur when the disturbing frequency fe is near to or
coincident with the natural frequency of the supporting structure (floor,
foundation or subsoil).
0.5
1.0
1.0
0.8
0.6
0.2
1.0
0.1
0.5
0.2
0.04
0.1
0.02
0.01
0.1
Fig 2.1
0.2
0.4 0.6 1.0 1.4 2
Ratio fe / fnd = R
4
0.05
0
6 8 10
Damping Ratio C/Cc
0.4
0.06
2
2
0.2
2
Transmissibility T
6.0+
0
0.05
6
R
Q
R=
Examples
2
2 2
(1 - R ) +
Damping
Factor
C/Cc
1.5
0.05
20
0.10
19
0.15
17
0.20
16
0.30
12
frequency ratio R fe/ƒn
2.0
66
64
62
59
52
2.5
80
79
76
74
67
3.0
87
85
83
81
75
3.5
91
89
87
85
80
4.0
93
91
90
87
83
Percentage Isolation Efficiency
4.5
94
93
91
89
85
5.0
95
94
93
91
87
Vibration Isolation
www.farrat.com
Vibration Isolators Undamped
Damping is expressed as a ratio C/Cc (ζ) which is a fractional measure of vibration energy absorbed by the isolator and not given back to
the isolated equipment but dissipated into heat within the isolator.
Force equation
Rubber metal anti vibration mountings are generally made using
NR Natural Rubber which has low damping.
M A + Kz = F(t)
M=
A=
K=
F=
z=
ω=
Mass Kg
Acceleration m/s2
Spring Constant N/m
Applied force N
Deflection m
2π ƒ
This is to
a) Provide efficient vibration isolation
b) Avoid excessive heat build up when isolating active vibration
sources.
Units
Displacement response:
Sr =
F
K−M ω2
m
Velocity response
Vr=
Fω
K−M ω2
m/s
Acceleration response
Ar=
F ω2
K−M ω2
m/s2
Fr=KSr=
KF
K−M ω2
N
Force transmitted
Where oil and other contamination is present the anti vibration mount
must be designed so as to prevent the contaminants coming in contact
with the rubber. Alternatively NBR (Nitrile) rubber isolators can be
used, which have high oil and chemical resistance.
Phase lag (angle)
When a damped isolator is subject to an input vibration the
reactive response lags behind the input which can be expressed as a
phase lag (angle). The greater the phase lag, the greater the damping
and dissipated energy.
Phase Lag between response and excitation is given by:
ω /ω
ω0 -ω0/ω) )
Phase lag (angle) ϕ = tan-1 (1/Q(ω
Vibration Isolators with damping
ω0 =
Force equation
ω = 2π ƒe
MA +CV+ Kz = F(t)
K = Isolator Spring Constant N/m
M = Supported Mass kg
ƒe = disturbing frequency Hz
Inertia force + damping force+ spring force= applied force
M = Mass Kg
A = acceleration m/s2
V = Velocity m/s
C = Damping coefficient Ns/m
K = Spring Constant N/m
F = Applied force N
z = Deflection m
ζ = Damping ratio C/Cc
Cc = 2 KM
Damping is required where movement of the supported equipment
must be minimised especially at resonance. Damping is also required
when shock is to be absorbed.
Units
Displacement response:
Sr =
Velocity response
Vr =
Acceleration response
Ar =
Force transmitted
K
M
Fr =KSr=
F
K (1+(2 ζ)2)
F
m
(K/M)*(1-ζζ2)
m/s
K (1+(2ζζ)2)
F(1-ζζ2)
M (1+(2ζζ)2)
m/s2
F
(1+(2ζζ)2)
N
Isolators with
C/Cc
No damping
0
Low damping
0.01
Moderate damping 0.05
Good damping
0.1
High damping
0.2- 0.3
Product
Helical Springs
NR Natural Rubbers
CR Neoprene / Chloroprene Rubbers
NBR Nitrile Rubbers
Helical spring with viscous
damping
Against receipt of full information free advice and proposals will
be given for the use of all Farrat products.
A charge may be made where a detailed site survey is required
involving vibration measurements.
Farrat are certified to
TUC UKQA ISO 9001/2000
3
Vibration Isolation
A = acceleration m/s2
V = velocity m/s
D = displacement m
C = damping coefficient Ns/m
K = spring constant N/m
P = Peak vibration force N
f = frequency Hz
Relationships between vibration units
RMS = √ 2* (Peak)
ω = 2π ƒ
A = ωV
V = A/ω = A/2π f
V = ωD
D = V/ω
The above formula are valid for both vertical and horizontal
vibrations
Vertical Axis Z
Longitudinal Axis Y
Transverse Axis X
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Natural frequencies and Coupled Modes
In most applications the vertical natural frequency of an isolation
system is considered to be the most important. However the position of the isolators in relation to the equipment Centre of Gravity
(C/g) should be taken into account.
Uncoupled Modes
Isolators are in the same horizontal
plane as the C/g. Vertical, horizontal
and rotational modes are uncoupled.
Coupled Modes
Isolators below the C/g
The motion of the system is a
combination of vertical, horizontal
and rotational motion coupled with
rocking about a lower or upper
rocking centre.
Fig 4.1
H
H = Maximum
for stability
Stability limit
The maximum distance H of isolators below the C/g is given by an
equilateral triangle connecting isolators to each other and the C/g.
Distribution of Load on unsymmetrical supported mass
Determination of undamped Vertical Natural Frequency from static
vertical deflection
Total Load Lt
L.A
L.B
L.C
L.D
Lt*((b-c)/b)*(d/a)
Lt*(c/b)*(d/a)
Lt*(c/b)*((a-d)/a)
Lt*((b-c)/b)*( ((a-d)/a)
1
δ
δ = static deflection (mm)
fn = 15.76
a
Fig 4.2
It is important to aim for as near as possible the same static
deflection for each isolator by selecting suitable sizes and
stiffnesses to match loads at each point.
A
D
Static deflection at A mm = L.A/K.A etc.
c
K.A= Vertical Spring Constant of isolator at A N/mm
L.A= Static Load N at A
b
Vertical Natural Frequency
fnv = 1
2π
Kt *1000
M
M= total equipment mass kg
K.T = K.A + K.B + K.C + K.D N/mm
When specifying Isolators it is important to ensure that the vertical
and horizontal isolator natural frequencies are less than 50% of the
lowest significant disturbing frequencies (determined by rotating
speeds) or by measurement.
4
Center of
Gravity
B
C
d
aaaa
a
Rubber Metal Vibration Isolators
www.farrat.com
Shearing force (F)
Compression force (F)
Loaded
area (A)
Loaded area (A)
aaaa
a
aa
H
H
Fig 5.1
Unstressed
Stressed
Unstressed
Stressed
Rubber is produced in Natural,Synthetic or Thermoplastic forms
NR Natural.
Very high resilience
Low damping for maximum vibration
isolation efficiency.
Very low creep.
Low chemical and oil resistance
NBR Nitrile.
Moderate resilience
Damping ratio C/Cc=ζ= ca 0.10
Low creep
High oil and chemical resistance
Typical Applications
Anti vibration mountings in hydraulic and
other chemical environments.
