Bellows couplings

The BKC bellows coupling from R+W Couplings has an economically interesting design and is easy to assemble due to clamping hubs. Its short length makes this coupler very suitable for installation in compact spaces. In addition, the BKC coupling possesses a low mass moment of inertia, can handle high speeds and by using friction clamp connection, this precision coupling is absolutely free of backlash. Thanks to its forced bellows shape, the element can simultaneously accommodate lateral, axial and angular misalignments. As long as they do not fall outside the maximum area, no metal fatigue will occur in the bellows material and the clutch is completely free of wear. For specific questions about bellows couplings, contact VARIODRIVE.

Compact clamp hub
Nom. Torque
15-500 Nm
up to 30,000 rpm
Temperature range
-30 to +100 oC
Bellows material
Hub material
Steel or Alu
Peak load
Up to 1.5x nom. Torque
No service
ATEX, clean room version
- Option 2
> 30,000 rpm with balanced version G = 2.5 (see table)
Customer-specific design, ATEX and cleanroom version on request

  • Bestelcode instructies
  • ATEX instructies
  • Datasheet BKC
  • Manual BK/MK koppelingen
BKC drawing
BKC Series153060150300 500
Rated torque (Nm)TKN153060150300500
Overall length (mm)A-24858677894100
Fit length (mm)c16,5212327,53434
Inside diameter possible from Ø to Ø H7 (mm)DI/D28-2812-3214-3519-4224-6032-75
Outside diameter (mm)B49566682110123
Moment of inertia (10kgm2)Jges.0,050,10,260,656,39
Approximate weight (kg)0,130,210,370,723,263,52
Torsional stiffness (10 3 Nm/rad)CT233172141157290
Axial (mm))max.111,5222,5
Latera ± (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)G6,57,59,5111313
Hub materialAluminiumAluminiumAluminiumAluminiumSteelSteel
Speed max. with G = 25 balancing (min-I)800007000060000500004000030000
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