BK8
Metal Bellows Coupling with flange mounting for robot gears

50 - 2,600 Nm

BK8 METAL BELLOWS COUPLING WITH FLANGE MOUNTING FOR ROBOT GEARS

Specifications BK8

BK8 series 15 60 150 300 1500
Rated torque (Nm) TKN 15 60 150 300 1500
Robot flange centering diameter (mm)40h7 63h7 80h7 100h7 160h7
Robot flange bolt circle / thread Ø (mm)31.5
8x M5
50
8x M6
63
12x M6
80
12 M8
125
12x M10
Max. torque* (Nm)50 210 380 750 2600
Length (mm) A1 48.5 67 72 90 140
Length (mm) A2 68 97 101 128 190
Outher diameter (mm) B1 49 66 82 110 157
Flange diameter (mm) B2 63.5 86 108 132 188
Fit length (mm) C1 16.5 23 27.5 34 55
Inner diameter possible from Ø to Ø H7 (mm) D1 12-28 14-35 19-42 24-60 50-80
Inner diameter possible from Ø to Ø H7 (inch) D1 0,500"-
1,000"
0,625"-
1,375"
0,750"-
1,625"
1,000"-
2,250"
2,000"-
3,125"
Hub bolt circle (mm) DL 56.5 76 97 120 170
Fastening threads DL 10x M4 10x M5 10x M6 12x M6 16 x M8
Fastening screws ISO 4762 E1 1x M5 1x M8 1x M10 1x M12 2 x M20
Tightening torque (Nm) E1 8 45 80 120 470
Distance (mm) F 1x17.5 1x23 1x27 1x39 2x55
Distance (mm) G 6.5 9.5 11 13 22.5
Approx. weight (kg)0.3 0.7 1 2.8 10
Moment of interia (10-3 kgm2) Jges 0.15 0.65 1.3 5.5 45
Axial      (mm)max.1 1.5 2 2.5 3
Lateral   (mm)max.0.25 0.25 0.25 0.25 0.25
Angular (degrees)max.1 1 1 1 1
CAD Portal 15 60 150 300 1500
2D/3D Data 

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