Shock absorption pads
Anti vibration pads for plant and machinery
Typical Applications
Acoustic damping pads
Floating floors
Structural bearings
Anti vibration pads
Sensitive equipment isolation
aa
Typical Applications
Low frequency anti vibration mountings
Structural bearings
CR Chloroprene / Neoprene
High resilience
Damping ratio C/Cc=ζ= ca 0.05
Low creep
Moderate oil and chemical resistance
Fire retardant properties
Synthetic rubbers
Synthetic rubbers come in many
formulations depending on
application requirements.
a
Commonly used for anti vibration
mountings requiring damping and or
good oil and chemical resistance.
Optimium support design for Rubber Isolators
Compression
Load (Ft)
α
Fig 5.2
Loaded area (A)
H
www.farrat.com
For maximum elastically supported stability, positioning rubber
metal isolators at an angle to the vertical loads the rubber in a
combination of shear and compression. Ideally the shear and
compression deflection should be almost the same. To achieve
0.
this the angle should be 30
To calculate vertical deflection δt (mm):
Ft *H
δt =
2* A(G sin2α + Ec cos2α)
G = Shear Modulus (N/mm2)
Ec = Compression Modulus (N/mm2)
H = Rubber height (mm)
= Loaded rubber area (mm2)
A=
Ft = Load (N)
The information contained in this brochure is intended to be a guide only. We suggest product samples be tested and approved based
on your intended applications. We reserve the right to alter specifications or withdraw products with or without prior notice.
5
Form A
www.farrat.com
D
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
L
H
Order Examples: R05045AN6
R05045ANB6 (NBR)
L
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
Fig 6.1
M
Rubber Metal Isolators, Form A, Natural Rubber (NR)
6
Screw
M
L
Thread
Length
mm
mm
D
H
Farrat Code
mm
mm
R00808 AN4
R01010 AN4
R01010 A N6
R01010 AN7
R01515 AN4
R01515 AN6
R01515 AN7
R02015 AN4
R02015 AN6
R02015 AN7
R02020 AN4
R02020 AN6
R02020 AN7
R02025 AN4
R02025 AN6
R02025 AN7
R02530 AN4
R02530 AN6
R02530 AN7
R03030 AN4
R03030 AN6
R03030 AN7
R04030 AN4
R04030 AN6
R04030 AN7
R05030 AN4
R05030 AN6
R05030 AN7
R05045 AN4
R05045 AN6
R05045 AN7
R06035 AN4
R06035 AN6
R06035 AN7
R07550 AN4
R07550 AN6
R07550 AN7
R07555 AN4
R07555 AN6
R07555 AN7
R10055 AN4
R10055 AN6
R10055 AN7
R10075 AN6
R12555 AN4
R12555 AN6
R12555 AN7
R15055 AN4
R15055 AN6
R15055 AN7
8
8
3
6
10
10
4
10
15
15
4
13
20
15
6
16
20
20
6
16
20
25
6
18
25
30
6
18
30
30
8
20
40
30
8
23
50
30
10
28
50
45
10
28
60
35
10
28
75
50
12
37
75
55
12
37
100
55
16
45
100
75
16
45
125
55
16
45
150
55
16
45
Stock
1
1
3
1
1
3
3
1
2
3
2
2
3
2
2
3
1
2
3
1
1
3
2
2
2
1
3
3
1
3
3
3
3
3
3
2
2
2
3
3
2
1
1
1
3
3
3
3
1
3
Rubber
Hardness
Grade Ihrd Sh.A
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR/NBR
NR
NR
NR/NBR
NR
NR
NR
NR
NR
NR/NBR
NR
NR
NR/NBR
NR
NR
NR
NR
NR/NBR
NR/NBR
NR
NR
NR
NR
NR
NR
NR
NR
NR/NBR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
45
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
60
45
60
70
45
60
70
Max.
Load
N
Vert.
Spring
Rate
N/mm
Defl.
at Max.
Load
mm
Horiz.
Spring
Rate
N/mm
16
25
60
100
50
117
203
125
279
450
96
220
380
88
200
350
129
300
525
192
450
780
384
870
1479
768
1695
2853
544
1278
2205
1071
2335
3938
1385
3130
5300
1309
2970
5049
2932
6380
10725
5213
6050
12650
20680
10423
21285
345134
20
25
60
100
33
78
135
83
186
300
48
110
190
35
80
140
43
100
175
64
150
260
128
290
493
256
565
951
123
284
490
306
667
1125
277
626
1060
238
540
918
533
1160
1950
695
1100
2300
3760
1895
3870
6275
0.80
1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
1.50
2.00
2.00
2.00
2.50
2.50
2.50
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
4.50
4.50
4.50
3.50
3.50
3.50
5.00
5.00
5.00
5.50
5.50
5.50
5.50
5.50
5.50
8.50
5.50
5.50
5.50
5.50
5.50
5.50
4
5
9
14
6
9
12
11
17
24
8
12
17
7
10
14
9
13
18
13
19
26
23
34
48
35
53
74
23
35
49
44
65
91
48
71
100
43
65
91
77
106
150
646
976
2065
3458
1677
3471
5744
Form B
www.farrat.com
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
D
L
Order Examples: R05045BN6
R05045BNB6 (NBR)
H
t
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
M
Fig 7.1
Rubber Metal Isolators, Form B, Natural Rubber (NR)
Farrat Code
R01010
R01010
R01010
R01515
R01515
R01515
R02015
R02015
R02015
R02020
R02020
R02020
R02025
R02025
R02025
R02530
R02530
R02530
R03030
R03030
R03030
R04030
R04030
R04030
R05045
R05045
R05045
R06035
R06035
R06035
R07525
R07550
R07550
R07550
R10055
R10055
R10055
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN4
BN6
BN7
BN7
BN4
BN6
BN7
BN4
BN6
BN7
mm
M
Thread
mm
Screw
L
Length
mm
t
Depth
mm
10
10
4
10
3
15
15
4
13
4
20
15
6
20
20
6
20
25
6
18
6
25
30
6
8
6
18
18
18
6
30
30
8
20
8
40
30
8
23
8
50
45
10
75
35
36
35
25
75
100
D
H
mm
60
15
15
18
15
18
15
5
6
10
12
10
12
25
25
28
27
37
27
27
10
10
10
12
50
12
25
12
55
16
45
45
44
16
10
Stock
1
3
3
1
3
3
2
2
3
3
1
3
2
2
3
1
2
3
2
2
3
2
2
3
2
2
3
3
2
3
1
2
2
3
3
3
1
Rubber
Hardness
Grade Ihrd Sh.A
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
70
45
60
70
45
60
70
Max.
Load
N
Vert.
Spring.
Rate
N/mm
Defl.
at Max.
