BK1
Metal Bellows Couplings with flange mounting for special design application

15 - 10,000 Nm

BK1 METAL BELLOWS COUPLINGS WITH FLANGE MOUNTING FOR SPECIAL DESIGN APPLICATION

BK1

Specifications BK1

BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien15
Rated torque (Nm)TKN15
Overall length (mm)A-230 | 37
Outside diameter of bellows (mm)B49
Fit length/thread depth (mm)C7,5
Inside diameter H7 (mm)D25
Fastening threadsE6 x M5
Bolt circle diameter ± 0.2 (mm)F35
Outside diameter f7 (mm)G49
Moment of inertia (10-3 kgm2)Jges.0,07 | 0,08
Approximate weight (kg)0,15
Torsional stiffness (10³ Nm/rad)CT20|15
Axial ± (mm))max.1 | 2
Lateral ± (mm)max.0,15 | 0,2
Angular ± (degree)max.1 | 1,5
Axial spring stiffness (N/mm)Ca25 | 15
Lateral spring stiffness (N/mm)Cr475|137
15
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien30
Rated torque (Nm)TKN30
Overall length (mm)A-236 | 44
Outside diameter of bellows (mm)B55
Fit length/thread depth (mm)C10
Inside diameter H7 (mm)D28
Fastening threadsE6 x M5
Bolt circle diameter ± 0.2 (mm)F37
Outside diameter f7 (mm)G55
Moment of inertia (10-3 kgm2)Jges.0,14 | 0,15
Approximate weight (kg)0,2
Torsional stiffness (10³ Nm/rad)CT39|28
Axial ± (mm))max.1 | 2
Lateral ± (mm)max.0,2 | 0,25
Angular ± (degree)max.1 | 1,5
Axial spring stiffness (N/mm)Ca50 | 30
Lateral spring stiffness (N/mm)Cr900|270
30
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien60
Rated torque (Nm)TKN60
Overall length (mm)A-243 | 53
Outside diameter of bellows (mm)B66
Fit length/thread depth (mm)C11
Inside diameter H7 (mm)D38
Fastening threadsE6 x M6
Bolt circle diameter ± 0.2 (mm)F46
Outside diameter f7 (mm)G66
Moment of inertia (10-3 kgm2)Jges.0,30 | 0,32
Approximate weight (kg)0,3
Torsional stiffness (10³ Nm/rad)CT76|55
Axial ± (mm))max.1,5 | 2
Lateral ± (mm)max.0,2 | 0,25
Angular ± (degree)max.1 | 1,5
Axial spring stiffness (N/mm)Ca72 | 48
Lateral spring stiffness (N/mm)Cr1200|420
60
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien150
Rated torque (Nm)TKN150
Overall length (mm)A-250 | 62
Outside diameter of bellows (mm)B81
Fit length/thread depth (mm)C13
Inside diameter H7 (mm)D50
Fastening threadsE6 x M6
Bolt circle diameter ± 0.2 (mm)F62
Outside diameter f7 (mm)G81
Moment of inertia (10-3 kgm2)Jges.0,90 | 0,95
Approximate weight (kg)0,6
Torsional stiffness (10³ Nm/rad)CT175|110
Axial ± (mm))max.2 | 3
Lateral ± (mm)max.0,2 | 0,25
Angular ± (degree)max.1 | 1,5
Axial spring stiffness (N/mm)Ca82 | 52
Lateral spring stiffness (N/mm)Cr1550|435
150
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien200
Rated torque (Nm)TKN200
Overall length (mm)A-253 | 65
Outside diameter of bellows (mm)B90
Fit length/thread depth (mm)C14,5
Inside diameter H7 (mm)D58
Fastening threadsE6 x M6
Bolt circle diameter ± 0.2 (mm)F70
Outside diameter f7 (mm)G90
Moment of inertia (10-3 kgm2)Jges.1,30 | 1,40
Approximate weight (kg)0,8
Torsional stiffness (10³ Nm/rad)CT191|140
Axial ± (mm))max.2 | 3
Lateral ± (mm)max.0,25 | 0,3
Angular ± (degree)max.1 | 1,5
Axial spring stiffness (N/mm)Ca90 | 60
Lateral spring stiffness (N/mm)Cr2040|610
200
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien300
Rated torque (Nm)TKN300
Overall length (mm)A-256 | 70
Outside diameter of bellows (mm)B110
Fit length/thread depth (mm)C15
Inside diameter H7 (mm)D65
Fastening threadsE6 x M8
Bolt circle diameter ± 0.2 (mm)F80
Outside diameter f7 (mm)G110
Moment of inertia (10-3 kgm2)Jges.1,95 | 2,10
Approximate weight (kg)1,35
Torsional stiffness (10³ Nm/rad)CT450|350
Axial ± (mm))max.2,5 | 3,5
Lateral ± (mm)max.0,25 | 0,3
Angular ± (degree)max.1 | 1,5
Axial spring stiffness (N/mm)Ca105 | 71
Lateral spring stiffness (N/mm)Cr3750|1050
300
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien500
Rated torque (Nm)TKN500
Overall length (mm)A-264 | 77
Outside diameter of bellows (mm)B124
Fit length/thread depth (mm)C16
Inside diameter H7 (mm)D70
Fastening threadsE6 x M8
Bolt circle diameter ± 0.2 (mm)F94
Outside diameter f7 (mm)G122
Moment of inertia (10-3 kgm2)Jges.3,0 | 3,4
Approximate weight (kg)1,8
Torsional stiffness (10³ Nm/rad)CT510|500
Axial ± (mm))max.2,5 | 3,5
