BKL
Metal Bellows Coupling Economy Class with clamping hub

2 - 500 Nm

BKL METAL BELLOWS COUPLING ECONOMY CLASS WITH CLAMPING HUB

Specifications BKL

BKL series 2 4,5 10 15 30 60 80 150 300 500
Rated torque (Nm)TKN 2 4.5 10 15 30 60 80 150 300 500
Overall length (mm) A-2 30 40 44 58 68 79 92 92 109 114
Outer diameter (mm) B 25 32 40 49 56 66 82 82 110 123
Fit length (mm) C 10.5 13 13 21.5 26 28 32.5 32.5 41 42.5
Inner diameter possible
from Ø to Ø H7 (mm)
D1/2
4-12.7 6-16 6-24 8-28 10-32 14-35 16-42 19-42 24-60 35-62
Inner diameter possible
from Ø to Ø H7 (inch)
D1/2
M3
M4 M4 M5
M6
M8
M10
M10
M12
M16
Fastening screws
ISO 4762
E
2.3 4 4.5 8 15 40 70 85 120 200
Tightening torque
of the fastening screw (Nm)
E
8 11 14 17 20 23 27 27 39 41
Distance between centers (mm) F 4 5 5 6.5 7.5 9.5 11 11 13 17
Distance (mm) G 0.002 0.007 0.016 0.065 0.12 0.3 0.75
1.80.8
7.53.1
11.74.9
Mass moment of inertia (10-3 kgm2) JgesAl
optional Steel
Al
optional Steel
Al
optional Steel
Al
optional Steel
Al
optional Steel
Al
optional Steel
Al
optional Steel
Steel
optional Al
Steel
optional Al
Steel
optional Al
Hub material (standard) (steel on request)0.02 0.05 0.06 0.16 0.25 0.4 0.7
1.70.75
3.81.6
4.92.1
Approx. weight (kg)CT1.5 7 9 23 31 72 80 141 157 290
Torsional stiffness (103 Nm/rad) CT 0.5 1 1 1 1 1.5 2 2 2 2.5
Axial ±(mm) max. 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
Lateral ±(mm) max. 1 1 1 1 1 1 1 1 1 1
Angular± (grad)Ca8 35 30 30 50 67 44 77 112 72
Axial spring stiffness (N/mm) Ca 50 350 320 315 366 679 590 960 2940 1450
Lateral spring stiffness (N/mm) Cr
CAD Portal 2 4,5 10 15 30 60 80 150 300 500
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: Up to 10,000 rpm, in excess of 10,000 with
a finely balanced version.
  • Non-standard applications: Custom designs with varied tolerances, keyways, non-standard material,
bellows and ATEX designs are available upon request.
  • Properties of Bellows Coupling model BKL:
    • economically priced
    • low moment of inertia
    • easy to mount

Overview