Load
mm
25
60
100
50
117
203
125
279
450
96
220
380
88
200
350
129
300
525
192
450
780
384
870
1479
554
1278
2205
1071
2335
3938
8000
1385
3130
5300
2650
5850
10000
25
60
100
33
78
135
83
186
300
48
110
190
35
80
140
43
100
175
64
150
260
128
290
493
123
284
490
306
667
1125
4000
277
626
1060
530
1170
2000
1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
1.50
2.00
2.00
2.00
2.50
2.50
2.50
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
4.50
4.50
4.50
3.50
3.50
3.50
2.00
5.00
5.00
5.00
5.00
5.00
5.00
7
Form C
www.farrat.com
D
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
H
Order Examples: R05045CN6, R05045CNB6 (NBR)
t
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
M
Fig 8.1
Form C, Natural Rubber (NR)
Screw
Farrat Code
R01010 CN4
R01010 CN6
R01010 CN7
R01515 CN4
R01515 CN6
R01515 CN7
R02015 CN4
R02015 CN6
R02015 CN7
R02020 CN4
R02020 CN6
R02020 CN7
R02025 CN4
R02025 CN6
R02025 CN7
R02530 CN4
R02530 CN6
R02530 CN7
R03030 CN4
R03030 CN6
R03030 CN7
R04030 CN4
R04030 CN6
R04030 CN7
R05045 CN4
R05045 CN6
R05045 CN7
R06030 CN4
R06030 CN6
R06030 CN7
R06035 CN4
R06035 CN6
R06035 CN7
R07550 CN4
R07550 CN6
R07550 CN7
R07555 CN4
R07555 CN6
R07555 CN7
R10045 CNB4
R10055 CN4
R10055 CN6
R10055 CN7
R10075 CN4
R12555 CN4
R12555 CN6
R12555 CN7
R15055 CN4
R15055 CN6
R15055 CN7
R200100CN4
8
D
H
mm
M
Thread
mm
t
Depth
mm
mm
10
10
4
3
15
15
4
4
20
15
6
6
20
20
6
6
20
25
6
6
25
30
6
6
30
30
8
8
40
30
8
8
50
45
10
10
60
30
10
10
60
35
36
35
10
10
75
50
12
12
75
55
12
12
100
45
16
16
100
55
16
16
100
75
16
16
125
55
16
16
150
55
16
16
200
100
16
16
Stock
1
3
3
1
3
3
3
3
3
2
2
3
1
2
3
3
3
2
2
2
2
2
2
3
2
2
2
3
3
3
3
2
3
1
3
3
2
3
3
1
3
2
3
3
3
3
1
3
3
3
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR/NBR
NR
NR
NR
NR/NBR
NR
NR
NR
NR/NBR
NR/NBR
NR
NR
NR/NBR
NR
NR
NR/NBR
NR/NBR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR/NBR
NR
NR
NBR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR/NBR
NR
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
45
60
70
60
45
60
70
45
60
70
45
Max.
Load
N
Vert.
Spring
Rate
N/mm
Defl.T
at Max.
Load
mm
25
60
100
50
117
203
125
279
450
96
220
380
88
200
350
129
300
525
192
450
780
384
870
1479
554
1278
2205
1145
2479
4186
1071
2335
3938
1385
3130
5300
1309
2970
5049
5300
2932
6380
10725
5213
6050
12650
20680
10423
21285
34513
10330
25
60
100
33
78
135
83
186
300
48
110
190
35
80
140
43
100
175
64
150
260
128
290
493
123
284
490
382
826
1395
306
667
1125
277
626
1060
238
540
918
1240
533
1160
1950
695
1100
2300
3760
1895
3870
6275
1033
1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
1.50
2.00
2.00
2.00
2.50
2.50
2.50
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
4.50
4.50
4.50
3.00
3.00
3.00
3.50
3.50
3.50
5.00
5.00
5.00
5.50
5.50
5.50
4.30
5.50
5.50
5.50
7.50
5.50
5.50
5.50
5.50
5.50
5.50
10.00
Form D
www.farrat.com
M
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
L
Order Example: RD02020 N6, RD02020 NB6 (NBR)
H
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
D
Fig 9.1
Form D, Natural Rubber (NR)
Screw
Farrat Code
RD01010
RD01010
RD01010
RD01515
RD01515
RD01515
RD02015
RD02015
RD02015
RD02020
RD02020
RD02020
RD02025
RD02025
RD02025
RD02525
RD02525
RD03030
RD03030
RD03030
RD04030
RD04030
RD05020
RD05020
RD05020
RD07525
RD07525
RD07525
RD10050
RD10050
RD10050
N4
N6
N7
N4
N6
N7
N4
N6
N7
N4
N6
N7
N4
N6
N7
N4
N6
N4
N6
N7
N4
N6
N4
N6
N7
N4
N6
N7
N4
N6
N7
D
H
mm
M
Thread
mm
L
Length
mm
mm
10
10
4
10
15
15
4
14
20
15
6
16
20
20
6
18
20
25
6
18
25
25
25
25
6
6
18
18
30
30
8
20
40
40
30
30
8
8
25
25
50
20
10
25
75
25
12
37
100
50
16
45
Load in Compression
Load in Shear
Stock
3
3
3
3
3
3
3
3
3
3
2
3
3
3
3
2
2
2
2
2
2
2
1
2
3
1
2
3
3
2
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
45
60
70
45
60
70
45
60
70
45
60
70
45
60
70
45
60
45
60
70
45
60
45
60
70
45
60
70
45
60
70
Max.
Load
N
Vert.
Spring
Rate
N/mm
Defl.
at Max.
Load
mm
24
55
94
46
110
188
113
250
436
88
206
356
78
188
324
119
285
178
422
728
351
808
1364
2790
4565
544
1255
2148
2404
5319
9049
24
55
94
31
73
125
75
167
291
44
103
178
31
75
130
40
95
59
141
243
117
269
649
1329
2174
218
502
859
481
1064
1810
1.00
1.00
1.00
1.50
1.50
1.50
1.50
1.50
1.50
2.00
2.00
2.00
2.50
2.50
2.50
3.00
3.00
3.00
3.00
3.00
3.00
3.00
2.10
2.10
2.10
2.50
2.50
2.50
5.00
5.00
5.00
Arrangement for optimum effect
DO NOT Load in tension
Calculation for the Natural Frequency loaded in compression or shear:
For ISOLATORS RM in Natural Rubber NR
fn (Hz) = 15.76
K (N/mm)
Load (N)
For ISOLATORS RM in Nitrile Rubber NBR
fn (Hz) = 24.27
K (N/mm)
Load (N)
Fig 9.2
9
Form E
www.farrat.com
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
M
t
Order Example: RE02020N6, RE02020NB6 (NBR)
H
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
D
Fig 10.1
Form E, Natural Rubber (NR)
Screw
D
H
Farrat Code
mm
RE01010
RE01515
RE02015
RE02020
RE02025
RE03015
RE03030
RE05021
RE07525
RE10040
10
15
20
20
20
30
30
50
75
100
N6
N6
N6
N6
N6
N6
N6
N6
N6
N6
mm
M
Thread
mm
t
Depth
mm
Stock
10
15
15
20
25
15
30
21
25
40
4
4
6
6
6
8
8
10
12
16
4
4
6
6
6
8
8
10
12
16
3
3
3
2
3
2
2
2
3
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
60
60
60
60
60
60
60
60
60
60
Form DS
Max.
Load
N
Vert.
Spring
Rate
N/mm
Defl.
at Max.
Load
mm
55
110
250
206
188
211
422
2790
1255
4255
55
73
167
103
75
141
141
1329
502
1064
1.00
1.50
1.50
2.00
2.50
1.50
3.00
2.10
2.50
4.00
www.farrat.com
M
L
H
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
Order Example: RDS02017N6
* CR (Neoprene) and NBR (Nitrile) versions
available on request.
