For Pricing and Days to Ship,Please Configure Online.
Lock Washers (Nord-Lock®) / Tab Washers / Disc Spring Washers
U-Nuts® / Double Locking Nuts
Hard Lock Nuts®
Part Number
7
7.6
9
10.8
13.5
16.6
19.5
d
t
3.4
4.4
2.2
5.4
6.5
8.7
10.7 2.0
13
Unit Price Volume Discount Rate
1~9 pc(s).
QU-Nuts®
is not RoHS compliant.
E
(M6 or Less)
(M8 or More)
S
S
Configure Online
QPrinciple of Lock Washers
Counterbore dia. does not need to
be increased.
A pair of washers with wedge cams on one side and radial ribs on the other side each to compose a self-locking arrangement.
Cam angle (@) is set to be larger than the thread lead angle (B).
W
hen the screw attempts to rotate loose, a force is generated by a cam member to push up and separate from the opposite
cam member. The rotation is blocked by the wedge effect and the cams will not be separate by more than one thread pitch.
(e)
NLDF3
Type
Single Item
10~199 pc(s). 200 pcs. or More
Part Number
b
Correct
Wrong
Type
N LDF can be used repeatedly with a lubricant.
QAbout Mating Materials
O n the surface of mating materials, there will be impression marks made by the radial teeth of the washers.
The hardness of the mating surfaces should not exceed the hardness of the Nord-Lock Washers.
T emperature limit for NLDF is 500°C.
Do not use in an environment when it exceeds the temperature limit.
P lease refer to the values listed below as guidelines when securing a screw with a lock washer.
There is no self-locking effect when the values are far below recommended values.
If the tightened torque exceeds the recommended values, loosening the screws may become impossible or
Nord-Lock may be broken.
8mm Standard Nut Tightened
Tightened with 50mm Tightening Length
Nylon Resin Nut
Spring Washer
Standard Nut of 8mm
8mm Standard Nut and Nord-Lock
tightened at 25% Yielding Point
10
5
100
200
300
Screw Tightening Torque and Recommended Tightening Force when Lock Washer is Used.
(Lubricant GTP600)
10
Applicable
Screw MxP
NLDF
Screw Strength Class
A2-80, A4-80 GF=0.65
µg=0.14 µw=0.14
Screw Strength Class
A2-70, A4-70 GF=0.65
µg=0.14 µw=0.14
Tightening
Torque N·m Tightening
Force kN Torque N·m Force kN
3
3x0.5
0.9
1.5
1.2
2
4
4x0.7
2
2.6
2.7
3.4
5
5x0.8
3.9
4.1
5.3
5.5
6
6x1.0
6.9
5.9
9.2
7.8
8
8x1.25
17
11
22
14
36_36PACK-NLDF
10
10x1.5
33
17
43
23
12
12x1.75
56
25
75
33
EGF: Coefficient at the Yield Point µg: Coefficient of Friction at Screw Thread µw: Coefficient of Friction in Washer
5
GTS
QSerrated Conical
Disc Spring Washers
d
b
15
400
Frequency of Vibration
PACK-ZAST
QTab Washers-One-Tabbed
Tab Washers-Two-Tabbed
Q
Released
SSRBW
QDisc Spring Washers
UNUTZ
UNUTKZ
UNUTSZ
PACKZAST
PACKZATT
3.2
4.3
5.3
6.5
8.5
10.5
12.5
17
21
25
3
4
5
6
8
10
12
16
20
24
12
14
17
18
22
26
30
38
45
52
7
9
10
13
16
20
24
30
38
44
Pitch
Unit Price Volume Discount Rate
l l1 b 1~9 pkg(s). 10 pkgs. or More
4
5
13 5
0.29
14 7
8
15
9
0.5
20 13
22 14
0.8
27 19
32 24
1.2 36 28
44 35
Part Number
Type
No.
6
7
9
10
12
15
17
GTS
3
4
5
6
8
10
12
16
20
24
D
d
H
5.5
7
8.5
10
13
16
18
24
30
36
3.2
4.25
5.25
6.4
8.4
10.6
12.6
16.9
20.9
25.4
0.6
0.7
0.85
1.25
1.55
1.90
2.20
2.80
3.55
4.25
Part Number
PACK-ZAST3
GTS10
SSRBW8
P
Friction
Ring
P'
Unit Price Volume Discount Rate
t * Less than * or More * Quantity
15000
10000
5000
6000
3000
2000
1000
500
250
150
0.45
0.5
0.6
1.0
1.2
1.5
1.8
2.3
2.8
3.5
4
5
6
8
10
12
16
0.7
0.8
1.0
1.25
1.5
1.75
2.0
Tolerance
7
8
10
13
17
19
24
Part Number
UNUTZ4
PACK-UNUT12
d
H
t
4.3
5.3
6.4
8.4
10.5
13.0
0.7
0.85
0.95
1.3
1.6
1.75
0.45
0.55
0.60
0.90
1.10
1.20
Reference
Dim.
