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BKM | Precision Coupling

Clamping Hubs

The BKM coupling is designed with a single ISO 4762 radial clamping screw per hub.
This is an easy mount coupling with a high torque and low moment inertia rating for its size. It's compact form makes it ideal for applications where space is limited. It has a wide operating temperature range from -30 to 100 degrees Celsius. There is absolutely no backlash due to the frictional clamp type connection. These couplings have an infinite lifespan and are maintenance-free if the technical ratings are not exceeded.
The bellows are made of highly flexible high-grade
 stainless steel (See table for hub materials). R+W's BKM is made to operate at speeds up to 10,000 rpm, in excess of 30,000 available with a finely balanced version. Custom designs with varied tolerances, key-ways, non-standard material, bellows and ATEX designs are available upon request.
Self opening clamp system optional: Loosening the clamping screw applies force to the pin, which will force the clamp into the open position for easy mounting and dismounting.

PRECISION METAL BELLOWS COUPLING
WITH CLAMPING HUB

20-1000 NM

BKM Diagram

BKM Series Variants

*See above picture for reference

ItemTorque(Nm)Length (mm)Fit Length (mm)I.D. possible Ø - Ø H7 (mm)O.D. (mm)MomentInertiaWeight (kg)TorsionStiffnessAxial(mm)Lateral(mm)Angular(deg)AxialSpringStiffness(N/mm)LateralSpringStiffness(N/mm)Fastening screwTorque (Screw)Distance (mm) FDistance (mm) GHub Material
BKM-20204016,515-28490,050,1341,910,060,555,83710M58176Aluminium

BKM-200200592324-35660,180,41381,50,080,515311000M840239,5Aluminium

BKM-4004007527,532-42820,620,717010,10,51146058M10602711Aluminium

BKM-10001000893440-601107,23,557020,10,51489010M121303913Steel



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