D
Fig 13.1
Form DS Natural Rubber (NR)
Farrat Code
RDS02518 N6
RDS04028 N6
RDS05028 N6
10
.
D
H
mm
mm
25
40
50
18.5
28.5
28
Screw
M
L
Thread
mm
mm
6
8
10
18
23
33
Stock
3
3
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
60
60
60
Max.
Load
N
Vert.
Spring
Load
N/mm
Defl.
at Max.
Load
mm
206
754
3720
103
269
1329
2.00
2.80
2.80
Form CT
www.farrat.com
CT mounts are designed for shear and light tensile loads only. Do not use in compression
D
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
t
H
Order Example: RCT05030N6
Fig 11.1
M
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
Form CT, Natural Rubber (NR)
Screw
D
H
Farrat code
mm
RCT03020
RCT04048
RCT05030
RCT07540
RCT10055
30
40
50
75
100
N6
N6
N6
N6
N6
mm
M
Thread
mm
t
Depth
mm
Stock
20
48
30
40
55
8
8
10
12
16
8
8
10
12
16
3
3
3
3
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
NR
NR
60
60
60
60
60
Form KE
www.farrat.com
KE mounts are designed primarily for use as bump stops
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
D
H
Order Example: RKE08060N6
t
M
Fig 11.2
* CR (Neoprene) and NBR (Nitrile)
versions available on request..
Form KE, Natural Rubber (NR)
Screw
D
H
mm
M
Thread
mm
t
Depth
mm
Farrat Code
mm
RKE05035 N6
RKE08060 N6
RKE12590 N6
50
80
125
Stock
35
60
90
10
12
16
10
12
16
3
3
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
60
60
60
Max.
Load
N
Vert.
Spring
Rate
N/mm
Defl.
at Max.
Load
mm
942
3474
9574
269
579
1064
3.50
6.00
9.00
11
Form AT
www.farrat.com
AT Mounts are used in a variety of anti-vibration applications. Due to their large bonded surface, relative to the rubber centre diameter,
these mounts can be used in both shear and light tensile loadings. Never use with compression loads
D
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
L
H
Order Example: RAT05030N6
L
M
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
Fig 12.1
Form CT, Natural Rubber (NR)
D
H
Farrat Code
mm
mm
RAT 02015
RAT 03020
RAT 04048
RAT 05030
RAT 07540
RAT 10055
20
30
40
50
75
100
15
20
48
30
40
55
N6
N6
N6
N6
N6
N6
Screw
M
L
Thread
Depth
mm
mm
6
8
8
10
12
16
18
20
23
33
37
45
Stock
3
3
3
3
3
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
NR
NR
NR
60
60
60
60
60
60
Form KP
www.farrat.com
KP buffers have a distinctive form that has a progressive buffering characteristic. These buffers are used to limit vibration, deflections,
impact and shock. Two or more buffers can be used in parallel to prevent overloading in high load applications.
D
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
H
Order Example: RKP07589N6
L
* CR (Neoprene) and NBR (Nitrile)
versions available on request.
M
Fig 12.2
Form KP, Natural Rubber (NR)
12
D
H
Farrat Code
mm
mm
RKP02024 N6
RKP03036 N6
RKP05058 N6
RKP07589 N6
RKP115136N6
20
30
50
75
115
24
36
58
89
136
Screw
M
L
Thread
Length
mm
mm
6
8
10
12
16
18
20
28
37
43
Stock
3
3
3
3
3
Rubber
Hardness
Grade
Ihrd Sh.A
NR
NR
NR
NR
NR
60
60
60
60
60
Max.
Rate
N
Vert.
Spring
Rate
N/mm
Defl.
at Max.
Load
mm
420
1200
3300
7000
13000
35
67
94
156
186
12.00
18.00
35.00
45.00
70.00
RMR Rubber Metal Rails
www.farrat.com
RMR Rubber metal rails are used in a variety of anti-vibration applications in the machine, building, general engineering, and
automotive industries. They are intended to protect sensitive machinery and equipment from unwanted shock and vibration.
They also allow relative movement thereby reducing forces and tensions. Typical applications include mounting of heavy units,
motors, hoists, lifts and conveyor systems.
RMR Range includes;
A type - Top and bottom steel plate edges are flush with the rubber edge.
B type - Top and bottom steel plate widths is greater than rubber width.
C type - Bottom steel plate is rubber free at each end and longer than top plate.
D type - Single steel lenght is longer than rubber length and rubber free at each end.
F type - Single bottom steel plate edge is flush with rubber.
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
W
Order Example: RMR 04035 A
H
s
Fig 13.1, RMR type A
Fig 13.2, RMR type B
Fig 13.3, RMR type C
RMR Rubber metal rails (Standard type other size on request)
W
H
L
Farrat Code
mm
mm
mm
s
mm
Stock
RMR 04035 *
40
35
2000
10
3
RMR
RMR
RMR
RMR
RMR
05035 *
05040 *
05045 *
05050 *
05070 *
50
50
50
50
50
35
40
45
50
70
2000
2000
2000
2000
2000
10
10
10
10
10
3
3
3
3
3
RMR
RMR
RMR
RMR
07050 *
07060 *
08045 *
08080 *
70
70
80
80
50
60
45
80
2000
2000
2000
2000
10
10
10
10
3
3
3
3
RMR 10060 *
RMR 10080 *
100
100
60
80
2000
2000
15
15
3
3
RMR 12045 *
RMR 12060 *
120
120
45
60
2000
2000
15
15
3
3
RMR 15060 *
RMR 15080 *
150
150
60
80
2000
2000
15
15
3
3
* Specify A, B, C, D, or F
Standard Rubber NR IRHD 60, other grades and sizes available on request.
Fig 13.4, RMR type D
Fig 13.5, RMR type F
13
RTS
www.farrat.com
The RTS element is designed to be used as elastic vibration isolator. RTS Mounts can be used on their own or two mounts can be
stacked to increase the isolation efficiency. All mounts are supplied with a load spreading top plate. When installed the mount
traps a pocket of air between the mount and the supporting surface. This gives a highly elastic support that is capable of achieving
very low natural frequencies.
D
M
H
s
L
CF
W
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
All metal parts bright zinc plated mild steel
d
Fig 14.1
Order Example: RTS060N6
Bolt through add suffix BT
Order Example: RTS060NBT8
RTS, Natural Rubber (NR)
D
Farrat Code
RTS 040
RTS 040
RTS 060
RTS 060
RTS 060
RTS 080
RTS 080
RTS 080
RTS 100
RTS 100
RTS 100
RTS 150
RTS 150
RTS 150
RTS 200
RTS 200
RTS 200
N4
N6
N4
N6
N7
N4
N6
N7
N4
N6
N7
N4
N6
N7
N4
N6
N7
CF
L
d
H
M
Hole
Base
Hole
Height
Diam. Centres Length diam. Unloaded Thread
mm
mm
mm
mm
mm
mm
40
40
60
60
60
80
80
80
100
100
100
150
150
150
200
200
200
52
52
76
76
76
100
100
100
124
124
124
182
182
182
240
240
240
64
64
64
90
90
120
120
120
148
148
148
214
214
214
280
280
280
6.2
6.2
6.2
6.2
6.2
8.2
8.2
8.2
10.2
10.2
10.2
12.2
12.2
12.2
14.5
14.5
14.5
All metal parts bright zinc plated mild steel
Fig 14.2
14
20
20
24
24
24
27
27
27
28
28
28
39
39
39
44
44
44
M6
M6
M6
M6
M6
M8
M8
M8
M10
M10
M10
M14
M14
M14
M18
M18
M18
Thread
depth
mm
S
Plate
Thick
mm
Stock
6
6
6
6
6
8
8
8
10
10
10
14
14
14
18
18
18
2
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
1
1
1
1
3
1
1
3
1
1
3
1
1
3
1
1
3
Vert.
