Bellows couplings

The type BKM bellows coupling from R+W Couplings has an extremely short, compact design and can transmit high torque. This bellows coupling is easy to (dis)assemble. In addition, the BKM clutch possesses a low mass moment of inertia, can handle high speeds and by using friction clamp connection, this precision clutch 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.

Very compact clamping hub
Nom. Koppel
20-1000 Nm
up to 30,000 rpm
Temperatuur bereik
-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
Customer-specific design, ATEX and cleanroom version on request

  • Bestelcode instructies
  • ATEX instructies
  • Datasheet BKM
  • Manual BK/MK koppelingen
BKM drawing
BKM Series202004001000
Rated torque (Nm)TKN202004001000
Overall length (mm)A | 240597589
Fit length (mm)c16,52327,534
Inside diameter possible from Ø to Ø H7 (mm)DI/D215-2824-3532-4240-60
Outside diameter (mm)B496682110
Moment of intertia (10 3 kgm2)Jges.0,050,180,627,2
Approximate weight (kg)0,130,40,73,5
Torsional stiffness (103 Nm/rad)CT41,9138170570
Axial ± (mm))max.11,512
Lateral ± (mm)max.0,060,080,10,1
Angular ± (degree)max.0,50,50,50,5
Axial spring stiffness (N/mm)ca55,8153114148
Lateral spring stiffness (N/mm)cr37101100060589010
Fastening screw (ISO 4762)EM5M8M10M12
Tightening torque of the fastening screw (Nm)E84060130
Distance between centerlines (mm)F17232739
Distance (mm)G69,51113
Hub materialAluminiumAluminiumAluminiumSteel
Speed max. with G =25 balancing (min-I)80000600005000040000
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