BKM
Metal Bellows Coupling with clamping hub

20 - 1,000 Nm

BKM METAL BELLOWS COUPLING WITH CLAMPING HUB

Specifications BKM

BKM series 20 200 400 1000
Rated torque (Nm)TKN 20 200 400 1000
Overall length (mm)A-240 59 75 89
Outer diameter (mm)B49 66 82 110
Fit length (mm)C16.5 23 27.5 34
Inner diameter possible from Ø to Ø H7 (mm)D1/2 15-28 24-35 32-42 40-60
Fastening screws
ISO 4762
E
M5
M8 M10
M12
Tighting torque of the fastening
screw (Nm)
E
8 40 60 130
Distance between centers (mm)F17 23 27 39
Distance (mm)G6 9.5 11 13
Moment of inertia (10-3 kgm2)Jges0.05 0.18 0.62 7.2
Hub material (standard) (steel on request)Al Al Al Steel
approx. weight (kg)0.13 0.4 0.7 3.5
Torsional stiffness (103 Nm/rad)CT41.9 138 170 570
axial (mm)max.1 1.5 1 2
lateral (mm)max. 0.06 0.08 0.1 0.1
Angular (degrees)max.0.5 0.5 0.5 0.5
axial spring stiffness (N/mm)Ca55.8 153 114 148
lateral spring stiffness (N/mm)Cr3710 11000 6058 9010
Speed max. with G=2.5 balancing (rpm)80,000 60,000 50,000 40,000
CAD Portal 20 200 400 1000
2D/3D Data 

Properties

  • Design:
    • With a single ISO 4762 radial clamping screw per hub.
    • Self opening clamp system optional: Loosening the clamping screw applies force to the pin, which will force the clamp into the open position for easy mounting and dismounting.
  • Temperature range: -30° C to +100° C (-22° F to +212° F)
  • Backlash: Absolutely backlash-free due to frictional clamped connection.
  • Service life: These couplings have an infinite life and are maintenance-free if the technical ratings are not exceeded.
  • Tolerance: On the hub/shaft connection 0.01 to 0.05 mm.
  • Material:
    • Bellows made of highly flexible high-grade
stainless steel.
    • Hub material see table.
  • Speeds: Standard up to 10,000
Option
    • 1: In excess of 10,000 rpm with a finely balanced version
Option
    • 2: in excess of 30,000 rpm, with balancing grade G = 2.5 (see table)
  • Non-standard application:
    • Custom designs with varied tolerances, keyways, non-standard material, bellows and ATEX designs are available upon request.
  • Properties of Bellows Coupling model BKM:
    • compact design for high torques
    • easy to mount
    • suited for space restricted installations
    • low moment of inertia

Overview