Defl.
Rubber
Max. Spring at Max.
Hardness Load Rate
Load
Grade Ihrd Sh.A
N
N/mm
mm
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
45
60
45
60
75
45
60
75
45
60
75
45
60
75
45
60
75
60
75
180
250
400
480
800
1100
750
1500
2080
1420
2300
3640
5000
7400
12000
20
30
60
83
160
96
200
367
188
375
520
200
354
639
714
1104
2182
3.00
2.50
3.00
3.00
2.50
5.00
4.00
3.00
4.00
4.00
4.00
7.10
6.50
5.70
7.00
6.70
5.50
RPA, RPC & RPE
www.farrat.com
RP isolators provide facility to bolt onto supported equipment and if required the support surface.
Applications include: pump sets, generators, HVAC and other passive and active applications.
Stock Availability: Subject to quotation
Order Examples:
RPA15020N60
RPC15020N60
RPE15020N60
RPA
RPE
RPC
D
M
D
D
Ls
M
P
P
P
H
H
H
s
s
s
L
CF
L
CF
L
CF
f
f
f
W
W
W
G
G
G
Fig 15.2
Fig 15.1
Fig 15.3
RP Natural Rubber (NR)
Type For
Size
RP*
RP*
RP*
RP*
RP*
08012
08020
10012
10020
15020
RPA/C
M
RPA
Ls
M12x1.75
M20x2.5
M12x1.75
M20x2.5
M20x2.5
37
37
37
37
35
D
Base
thickness
s
Width
f
Fixing holes
Length
g
Centres
CF
80
80
100
100
150
3
3
5
5
5
12
12
17
17
20
20
20
-
106
106
140
140
200
Dimensions mm
L
W
H
130
130
150
150
240
80
80
110
110
170
50
50
80
80
80
RP* Load capacities and characteristics
Vertical
Farrat Code
RP* 080**N35
RP* 080**N35P
RP* 080**N70
RP* 080**N50P
RP* 080**N60P
RP* 100**N70
RP* 15020N70
Rubber
Grade
Hardness
Ihrd Sh.A
Damping
C/Cc
Spring
constant
kN/mm
NR
NR
NR
NR
NR
NR
NR
35
35
70
50
60
70
70
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.2
0.4
0.6
0.8
1.0
1.0
2.33
Max.
Load
kN
Deflection
at Max.
Load
mm
1.00
2.00
3.00
4.00
5.00
6.00
14.00
5.00
5.00
5.00
5.00
5.00
6.00
6.00
* RP Mounts with Neoprene Rubber (CR) available on request
Order Example: RPA15020CR50
P: Steeel reinforcing plate,
applicable to codes with suffix P
Metal parts Sherardised steel, bright zinc
plated threaded parts.
Stainless steel on request.
15
REM with rebound control
www.farrat.com
REM equipment and machine vibration isolation mounts with rebound control
Applications include: compressors, gensets, motors, pumps and other rotating machinery, electronic,
hydraulic equipment, scientific and other equipment.
D1
D2
M
Stock Availability
(subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
H
s
F
Order Example:
REM 0601045
L
CF
W
G
Fig 16.1
REM, Natural Rubber (NR)
D1
D2
Cover Cover
Top
W
H
M
Thread
G
F
CF
S
Slot
Slot
Fixing
Width Length Centres
Farrat Code
mm
mm
mm
mm
mm
mm
mm
mm
REM 0601045
REM 0601060
REM 0601245
REM 0601260
REM 0621245
REM 0621260
REM 0771045
REM 0771060
REM 0921245
REM 0921260
REM 0931045
REM 0931060
REM 1061245
REM 1061260
REM 1061645
REM 1061660
REM 1061670
REM 1081645
REM 1081660
REM 1081670
REM 1211645
REM 1211660
REM 1441645
REM 1441660
60
60
60
60
60
60
77
77
92
92
93
93
106
106
106
106
106
108
108
108
121
121
144
144
38
38
38
38
50
50
59
59
73.5
73.5
70
70
81
81
81
81
81
83
83
83
92
92
121
121
106
106
106
106
106
106
128
128
128
128
144
144
172
172
172
172
172
190
190
190
188
188
216
216
60
60
60
60
60
60
77
77
92
92
93
93
106
106
106
106
106
108
108
108
121
121
144
144
35
35
35
35
31
31
30
30
45
45
35
35
38
38
38
38
38
50
50
50
42
42
48
48
M10x1.5
M10x1.5
M12x1.75
M12x1.75
M12x1.5
M12x1.5
M10x1.5
M10x1.5
M12x1.75
M12x1.75
M10x1.5
M10x1.5
M12x1.75
M12x1.75
M16x2
M16x2
M16x2
M16x2
M16x2
M16x2
M16x2
M16x2
M16x2
M16x2
8.3
8.3
8.3
8.3
8.3
8.3
9
9
10.5
10.5
10
10
14
14
14
14
14
16.5
16.5
16.5
14
14
14
14
16
16
16
16
16
16
9
9
10.5
10.5
10
10
18
18
18
18
18
16.5
16.5
16.5
14
14
18
18
Previous code prefix: CCF
16
L
Base
Base Height
Length Width
Rubber
Hardness
mm Grade Ihrd Sh.A
75-90
75-90
75-90
75-90
75-90
75-90
110
110
110
110
124
124
138-146
138-146
138-146
138-146
138-146
160
160
160
158
158
186
186
2
2
2
2
3
3
2
2
3
3
2.5
2.5
3
3
3
3
3
5
5
5
3
3
4
4
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
45
60
45
60
45
60
45
60
45
60
45
60
45
60
45
60
70
45
60
70
45
60
45
60
Max.
Load
Vert.
Defl.
Spring at Max.
Rate
Load
N
N/mm
mm
Stock
950
1700
950
1700
1600
3000
1200
2800
3500
6000
1800
4000
2750
5100
2750
5100
10000
4000
8500
14000
4250
6800
8000
14000
297
567
297
567
533
1111
387
933
921
1818
581
1333
809
1759
809
1759
3448
1212
2833
5385
1063
1943
1000
1944
3.20
3.00
3.20
3.00
3.00
2.70
3.10
3.00
3.80
3.30
3.10
3.00
3.40
2.90
3.40
2.90
2.90
3.30
3.00
2.60
4.00
3.50
8.00
7.20
2
2
2
2
2
2
3
2
2
2
2
2
2
3
2
2
2
3
2
2
2
2
2
3
All metal parts bright zinc plated mild steel
Isomounts
aa
www.farrat.com
Mounts for levelling, shock and vibration absorption
a
Isomounts provide an efficient and economic method of installation of a
wide range of machinery and equipment. Machines can be installed and
accurately levelled without bolting down or grouting. Machine
performance is improved through effective shock and vibration
isolation and damping.
