Flexible Beam Couplings
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FSR - Flexible Beam Coupling

Aluminum Set Screw Flexible Beam Coupling

Features

  • Aluminum
    • Torsionally stiff with dampening
    • Lightweight for low inertia
    • Temperature range: -40°F to 225°F
  • Stainless Steel
    • High torque and torsional stiffness
    • 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: +.001"/–.000"

How to Specify

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

order fsr

Inch to Metric Bore Combinations

  • Inch to metric bore combinations are available on the F-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)
                       
FSR10-3-3-A Aluminum 0.188 0.188 0.625 1.000 M4 13 0.360 0.0013 0.008 0.005
FSR10-3-3-SS Stainless 0.188 0.188 0.625 1.000 M4 18 0.088 0.0037 0.008 0.005
FSR10-4-3-A Aluminum 0.250 0.188 0.625 1.000 M4 13 0.360 0.0013 0.008 0.005
FSR10-4-3-SS Stainless 0.250 0.188 0.625 1.000 M4 18 0.088 0.0037 0.008 0.005
FSR10-4-4-A Aluminum 0.250 0.250 0.625 1.000 M4 13 0.360 0.0013 0.008 0.005
FSR10-4-4-SS Stainless 0.250 0.250 0.625 1.000 M4 18 0.088 0.0037 0.008 0.005
FSR12-3-3-A Aluminum 0.188 0.188 0.750 1.250 M4 26 0.152 0.0036 0.008 0.005
FSR12-3-3-SS Stainless 0.188 0.188 0.750 1.250 M4 41 0.079 0.0100 0.008 0.005
FSR12-4-3-A Aluminum 0.250 0.188 0.750 1.250 M4 26 0.152 0.0036 0.008 0.005
FSR12-4-3-SS Stainless 0.250 0.188 0.750 1.250 M4 41 0.079 0.0100 0.008 0.005
FSR12-4-4-A Aluminum 0.250 0.250 0.750 1.250 M4 26 0.152 0.0036 0.008 0.005
FSR12-4-4-SS Stainless 0.250 0.250 0.750 1.250 M4 41 0.079 0.0100 0.008 0.005
FSR12-5-3-A Aluminum 0.313 0.188 0.750 1.250 M4 20 0.229 0.0036 0.008 0.005
FSR12-5-3-SS Stainless 0.313 0.188 0.750 1.250 M4 31 0.096 0.0100 0.008 0.005
FSR12-5-4-A Aluminum 0.313 0.250 0.750 1.250 M4 20 0.229 0.0036 0.008 0.005
FSR12-5-4-SS Stainless 0.313 0.250 0.750 1.250 M4 31 0.096 0.0100 0.008 0.005
FSR12-5-5-A Aluminum 0.313 0.313 0.750 1.250 M4 20 0.229 0.0036 0.008 0.005
FSR12-5-5-SS Stainless 0.313 0.313 0.750 1.250 M4 31 0.096 0.0100 0.008 0.005
FSR16-4-4-A Aluminum 0.250 0.250 1.000 1.500 M5 35 0.064 0.0139 0.015 0.010
FSR16-4-4-SS Stainless 0.250 0.250 1.000 1.500 M5 53 0.034 0.0381 0.015 0.010
FSR16-5-4-A Aluminum 0.313 0.250 1.000 1.500 M5 33 0.093 0.0139 0.015 0.010
FSR16-5-4-SS Stainless 0.313 0.250 1.000 1.500 M5 50 0.046 0.0381 0.015 0.010
FSR16-5-5-A Aluminum 0.313 0.313 1.000 1.500 M5 33 0.093 0.0139 0.015 0.010
FSR16-5-5-SS Stainless 0.313 0.313 1.000 1.500 M5 50 0.046 0.0381 0.015 0.010
FSR16-6-4-A Aluminum 0.375 0.250 1.000 1.500 M5 33 0.093 0.0139 0.015 0.010
FSR16-6-4-SS Stainless 0.375 0.250 1.000 1.500 M5 50 0.046 0.0381 0.015 0.010
FSR16-6-5-A Aluminum 0.375 0.313 1.000 1.500 M5 33 0.093 0.0139 0.015 0.010
FSR16-6-5-SS Stainless 0.375 0.313 1.000 1.500 M5 50 0.046 0.0381 0.015 0.010
FSR16-6-6-A Aluminum 0.375 0.375 1.000 1.500 M5 33 0.093 0.0139 0.015 0.010