0
-0.2
0
-0.25
0
-0.35
Type
MMaterial SSurface Treatment
1018 Carbon Steel Trivalent Chromate
HLN
HLNS 304 Stainless Steel
H
a
M
D
(e)
ELight Load
7.5
9.0
10.5
13.5
16.5
19.0
M
Qty. /1
pkg.
m
Tolerance
3.8
4.6
5.1
7.3
8.3
10.5
14.5
H1 (h)
B
l
a: Eccentricity
Unit Price Volume Discount Rate
1~49 pc(s). 50~69 70~99 100~500
EM14 and M16 are not flanged.
±0.3
±0.4
±0.5
P1
Eccentric Center of Convex Side
of the Lower Nut
Strong wedge action will take effect here.
Upper Nut
a
a
b
Configure Online
(Fig.-1)
P1
P3
Lower Nut
P2
(Fig.-2)
Tightening Torque N·m (kg·cm)
UNUT, UNUTK
2.2 (22)
4.4 (45)
7.4 (75)
18 (180)
36 (370)
62 (630)
155 (1600)
8.1
9.2
11.5
15
19.6
21.9
27.7
UNUTS
1.9 (19)
3.8 (39)
6.5 (66)
16 (160)
31 (320)
55 (560)
135 (1400)
Cautions
· At least two thread pitches should protrude from the friction ring.
1. When tightening the nut refer to the Tightening Torque Chart.
2. Use chamfered tipped screws of JIS6g (Class 2) in thread precision.
3. Use appropriate lubricant if seizure or scuffing occurs when screwing or
unscrewing the nut onto threads.
4. Cannot be screwed in from the friction ring side.
5. Discontinue use if abnormal deformation occurs in the friction ring or the clamp.
Part Number
Type
M
6
8
HLN 10
HLNS 12
(Stainless Steel)
14
16
MxPitch
B
(e)
6x1.0
8x1.25
10x1.5
12x1.75
14x2.0
16x2.0
10
13
17
19
22
24
11.5
15
19.6
21.9
25.4
27.7
1Lower Nut 2Upper Nut Pair Height
H
Tolerance H1 Tolerance l Tolerance
0
±0.3
5
5
8
-0.3
6.5
6.5
10.6
0
0
8
8
13.2
-0.58
-0.58
10
9.3
16
11
11
18.5
0
0
-0.7
-0.7
13
13
22.5
(h)
3
4.1
5.2
7.0
7.5
9.5
Weight per Unit Price
Set (g)
HLN HLNS
4
8.9
18
26
39
52.8
QTightening Torque Chart (Reference Value)
1Lower Nut
2Upper Nut
By Material: Tightening Torque Reference Value Chart (N · m)
All Materials
M
1018 Carbon Steel or Equivalent 1045 Carbon Steel or Equivalent 4137 Alloy Steel or Equivalent 304 Stainless Steel/316 Stainless Steel or Equivalent Tightening Torque
(N·m)
4.8(320N/mm2) 8.8(640N/mm2) 10.9(900N/mm2) 50(210N/mm2) 70(450N/mm2)
6
2.3~6
1.5~4
3.3~9
4~5
8
5.6~15
11.2~30
15.8~42
3.7~10
7.9~21
9~13
10
11~30
22~59
31~84
7~20
16~42
18~24
12
19~52
39~104
55~146
13~34
27~73
27~39
14
31~82
62~165
87~232
20~54
44~116
40~58
16
48~129
97~257
136~362
32~84
68~181
70~100
QStructure and Function of Hard Lock Nuts® EHard Lock Nuts® is a registered trademark of Hard Lock
Screw Center of
Bolt and Nut
PACK-UNUT
PACK-UNUTK
PACK-UNUTS
Unit Price Volume Discount Rate Unit Price Volume Discount Rate Unit Price Volume Discount Rate
1~9 pkg(s). 10 pkgs. or More 1~9 pkg(s). 10 pkgs. or More 1~9 pkg(s). 10 pkgs. or More
(e)
3
3.9
4.2
6.1
7.1
9
13
QFeatures of U-Nuts®
· Capable of stable anti-loosening effect. Prevents screws from falling off even with
declines in axial tension.