Typical applications include:
•
•
•
•
•
•
•
•
•
Compressors and Pump Sets
Diecasting machines
Diesel Generators
Hydraulic Power Packs
Injection Moulding Machines
Packaging Machinery
Presses: Forging, Hydraulic and Mechanical
Rubber Machinery
Testing Machines
Dimensions, Capacities and Characteristics
Isomount
Unit
0-70
1-80
2-80
3-80
3 HM-80
35-80
4-80
5-80
Diameter D1
mm
50
78
120
160
160
200
228
320
Diameter D2
mm
36
60
100
135
140
170
200
300
Height, Min.. H1
mm
21
32
55
40
55
55
55
70
Height, Max H2
mm
30
44
70
55
75
75
75
100
Vertical Adjust
-
9
12
15
16
20
20
20
30
Screw Thread
H or SH
M12x1.25
M20x1.50
M20x1.50
M24x1.50 M24x1.50
M30x1.5
Alternative Thread
H or SH
-
M12x1.75
M16x1.5
M16x1.5
M16x1.5
M20x1.50 M20x1.50
M24x1.50
H
-
-
M16x2
-
-
-
-
M30x2
Standard Rubber
IRHD A
-70
-80
-80
-80
-80
-80
-80
-80
Spring Constant
Standard
Vertical
kN / mm
1.2
3.3
7
9
17
21
26
55
Horizontal
kN / mm
0.4
1.2
2.5
3
6
7
10
20
C / Cc
0.09
0.09
0.09
0.09
0.09
0.09
0.09
0.09
daN
150
500
1200
2500
3000
4000
5000
12000
kg
0.25
0.5
1.5
2.5
2.6
3.9
6.4
19.1
Damping Factor
Maximum Load/Mount
Mass without screw
M10x1.50 M10x1.50
1 daN = 1 kg
M24 x 1.5
130 H
150 H
180 H
250 H
36 A/F
M30 x 2.0
200 H
46 A/F
M24 x 1.5
170 SH
19 A/F
M30 x 1.5
170 SH
24 A/F
H
H1
H2
a
M10 x 1.5
M12 x 1.75 M16 x 2
M20 x 1.5
60 H
80 H
70 H
100 H
80 H
100 H
100 H
120 H
150 H
150 H
180 H
250 H
17 A/F
19 A/F
24 A/F
30 A/F
SH = Hexagon Head stud, zinc plated
M12 x 1.25 M16 x 1.5 M20 x 1.5
120 SH
120 SH
170 SH
Spanner
9 A/F
12 A/F
15 A/F
Fig 17.02
Fig 17.01
Adjusting Screws Size x Lengths available
H = Hexagon Head, screw zinc plated
D2
D1
SH
D2
D1
Order examples:
ISO-5-80 + M30 x 2 x 200H
Steel cover normal finish: Bright zinc plated
17
RMF with rebound control
www.farrat.com
RMF equipment and machine vibration isolation mounts with rebound control.
Applications include: compressors, gensets, motors, pumps and other rotating machinery,
electronic, hydraulic equipment, scientific and other equipment
L
D1
D2
M
W
H
s
d
Fig 18.1
CF
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
Fig 18.2
Order Example: RMF15045
Farrat Code
RMF
RMF
RMF
RMF
RMF
RMF
RMF
RMF
RMF
RMF
RMF
RMF
RMF
RMF
06545
06560
09445
09460
11045
11060
15045
15060
15070
16245
16260
17545
17560
17570
D1
D2
L
W
H
Cover Cover Base
Base Height
dia.
Top Length Width
mm
mm
mm
mm
mm
65
65
94
94
110
110
150
150
150
162
162
175
175
175
48
48
70
70
82
82
110
110
110
120
120
125
125
125
73
73
98
98
115
115
168
168
168
170
170
184
184
184
73
73
98
98
115
115
168
168
168
170
170
184
184
184
All metal parts bright zinc plated mild steel
18
30
30
45
45
39
39
51.5
51.5
51.5
60
60
63
63
63
M
Thread
Size
mm
M10x1.5
M10x1.5
M12x1.75
M12x1.75
M12x1.75
M12x1.75
M16x2
M16x2
M16x2
M16x2
M16x2
M20x2.5
M20x2.5
M20x2.5
Vertical Z
d
CF
S
Defl.
Fixing Fixing
Rubber Max. Spring at max.
hole Centres
Hardness Load Rate Load
mm
mm
mm Ihrd Sh.A kN N/mm N/mm Stock
8.2
8.2
10.2
10.2
12.4
12.4
12.5
12.5
12.5
16.2
16.2
13
13
13
55
55
80
80
100
100
132
132
132
145
145
150
150
150
3
3
3
3
3
3
4
4
4
4
4
4.5
4.5
4.5
45
60
45
60
45
60
45
60
70
45
60
45
60
70
0.50
1.10
1.40
3.00
1.80
4.50
6.00
8.40
11.00
5.50
9.00
15.00
25.00
35.00
125
275
350
750
450
1125
1200
1680
2200
1100
1800
3000
5000
7000
4
4
4
4
4
4
5
5
5
5
5
5
5
5
3
3
3
3
3
3
3
3
3
3
3
3
3
3
RMA with rebound control
www.farrat.com
RMA equipment and machine vibration isolation mounts with rebound control
Applications include: compressors, engines, gensets, motors, pumps and other rotating machinery, electronic, hydraulic equipment,
scientific and other equipment. Particularly suited to marine applications.
L1
L2
M
H
s
L3
CF
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
G
W
F
Order Example: RMA1041645
Fig 19.1
RMA Natural Rubber (NR)
Farrat code
RMA
RMA
RMA
RMA
RMA
RMA
RMA
RMA
RMA
0801245
0801260
0801270
1041645
1041660
1041670
1302045
1302060
1302070
L1
L2
L3
W
H
Cover Cover Base Base
Bottom Top Length Width Height
mm
mm
mm
mm
mm
80
80
80
104
104
104
130
130
130
60
60
60
75
75
75
112
112
112
120
120
120
183
183
183
230
230
230
60
60
60
75
75
75
112
112
112
40
40
40
50
50
50
70
70
70
M
Slot
Thread
mm
F
mm
G
mm
M12x1.75
M12x1.75
M12x1.75
M16x2
M16x2
M16x2
M20x2.5
M20x2.5
M20x2.5
11
11
11
13
13
13
18
18
18
14
14
14
20
20
20
26
26
26
CF
S
Fixing
Rubber Max.
Centres
Hardness Load
mm
mm Ihrd Sh.A N
100
100
100
140
140
140
182
182
182
3
3
3
4
4
4
5
5
5
45
60
70
45
60
70
45
60
70
360
640
960
1200
1900
3000
3300
5400
8100
Vert. Defl.
Spring at Max.
