Couplings

Couplings
REX ® THOMAS ® FLEXIBLE DISC COUPLINGS
HIGH PERFORMANCE THP
THP couplings are designed for use on high speed equipment where coupling size and weight must be kept to a minimum. Typically, these
couplings connect prime movers such as motors, steam and gas turbines, rotary engines and gas expanders, to centrifugal and rotary
compressors, generators, process and boiler feed pumps. Test stand and marine propulsion drives also benefit from this unique coupling
design.
The flexing elements are precision-stamped from a high strength 300 series stainless steel. This material has been used successfully for
many years in Thomas couplings manufactured for helicopter drive shaft applications. Special materials for hubs, spacers and/or flexing
elements are available to meet unique application requirements.
Construction
Hubs and Center Member: Heat Treated 4140 and 4340 Alloy Steel
Bolts: Aircraft quality Alloy Steel with twelve point wrenching pattern
Disc Packs: High Strength 300 Series Stainless Steel
Coatings Available: Black Oxide, Zinc, Cadmium, other coatings available per
customer specifications
System Analysis
A coupling is a critical component of any drive system. The basic coupling selection
criteria is used to determine the size and style only. It is recommended that the system
be analyzed for torsional and lateral stability using the specific coupling mass elastic
data. The coupling weight, inertia, lateral stiffness, and torsional stiffness are available
for this system analysis. It is the responsibility of the coupling user to assure the system,
with the coupling as a component, properly functions.
General Dimensions (inch)
Other materials such as, Monel and Inconel
are available; please consult Rexnord
Industries, Inc.
Coupling
Size
A B C D E F
➀
Max
Bore
➁ Hydraulic
G H L M N
442-6
5.375
2.062
18.00
3.125
2.875
23.125
3.000
2.
0 0.125
4.500
3.79
519-6
6.375
2.594
18.00
3.875
3.625
24.312
3.750
2.
5 0.125
5.312
4.56
519-8
6.438
2.594
18.00
3.875
3.625
24.312
3.750
2.
5 0.125
5.312
4.56
638-6
7.688
3.094
18.00
4.625
4.375
25.438
4.500
3.
0 0.125
6.375
5.00
638-8
7.688
3.094
18.00
4.625
4.375
25.438
4.500
3.
0 0.125
6.375
5.05
744-6
8.875
3.688
18.00
5.438
5.125
26.625
5.250
3.
5 0.125
7.438
5.29
744-8
8.875
3.688
18.00
5.438
5.125
26.625
5.250
3.
5 0.125
7.438
5.31
850-6
10.125
4.188
18.00
6.250
5.875
27.750
6.000
4.
0 0.125
8.312
6.26
850-8
10.125
4.188
18.00
6.250
5.875
27.750
6.000
4.
0 0.125
8.312
6.32
948-6
11.43
8 4.688
18.00
7.000
6.562
28.875
6.750
4.
5 0.125
9.344
7.26
948-8
11.43
8 4.688
18.00
7.000
6.562
28.875
6.750
4.
5 0.125
9.344
7.27
1025-6
12.500
5.28118.00
7.750
7.250
30.312
7.500
5.
0 0.125
10.344
8.12
1025-8
12.500
5.28118.00
7.750
7.250
30.312
7.500
5.
0 0.125
10.344
8.19
A G H
L
B
D
E
C
F
M
CG
N
Engineering Data
Max.
➄
➄
6
➀
Max.
Cont.
Half Torsional
Spacer Tube Per Inch
Axial
Standard
Torque Max.
➄ ➄ Coupling Stiffness
Capacity
Cont. B ore Rating Speed
W t.
WR
2
C .G. Kt
x 106
Kt
x 106
Weight WR
2 (Continuous)
Size ( in. ) ( l b.-in.
) RPM
(lb.)
( lb-in.
) ( in. ) (lb.-in./Rad.) (lb.-in./Rad.) (lb.) ( lb-in.
) (in.)
➂➃
442-6
2.
0 27,000
28,500
21.
3 65.
8 1.64
0.782
30.
5 0.33
0.74
±0.120
519-6
2.
5 51,000
24,000
35.
3 163
2.01
1.60
59.
6 0.41
1.45
±0.145
519-8
2.
5 75,000
23,800
36.
2 173
2.01
1.84
59.
6 0.41
1.45
±0.100
638-6
3.
0 78,000
19,900
54.
5 365
2.43
2.85
103
0.50
2.51
±0.175
638-8
3.
0 120,000
19,900
55.
4 378
2.44
3.27
103
0.50
2.51
±0.125
744-6
3.
5 124,500
17,200
82.
3 730
2.87
5.01
208
0.73
5.07
±0.205
744-8
3.
5 176,250
17,200
83.
7 759
2.88
5.81
208
0.73
5.07
±0.145
850-6
4.
0 195,000
15,100
125
1, 470
3.18
8.12
378
1.00
9.20
±0.235
850-8
4.
0 294,000
15,100
127
1, 530
3.19
9.54
378
1.00
9.20
±0.165
948-6
4.
5 285,000
13,400
174
2, 600
3.57
12.
8
617
1.31
15.
0 ±0.265
948-8
4.
5 427,500
13,400
178
2, 730
3.57
15.
4
617
1.31
15.
0 ±0.185
1025-6
5.
0 375,000
12,250
235
4, 230
4.02
18.
5
954
1.65
23.
2 ±0.290
1025-8
5.
0 579,000
12,250
240
4, 430
4.04
22.
3
954
1.65
23.
2 ±0.205
➀ For larger bores, consult Rexnord .
➁ May be reduced for smaller shaft sizes. Consult Rexnord .
➂ Minimum application factor to be applied = 1.5.
➃ Max. peak overload torque = 1.33 x max. cont. torque
➄ Information based on standard dimensional data shown.
6 Max. transient axial misalignment = 120% of values shown above.
Consult Rexnord with specific application requirements.
Note: Catalog dimensions subject to change.
Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request. 31