FSR16-6-6-SS Stainless 0.375 0.375 1.000 1.500 M5 50 0.046 0.0381 0.015 0.010
FSR20-5-5-A Aluminum 0.313 0.313 1.250 1.750 M6 70 0.038 0.0401 0.015 0.010
FSR20-5-5-SS Stainless 0.313 0.313 1.250 1.750 M6 142 0.017 0.1094 0.015 0.010
FSR20-6-5-A Aluminum 0.375 0.313 1.250 1.750 M6 61 0.048 0.0401 0.015 0.010
FSR20-6-5-SS Stainless 0.375 0.313 1.250 1.750 M6 129 0.023 0.1094 0.015 0.010
FSR20-6-6-A Aluminum 0.375 0.375 1.250 1.750 M6 61 0.048 0.0401 0.015 0.010
FSR20-6-6-SS Stainless 0.375 0.375 1.250 1.750 M6 129 0.023 0.1094 0.015 0.010
FSR20-8-5-A Aluminum 0.500 0.313 1.250 1.750 M6 50 0.072 0.0401 0.015 0.010
FSR20-8-5-SS Stainless 0.500 0.313 1.250 1.750 M6 107 0.037 0.1094 0.015 0.010
FSR20-8-6-A Aluminum 0.500 0.375 1.250 1.750 M6 50 0.072 0.0401 0.015 0.010
FSR20-8-6-SS Stainless 0.500 0.375 1.250 1.750 M6 107 0.037 0.1094 0.015 0.010
FSR20-8-8-A Aluminum 0.500 0.500 1.250 1.750 M6 50 0.072 0.0401 0.015 0.010
FSR20-8-8-SS Stainless 0.500 0.500 1.250 1.750 M6 107 0.037 0.1094 0.015 0.010
FSR24-10-10-A Aluminum 0.625 0.625 1.500 2.250 M6 95 0.043 0.1023 0.030 0.015
FSR24-10-10-SS Stainless 0.625 0.625 1.500 2.250 M6 175 0.031 0.2814 0.030 0.015
FSR24-10-6-A Aluminum 0.625 0.375 1.500 2.250 M6 95 0.043 0.1023 0.030 0.015
FSR24-10-6-SS Stainless 0.625 0.375 1.500 2.250 M6 175 0.031 0.2814 0.030 0.015
FSR24-10-8-A Aluminum 0.625 0.500 1.500 2.250 M6 95 0.043 0.1023 0.030 0.015
FSR24-10-8-SS Stainless 0.625 0.500 1.500 2.250 M6 175 0.031 0.2814 0.030 0.015
FSR24-12-10-A Aluminum 0.750 0.625 1.500 2.250 M6 80 0.063 0.1023 0.030 0.015
FSR24-12-10-SS Stainless 0.750 0.625 1.500 2.250 M6 145 0.045 0.2814 0.030 0.015
FSR24-12-12-A Aluminum 0.750 0.750 1.500 2.250 M6 80 0.063 0.1023 0.030 0.015
FSR24-12-12-SS Stainless 0.750 0.750 1.500 2.250 M6 145 0.045 0.2814 0.030 0.015
FSR24-12-6-A Aluminum 0.750 0.375 1.500 2.250 M6 80 0.063 0.1023 0.030 0.015
FSR24-12-6-SS Stainless 0.750 0.375 1.500 2.250 M6 145 0.045 0.2814 0.030 0.015
FSR24-12-8-A Aluminum 0.750 0.500 1.500 2.250 M6 80 0.063 0.1023 0.030 0.015
FSR24-12-8-SS Stainless 0.750 0.500 1.500 2.250 M6 145 0.045 0.2814 0.030 0.015
FSR24-6-6-A Aluminum 0.375 0.375 1.500 2.250 M6 120 0.022 0.1023 0.030 0.015
FSR24-6-6-SS Stainless 0.375 0.375 1.500 2.250 M6 208 0.016 0.2814 0.030 0.015
FSR24-8-6-A Aluminum 0.500 0.375 1.500 2.250 M6 110 0.029 0.1023 0.030 0.015
FSR24-8-6-SS Stainless 0.500 0.375 1.500 2.250 M6 190 0.021 0.2814 0.030 0.015
FSR24-8-8-A Aluminum 0.500 0.500 1.500 2.250 M6 110 0.029 0.1023 0.030 0.015
FSR24-8-8-SS Stainless 0.500 0.500 1.500 2.250 M6 190 0.021 0.2814 0.030 0.015
 
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. Stainless steel hardware is available upon request. Parts FSR10 and FSR12 have one set screw on each end. Parts FSR16, FSR20, and FSR24 have two set screws on each end 120° apart.
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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