· Being a solid metal product, the nuts are highly resistant to heat and cold.
· Simplified fastening task makes work management easier.
· Easy parts management prevents inappropriate installation.
· Reusable.
QDouble Locking Nuts
d
SSRBW
4
5
6
8
10
12
Type
Configure Online
M Material: 304 Stainless Steel
H Hardness: 37 to 46HRC
J IS B 1251 Class 2
Equivalent
Part Number
D
Type No.
Part Number
h
Reference
Dim.
H
M Material: From 1049 Carbon Steel to S70C
H Hardness: 40 to 48HRC
S Surface Treatment: Tempered Collar JIS
B 1251
ENo.3 to 5, Light Load; No.6 to 24, Heavy Load
2 -223
D
d
t
d D D1 t
h
m
EU-Nuts® is a trademark of Fuji Seimitsu Co. Ltd.
S
M
D1
l1
b
d
Part Number
Type
No.
-
100
100
100
100
50
12
50
16
50
* 100 pcs./pkg. for M4~8; 50 pcs./pkg. for M10~16.
2 1
H
M Material: 304 Stainless Steel
E10 pcs. per pkg.
301 Stainless Steel
4
5
PACK-ZATT
l
301 Stainless Steel
When the friction ring makes a contact with the thread as shown
in the figure below, spring action generates a reaction force P.
A friction torque (prevailing torque) that prevents the nut from
rotating is then generated by the nut due to another reaction
force P'.
UNUT, UNUTZ4~12
UNUTK, UNUTKZ4~12
h
m
301 Stainless Steel
Screw
Precision
Pure Titanium
Class 2
Pure Titanium
Class 2
Pure Titanium
Class 2
PACK-UNUT
6
PACK-UNUTK 8
PACK-UNUTS 10
t
b
PACK-UNUTS
4
5
6
8
10
12
16
t
D
Axial Force [kN]
Junker Test Result
15
UNUTSZ
1018 Carbon Steel or
Equivalent
1018 Carbon Steel or
Equivalent
304 Stainless Steel or
Equivalent
Friction Ring
QRecommended Tightening Torque and Tightening Force
8mm Standard Nut and Nord-Lock
tightened at 70% Yielding Point
PACK-UNUTK
UNUTZ
UNUTKZ
UNUTSZ
Unit Price Volume Discount Rate Unit Price Volume Discount Rate Unit Price Volume Discount Rate
1~9 pc(s). 10 pcs. or More 1~9 pc(s). 10 pcs. or More 1~9 pc(s). 10 pcs. or More
M
Wrong
QCautions on Repeated Use
M
Friction Ring
M
@
The washers come pre-assembled in pairs (glued).
Upon reusing, please confirm the cams are not worn or cracked, and follow the installation instruction on the right.
Do not use together with other washers.
Screw M8 (A4-80) Tightening Length: 25mm
PACK-UNUT
UNUTKZ
SSurface
Treatment
Bright Chromate
Plating
Trivalent
Chromate
@ >b
QProper Installation
QAllowable Temperature
UNUTZ
UNUT, UNUTZ16
UNUTK, UNUTKZ16
UNUTS, UNUTSZ4~16
Friction Ring
Material
Main Material
Pkg.
90°~120°
M Material: 316L Stainless Steel Equivalent H Hardness: 51HRC
EThis product is to be used in pairs.
D
90°~120°
t
Part Number Applicable
Screw
Type No.
3
M3
4
M4
5
M5
NLDF 6 M6
8
M8
10 M10
12 M12
(e)
d
D
NLDF
Industry Co., Ltd.
Cautions
Screws or shafts should be made to JIS6g (Class 2) in thread precision.
Nuts may not fit well in different thread precision. Although O.D. of the
upper nut and the lower nut may become eccentric or clearance may occur
during assembling caused by its structure, it does not affect the operation.
Part Number
HLN8
Configure Online
Configure Online
* Fig.-1: When upper nut is tightened, stress is automatically applied in P1
arrow direction. Horizontal stress continues to increase with tightening
until upper nut closely contacts lower nut as shown in Fig.-2. The nuts are
fully locked by the wedge effect.
* Fig.-2: After nuts are tightened, internal stress remains distributed as
composite stress of P1+P2+P3 to resist external impact.
2 -224