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 BWC41 CPLG 3/4X3/4

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 0.16 oz

Weight (Complete Coupling w/ Min. Bores)

N/A 2.60 oz

Dimensional Data

Bore A

N/A 0.750 in

Bore B

N/A 0.750 in

Overall Length

N/A 1.614 in41.000 mm

Keyway Size

N/A No Keyway

Outside Diameter

N/A 1.260 in32.00 mm

Min. Bore (Dimensions ID1/ID2)

N/A 0.236 in6 mm

Max. Bore (Dimensions ID1/ID2)

N/A 0.63 in16 mm

Length thru Bore

N/A 0.551 in14.00 mm

Clamp Screw Size

N/A M4

Cubic inches

N/A 2.56239 in³

Performance Data

Max. Operating Temperature

N/A 212.00 ºF

Max. Speed

N/A 15000 rpm

Nominal Torque

N/A 39.83 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 0.3350 lb·in²

Torsional Stiffness

N/A 57083.00 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.