BK4
Metal Bellows Coupling for tapered shafts

15 - 150 Nm

BK4 METAL BELLOWS COUPLING FOR TAPERED SHAFTS

BK4

Specifications BK4

BK4 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter range H7 (mm)D
Outside diameter (mm)B
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Torsional stiffness (10³ Nm/rad)CT
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Axial spring stiffness (N/mm)Ca
Lateral spring stiffness (N/mm)Cr
Fastening screw ISO 4017E
Tightening torque of the fastening screw (Nm)E
Jack screw ISO 4017F
Outside diameter of hub (mm)G
Hub length (mm)H
Cone Ø (Fanuc-Motor) (mm)I
Key width (mm)K
CAD Portal
BK4 Serien15
Rated torque (Nm)TKN15
Overall length (mm)A-247 | 54
Fit length (mm)C19
Inside diameter range H7 (mm)D10-22
Outside diameter (mm)B49
Moment of inertia (10-3 kgm2)Jges.0,10 | 0,12
Approximate weight (kg)0,25
Torsional stiffness (10³ Nm/rad)CT20 | 15
Axial ± (mm)max.1 | 2
Lateral ± (mm)max.0,15 | 0,2
Angular ± (degree)max.1 | 2
Axial spring stiffness (N/mm)Ca25 | 15
Lateral spring stiffness (N/mm)Cr475 | 137
Fastening screw ISO 4017E6 x M4
Tightening torque of the fastening screw (Nm)E4
Jack screw ISO 4017F3 x M4
Outside diameter of hub (mm)G20
Hub length (mm)H8,5
Cone Ø (Fanuc-Motor) (mm)I11
Key width (mm)K4
15
CAD
BK4 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter range H7 (mm)D
Outside diameter (mm)B
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Torsional stiffness (10³ Nm/rad)CT
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Axial spring stiffness (N/mm)Ca
Lateral spring stiffness (N/mm)Cr
Fastening screw ISO 4017E
Tightening torque of the fastening screw (Nm)E
Jack screw ISO 4017F
Outside diameter of hub (mm)G
Hub length (mm)H
Cone Ø (Fanuc-Motor) (mm)I
Key width (mm)K
CAD Portal
BK4 Serien30
Rated torque (Nm)TKN30
Overall length (mm)A-268 | 76
Fit length (mm)C22
Inside diameter range H7 (mm)D12-23
Outside diameter (mm)B55
Moment of inertia (10-3 kgm2)Jges.0,22 | 0,27
Approximate weight (kg)0,4
Torsional stiffness (10³ Nm/rad)CT39 | 28
Axial ± (mm)max.1 | 2
Lateral ± (mm)max.0,2 | 0,25
Angular ± (degree)max.1 | 2
Axial spring stiffness (N/mm)Ca50 | 30
Lateral spring stiffness (N/mm)Cr900 | 270
Fastening screw ISO 4017E6 x M5
Tightening torque of the fastening screw (Nm)E6
Jack screw ISO 4017F3 x M4
Outside diameter of hub (mm)G27
Hub length (mm)H22
Cone Ø (Fanuc-Motor) (mm)I16
Key width (mm)K5
30
CAD
BK4 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter range H7 (mm)D
Outside diameter (mm)B
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Torsional stiffness (10³ Nm/rad)CT
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Axial spring stiffness (N/mm)Ca
Lateral spring stiffness (N/mm)Cr
Fastening screw ISO 4017E
Tightening torque of the fastening screw (Nm)E
Jack screw ISO 4017F
Outside diameter of hub (mm)G
Hub length (mm)H
Cone Ø (Fanuc-Motor) (mm)I
Key width (mm)K
CAD Portal
BK4 Serien60
Rated torque (Nm)TKN60
Overall length (mm)A-272 | 82
Fit length (mm)C27
Inside diameter range H7 (mm)D12-29
Outside diameter (mm)B66
Moment of inertia (10-3 kgm2)Jges.0,58 | 0,61
Approximate weight (kg)0,8
Torsional stiffness (10³ Nm/rad)CT76 | 55
Axial ± (mm)max.1,5 | 2
Lateral ± (mm)max.0,2 | 0,25
Angular ± (degree)max.1,5 | 2
Axial spring stiffness (N/mm)Ca72 | 48
Lateral spring stiffness (N/mm)Cr1200 | 420
Fastening screw ISO 4017E6 x M5
Tightening torque of the fastening screw (Nm)E8
Jack screw ISO 4017F3 x M5
Outside diameter of hub (mm)G30
Hub length (mm)H18
Cone Ø (Fanuc-Motor) (mm)I16
Key width (mm)K5
60
CAD
BK4 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter range H7 (mm)D
Outside diameter (mm)B
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Torsional stiffness (10³ Nm/rad)CT
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Axial spring stiffness (N/mm)Ca
Lateral spring stiffness (N/mm)Cr
Fastening screw ISO 4017E
Tightening torque of the fastening screw (Nm)E
Jack screw ISO 4017F
Outside diameter of hub (mm)G
Hub length (mm)H
Cone Ø (Fanuc-Motor) (mm)I
Key width (mm)K
CAD Portal
BK4 Serien150
Rated torque (Nm)TKN150
Overall length (mm)A-282 | 94
Fit length (mm)C32
Inside diameter range H7 (mm)D15-37
Outside diameter (mm)B81
Moment of inertia (10-3 kgm2)Jges.1,1 | 1,4
Approximate weight (kg)1,35
Torsional stiffness (10³ Nm/rad)CT175 | 110
Axial ± (mm)max.2 | 3
Lateral ± (mm)max.0,2 | 0,25
Angular ± (degree)max.2 | 3
Axial spring stiffness (N/mm)Ca82 | 52
Lateral spring stiffness (N/mm)Cr1500 | 435
Fastening screw ISO 4017E6 x M6
Tightening torque of the fastening screw (Nm)E12
Jack screw ISO 4017F3 x M5
Outside diameter of hub (mm)G30
Hub length (mm)H20
Cone Ø (Fanuc-Motor) (mm)I16
Key width (mm)K5
150
CAD

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


Overview