Section C_C1 - C16 3/31/14 8:37 AM Page 28
Flexible Jaw
Couplings
Martin Universal (ML)
Martin Super (MS)
Now Martin Offers Two Styles
The Martin Super — Higher Horsepower
The Martin Universal — Completely Interchangeable
• no lubrication
• easy inspection of load carrying spider
• easy Installation
• Flexibility of angular or parallel
misalignment of shafts by Buna-n spider
member permits smooth “power transmission”
• no metal to metal Contact
• resistant to oil, dirt, sand, moisture, grease
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Section C_C1 - C16 3/31/14 8:37 AM Page 29
Stock Jaw
Couplings
Jaw Coupling Selection Procedure
a. determine service Factor by matching driven unit with prime mover in service Factor guide.
B. multiply service Factor by driven unit or motor h.p. to obtain adjusted h.p.
C. select Flexible Coupling with horsepower Capacity equal to or greater than adjusted h.p.
Service Factor Guide
Driven Unit (Machinery)
Electric Motor or
Steam Turbine
Prime Mover
Gasoline or Diesel
Engine, 6 or More Cyl.
Gasoline or Diesel
Engine, Less Than 6 Cyl.
1.0
1.5
2.0
1.5
2.0
2.5
2.0
2.5
3.0
Light: uniform or steady load never exceeding horsepower rating, infrequent starting. agitators,
Blowers, Conveyors, evaporators, Fans, generators, Centrifugal pumps, stokers
Moderate: heavy inertia, moderate shock, frequent starting; peak loads do not exceed 125 per cent
average horsepower. uneven load. Beaters, rotary pumps and Compressors, Cranes, elevators,
mine and propellor Fans, generators, pulp grinders, hoists, Kilns, machine tools, mixers, gear
pumps, Woodworking machines
Heavy: heavy shock conditions or frequent reversing. peak loads do not exceed 150 per cent
average horsepower. uneven load. reciprocating pumps and Compressors, Crushers, Freight and
passenger elevators, mills (hammer, Ball, rolling, turf, Flour), vibrating screens, Winches, Wire
drawing machines, punches, shears
Bore tolerances:
0.5 – 1.75 + 0.001 – 0.000
1.8125 – 2.625 + 0.0015 – 0.0000
Martin ML (Universal Series) — Torque and Horsepower Ratings
Catalog
Number
Stainless Steel
Catalog
Number
ml035
ml050
ml070
ml075
ml090
ml095
ml099
ml100
ml110
ml150
ml190
ml225
ml035ss
ml050ss
ml070ss
ml075ss
ml090ss
ml095ss
ml099ss
ml100ss
ml110ss
ml150ss
ml190ss
ml225ss
Torque Rating
Lb. — In.
Buna-N
Hytrel®
3.5
31.5
42
81
140
189
290
416
756
1197
1512
2268
100
–
94.5
126
242
420
567
870
1248
2268
3591
4536
6804
Buna-N
Horsepower Capacity at Various RPM
300
1200
0.006
0.05
0.07
0.13
0.22
0.30
0.46
0.66
1.2
1.9
2.4
3.6
0.02
0.15
0.21
0.39
0.66
0.90
1.4
2.0
3.6
5.7
7.2
10.8
0.07
0.60
0.84
1.56
2.64
3.6
5.5
7.9
14.4
22.8
28.8
43.2
1800
3600
0.10
0.9
1.2
2.3
4.0
5.4
8.3
11.9
21.6
34.2
43.2
64.8
0.20
1.8
2.5
4.7
7.9
10.8
16.6
23.8
43.2
68.4
86.4
129.6
Max.
Bore
(Each)
Weight
0.375
0.625
0.750
0.875
1.125
1.125
1.375
1.375
1.625
1.875
2.125
2.625
0.10
0.15
0.31
0.45
0.75
0.89
1.02
1.48
3.18
4.83
7.65
10.66
note: above h.p. capacities are for Buna-n rubber spider and service factor of one. When hytrel spider is used multiply capacities by three.
Martin MS (Super Series) — Torque and Horsepower Ratings
Catalog
Number
ms050
ms070
ms075
ms090
ms095
ms099
ms100
ms110
ms150
ms190
ms225
Torque Rating
Lb. — In.
Buna-N
Hytrel®
37.3
59.4
157
241
241
512
512
1014
1630
2450
2920
112
178
471
723
723
1536
1536
3042
4890
7350
8760
100
0.06
0.09
0.25
0.38
0.38
0.81
0.81
1.6
2.6
3.9
4.6
Buna-N
Horsepower Capacity at Various RPM
300
1200
1800
0.18
0.28
0.75
1.1
1.1
2.4
2.4
4.8
7.7
11.6
13.9
0.71
1.1
3.0
4.6
4.6
9.7
9.7
19.3
31.0
46.6
55.5
1.0
1.7
4.5
6.9
6.9
14.6
14.6
28.9
46.5
69.9
83.2
3600
2.1
3.4
8.9
13.7
13.7
29.2
29.2
57.8
93.0
139.7
166.5
Max.
Bore
(Each)
Weight
0.625
0.750
0.875
1.125
1.125
1.325
1.325
1.325
1.875
2.125
2.625
0.13
0.25
0.53
0.58
0.70
1.12
1.43
3.24
4.76
7.66
10.76
NOTE: above h.p. capacities are for Buna-n rubber spider and service factor of one. When hytrel spider is used multiply capacities by three.
Misalignment Capacities: Angular up to 1°, Parallel up to .015 inches.
hytrel is a registered trademark of e.I. dupont & Co.
