Flexible Beam Couplings
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PSR - Flexible Beam Coupling

Aluminum Set Screw Flexible Beam Coupling

Features

  • Aluminum
    • Extra flexible with low bearing loads
    • Lightweight for low inertia
    • Temperature range: -40°F to 225°F
  • Stainless Steel
    • Flexible with low bearing loads
    • Corrosion resistant
    • Temperature range: -40°F to 350°F
  • Multiple beam cuts improve parallel misalignment capabilities
  • Zero backlash
  • Constant velocity
  • RoHS2 and REACH Compliant
  • Maximum speed: 6,000 RPM
  • Bore tolerance: +.025mm/–.000mm

How to Specify

Part numbers are in the following format with numbers representing sixteenths of an inch:

order bc

Inch to Metric Bore Combinations

  • Inch to metric bore combinations are available on the P-Series Beam Coupling conversion page
  • For help on inch to metric bore combinations please email

 
 
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  Click part number for full technical specs, CAD files, and pricing
Part Number Material Large
Bore
B1 (in)
Small
Bore
B2 (in)
Outer
Diameter
OD (in)
Length
L (in)
Set
Screw
Static
Torque
(lb-in)
Torsional
Stiffness
(Deg/lb-in)
Moment
of Inertia
(lb-in²)
Angular
(Deg)
Parallel
(in)
Axial
Motion
(in)
                       
