The Timken Company
The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com
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    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.
BWC Series - Bellows Clamp Style Couplings - Metric
BWC Series - Bellows Clamp Style Couplings - Metric-2
Unit of Measure
Items BWC Series - Bellows Clamp Style Couplings - Metric
68514476989
BWC Series - Bellows Clamp Style Couplings - Inch (Imperial) Bores 		BWC Series - Bellows Clamp Style Couplings - Metric
68514476940
BWC Series - Bellows Clamp Style Couplings - Inch (Imperial) Bores 		BWC Series - Bellows Clamp Style Couplings - Metric
68514476992
BWC Series - Bellows Clamp Style Couplings - Inch (Imperial) Bores 		BWC Series - Bellows Clamp Style Couplings - Metric
68514476941
BWC Series - Bellows Clamp Style Couplings - Inch (Imperial) Bores 		BWC Series - Bellows Clamp Style Couplings - Metric
68514476944
BWC Series - Bellows Clamp Style Couplings - Inch (Imperial) Bores
Description  N/A BWC21-CP-1/4X1/4 N/A BWC21-CP-3/16X3/16 N/A BWC23-CP-1/4X1/4 N/A BWC23-CP-3/16X3/16 N/A BWC26-CP-1/4X1/4
Bore A N/A 0.250 in N/A 0.188 in N/A 0.250 in N/A 0.188 in N/A 0.250 in
Bore B N/A 0.250 in N/A 0.188 in N/A 0.250 in N/A 0.188 in N/A 0.250 in
Coupling Size N/A BWC21 N/A BWC21 N/A BWC23 N/A BWC23 N/A BWC26
Type N/A Standard Bellows Coupling
Overall Length N/A 0.827 in21.000 mm N/A 0.827 in21.000 mm N/A 0.906 in23.000 mm N/A 0.906 in23.000 mm N/A 1.024 in26.000 mm
Keyway Size N/A No Keyway
Outside Diameter N/A 0.591 in15.00 mm N/A 0.591 in15.00 mm N/A 0.591 in15.00 mm N/A 0.591 in15.00 mm N/A 0.748 in19.00 mm
Min. Bore (Dimensions ID1/ID2) N/A 0.118 in3.00 mm
Max. Bore (Dimensions ID1/ID2) N/A 0.256 in6.50 mm N/A 0.256 in6.50 mm N/A 0.256 in6.50 mm N/A 0.256 in6.50 mm N/A 0.394 in10.00 mm
Length thru Bore N/A 0.276 in7.00 mm N/A 0.276 in7.00 mm N/A 0.276 in7.00 mm N/A 0.276 in7.00 mm N/A 0.354 in9.00 mm
Bellows Material N/A Stainless Steel
Hub Material N/A Aluminum
Style N/A Clamp
Application N/A Motion Control
Clamp Screw Size N/A M2 N/A M2 N/A M2 N/A M2 N/A M2.5
Weight N/A 0.02 oz N/A 0.02 oz N/A 0.02 oz N/A 0.02 oz N/A 0.05 oz
Weight (Complete Coupling w/ Min. Bores) N/A 0.30 oz N/A 0.30 oz N/A 0.30 oz N/A 0.30 oz N/A 0.80 oz
Max. Operating Temperature N/A 212.00 ºF
Max. Speed N/A 15000 rpm
Nominal Torque N/A 3.54 in·lb N/A 3.54 in·lb N/A 7.97 in·lb N/A 7.97 in·lb N/A 13.28 in·lb
Angular Misalignment N/A 1.20 º
Axial Misalignment N/A 0.0090 in N/A 0.0090 in N/A 0.0080 in N/A 0.0080 in N/A 0.0100 in
Parallel Misalignment N/A 0.004 in
Moment of Inertia N/A 0.0090 lb·in² N/A 0.0090 lb·in² N/A 0.0090 lb·in² N/A 0.0090 lb·in² N/A 0.0380 lb·in²
Torsional Stiffness N/A 2248.00 in·lb/rad N/A 2248.00 in·lb/rad N/A 4487.00 in·lb/rad N/A 4487.00 in·lb/rad N/A 6620.00 in·lb/rad
Cubic inches N/A 0.28886 in³ N/A 0.28886 in³ N/A 0.31645 in³ N/A 0.31645 in³ N/A 0.57293 in³