BKM
Metal Bellows Coupling with clamping hub

20 - 1,000 Nm

BKM METAL BELLOWS COUPLING WITH CLAMPING HUB

BKM

Specifications BKM

BKM Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/D2
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 4762E
Tightening torque of the fastening screw (Nm)E
Distance between centerlines (mm)F
Distance (mm)G
Hub material
Speed max. with G = 2.5 balancing (min-1)
CAD Portal
BKM Serien20
Rated torque (Nm)TKN20
Overall length (mm)A-240
Fit length (mm)C16,5
Inside diameter possible from Ø to Ø H7 (mm)
D1/D215-28
Outside diameter (mm)B49
Moment of inertia (10-3 kgm2)Jges.0,05
Approximate weight (kg)0,13
Torsional stiffness (10³ Nm/rad)CT41,9
Axial ± (mm))max.1
Lateral ± (mm)max.0,06
Angular ± (degree)max.0,5
Axial spring stiffness (N/mm)Ca55,8
Lateral spring stiffness (N/mm)Cr3710
Fastening screw ISO 4762EM5
Tightening torque of the fastening screw (Nm)E8
Distance between centerlines (mm)F17
Distance (mm)G6
Hub materialAluminium
Speed max. with G = 2.5 balancing (min-1)80000
20
CAD
BKM Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/D2
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 4762E
Tightening torque of the fastening screw (Nm)E
Distance between centerlines (mm)F
Distance (mm)G
Hub material
Speed max. with G = 2.5 balancing (min-1)
CAD Portal
BKM Serien200
Rated torque (Nm)TKN200
Overall length (mm)A-259
Fit length (mm)C23
Inside diameter possible from Ø to Ø H7 (mm)
D1/D224-35
Outside diameter (mm)B66
Moment of inertia (10-3 kgm2)Jges.0,18
Approximate weight (kg)0,4
Torsional stiffness (10³ Nm/rad)CT138
Axial ± (mm))max.1,5
Lateral ± (mm)max.0,08
Angular ± (degree)max.0,5
Axial spring stiffness (N/mm)Ca153
Lateral spring stiffness (N/mm)Cr11000
Fastening screw ISO 4762EM8
Tightening torque of the fastening screw (Nm)E40
Distance between centerlines (mm)F23
Distance (mm)G9,5
Hub materialAluminium
Speed max. with G = 2.5 balancing (min-1)60000
200
CAD
BKM Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/D2
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 4762E
Tightening torque of the fastening screw (Nm)E
Distance between centerlines (mm)F
Distance (mm)G
Hub material
Speed max. with G = 2.5 balancing (min-1)
CAD Portal
BKM Serien400
Rated torque (Nm)TKN400
Overall length (mm)A-275
Fit length (mm)C27,5
Inside diameter possible from Ø to Ø H7 (mm)
D1/D232-42
Outside diameter (mm)B82
Moment of inertia (10-3 kgm2)Jges.0,62
Approximate weight (kg)0,7
Torsional stiffness (10³ Nm/rad)CT170
Axial ± (mm))max.1
Lateral ± (mm)max.0,1
Angular ± (degree)max.0,5
Axial spring stiffness (N/mm)Ca114
Lateral spring stiffness (N/mm)Cr6058
Fastening screw ISO 4762EM10
Tightening torque of the fastening screw (Nm)E60
Distance between centerlines (mm)F27
Distance (mm)G11
Hub materialAluminium
Speed max. with G = 2.5 balancing (min-1)50000
400
CAD
BKM Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/D2
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 4762E
Tightening torque of the fastening screw (Nm)E
Distance between centerlines (mm)F
Distance (mm)G
Hub material
Speed max. with G = 2.5 balancing (min-1)
CAD Portal
BKM Serien1000
Rated torque (Nm)TKN1000
Overall length (mm)A-289
Fit length (mm)C34
Inside diameter possible from Ø to Ø H7 (mm)
D1/D240-60
Outside diameter (mm)B110
Moment of inertia (10-3 kgm2)Jges.7,2
Approximate weight (kg)3,5
Torsional stiffness (10³ Nm/rad)CT570
Axial ± (mm))max.2
Lateral ± (mm)max.0,1
Angular ± (degree)max.0,5
Axial spring stiffness (N/mm)Ca148
Lateral spring stiffness (N/mm)Cr9010
Fastening screw ISO 4762EM12
Tightening torque of the fastening screw (Nm)E130
Distance between centerlines (mm)F39
Distance (mm)G13
Hub materialSteel
Speed max. with G = 2.5 balancing (min-1)40000
1000
CAD

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