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Bellows Couplings
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BS - Set Screw Bellows Coupling

Set Screw Bellows Coupling BS Line Drawing

Features

  • High torque with low inertia
  • Balanced design for high RPM
  • Long life with no maintenance
  • High torsional stiffness
  • Constant velocity
  • Zero backlash
  • RoHS2 and REACH Compliant
  • Maximum speed: 10,000 RPM
  • Bore tolerance: +.001"/-.000"
  • Temperature Range: -40°F to 200°F

Material

  • Aluminum hubs are standard
  • Stainless steel hubs available upon request
 

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 bellows 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 Large
Bore
B1 (in)
Small
Bore
B2 (in)
Outer
Diameter
OD (in)
Length
L (in)
Hub
Width
LH (in)
Set
Screw
Static
Torque
(lb-in)
Torsional
Stiffness
(lb-in/Deg)
Angular
(Deg)
Parallel
(in)
Axial
Motion
(in)
                     
BS10-2-2-A 0.125 0.125 0.590 1.072 0.340 M3 22 72 1.5° 0.004 0.008
BS10-3-2-A 0.188 0.125 0.590 1.072 0.340 M3 22 72 1.5° 0.004 0.008
BS10-3-3-A 0.188 0.188 0.590 1.072 0.340 M3 22 72 1.5° 0.004 0.008
BS10-4-2-A 0.250 0.125 0.590 1.072 0.340 M3 22 72 1.5° 0.004 0.008
BS10-4-3-A 0.250 0.188 0.590 1.072 0.340 M3 22 72 1.5° 0.004 0.008
BS10-4-4-A 0.250 0.250 0.590 1.072 0.340 M3 22 72 1.5° 0.004 0.008
BS12-3-3-A 0.188 0.188 0.750 1.188 0.410 M3 40 120 1.5° 0.004 0.010
BS12-4-3-A 0.250 0.188 0.750 1.188 0.410 M3 40 120 1.5° 0.004 0.010
BS12-4-4-A 0.250 0.250 0.750 1.188 0.410 M3 40 120 1.5° 0.004 0.010
BS12-5-3-A 0.313 0.188 0.750 1.188 0.410 M3 40 120 1.5° 0.004 0.010
BS12-5-4-A 0.313 0.250 0.750 1.188 0.410 M3 40 120 1.5° 0.004 0.010
BS12-5-5-A 0.313 0.313 0.750 1.188 0.410 M3 40 120 1.5° 0.004 0.010
BS16-4-4-A 0.250 0.250 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-5-4-A 0.313 0.250 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-5-5-A 0.313 0.313 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-6-4-A 0.375 0.250 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-6-5-A 0.375 0.313 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-6-6-A 0.375 0.375 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-8-4-A 0.500 0.250 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-8-5-A 0.500 0.313 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-8-6-A 0.500 0.375 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS16-8-8-A 0.500 0.500 1.000 1.313 0.467 M4 60 244 1.5° 0.004 0.012
BS21-10-10-A 0.625 0.625 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-10-5-A 0.625 0.313 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-10-6-A 0.625 0.375 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-10-8-A 0.625 0.500 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-5-5-A 0.313 0.313 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-6-5-A 0.375 0.313 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-6-6-A 0.375 0.375 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-8-5-A 0.500 0.313 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-8-6-A 0.500 0.375 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS21-8-8-A 0.500 0.500 1.313 1.688 0.590 M4 120 400 1.5° 0.006 0.016
BS26-10-10-A 0.625 0.625 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-10-6-A 0.625 0.375 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-10-8-A 0.625 0.500 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-12-10-A 0.750 0.625 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-12-12-A 0.750 0.750 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-12-6-A 0.750 0.375 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-12-8-A 0.750 0.500 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-6-6-A 0.375 0.375 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-8-6-A 0.500 0.375 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS26-8-8-A 0.500 0.500 1.625 2.000 0.710 M5 250 550 2.0° 0.010 0.020
BS32-10-10-A 0.625 0.625 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-10-8-A 0.625 0.500 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-12-10-A 0.750 0.625 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-12-12-A 0.750 0.750 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-12-8-A 0.750 0.500 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-14-10-A 0.875 0.625 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-14-12-A 0.875 0.750 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-14-14-A 0.875 0.875 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-14-8-A 0.875 0.500 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-16-10-A 1.000 0.625 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-16-12-A 1.000 0.750 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-16-14-A 1.000 0.875 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-16-16-A 1.000 1.000 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-16-8-A 1.000 0.500 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
BS32-8-8-A 0.500 0.500 2.000 2.313 0.810 M6 400 950 2.0° 0.010 0.020
 
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 BS10 and BS12 have one set screw on each end. BS16, BS21, BS26 and BS32 have two set screws 90° apart.
Note 3 Performance ratings are for guidance only. The user must determine suitability for a particular application.
Note 4 Our standard couplings are supplied with black anodized aluminum hubs. Stainless steel hubs are available upon request.
Note 5 Torque ratings for the couplings are based on the physical limitations/failure point of the metal bellows. 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 metal bellows. Keyways are available to provide additional torque capacity in the shaft/hub connection when required. Please consult technical support for more assistance.
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