BK8
Metal Bellows Coupling with flange mounting for robot gears

50 - 2,600 Nm

BK8 METAL BELLOWS COUPLING WITH FLANGE MOUNTING FOR ROBOT GEARS

BK8

Specifications BK8

BK8 Serien
Inside diameter possible from Ø to Ø H7 (mm)D1
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Fastening screw ISO 4762E1
Tightening torque of the clamping screw max. (Nm)E1
Distance between centerlines (mm)F
Distance (mm)G
Mounting length (mm)C1
Flange centering diameter (mm)
Flange bolt circle / thread Ø (mm)
Maximum torque* (Nm)
Length (mm)A1
Length -2 (mm)A2
Outside diameter of hub (mm)B1
Flange outside diameter (mm)B2
Bolt circle diameter (mm)DL
Thread (mm)DL
CAD Portal
BK8 Serien15
Inside diameter possible from Ø to Ø H7 (mm)
D112-28
Moment of inertia (10-3 kgm2)Jges.0,15
Approximate weight (kg)0,3
Axial ± (mm)max.1
Lateral ± (mm)max.0,25
Angular ± (degree)max.1
Fastening screw ISO 4762E11x M5
Tightening torque of the clamping screw max. (Nm)E18
Distance between centerlines (mm)F1x17,5
Distance (mm)G6,5
Mounting length (mm)C116,5
Flange centering diameter (mm)40h7
Flange bolt circle / thread Ø (mm)31,5 / 8x M5
Maximum torque* (Nm)50
Length (mm)A148,5
Length -2 (mm)A268
Outside diameter of hub (mm)B149
Flange outside diameter (mm)B263,5
Bolt circle diameter (mm)DL56,5
Thread (mm)DL10x M4
15
CAD
BK8 Serien
Inside diameter possible from Ø to Ø H7 (mm)D1
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Fastening screw ISO 4762E1
Tightening torque of the clamping screw max. (Nm)E1
Distance between centerlines (mm)F
Distance (mm)G
Mounting length (mm)C1
Flange centering diameter (mm)
Flange bolt circle / thread Ø (mm)
Maximum torque* (Nm)
Length (mm)A1
Length -2 (mm)A2
Outside diameter of hub (mm)B1
Flange outside diameter (mm)B2
Bolt circle diameter (mm)DL
Thread (mm)DL
CAD Portal
BK8 Serien60
Inside diameter possible from Ø to Ø H7 (mm)
D114-35
Moment of inertia (10-3 kgm2)Jges.0,65
Approximate weight (kg)0,7
Axial ± (mm)max.1,5
Lateral ± (mm)max.0,25
Angular ± (degree)max.1
Fastening screw ISO 4762E11x M8
Tightening torque of the clamping screw max. (Nm)E145
Distance between centerlines (mm)F1x23
Distance (mm)G9,5
Mounting length (mm)C123
Flange centering diameter (mm)63h7
Flange bolt circle / thread Ø (mm)50 / 8x M6
Maximum torque* (Nm)210
Length (mm)A167
Length -2 (mm)A297
Outside diameter of hub (mm)B166
Flange outside diameter (mm)B286
Bolt circle diameter (mm)DL76
Thread (mm)DL10x M5
60
CAD
BK8 Serien
Inside diameter possible from Ø to Ø H7 (mm)D1
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Fastening screw ISO 4762E1
Tightening torque of the clamping screw max. (Nm)E1
Distance between centerlines (mm)F
Distance (mm)G
Mounting length (mm)C1
Flange centering diameter (mm)
Flange bolt circle / thread Ø (mm)
Maximum torque* (Nm)
Length (mm)A1
Length -2 (mm)A2
Outside diameter of hub (mm)B1
Flange outside diameter (mm)B2
Bolt circle diameter (mm)DL
Thread (mm)DL
CAD Portal
BK8 Serien150
Inside diameter possible from Ø to Ø H7 (mm)
D119-42
Moment of inertia (10-3 kgm2)Jges.1,3
Approximate weight (kg)1
Axial ± (mm)max.2
Lateral ± (mm)max.0,25
Angular ± (degree)max.1
Fastening screw ISO 4762E11x M10
Tightening torque of the clamping screw max. (Nm)E180
Distance between centerlines (mm)F1x27
Distance (mm)G11
Mounting length (mm)C127,5
Flange centering diameter (mm)80h7
Flange bolt circle / thread Ø (mm)63 / 12x M6
Maximum torque* (Nm)380
Length (mm)A172
Length -2 (mm)A2101
Outside diameter of hub (mm)B182