Rate Load
N/mm mm Stock
90
160
240
240
380
600
550
900
1350
4.00
4.00
4.00
5.00
5.00
5.00
6.00
6.00
6.00
3
2
3
2
2
2
2
2
3
All metal parts bright zinc plated mild steel
Stainless steel on request
19
REF Elastic Fixing Inserts
www.farrat.com
D1
d
g
t
L1 L2
L3
M
D2
Fig 20.3
Fig 20.2
Fig 20.1
REF Elastic Fixing Inserts are used for the protection of light to medium weight equipment against active or passive vibration and
structure–borne noise. They are manufactured from CR Neoprene (70 shore) which can operate in temperature ranges of -30 to +800 C.
Main forms of use are as mounts, anchors, bushings or in "blind hole" arrangements.
Applications include: computers, electronic equipment light to medium weight machinery etc.
REF
Farrat Code
D1
D2
REF 09M3
REF 12M4
REF 15M5
REF 16M6
REF 24M8
9
12
15
16
24
7.2
9.3
10.2
12.7
16.5
Characteristics
Dimensions mm
d
M
L1
3.3
4.5
6
8
10
M3
M4
M5
M6
M8
Clearance Hole Dia.
Farrat Code
Min.
mm
Max.
mm
REF09M3
REF12M4
REF15M5
REF16M6
REF24M8
7.2
9.3
10.2
12.7
16.5
7.5
9.6
10.5
13
16.8
AW, AWS
11.5
14.5
18
21
27
REF
L2
L3
g
8
10
12
13
17
9
11.5
14.5
17
22
2.5
3
3.5
4
5
0.6
1
1
2
2
50
66
83
100
280
H2
25
33
42
50
140
Tightening Torque
Plate
Min.
Max.
Nm
Nm
2.5
3
4
5
6.5
0.3
0.4
0.6
0.7
1.6
Blind Hole
Comp. & Shear
N
10
13
16
20
50
Tightening Torque
Blind hole
Min.
Max.
Nm
Mmm
0.4
0.6
0.8
0.9
1.8
0.4
1
1.7
2.5
3
0.5
1.5
2.5
3.5
4
www.farrat.com
AWS Anti vibration Washers, Square
AW D1 D2 H1 H2
D2
Fig 20.4
09M3
12M4
15M5
16M6
24M8
Anti vibration Washers
D1
SG 6P2
REF
REF
REF
REF
REF
Plate thickness
t
Min.
Max.
mm
mm
AW Anti vibration Washers, Round
H1
Farrat Code
Maximum Static Loads
Compression
Shear
N
N
T
F
AWS
L
D2 H1 H2 T
F
AW 10 30
11
11
5
7
4
AWS 30 80
31 21
6 190 34
AW 12 30
13
11
5 13
6
AWS 36 90
37 21
6 280 42
AW 14 35
15 12
6 20
8
AWS 42 100 43 25
10 390 50
AW 16 40
17 12
6 30
10
AWS 48 110 49 25
10 540 60
AW 20 40
21 12
6 60
13
AWS 56 125 57 25
10 840 80
AW 24 50
25 14
8 90
18
AW 30 60
31 14
8 140 24
AW 36 70
37 16 10 230 33
L
D1
L
Dimensions: mm
T = Max tightening torque Nm
H1
H2
SG 15 P2
F = Corresponding bolt tension kN
Fig 20.5
Farrat AW - AWS anti vibration washers reduce vibration transmitted to or from holding down bolts. AW - AWS washers are placed between
the hold down nut and machine base or flange. AWS for high bolt load applications.
Tightening torques 'T' relate to dry, unplated, metric coarse threads. If higher tightening torques (T) are required, consult Farrat for advice.
AV Material - AW=SG 6P2
AWS=SG 15 P2
20
aa
a
a
AWR
www.farrat.com
Isowasher flat rubber metal anti vibration washers.
s
D2
H
aa
D1
Isowasher AWR
Farrat Code
AWR
AWR
AWR
AWR
AWR
AWR
Rubber
Ihrd Sh.A
D1
80
80
80
80
80
80
30
40
50
50
60
65
10
12
14
16
20
24
Dimensions mm
D2
H
10.5
12.5
14.5
16.5
20.5
24.5
AWRP
17
17
20
20
25
26
2
2
2
2
3
3
www.farrat.com
Isowasher flat rubber metal anti vibration washers with spigot.
D2
D3
h
H2 H1
s
D1
Isowasher AWRP
Farrat Code
AWRP
AWRP
AWRP
AWRP
AWRP
AWRP
t
10
12
14
16
20
24
Rubber
Ihrd Sh.A
D1
D2
D3
Dimensions mm
H1
H2
h
S
80
80
80
80
80
80
30
40
50
50
60
65
10.5
12.5
14.5
16.5
20.5
24.5
14
16
18
20
24.5
29.5
14
14
16
16
21
21
17
17
19
20
25
26
3
3
3
4
4
5
2
2
2
2
3
3
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
Order Examples: AWR 16
AWRP 16
AWR and AWRP
Characteristics
Farrat Code
AWR/P 10
AWR/P 12
AWR/P 14
AWR/P 16
AWR/P 20
AWR/P 24
Spring
constant
kN/mm
Max.
Load
kN
Deflection
at Max. load
mm
Max.
Torque
Nm
Stock
1.25
2.40
2.70
3.00
3.60
3.90
1.90
3.60
4.90
5.40
8.50
9.00
1.5
1.5
1.8
1.8
2.3
2.3
3
8
12
16
37
44
3
3
3
3
3
3
21
RU Mount
Fig 22.1
www.farrat.com
Application
RU Mounts are intended to protect sensitive
machinery from shock and vibration. They are used
in a variety of applications in the machine building
and general engineering sectors.
A
Fig 22.2
H3
B
H1
H2
W
s
C
Due to their design, they allow relative loadings and
movement in three directions, thereby reducing forces
and tensions. The information given below is based
on a ‘compressive’ vertical load.
L
A
RU
Vertical Load capacities
Max.
Defl. at
Vertical
Load Max. load Spring rate
N
mm
N/mm
Stock
Rubber
NR
Ihrd Sh.A
L
W
H1
Dimensions mm
H2
H3
A
B
C
A
RU6145
RU6160
RU6170
45
60
70
61
61
61
20
20
20
43
43
43
27
27
27
25
25
25
6.6
6.6
6.6
20.4
20.4
20.4
10
10
10
Hole
Hole
Hole
120
150
160
6.1
5.6
4.3
20
27
37
3
3
3
RU7145
RU7160
RU7170
45
60
70
71
71
71
25
25
25
62
62
62
43
43
43
38
38
38
11
11
11
25
26.4
26.4
12.5
12.5
12.5
Slot
Slot
Slot
220
300
300
7
5.2
3.3
31
60
95
3
3
3
RU7945
RU7960
RU7970
45
60
70
79
79
79
50
50
50
78
78
78
56
56
56
50
50
50
13.6
13.6
13.6
30
32.4
32.4
25
25
25
Slot
Slot
Slot
550
850
980
7
4.2
3
120
205
325
3
3
3
RU8745
RU8760
RU8770
45
60
70
86
86
86
64
64
64
108
108
108
82
82
82
76
76
76
16
16
16
38
38
38
32.5
32.5
32.5
Slot
Slot
Slot
2000
2000
2000
7
3.5
2.8
285
570
715
3
3
3
Farrat Code
RO Mount
www.farrat.com
RO mounts provide for a large deflection under load compared to solid rubber mounts for applications with relatively low disturbing
frequencies (down to 12.5Hz) or for shock protection for delicate instruments. By virtue of the design, the deflection for given loads is
different is each of the primary axes. The mount is designed for use in compression, shear, torsion or any combination. It is not designed
for tensile loading.
