BK4
Metal Bellows Coupling for tapered shafts

15 - 150 Nm

BK4 METAL BELLOWS COUPLING FOR TAPERED SHAFTS

Specifications BK4

BK4 series 15 30 60 150
Rated torque (Nm)TKN15 30 60 150
Overall length (mm)A-2
4754
6876
7282
8294
Outer diameter of bellow (mm)B49 55 66 81
Fit length (mm)C19 22 27 32
Inner diameter possible from Ø to Ø H7 (mm)D10-22 12-23 12-29 15-37
Inner diameter possible from Ø to Ø H7 (inch)D0,437"-
0,750"
0,500"-
0,875"
0,500"-
1,125"
0,625"-
1,375"
6 x Fastening screws
ISO 4017
E
M4 M5 M5 M6
Tighting torque of the
fastening screws (Nm)
E
4 6 8 12
3 x draw-off screw
ISO 4017
F
M4 M4 M5 M5
Shaft diameter (mm)G20 27 30 30
Shaft length (mm)H8.5 22 18 20
Mass moment of inertia (10-3 kgm2)Jges
0.100.12
0.220.27
0.580.61
1.11.4
approx. weight (kg)0.25 0.4 0.8 1.35
Torsional stiffness (103 Nm/rad)CT
2015
3928
7655
175110
Axial (mm)max.
12
12
1.52
23
Lateral (mm)max.
0.150.2
0.20.25
0.20.25
0.20.25
Axial spring stiffness (N/mm)Ca
2515
5030
7248
8252
lateral spring stiffness (N/mm)Cr
475137
900270
1200420
1500435
Cone Ø (Fanuc-Motor) (mm)I11 16 16 16
Keyway wide (mm)K4 5 5 5
CAD Portal 15 30 60 150
2D/3D Data 

Properties

  • Design: With tapered conical sleeves and strong, captive ISO 4017 draw-off screws.
  • Temperature range: -30° C to +100° C (-22° F to +212° F)
  • Backlash: Absolutely backlash-free due to frictional
clamp connection.
  • Service life: These couplings 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.
    • 
The hub material is steel.
  • Brief overload: Acceptable up to 1.5 times the value specified.
  • Speeds: Up to 10,000 rpm, in excess of 10,000 available with a finely balanced version.
  • Non-standard application:
    • Custom designs with varied tolerances
    • Keyways, non-standard material, bellows and ATEX designs are available upon request
  • Properties of Bellos Coupling model BK3:
    • high clamping forces
    • high degree of operating depentability
    • new draw off device suited for space restricted installations