BK3
Metal Bellows Coupling with tapered conical sleeves

15 - 10,000 Nm

BK3 METAL BELLOWS COUPLING WITH TAPERED CONICAL SLEEVES

BK3

Specifications BK3

BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien15
Rated torque (Nm)TKN15
Overall length (mm)A-248 | 55
Fit length (mm)C19
Inside diameter possible from Ø to Ø H7 (mm)
D1/210-22
Outside diameter (mm)B49
Moment of inertia (10-3 kgm2)Jges.0,07 | 0,08
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 | 1,5
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)G49
15
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien30
Rated torque (Nm)TKN30
Overall length (mm)A-257 | 65
Fit length (mm)C22
Inside diameter possible from Ø to Ø H7 (mm)
D1/212-23
Outside diameter (mm)B55
Moment of inertia (10-3 kgm2)Jges.0,15 | 0,16
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 | 1,5
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)G55
30
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien60
Rated torque (Nm)TKN60
Overall length (mm)A-266 | 76
Fit length (mm)C27
Inside diameter possible from Ø to Ø H7 (mm)
D1/212-29
Outside diameter (mm)B66
Moment of inertia (10-3 kgm2)Jges.0,39 | 0,41
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 | 1,5
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)G66
60
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien150
Rated torque (Nm)TKN150
Overall length (mm)A-275 | 87
Fit length (mm)C32
Inside diameter possible from Ø to Ø H7 (mm)
D1/215-38
Outside diameter (mm)B81
Moment of inertia (10-3 kgm2)Jges.1,2 | 1,6
Approximate weight (kg)1,2
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)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)G81
150
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien200
Rated torque (Nm)TKN200
Overall length (mm)A-278 | 90
Fit length (mm)C32
Inside diameter possible from Ø to Ø H7 (mm)
D1/215-44
Outside diameter (mm)B90
Moment of inertia (10-3 kgm2)Jges.1,7 | 2,5
Approximate weight (kg)1,8
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
Fastening screw ISO 4017E6 x M6
Tightening torque of the fastening screw (Nm)E14
Jack screw ISO 4017F3 x M6
Outside diameter of hub (mm)G90
200
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien300
Rated torque (Nm)TKN300
Overall length (mm)A-289 | 103
Fit length (mm)C41
Inside diameter possible from Ø to Ø H7 (mm)
D1/224-56
Outside diameter (mm)B110
Moment of inertia (10-3 kgm2)Jges.5,1 | 5,9
Approximate weight (kg)3
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
Fastening screw ISO 4017E6 x M8
Tightening torque of the fastening screw (Nm)E18
Jack screw ISO 4017F3 x M6
Outside diameter of hub (mm)G110
300
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien500
Rated torque (Nm)TKN500
Overall length (mm)A-297 | 110
Fit length (mm)C41
Inside diameter possible from Ø to Ø H7 (mm)
D1/224-60
Outside diameter (mm)B124
Moment of inertia (10-3 kgm2)Jges.9,1 | 9,9
Approximate weight (kg)4,2
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
Fastening screw ISO 4017E6 x M8
Tightening torque of the fastening screw (Nm)E25
Jack screw ISO 4017F3 x M6
Outside diameter of hub (mm)G122
500
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien800
Rated torque (Nm)TKN800
Overall length (mm)A-2114
Fit length (mm)C50
Inside diameter possible from Ø to Ø H7 (mm)
D1/230-60
Outside diameter (mm)B133
Moment of inertia (10-3 kgm2)Jges.13,2
Approximate weight (kg)5,6
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
Fastening screw ISO 4017E6 x M10
Tightening torque of the fastening screw (Nm)E40
Jack screw ISO 4017F3 x M8
Outside diameter of hub (mm)G116
800
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien1500
Rated torque (Nm)TKN1500
Overall length (mm)A-2141
Fit length (mm)C61
Inside diameter possible from Ø to Ø H7 (mm)
D1/235-70
Outside diameter (mm)B157
Moment of inertia (10-3 kgm2)Jges.34,9
Approximate weight (kg)8,2
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
Fastening screw ISO 4017E6 x M12
Tightening torque of the fastening screw (Nm)E70
Jack screw ISO 4017F6 x M8
Outside diameter of hub (mm)G135
1500
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien4000
Rated torque (Nm)TKN4000
Overall length (mm)A-2195
Fit length (mm)C80
Inside diameter possible from Ø to Ø H7 (mm)
D1/250-100
Outside diameter (mm)B200
Moment of inertia (10-3 kgm2)Jges.85,5
Approximate weight (kg)23
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
Fastening screw ISO 4017E6 x M16
Tightening torque of the fastening screw (Nm)E120
Jack screw ISO 4017F6 x M10
Outside diameter of hub (mm)G180
4000
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien6000
Rated torque (Nm)TKN6000
Overall length (mm)A-2210
Fit length (mm)C85
Inside diameter possible from Ø to Ø H7 (mm)
D1/260-140
Outside diameter (mm)B253
Moment of inertia (10-3 kgm2)Jges.254
Approximate weight (kg)32,6
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
Fastening screw ISO 4017E6 x M16
Tightening torque of the fastening screw (Nm)E150
Jack screw ISO 4017F6 x M10
Outside diameter of hub (mm)G246
6000
CAD
BK3 Serien
Rated torque (Nm)TKN
Overall length (mm)A-2
Fit length (mm)C
Inside diameter possible from Ø to Ø H7 (mm)
D1/2
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
CAD Portal
BK3 Serien10000
Rated torque (Nm)TKN10000
Overall length (mm)A-2217
Fit length (mm)C92
Inside diameter possible from Ø to Ø H7 (mm)
D1/270-180
Outside diameter (mm)B303
Moment of inertia (10-3 kgm2)Jges.629
Approximate weight (kg)45,5
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
Fastening screw ISO 4017E8 x M16
Tightening torque of the fastening screw (Nm)E160
Jack screw ISO 4017F8 x M10
Outside diameter of hub (mm)G295
10000
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