PSR10-2.5-2.5-A Aluminum 0.156 0.156 0.625 0.800 M3 12 0.540 0.0011 0.008 0.005
PSR10-2.5-2.5-SS Stainless 0.156 0.156 0.625 0.800 M3 16 0.286 0.0030 0.008 0.005
PSR10-2.5-2-A Aluminum 0.156 0.125 0.625 0.800 M3 12 0.540 0.0011 0.008 0.005
PSR10-2.5-2-SS Stainless 0.156 0.125 0.625 0.800 M3 16 0.286 0.0030 0.008 0.005
PSR10-2-2-A Aluminum 0.125 0.125 0.625 0.800 M3 15 0.360 0.0011 0.008 0.005
PSR10-2-2-SS Stainless 0.125 0.125 0.625 0.800 M3 20 0.184 0.0030 0.008 0.005
PSR10-3-2.5-A Aluminum 0.188 0.156 0.625 0.800 M3 12 0.540 0.0011 0.008 0.005
PSR10-3-2.5-SS Stainless 0.188 0.156 0.625 0.800 M3 16 0.286 0.0030 0.008 0.005
PSR10-3-2-A Aluminum 0.188 0.125 0.625 0.800 M3 12 0.540 0.0011 0.008 0.005
PSR10-3-2-SS Stainless 0.188 0.125 0.625 0.800 M3 16 0.286 0.0030 0.008 0.005
PSR10-3-3-A Aluminum 0.188 0.188 0.625 0.800 M3 12 0.540 0.0011 0.008 0.005
PSR10-3-3-SS Stainless 0.188 0.188 0.625 0.800 M3 16 0.286 0.0030 0.008 0.005
PSR12-2.5-2.5-A Aluminum 0.156 0.156 0.750 0.900 M4 17 0.260 0.0025 0.008 0.005
PSR12-2.5-2.5-SS Stainless 0.156 0.156 0.750 0.900 M4 23 0.151 0.0070 0.008 0.005
PSR12-2.5-2-A Aluminum 0.156 0.125 0.750 0.900 M4 17 0.260 0.0025 0.008 0.005
PSR12-2.5-2-SS Stainless 0.156 0.125 0.750 0.900 M4 23 0.151 0.0070 0.008 0.005
PSR12-2-2-A Aluminum 0.125 0.125 0.750 0.900 M4 26 0.180 0.0025 0.008 0.005
PSR12-2-2-SS Stainless 0.125 0.125 0.750 0.900 M4 35 0.085 0.0070 0.008 0.005
PSR12-3-2.5-A Aluminum 0.188 0.156 0.750 0.900 M4 17 0.260 0.0025 0.008 0.005
PSR12-3-2.5-SS Stainless 0.188 0.156 0.750 0.900 M4 23 0.151 0.0070 0.008 0.005
PSR12-3-2-A Aluminum 0.188 0.125 0.750 0.900 M4 17 0.260 0.0025 0.008 0.005
PSR12-3-2-SS Stainless 0.188 0.125 0.750 0.900 M4 23 0.151 0.0070 0.008 0.005
PSR12-3-3-A Aluminum 0.188 0.188 0.750 0.900 M4 17 0.260 0.0025 0.008 0.005
PSR12-3-3-SS Stainless 0.188 0.188 0.750 0.900 M4 23 0.151 0.0070 0.008 0.005
PSR12-4-2.5-A Aluminum 0.250 0.156 0.750 0.900 M4 14 0.330 0.0025 0.008 0.005
PSR12-4-2.5-SS Stainless 0.250 0.156 0.750 0.900 M4 19 0.179 0.0070 0.008 0.005
PSR12-4-2-A Aluminum 0.250 0.125 0.750 0.900 M4 14 0.330 0.0025 0.008 0.005
PSR12-4-2-SS Stainless 0.250 0.125 0.750 0.900 M4 19 0.179 0.0070 0.008 0.005
PSR12-4-3-A Aluminum 0.250 0.188 0.750 0.900 M4 14 0.330 0.0025 0.008 0.005
PSR12-4-3-SS Stainless 0.250 0.188 0.750 0.900 M4 19 0.179 0.0070 0.008 0.005
PSR12-4-4-A Aluminum 0.250 0.250 0.750 0.900 M4 14 0.330 0.0025 0.008 0.005
PSR12-4-4-SS Stainless 0.250 0.250 0.750 0.900 M4 19 0.179 0.0070 0.008 0.005
PSR14-3-3-A Aluminum 0.188 0.188 0.875 1.063 M4 20 0.170 0.0056 0.008 0.005
PSR14-3-3-SS Stainless 0.188 0.188 0.875 1.063 M4 27 0.091 0.0157 0.008 0.005
PSR14-4-3-A Aluminum 0.250 0.188 0.875 1.063 M4 18 0.210 0.0056 0.008 0.005
PSR14-4-3-SS Stainless 0.250 0.188 0.875 1.063 M4 24 0.107 0.0157 0.008 0.005
PSR14-4-4-A Aluminum 0.250 0.250 0.875 1.063 M4 18 0.210 0.0056 0.008 0.005
