Bellows couplings

The BK8 bellows coupling from R+W Couplings features a compact design and is equipped with a robot flange on one side for direct mounting. The coupling is very easy to assemble and disassemble. Thanks to the use of a friction clamp connection, this precision coupling is completely free from play. Thanks to the forcefully formed bellows, the element can simultaneously accommodate lateral, axial, and angular misalignments. Thanks to the forcefully formed bellows, the element can simultaneously accommodate lateral, axial, and angular misalignments. For specific inquiries about bellows couplings, please contact VARIODRIVE.

Robot flange and clamp hub
Nom. Torque
50-2600 Nm
up to 10,000 rpm
Temperature range
-30 to +100 oC
Bellows material
Hub material
Aluminum or steel
Intermediate flange material
Peak load
Up to 1.5 times the nominal value. Torque
No service
ATEX, Clean room version

  • Bestelcode instructies
  • ATEX instructies
  • Datasheet BK8
  • Manual BK/MK koppelingen
BK8 drawing
BK8 Series15601503001500
Inside diameter possible from Ø to Ø H7 (mm) DI12-2814-3519-4224-6050-80
Moment of inertia (10-3 kgm2) Jges.0,150,651,35,545
Approximate weight (kg) 0,30,712,810
Axial ± (mm)) max.11,522,53
Lateral ± (mm) max.0,250,250,250,250,25
Angular ± (degree) max.11111
Fastening screw (ISO 4762) El1xM51xM81xM101xM122xM20
Tightening torque of the clamping screw max. (Nm) El84580120470
Distance between centerlines (mm) 1x17,51x231x271x392x55
Distance (mm) G6,59,5111322,5
Mounting length (mm) Cl16,52327,53455
Flange centering diameter (mm) 40h763h780h7100h7160h7
Flange bolt circle / thread Ø (mm) 31,5 / 8x M550 / 8x M663 / 12x M680 / 12 M8125/ 12x M10
Maximum torque* (Nm) 502103807502600
Length (mm) A148,5677290140
Length -2 (mm) A26897101128190
Outside diameter of hub (mm) Bl496682110157
Flange outside diameter (mm) B2.63,586108132188
Bolt circle diameter (mm) DL56,57697120170
Thread (mm) DL10xM410xM510xM612xM616xM8
  • All
  • Datasheets
  • Manuals
  • Datasheets
  • Datasheets
  • Datasheets
  • Manuals
Did you not find the right information?
Frequently Asked Questions

You can place an order with VARIODRIVE by sending your request to orders@variodrive.nl. Your request will then be processed directly by our internal sales team.

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.

For most products on our website, you can download the 3D files. If the desired 3D file is not available, please contact sales@variodrive.nl, and we will send you the 3D file as soon as possible.

You can download the necessary configuration software for most products on our website. For a few products, this might not be possible. In such cases, please contact sales@variodrive.nl, and we will assist you as soon as possible.

Have you found everything you need?

© 2024 VARIODRIVE. All Rights Reserved.