Applications include: slow speed fans, pumps, reciprocating mechanisms or shock protection for delicate instruments.
RO
Farrat Code
Rubber
Ihrd Sh.A
D
H
ROM 1260
ROM 1760
ROM 2560
ROM 3660
60
60
60
60
12.5
17
25
36
12.5
14
30
40
NR
Farrat Code
ROM 1260
ROM 1760
ROM 2560
ROM 3660
Rubber
Load
Ihrd Sh.A
60
60
60
60
Max.
Load
N
20
25
40
160
Dimensions mm
B
d
G
h
R
9.5
13
20
26
10
10
14
20
5.25
7
7
7
M4
M4
M5
M10
Vertical Load Capacities
Defl. at
Spring
Rate
Rate
mm
N/mm
Stock
4
4
3
5
5
3
12
3
3
14
11
3
All metal parts bright zinc plated mild steel
Stainless steel on request
22
5.6
6
12
17
B
G
h
H
d
R
h
Fig 22.3
Fig 22.4
D
STC
www.farrat.com
Fig 23.2
Fig 23.1
D1
H2
D3
H
s
D2
Hole C
STC
Rubber NR
Farrat Code Irhd Sh.A
D1
D2
Dimensions mm
D3
H1
STC
STC
STC
STC
STC
STC
STC
STC
STC
STC
28
28
45
45
50
50
64
64
95
95
20.6
20.6
31.5
31.5
34.3
34.3
41.1
41.1
60
60
10
10
13
13
13
13
16
16
20
20
2845
2860
4445
4445
5060
5075
6360
6375
9560
9575
45
60
45
60
60
75
60
75
60
75
Old
Code
Farrat Code
STC
STC
STC
STC
STC
STC
STC
STC
STC
STC
2845
2860
4445
4460
5060
5075
6360
6375
9560
9575
539887-45
539887-60
539190-45
539190-60
538886-60
538886-75
539191-60
539191-75
-
Load capacities
Rubber
Max.
Defl. At
NR
Load
Max. Load
Irhd Sh.A
N
mm
45
60
45
60
60
75
60
75
60
75
350
500
750
1000
1500
3300
2500
5000
5000
10000
0.7
0.7
1.2
1.2
1.2
1.2
2
2
4
4
STC is a vibration, shock and noise isolator which has been
designed for the secure support of equipment installed in
any direction.
Especially suitable for rugged applications, these isolators are
used for the cabins and engines of off-road and agricultural vehicles, for motors, power packs and electrical equipment etc.
17.5
17.5
25.4
25.4
35
35
45
45
60
60
s
H2
Hole C
8
8
10
10
16
16
19
19
23
23
5.6
5.6
10.4
10.4
13.5
13.5
15.7
15.7
25
25
21
21
32
32
35
35
42
42
57
57
Spring
Rate
N/mm
Stock
500
715
625
833
1250
2750
1250
2500
1250
2500
1
2
1
1
1
1
1
1
1
3
Stock Availability (subject to change)
1) Generally ex stock
2) 2-3 days
3) Subject to quotation
Order Example: STC 5060
Installation is very simple. The STC is fitted to a supporting frame
or chassis by inserting it into a hole having rounded edges and a
smooth bore. The fixing screw is passed through the
equipment foot and top washer, through the steel tube and then
tightened onto the lower washer with a nut.
Farrat reserve the right to alter a specification if it is in the
interest of product improvement.
Manufactured as a one piece cylindrical Natural Rubber NR
moulding for maximum resilience and isolation performance, the
STC has a centrally bonded thick wall steel tube
Generally the top steel washer, lower rebound steel washer and
equipment fixing screw are not supplied by Farrat, except against
special orders.
23
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MF Mounts (MF)
Pressed Steel Mount fitted with Nitrile
Rubber Pad for lighter applications.
MF P: Zinc Plated Steel,
MF S: Stainless Steel 304. Catalogue 1.06
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Squaregrip (SG)
High strength vibration damping material
for machinery and equipment needing a stiff
vibration damped support with minimum
machine movement. Catalogues 1.06, 6.07
NBR
An elastic vibration isolation material
with good shock and vibration isolation
properties. Catalogues 1.06, 6.07
Levelling Mount (LF)
High precision stainless steel (304)
levelling mounts with captive ball
nosed levelling screws. Catalogue 1.06
Vidam (VM)
General Purpose, rubber/cork based machine
mounting material. Catalogues 1.06, 6.07
Isomounts (ISO)
Machine mount with vulcanized
rubber base and built in levelling screws
for height adjustment. Catalogue 1.06
Isomat (IM)
High performance shock and vibration isolation
material. Unique design provides increased
elasticity and improved isolation efficiency.
Catalogues 1.06, 6.07
Isobloc (ISB)
High load capacity machine mount
with vulcanized rubber base and built in
levelling screws for height adjustment.
Catalogue 1.06
Hamamat (HM)
High impact, high strength and high
stiffness shock and vibration absorbing material.
Catalogue 6.07
Wedge Levelling Elements (WLE)
Precision Wedge Levelling units for rigid
machine support. Catalogue 1.06
Corner / Side Foot (CF, SF)
General purpose machine mounting pads.
Catalogue 1.06
Wedgemounts
(WL, WLF, WLB, WLT)
Height adjustable machine mounts based on
screw driven three part machined cast iron
wedges fitted with various types of vibration
damping material. Catalogue 1.06
a
Anti vibration Washers
(AW, AWS, AWR, AWRP)
To reduce vibration transmitted to, or from,
holding down bolts. Catalogues 1.06, 7.07
Air Mount (SLM)
Low profile, low frequency air spring suitable for
both passive and dynamic applications where a
support natural frequency of 3 - 5 Hz is required.
Catalogue 3.07
Rubber to Metal Bobbins (RM)
Versatile rubber-to-metal bonded
vibration and shock isolators, available in
a broad range of fixing configurations.
Catalogue 7.07
Equipment Mounts
(RTS, RPA, REM, RMF, RMA)
All purpose vibration & shock isolators
for the support of dynamic and rotating
machinery. Catalogue 7.07
Jackmounts
(JCM, JRM, JSM, JMS)
General purpose machine mounts.
Different anti vibration versions depending
on applications. Catalogue 1.06
Spring Mounts (SM)
Low frequency anti-vibration mountings with
damping control and adjustable levelling for
efficient isolation of active and passive machinery.
Catalogue 2.07
Captive Jackmounts (JMP, JMSP)
Machine mount with captive pendulum
levelling screw. Cast iron and stainless
steel versions. Catalogue 1.06
Isolated Foundations (IF)
Shock and vibration isolation for
machine foundations and structures.
Catalogue 4.07
Farrat Isolevel Ltd.
Balmoral Road, Altrincham, Cheshire WA15 8HJ. England GB
Tel: +44 (0) 161 924 1600 Fax: +44 (0) 161 924 1616
email: sales@farrat.com www.farrat.com
Information in this brochure is for guidance only and in the interests of product development may change