CMR series0 pages

THOMAS® FLEXIBLE DISC COUPLINGS
FLYWHEEL ADAPTER TYPE CMR
CMR couplings are used in heavy duty slow to medium speed applications, where high starting torque, shock loads, torque reversals or
continuous alternating torque is present. The open lug type center member provides ample clearance for assembly while minimizing the
space required for coupling installation.
The CMR couplings are designed with a flywheel adapter plate which bolts directly to the flywheel of an engine or compressor. The adapters
are made to fit accurately into the recess in the flywheel, and external strains on the crankshaft resulting from the misalignment of the driven
equipment is minimized.
Construction
Hubs: Cast Alloy Iron
Center Section: Sizes 162 – 750 are Cast Alloy Iron, Sizes 800 and above are Cast Steel
Bolts: Alloy Steel
Disc Packs: Tomaloy Tpack™ (225-750 Size)
Coatings Available: Black Oxide, Zinc, Cadmium

Other materials such as Stainless Steel, Monel
and Inconel are available; please consult
Rexnord Industries, Inc.
Misalignment: 1/3° per disc pack

**INCREASED TORQUE RATINGS**

CMR coupling
between engine and
reciprocating
compressor.

FLYWHEEL ADAPTER INFORMATION
Adapters can be furnished to accommodate virtually any flange design. Where possible, the user should select dimensions from the tables
below, as these represent industry standards and thus are the most economical selection. Note that most sizes are available either with SAE
bolting or Thomas heavy duty bolting.
Available Adapters
Coupling
Standard
Siz e
Adapters Available in Shaded Siz es (inch)
A
Adapter 8.500 9.500 10.375 12.375 13.875 16.000 18.375 20.375 22.500 26.500 28.875 Diameter
Tolerance 8.498 9.498 10.373 12.373 13.873 15.998 18.373 20.372 22.497 26.497 28.872
(in.)
162
8.5
200
9.5
225
10.38
AV
262
12.38
AIL
AB
312
13.88
LE
350
16
IN
TH
375
18.38
ES
ES
425
20.38
IZE
S
450
22.5
500
26.5
550
28.88
600
700
750
800
850
Siz es 925 to 1550 – Adapting dimensions on request.

22

Bolting
Light Duty
SAE Bolting
Bolt No.
Circle Holes
7.88
6
8.75
8
9.62
6
11.62
8
13.12
8
–
–
17.25
8
19.25
8
21.38
6
25.25 12
27.25 12

Siz e
(Dia.)
0.34
0.34
0.41
0.41
0.41
–
0.53
0.53
0.66
0.66
0.78

Heavy Duty
Thomas Bolting
Bolt No.
Circle Holes
7.5
8
8.62
8
9.5
8
11.5
8
12.5
8
14.38
8
16.75
8
18.5
8
20.5
8
24.5
12
26.88 12

Note: Dimensions subject to change. Certified dimensions of ordered material furnished on request.

Siz e
(Dia.)
0.41
0.47
0.47
0.53
0.66
0.078
0.078
0.091
1.03
1.03
1.03