Lateral ± (mm)max.0,3 | 0,35
Angular ± (degree)max.1 | 1,5
Axial spring stiffness (N/mm)Ca70 | 48
Lateral spring stiffness (N/mm)Cr2500|840
500
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien800
Rated torque (Nm)TKN800
Overall length (mm)A-281
Outside diameter of bellows (mm)B133
Fit length/thread depth (mm)C18
Inside diameter H7 (mm)D75
Fastening threadsE6 x M10
Bolt circle diameter ± 0.2 (mm)F90
Outside diameter f7 (mm)G116
Moment of inertia (10-3 kgm2)Jges.4,3
Approximate weight (kg)1,9
Torsional stiffness (10³ Nm/rad)CT780
Axial ± (mm))max.3,5
Lateral ± (mm)max.0,35
Angular ± (degree)max.1,5
Axial spring stiffness (N/mm)Ca100
Lateral spring stiffness (N/mm)Cr2000
800
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien1500
Rated torque (Nm)TKN1500
Overall length (mm)A-2100
Outside diameter of bellows (mm)B157
Fit length/thread depth (mm)C22
Inside diameter H7 (mm)D85
Fastening threadsE6 x M16
Bolt circle diameter ± 0.2 (mm)F110
Outside diameter f7 (mm)G140
Moment of inertia (10-3 kgm2)Jges.10,6
Approximate weight (kg)3,3
Torsional stiffness (10³ Nm/rad)CT1304
Axial ± (mm))max.3,5
Lateral ± (mm)max.0,35
Angular ± (degree)max.1,5
Axial spring stiffness (N/mm)Ca320
Lateral spring stiffness (N/mm)Cr3600
1500
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien4000
Rated torque (Nm)TKN4000
Overall length (mm)A-2145
Outside diameter of bellows (mm)B200
Fit length/thread depth (mm)C30
Inside diameter H7 (mm)D100
Fastening threadsE6 x M20
Bolt circle diameter ± 0.2 (mm)F140
Outside diameter f7 (mm)G182
Moment of inertia (10-3 kgm2)Jges.46
Approximate weight (kg)8,9
Torsional stiffness (10³ Nm/rad)CT3400
Axial ± (mm))max.3,5
Lateral ± (mm)max.0,4
Angular ± (degree)max.1,5
Axial spring stiffness (N/mm)Ca565
Lateral spring stiffness (N/mm)Cr6070
4000
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien6000
Rated torque (Nm)TKN6000
Overall length (mm)A-2138
Outside diameter of bellows (mm)B253
Fit length/thread depth (mm)C30
Inside diameter H7 (mm)D145
Fastening threadsE8 x M20
Bolt circle diameter ± 0.2 (mm)F190
Outside diameter f7 (mm)G235
Moment of inertia (10-3 kgm2)Jges.132
Approximate weight (kg)13,9
Torsional stiffness (10³ Nm/rad)CT5700
Axial ± (mm))max.3
Lateral ± (mm)max.0,4
Angular ± (degree)max.1,5
Axial spring stiffness (N/mm)Ca1030
Lateral spring stiffness (N/mm)Cr19200
6000
CAD
BK1 Series
Rated torque (Nm)TKN
Overall length (mm)A-2
Outside diameter of bellows (mm)B
Fit length/thread depth (mm)C
Inside diameter H7 (mm)
D
Fastening threadsE
Bolt circle diameter ± 0.2 (mm)F
Outside diameter f7 (mm)G
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
CAD Portal
BK1 Serien10000
Rated torque (Nm)TKN10000
Overall length (mm)A-2150
Outside diameter of bellows (mm)B303
Fit length/thread depth (mm)C36
Inside diameter H7 (mm)D190
Fastening threadsE8 x M24
Bolt circle diameter ± 0.2 (mm)F234
Outside diameter f7 (mm)G295
Moment of inertia (10-3 kgm2)Jges.350
Approximate weight (kg)23,7
Torsional stiffness (10³ Nm/rad)CT10950
Axial ± (mm))max.3
Lateral ± (mm)max.0,4
Angular ± (degree)max.1,5
Axial spring stiffness (N/mm)Ca985
Lateral spring stiffness (N/mm)Cr21800
10000
CAD

Properties

  • Design:
    • The hubs have six threaded metric mounting holes
    • The ID and OD are concentrically machined to ISO H7 tolerances
    • Hubs with custom bore size, mounting threads and bolt circles are available upon request
  • Temperature range: -30° C to +120° C (-22° F to +212° F)
  • Blacklash: Absolutely backlash-free due to bolted connection.
  • Service life: These couplings are maintenance-free if the technical limits are not exceeded.
  • Material:
    • Bellows made of highly flexible high grade stainless steel
    • hub material: steel
  • Brief overloads: Acceptable up to 1.5 times the value specified.
  • Speeds: Up to 10,000 rpm in excess of 10,000 with finely balanced version
  • Non-standard application: Custom designs with varied tolerances, keyways, non-standart material, bellows and ATEX designs are available upon request.
  • Properties of Bellows Coupling BK1:
    • special design application


Overview