C-29
Section C_C1 - C16 3/31/14 8:37 AM Page 30
Stock Jaw
Couplings
Coupling Half
Spider
Coupling Half
Dimensions
Spiders — Buna-N (Rubber) and Hytrel
Catalog
Number
Hub
Dia. A
Overall
Length B
ml035
ml or ms050
ml or ms070
ml or ms075
ml or ms090
ml or ms095
ml or ms099
ml or ms100
ml or ms110
ml or ms150
ml or ms190
ml or ms225
5
⁄8
11⁄16
13⁄8
13⁄4
21⁄8
21⁄8
217⁄32
217⁄32
35⁄16
33⁄4
41⁄2
5
13
⁄16
123⁄32
2
21⁄8
21⁄8
21⁄2
27⁄8
31⁄2
41⁄4
41⁄2
47⁄8
53⁄8
Distance
Betw.
Flanges C
Length
Thru
Bore D
Min.
Max.
Weight
Lbs.
⁄32
⁄32
1
⁄2
1
⁄2
1
⁄2
1
⁄2
3
⁄4
3
⁄4
7
⁄8
1
1
1
⁄64
⁄8
3
⁄4
13
⁄16
13
⁄16
1
11⁄16
13⁄8
111⁄16
13⁄4
115⁄16
23⁄16
⁄8
⁄4
1
⁄4
1
⁄4
1
⁄4
7
⁄16
1
⁄2
1
⁄2
1
⁄2
5
⁄8
3
⁄4
3
⁄4
⁄8
⁄8
3
⁄4
7
⁄8
11⁄8
11⁄8
13⁄8
13⁄8
15⁄8
17⁄8
21⁄8
25⁄8
.07
.13
.25
.44
.69
.84
1.19
1.47
3.20
4.50
8.25
12.00
9
17
15
5
Bore
1
3
1
5
Bore sizes are standard in 1/16" increments from minimum to maximum bore range and have keyway
and set screw except as shown below:
1
/8 through 3/8 Bore — no KW — no ss
#050 — 7/16 through 5/8 Bore — no KW — 1-ss
#070, 075, 090, 095 — 7/16 and 1/2 Bore — no KW — 1-ss
#099, 100, 110 — 1/2 Bore — no KW — no ss
#150 — 5/8 Bore — no KW — no ss
#190, 225 — 3/4 Bore — no KW — no ss
note: In each coupling size a min. plain bore is available that can be used to make special bores
such as spline, hex, metric, or other shapes or sizes.
For standard Keyway sizes see Martin Catalog, page e-158 and e-159.
Coupling Selection Chart for 60 Hz Nema Motor Frames
Based on Buna-N (Rubber) Spider ★†
Shaft
Diameter
Nema
Frame
Coupling
Size
MS
Max. Horsepower Rating @ RPM
1725
3450
ML
MS
ML
MS
ML
⁄8
⁄2
5
⁄8
3
⁄4
7
⁄8
42
48
56,56 h
66
56hz, 143t, 145t
182, 184
182t, 184t, 213
215
213t, 215t, 245u, 256u
254t, 256t, 248u, 286u
284t, 286t, 324u, 326u, 326ts
324t, 326t, 364u, 365u
364t, 365t
050
050
050
070
075
090
095
099
100
110
150
190
225
⁄2
⁄2
1
⁄2
1
2
3
3
71⁄2
71⁄2
15
30
40
50
⁄2
⁄2
1
⁄2
3
⁄4
1
2
3
5
71⁄2
10
20
25
40
3
1
11⁄8
13⁄8
15⁄8
17⁄8
21⁄8
23⁄8
1140
1
1
1
1
1
1
1
11⁄2
3
5
5
10
10
25
40
60
75
⁄4
⁄4
3
⁄4
1
2
3
5
71⁄2
10
20
30
40
60
3
3
2
2
2
3
71⁄2
10
10
25
25
50
75
125
150
C-30
srl035
srl050
srl070
srl075
srl090
srl099
srl110
srl150
srl190
srl225
shl035
shl050
shl070
shl075
shl090
shl099
shl110
shl150
shl190
shl225
Accommodates
Coupling
Net Weight Lbs.
Buna-N
Hytrel
ml035
m 050 — ms 050
ml070 — ms 070
ml075 — ms 075
ml or ms090-095
ml or ms099-100
ml110 — ms110
m150 — ms150
ml190 — ms190
ml225 — ms225
.009
.013
.017
.03
.04
.07
.14
.21
.27
.41
.009
.013
.017
.03
.04
.07
.14
.21
.27
.41
urethane spiders available. please consult factory.
Spiders — Urethane† and Bronze★
Catalog Number
Urethane
Bronze★
Accommodates
Coupling
Net Weight Lbs.
Urethane
Bronze
sul035 sBl035
sul050 sBl050
sul070 sBl070
sul075 sBl075
sul090/ sBl090/
095
095
sul099/ sBl099/
100
100
sul110 sBl110
sul150 sBl150
sul190 sBl190
sul225 sBl225
ml 035
ml050 — ms050
ml070 — ms070
ml075 — ms075
.009
.013
.017
.03
0.05
0.08
0.06
0.15
ml or ms 090-095
.04
0.17
ml or ms 099-100
.07
0.50
ml110 — ms110
ml150 — ms150
ml190 — ms190
ml225 — ms225
.14
.21
.27
.41
0.62
1.00
1.30
1.60
★ Bronze spiders available as made to order.
11⁄2
11⁄2
11⁄2
2
3
71⁄2
10
15
20
40
60
75
100
NOTE: Coupling sizes are based on the rated torque, max. bore and a have a service factor of 1.0.
★ When using Hytrel or Bronze spider multiply above horsepower ratings by 3.
† When using Urethane spider multiply above horsepower ratings by 1.5.
Catalog Number
Buna-N
Hytrel
metric Bore sizes available
Consult Factory