Couplings

REX ® THOMAS ® SINGLE-FLEXING DISC COUPLINGS
Couplings
TYPE ST
ST couplings are designed for applications which require the coupling to support a substantial radial load while accommodating angular
misalignment. Typical installations include units where one shaft is fully supported in its own bearings, and the other shaft is single-bearing
supported. The radial load is transmitted through the coupling to the inner bearing of the other shaft.
Belt drives can be designed to utilize this type of coupling to eliminate a jack shaft bearing and transfer radial loading directly to a machine
bearing. Such arrangements are economical and space saving. See the sketches below.
Construction
Hubs: Cast Alloy Iron
Bolts: Alloy Steel
Disc Packs: Tomaloy Tpack (225-750 Sizes)
Coatings Available: Black Oxide, Zinc, Cadmium
Other materials such as Stainless Steel, Monel and
Inconel are available; please consult Rexnord Industries,
Inc.
Note:
Single-flexing couplings cannot accommodate parallel
misalignment. They are not suitable for connecting equipment
where both shafts are held rigidly in their own bearings.
SINGLE
BEARING
MULTIPLE
V-BELT DRIVE
X
MOTOR
Y
2 BEARINGS
COMPRESSOR
GENERATOR
General Dimensions (inch)
1 BEARING
Coupling
Size
➆
Rough
Bore
Max
Bore
A B F G N
162
– 1.62
4.59
1.75
3.91
2.75
0.41
200
– 2.00
5.75
2.12
4.69
3.62
0.44
225
– 2.25
6.00
2.50
5.44
3.88
0.44
262
– 2.62
6.88
2.88
6.28
4.50
0.53
312
– 3.12
8.12
3.38
7.38
5.44
0.62
350
– 3.50
9.12
3.75
8.19
6.00
0.69
375
– 3.75
10.06
4.00
8.88
6.50
0.88
425
– 4.25
11.00
4.25
9.38
7.00
0.88
450
– 4.50
11.88
4.50
9.94
7.44
0.94
500
2.69
5.00
13.44
5.00
11.12
8.38
1.12
550
2.69
5.50
15.00
5.50
12.31
9.44
1.31
600
3.69
6.00
16.75
6.00
13.38
10.31
1.38
700
4.25
7.00
18.94
7.00
15.62
11.75
1.62
750
4.94
7.50
20.62
7.25
16.31
12.62
1.81
800
5.19
8.00
22.38
7.75
17.38
13.75
1.88
A
G
B
N
F
B
AXIAL
CAPACITY
➀
Engineering Data
Max Horsepower Per 100 RPM
➅ ➅
Max.
Max.
Peak
➀
Radial
Smooth
Pulsating
Continuous
Overload
➁ ➁ Axial
Coupling L oad
➂ ➃ ➄ ➂ ➃ ➄ Torque Torque W eight
WR
2
Capacity
Size ( lb. ) Col.
1 Col.
2 Col.
3 Col.
4 Col.
5 Col. 6 Max. RPM (lb.-in.) (lb.-in.) ( lb. ) ( lb.-in.
) (in.)
162
150
0.
8 1.
1 1.
4 0.
4 0.
6 0.
7 2,500
880
1,320
7 16
±0.018
200
225
1.
5 2.
1 2.
7 0.
7 1.
0 1.
3 2,500
1,700
2,550
14
46
±0.018
225
340
2.
1 3.
0 3.
8 1.
0 1.
5 1.
9 2,500
2,400
3,600
15
59
±0.018
262
520
3.
8 5.
3 6.
8 1.
9 2.
6 3.
4 2,500
4,280
6,420
23
120
±0.022
312
700
6.
0 8.
4 10.
7 3.
0 4.
2 5.
4 2,500
6,740
10,100
41
310
±0.026
350
900
8.
5 11.
9 15.
3 4.
2 6.
0 7.
6 2,300
9,640
14,500
56
520
±0.028
375
1,250
13.
1 18.
3 23.
6 6.
6 9.
2 11.
8 2,200
14,900
22,400
71
820
±0.031
425
1,500
17.
0 23.
8 30.
6 8.
5 11.
9 16.
3 1,900
19,300
29,000
93
1,300
±0.034
450
1,800
21.
7 30.
4 39.
0 10.
8 15.
2 19.
5 1,500
24,600
36,900
110
1,700
±0.036
500
2,400
33.
5 46.
9 60.
3 16.
8 23.
4 30.
2 1,500
38,000
57,000
160
3,100
±0.041
550
3,200
48.
9 68.
4 87
24.
4 34.
2 43.
5 1,500
54,800
82,200
230
5,600
±0.046
600
4,000
68.
6 96
123
34.
3 48.
0 61.
5 1,200
77,500
116,00
0 300
8,400
±0.051
700
5,500
106
148
190
53.
0 74.
0 95.
0 1,100
120,000
180,000
440
18,000
±0.058
750
6,500
139
194
250
69.
5 97.
0 125
1,000
158,000
237,000
590
27,000
±0.062
800
7,700
177
247
318
88.
5 124
159
900
200,000
300,000
700
39,000
±0.068
F or ordering instructions, see pages 10-11.
➀ All Thomas disc couplings meet NEMA frame sleeve bearing motor specifications without modification or the addition of end-float restricting devices .
➁ Weight
and WR2 at maximum bore.
➂ Col. 1 gives maximum HP/100 RPM permitted when combined with maximum radial load.
➃ Col.
2 gives maximum HP/100 RPM permitted when combined with
2
/3 maximum radial load.
➄ Col.
3 gives maximum HP/100 RPM permitted when combined with
/3 maximum radial load.
➅ Maximum torque and peak overload torque are based on
/3 maximum radial load.
➆ C onsult Rexnord for minimum rough bore on sizes 162-450.
28
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.