PSR14-4-4-SS Stainless 0.250 0.250 0.875 1.063 M4 24 0.107 0.0157 0.008 0.005
PSR14-5-3-A Aluminum 0.313 0.188 0.875 1.063 M4 16 0.270 0.0056 0.008 0.005
PSR14-5-3-SS Stainless 0.313 0.188 0.875 1.063 M4 22 0.135 0.0157 0.008 0.005
PSR14-5-4-A Aluminum 0.313 0.250 0.875 1.063 M4 16 0.270 0.0056 0.008 0.005
PSR14-5-4-SS Stainless 0.313 0.250 0.875 1.063 M4 22 0.135 0.0157 0.008 0.005
PSR14-5-5-A Aluminum 0.313 0.313 0.875 1.063 M4 16 0.270 0.0056 0.008 0.005
PSR14-5-5-SS Stainless 0.313 0.313 0.875 1.063 M4 22 0.135 0.0157 0.008 0.005
PSR16-4-4-A Aluminum 0.250 0.250 1.000 1.250 M4 36 0.160 0.0116 0.015 0.010
PSR16-4-4-SS Stainless 0.250 0.250 1.000 1.250 M4 49 0.079 0.0317 0.015 0.010
PSR16-5-4-A Aluminum 0.313 0.250 1.000 1.250 M4 33 0.180 0.0116 0.015 0.010
PSR16-5-4-SS Stainless 0.313 0.250 1.000 1.250 M4 44 0.094 0.0317 0.015 0.010
PSR16-5-5-A Aluminum 0.313 0.313 1.000 1.250 M4 33 0.180 0.0116 0.015 0.010
PSR16-5-5-SS Stainless 0.313 0.313 1.000 1.250 M4 44 0.094 0.0317 0.015 0.010
PSR16-6-4-A Aluminum 0.375 0.250 1.000 1.250 M4 30 0.200 0.0116 0.015 0.010
PSR16-6-4-SS Stainless 0.375 0.250 1.000 1.250 M4 41 0.103 0.0317 0.015 0.010
PSR16-6-5-A Aluminum 0.375 0.313 1.000 1.250 M4 30 0.200 0.0116 0.015 0.010
PSR16-6-5-SS Stainless 0.375 0.313 1.000 1.250 M4 41 0.103 0.0317 0.015 0.010
PSR16-6-6-A Aluminum 0.375 0.375 1.000 1.250 M4 30 0.200 0.0116 0.015 0.010
PSR16-6-6-SS Stainless 0.375 0.375 1.000 1.250 M4 41 0.103 0.0317 0.015 0.010
PSR18-4-4-A Aluminum 0.250 0.250 1.125 1.500 M5 47 0.100 0.0217 0.015 0.010
PSR18-4-4-SS Stainless 0.250 0.250 1.125 1.500 M5 63 0.053 0.0603 0.015 0.010
PSR18-5-4-A Aluminum 0.313 0.250 1.125 1.500 M5 44 0.110 0.0217 0.015 0.010
PSR18-5-4-SS Stainless 0.313 0.250 1.125 1.500 M5 60 0.056 0.0603 0.015 0.010
PSR18-5-5-A Aluminum 0.313 0.313 1.125 1.500 M5 44 0.110 0.0217 0.015 0.010
PSR18-5-5-SS Stainless 0.313 0.313 1.125 1.500 M5 60 0.056 0.0603 0.015 0.010
PSR18-6-4-A Aluminum 0.375 0.250 1.125 1.500 M5 40 0.140 0.0217 0.015 0.010
PSR18-6-4-SS Stainless 0.375 0.250 1.125 1.500 M5 54 0.071 0.0603 0.015 0.010
PSR18-6-5-A Aluminum 0.375 0.313 1.125 1.500 M5 40 0.140 0.0217 0.015 0.010
PSR18-6-5-SS Stainless 0.375 0.313 1.125 1.500 M5 54 0.071 0.0603 0.015 0.010
PSR18-6-6-A Aluminum 0.375 0.375 1.125 1.500 M5 40 0.140 0.0217 0.015 0.010
PSR18-6-6-SS Stainless 0.375 0.375 1.125 1.500 M5 54 0.071 0.0603 0.015 0.010
PSR18-8-4-A Aluminum 0.500 0.250 1.125 1.500 M5 34 0.220 0.0217 0.015 0.010
PSR18-8-4-SS Stainless 0.500 0.250 1.125 1.500 M5 46 0.111 0.0603 0.015 0.010
PSR18-8-5-A Aluminum 0.500 0.313 1.125 1.500 M5 34 0.220 0.0217 0.015 0.010
PSR18-8-5-SS Stainless 0.500 0.313 1.125 1.500 M5 46 0.111 0.0603 0.015 0.010
PSR18-8-6-A Aluminum 0.500 0.375 1.125 1.500 M5 34 0.220 0.0217 0.015 0.010
PSR18-8-6-SS Stainless 0.500 0.375 1.125 1.500 M5 46 0.111 0.0603 0.015 0.010