Flange outside diameter (mm)B2108
Bolt circle diameter (mm)DL97
Thread (mm)DL10x M6
150
CAD
BK8 Serien
Inside diameter possible from Ø to Ø H7 (mm)D1
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Fastening screw ISO 4762E1
Tightening torque of the clamping screw max. (Nm)E1
Distance between centerlines (mm)F
Distance (mm)G
Mounting length (mm)C1
Flange centering diameter (mm)
Flange bolt circle / thread Ø (mm)
Maximum torque* (Nm)
Length (mm)A1
Length -2 (mm)A2
Outside diameter of hub (mm)B1
Flange outside diameter (mm)B2
Bolt circle diameter (mm)DL
Thread (mm)DL
CAD Portal
BK8 Serien300
Inside diameter possible from Ø to Ø H7 (mm)
D124-60
Moment of inertia (10-3 kgm2)Jges.5,5
Approximate weight (kg)2,8
Axial ± (mm)max.2,5
Lateral ± (mm)max.0,25
Angular ± (degree)max.1
Fastening screw ISO 4762E11x M12
Tightening torque of the clamping screw max. (Nm)E1120
Distance between centerlines (mm)F1x39
Distance (mm)G13
Mounting length (mm)C134
Flange centering diameter (mm)100h7
Flange bolt circle / thread Ø (mm)80 / 12 M8
Maximum torque* (Nm)750
Length (mm)A190
Length -2 (mm)A2128
Outside diameter of hub (mm)B1110
Flange outside diameter (mm)B2132
Bolt circle diameter (mm)DL120
Thread (mm)DL12x M6
300
CAD
BK8 Serien
Inside diameter possible from Ø to Ø H7 (mm)D1
Moment of inertia (10-3 kgm2)Jges.
Approximate weight (kg)
Axial ± (mm)max.
Lateral ± (mm)max.
Angular ± (degree)max.
Fastening screw ISO 4762E1
Tightening torque of the clamping screw max. (Nm)E1
Distance between centerlines (mm)F
Distance (mm)G
Mounting length (mm)C1
Flange centering diameter (mm)
Flange bolt circle / thread Ø (mm)
Maximum torque* (Nm)
Length (mm)A1
Length -2 (mm)A2
Outside diameter of hub (mm)B1
Flange outside diameter (mm)B2
Bolt circle diameter (mm)DL
Thread (mm)DL
CAD Portal
BK8 Serien1500
Inside diameter possible from Ø to Ø H7 (mm)
D150-80
Moment of inertia (10-3 kgm2)Jges.45
Approximate weight (kg)10
Axial ± (mm)max.3
Lateral ± (mm)max.0,25
Angular ± (degree)max.1
Fastening screw ISO 4762E12 x M20
Tightening torque of the clamping screw max. (Nm)E1470
Distance between centerlines (mm)F2x55
Distance (mm)G22,5
Mounting length (mm)C155
Flange centering diameter (mm)160h7
Flange bolt circle / thread Ø (mm)125 / 12x M10
Maximum torque* (Nm)2600
Length (mm)A1140
Length -2 (mm)A2190
Outside diameter of hub (mm)B1157
Flange outside diameter (mm)B2188
Bolt circle diameter (mm)DL170
Thread (mm)DL16 x M8
1500
CAD

Properties

  • Design:
    • One side with a clamping hub and a single radial clamping screw ISO 4762.
    • 
One side with a flange-connection and a seperate intermediate flange.
  • Temperature range: -30° C to +100° C (-22° F to +212° F)
  • Speed: Up to 10,000 rpm.
  • Service life: R+W Bellows Coupling BK7 are maintenance-free and have an infinite life,
if the technical ratings are not exceeded.
  • Fit tolerance: On the hub/shaft connection 0.01 to 0.05 mm.
  • Material:
    • The hubs are made of aluminium
    • Series 300
and 1500 made of steel
    • Bellows are made of
highly flexible, high-grade stainless steel
    • Intermediate flange made of steel (standard)
  • Non-standard application: Custom designs with varied tolerances, keyways, non-standard
material and bellows are available upon request.
  • Properties of Bellows Coupling model BK8:
    • zero backlash and high torsional rigidity
    • easy assembly
    • compact design
    • suited for space restricted installations


Overview