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Ruland Manufacturing

Flexible Beam Couplings

PCR Flexible Beam Coupling - Stainless Steel

Stainless Steel Clamp Flexible Beam Coupling

Features

Flexible with low bearing loads
Corrosion resistant stainless steel
Multiple beam cuts improve parallel misalignment capabilities
Zero-backlash
Bore tolerance: +.001"/–.000"
Maximum speed: 6,000 RPM
Temperature range: -40°F to 350°F

How to Specify

Choose any Bore 1 and any Bore 2 available in a body size. Part numbers are in the following format with numbers representing sixteenths of an inch:

order bc

	Flexible Beam Coupling
	P-Series Aluminum Four Beam Couplings
	P-Series Stainless Steel Four Beam Couplings
	F-Series Aluminum Six Beam Couplings
	F-Series Stainless Steel Six Beam Couplings
	MW-Series Four Beam Couplings
	Coupling Support Form
	Product Index

Click part number for 3D CAD file

Part
Number

Bore
B1 (in)

Bore
B2 (in)

Outer
Diam.
OD (in)

Length
L (in)

Cap
Screw

Shaft
Penetration
(in)

Static
Torque
(lb-in)

Torsional
Stiffness
(Deg/lb-in)

MISALIGNMENT

Moment of Inertia (lb-in²)	Angular	Parallel (in)	Axial Motion (in)

PCR6

0.375

0.563

M1.6

0.235

7.5

0.751

0.0003

3°

0.008

0.005

PCR8

0.500

0.750

M2

0.265

11

11

0.368

0.368

0.0012

3°

0.008

0.005

PCR10

0.625

0.800

M2

0.336

20

16

16

0.184

0.286

0.286

0.0030

3°

0.008

0.005

PCR12

0.750

0.900

M2.5

0.386

35

23

23

19

0.085

0.151

0.151

0.179

0.0070

3°

0.008

0.005

PCR14

0.875

1.063

M3

0.450

27

24

22

0.091

0.107

0.135

0.0157

3°

0.008

0.005

PCR16

1.000

1.250

M4

0.545

49

44

41

0.079

0.094

0.103

0.0317

3°

0.015

0.010

PCR18

1.125

1.500

M4

0.670

63

60

54

46

0.053

0.056

0.071

0.111

0.0603

3°

0.015

0.010

PCR20

1.250

1.500

M4

0.670

92

86

81

70

0.031

0.037

0.044

0.064

0.0922

3°

0.015

0.010

Note 1	Static torque ratings are at maximum misalignment. To obtain dynamic rating, static ratings should be divided by 2 for non-reversing applications and by 4 for reversing applications.
Note 2	Hardware is alloy steel with black oxide finish. PCR series parts have socketed head cap screws on each end.
Note 3	Performance ratings are for guidance only. The user must determine suitability for a particular application.
Note 4	Coupling torque and torsional stiffness are determined by the largest bore selected.
Note 5	Torque ratings for the couplings are based on the physical limitations/failure point of the machined beams. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the machined beams. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the rated torque of the machined beams. Keyways are available to provide additional torque capacity in the shaft/hub connection when required. Please consult technical support for more assistance.