BKC
Metal Bellows Coupling economy class compact version with clamping hub

15 - 500 Nm

BKC METAL BELLOWS COUPLING ECONOMY CLASS COMPACT VERSION WITH CLAMPING HUB

Specifications BKC

BKC series 15 30 60 150 300 500
Rated torque (Nm)TKN15 30 60 150 300 500
Overall length (mm)A-248 58 67 78 94 100
Outer diameter (mm)B49 56 66 82 110 123
Fit length (mm)C16.5 21 23 27.5 34 34
Inner diameter possible from Ø to Ø H7 (mm)D1/28-28 12-32 14-35 19-42 24-60 32-75
Inner diameter possible from Ø to Ø H7 (inch)D1/2M5 M6
M8
M10
M12
M12
Fastening screws
ISO 4762
E
8 15 40 75 120 125
Tightening torque of the fastening screw (Nm)E17.5 20 23 27 39 45
Distance between centers (mm)F6.5 7.5 9.5 11 13 13
Distance (mm)G0.05 0.1 0.26 0.65 6.3 9
Moment of inertia (10-3 kgm2)JgesAl Al Al Al Steel Steel
Hub material (standard) (steel on request)0.13 0.21 0.37 0.72 3.26 3.52
approx. weight (kg)CT23 31 72 141 157 290
Torsional stiffness (103 Nm/rad)CT1 1 1.5 2 2 2.5
axial (mm)max.0.2 0.2 0.2 0.2 0.2 0.2
lateral (mm)max.30 50 67 77 112 72
axial spring stiffness (N/mm)Ca315 366 679 960 2940 2200
lateral spring stiffness (N/mm)Cr1 1 1 1 1 1
Angular ± (grad) 80,000 70,000 60,000 50,000 40,000 30,000
Speed max. with G = 2.5 balancing (rpm) 
CAD Portal 15 30 60 150 300 500
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 BKC:
    • for high speeds
    • easy to mount
    • suited for space restricted installations
    • low moment of inertia

Overview