Bellows couplings

The type BKS bellows coupling from R+W Couplings is made entirely of stainless steel and can withstand high temperatures. The clamping hubs make the coupling easy to assemble. Its short length makes this coupler very suitable for installation in compact spaces. Thanks to its forced bellows shape, the element can simultaneously accommodate lateral, axial and angular misalignments. As long as these do not fall outside the maximum area, there will be no metal fatigue in the bellows material and this precision clutch is completely free of wear. For specific questions about bellows couplings, contact VARIODRIVE.

Stainless steel clamping hub
Nom. Torque
15-500 Nm
up to 10,000 rpm
Temperature range
-40 to +300 oC
Bellows material
Hub material
Peak load
Up to 1.5x nom. Torque
No service
ATEX, clean room version

  • Bestelcode instructies
  • ATEX instructies
  • Datasheet BKS
  • Manual BK/MK koppelingen
BKS drawing
BKS Series153060150300500
Rated torque (Nm)T KN153060150300500
Overall length (mm)A-2455266768995
Fit length (mm)C172024303435
Inside diameter* possible from Ø to Ø H7 (mm)DI/D212-2814-3216-3519-4224-6032-75
Outside diameter (mm)B49566682110123
Moment of inertia (10-3 kgm2)Jges.0,10,20,531,55,58,1
Approximate weight (kg)0,270,420,781,52,93,5
Torsional stiffness (10 3 Nm/rad)CT233172141157290
Axial ± (mm))max.111,5222,5
Lateral ± (mm)max.0,20,20,20,20,20,2
Angular ± (degree)max.111111
Axial spring stiffness (N/mm)ca3050677711272
Lateral spring stiffness (N/mm)cr31536667996029402200
Fastening screw (ISO 4762)EM5M6M8M10M12M12
Tightening torque of the fastening screw (Nm)E8154075120125
Distance between centerlines (mm)F17,52023273945
Distance (mm)G67,59,5111313
Speed max. with G = 25 balancing (min-I)600005050050000405004000030000
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By choosing VARIODRIVE’s complete solution, you won’t need to worry about integrating different drive components into the machine’s drive chain. We stand behind our complete solution and can guarantee its functionality.

Due to our in-depth knowledge of our products and their integration into applications, we can provide a system warranty. At that point, we guarantee that the application will function using our motion control and traction solutions.

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