The BWC (Bellows Clamp) Series coupling provides a new range of coupling options with the high torsional stiffness. The higher torsional stiffness provides the benefit of accuracy and repeatability in motion control applications. The BWC series coupling features aluminum hubs and corrosion resistant steel bellow.

    The compact design also offers the benefit of low inertia. The BWC Series also has a torque capacity of up to 89 in-lbs, with a maximum bore capacity of .748 inches in diameter. The BWC utilizes clamping style hubs that provide easy installation and removal of the coupling. The bellows design also offers up to .016 inches of axial misalignment, with low reactionary loading on bearings.
Unit of Measure



N/A BWC32 CPLG 1/4X3/8

Coupling Size



N/A Standard Bellows Coupling

Bellows Material

N/A Stainless Steel

Hub Material

N/A Aluminum


N/A Clamp


N/A Motion Control


N/A 0.08 oz

Weight (Complete Coupling w/ Min. Bores)

N/A 1.30 oz

Dimensional Data

Bore A

N/A 0.250 in

Bore B

N/A 0.375 in

Overall Length

N/A 1.260 in32.00 mm

Keyway Size

N/A No Keyway

Outside Diameter

N/A 0.945 in24.00 mm

Min. Bore (Dimensions ID1/ID2)

N/A 0.118 in3.00 mm

Max. Bore (Dimensions ID1/ID2)

N/A 0.472 in12.00 mm

Length thru Bore

N/A 0.472 in12.00 mm

Clamp Screw Size

N/A M3

Cubic inches

N/A 1.12521 in³

Performance Data

Max. Operating Temperature

N/A 212.00 ºF

Max. Speed

N/A 15000 rpm

Nominal Torque

N/A 17.70 in·lb

Angular Misalignment

N/A 1.20 º

Axial Misalignment

N/A 0.0120 in

Parallel Misalignment

N/A 0.004 in

Moment of Inertia

N/A 0.0850 lb·in²

Torsional Stiffness

N/A 13541.00 in·lb/rad



  • High torsional stiffness
  • Low reactionary loading
  • No maintenance required
  • Low inertia



  • Nominal torque, torsional stiffness, weight and moment of inertia are based on minimum bore size.