PSR18-8-8-A Aluminum 0.500 0.500 1.125 1.500 M5 34 0.220 0.0217 0.015 0.010
PSR18-8-8-SS Stainless 0.500 0.500 1.125 1.500 M5 46 0.111 0.0603 0.015 0.010
PSR20-4-4-A Aluminum 0.250 0.250 1.250 1.500 M6 68 0.060 0.0340 0.015 0.010
PSR20-4-4-SS Stainless 0.250 0.250 1.250 1.500 M6 92 0.031 0.0922 0.015 0.010
PSR20-5-4-A Aluminum 0.313 0.250 1.250 1.500 M6 64 0.060 0.0340 0.015 0.010
PSR20-5-4-SS Stainless 0.313 0.250 1.250 1.500 M6 86 0.037 0.0922 0.015 0.010
PSR20-5-5-A Aluminum 0.313 0.313 1.250 1.500 M6 64 0.060 0.0340 0.015 0.010
PSR20-5-5-SS Stainless 0.313 0.313 1.250 1.500 M6 86 0.037 0.0922 0.015 0.010
PSR20-6-4-A Aluminum 0.375 0.250 1.250 1.500 M6 60 0.070 0.0340 0.015 0.010
PSR20-6-4-SS Stainless 0.375 0.250 1.250 1.500 M6 81 0.044 0.0922 0.015 0.010
PSR20-6-5-A Aluminum 0.375 0.313 1.250 1.500 M6 60 0.070 0.0340 0.015 0.010
PSR20-6-5-SS Stainless 0.375 0.313 1.250 1.500 M6 81 0.044 0.0922 0.015 0.010
PSR20-6-6-A Aluminum 0.375 0.375 1.250 1.500 M6 60 0.070 0.0340 0.015 0.010
PSR20-6-6-SS Stainless 0.375 0.375 1.250 1.500 M6 81 0.044 0.0922 0.015 0.010
PSR20-8-4-A Aluminum 0.500 0.250 1.250 1.500 M6 52 0.120 0.0340 0.015 0.010
PSR20-8-4-SS Stainless 0.500 0.250 1.250 1.500 M6 70 0.064 0.0922 0.015 0.010
PSR20-8-5-A Aluminum 0.500 0.313 1.250 1.500 M6 52 0.120 0.0340 0.015 0.010
PSR20-8-5-SS Stainless 0.500 0.313 1.250 1.500 M6 70 0.064 0.0922 0.015 0.010
PSR20-8-6-A Aluminum 0.500 0.375 1.250 1.500 M6 52 0.120 0.0340 0.015 0.010
PSR20-8-6-SS Stainless 0.500 0.375 1.250 1.500 M6 70 0.064 0.0922 0.015 0.010
PSR20-8-8-A Aluminum 0.500 0.500 1.250 1.500 M6 52 0.120 0.0340 0.015 0.010
PSR20-8-8-SS Stainless 0.500 0.500 1.250 1.500 M6 70 0.064 0.0922 0.015 0.010
PSR6-1.5-1.5-A Aluminum 0.094 0.094 0.375 0.563 M2 5.5 1.340 0.0001 0.008 0.005
PSR6-1.5-1.5-SS Stainless 0.094 0.094 0.375 0.563 M2 7.5 0.751 0.0003 0.008 0.005
PSR8-1.5-1.5-A Aluminum 0.094 0.094 0.500 0.750 M2 8 0.750 0.0004 0.008 0.005
PSR8-1.5-1.5-SS Stainless 0.094 0.094 0.500 0.750 M2 11 0.368 0.0012 0.008 0.005
PSR8-2-1.5-A Aluminum 0.125 0.094 0.500 0.750 M2 8 0.750 0.0004 0.008 0.005
PSR8-2-1.5-SS Stainless 0.125 0.094 0.500 0.750 M2 11 0.368 0.0012 0.008 0.005
PSR8-2-2-A Aluminum 0.125 0.125 0.500 0.750 M2 8 0.750 0.0004 0.008 0.005
PSR8-2-2-SS Stainless 0.125 0.125 0.500 0.750 M2 11 0.368 0.0012 0.008 0.005
 
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. Parts PSR6, PSR8, PSR10, and PSR12 have one set screw on each end. PSR14, PSR16, PSR18, and PSR20 have two set screws on each end 120° apart. Stainless steel hardware available upon request.
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. 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 on straight bore couplings upon request. Please consult technical support for more assistance.
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