Bellows couplings

The BKL bellows coupling type from R+W Couplings is the “economy” variant of the BK2 and is easy to assemble due to clamping hubs. In addition, the BKL coupling possesses a low mass moment of inertia and this precision coupling is absolutely free of backlash due to the use of friction clamp connection. 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.

Nom. Torque
15-10.000 Nm
up to 10,000 rpm
Temperature range
-30 to +100 oC
Bellows material
Steel or Alu
Up to 1.5x nom. Torque
No service
ATEX, clean room version

  • Bestelcode instructies
  • ATEX instructies
  • Datasheet BKL
  • Manual BK/MK koppelingen
BKL drawing
Rated torque (Nm)TKN24,51015306080150300500
Overall length (mm)A | 23040445868799292109114
Fit length (mm)c10,5131321,5262832,532,54142,5
Inside diameter possible from Ø to Ø H7 (mm)DI/D24-12,76-166-248-2810-3214-3516-4219-4224-6035-62
Outside diameter (mm)B2532404956668282110123
Moment of inertia | (10 -3 kgm2)Jges0,0020,0070,0160,0650,120,30,751,8 | 0,87,5 | 3,111,7 | 4,9
Approximate weight (kg)0,020,050,060,160,250,40,71,7 | 0,753,8 | 1,64,9 | 2,1
Torsional stiffness (103 Nm/rad)CT1,57923317280141157290
Axial ± (mm))max.0,511111,52222,5
Lateral ± (mm)max.0,20,20,20,20,20,20,20,20,20,2
Angular ± (degree)max.1111111111
Axial spring stiffness (N/mm)ca83530305067447711272
Lateral spring stiffness (N/mm)cr5035032031536667959096029401450
Fastening screw (ISO 4762)EM3M4M4M5M6M8M10M0M12M16
Tightening torque of the fastening screw (Nm)E2,344,5815407085120200
Distance between centerlines (mm)F8111417202327273941
Distance (mm)G4556,57,59,511111317
Hub materialAluminium optional SteelAluminium optional SteelAluminium optional SteelAluminium optional SteelAluminium optional SteelAluminium optional SteelAluminium optional SteelSteel optional AluminiumSteel optional AluminiumSteel optional Aluminium
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Frequently Asked Questions

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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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