BK2
Metal Bellows Coupling with clamping hub

15 - 10,000 Nm

BK2 METAL BELLOWS COUPLING WITH CLAMPING HUB

Specifications BK2

BK2 series 15 30 60 80 150 200 300 500 800 1500 4000 6000 10000
Rated torque (Nm) TKN 15 30 60 80 150 200 300 500 800 1500 4000 6000 10000
Overall length (mm) A-2
596699
6977113
8393130
94106143
95107144
105117163
111125200
133146169
140179
166230
225 252 288
Outside diameter (mm) B 49 55 66 81 81 90 110 124 134 157 200 253 303
Fit length (mm) C 22 27 31 36 36 41 43 51 45 55 85 107 129
Inside diameter possible from Ø to Ø H7 (mm) D1/28-28 10-30 12-35 14-42 19-42 22-45 24-60 35-60 40-75 50-80 50-90 60-140 70-180
Inside diameter possible from Ø to Ø H7 (inch) D1/2 0,375"-
1,000"
0,437"-
1,125"
0,500"-
1,375"
0,550"-
1,625"
0,750"-
1,625"
0,875"-
1,750"
1,000"-
2,250"
1,500"-
2,250"
1,625"-
2,875"
2,000"-
3,125"
2,000"-
3,500"
2,375"-
5,500"
2.812"-
7,000"
Fastening screws
ISO 4762
E
M5 M6 M8 M10 M10 M12 M12 M16 2x M16 2x M20 2x M24 2x M24 2x M30
Tightening torque of the
fastening screw (Nm)
E
8 15 40 50 70 120 130 200 250 470 1200 1200 2400
Distance between centerlines (mm)F17 19 23 27 27 31 39 41 2x48 2x55 2x65 2x90 2x117
Distance (mm) G 6.5 7.5 9.5 11 11 12.5 13 16.5 18 22.5 28 35 42
Moment of inertia (10-3 kgm2) Jges
0.060.070.08
0.120.130.14
0.320.350.4
0.80.850.9
1.922.1
3.23.43.6
7.67.98.3
14.314.614.8
16.217
4345
165 495 1214
Hub material (standard) (steel on request)Al
optional Steel
Al
optional Steel
Al
optional Steel
Al
optional Steel
Steel
optional AL
Steel
optional AL
Steel
optional AL
Steel
optional AL
Steel Steel Steel Steel Steel
approx. weight (kg)0.16 0.26 0.48 0.8 1.85 2.65 4 6.3 5.7 11.5 28.8 49.4 80.9
Torsional stiffness (103 Nm/rad) CT
201514
392827
765554
1298584
17511097
191140135
450350340
510500400
780711
13041180
3400 5700 10950
Axial     (mm) max.
123
123
1.523
234
234
234
2.53.54.5
2.53.54.5
3.54.5
3.54.5
3.5 3 3
Lateral (mm) max.
0.150.21
0.20.251
0.20.251
0.20.251
0.20.251
0.250.31
0.250.31
0.30.351
0.351
0.351
0.4 0.4 0.4
Angular (degree) max.
11.52
11.52
11.52
11.52
11.52
11.52
11.52
11.52
1.52
1.52
1.5 1.5 1.5
Axial spring stiffness (N/mm) Ca
251584
5030118
7248165
4832144
8252130
9060280
10571605
704885
100285
320440
565 1030 985
Lateral spring stiffness (N/mm) Cr
475137140
900270224
1200420337
920290401
1550435500
2040610750
375010501200
2500840614
20001490
36001700
6070 19200 21800
CAD Portal 15 30 60 80 150 200 300 500 800 1500 4000 6000 10000
2D/3D Data 

Properties

  • Design:
    • With a single radial clamping screw per hub ISO 4762.
    • Any imbalance of the clamping hubs is compensated for by balancing bores located on the inside of the hub.
  • Temperature range: -30° C bis +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.
    • Hub material: see table below.
  • Brief overloads: 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 Bellows Coupling model BK2:
    • easy to mount
    • suited for space restricted installations
    • low moment of inertia

Overview