BK3
Metal Bellows Coupling with tapered conical sleeves

15 - 10,000 Nm

BK3 METAL BELLOWS COUPLING WITH TAPERED CONICAL SLEEVES

Specifications BK3

BK3 series 15 30 60 150 200 300 500 800 1500 4000 6000 10000
Rated torque (Nm) TKN 15 30 60 150 200 300 500 800 1500 4000 6000 10000
Overall length (mm) A-2
4855
5765
6676
7587
7890
89103
97110
114 141 195 210 217
Outer diameter of bellow (mm) B 49 55 66 81 90 110 124 133 157 200 253 303
Fit length (mm) C 19 22 27 32 32 41 41 50 61 80 85 92
Inner diameter possible from Ø to Ø H7 (mm) D1/210-22 12-23 12-29 15-38 15-44 24-56 24-60 30-60 35-70 50-100 60-140 70-180
6x fastening screws
ISO 4017
E
6xM4
6xM5
6xM5
6xM6
6xM6
6xM8
6xM8
6xM10
6xM12
6xM16
6xM16
8xM16
Tighting torque of the
fastening screws (Nm)
E
4 6 8 12 14 18 25 40 70 120 150 160
3 x draw-off screw
ISO 4017
F
3xM4 3xM4 3xM5 3xM5 3xM6 3xM6 3xM6 3xM8 6xM8 6xM10 6xM10 8xM10
Outer diameter hub (mm)G49 55 66 81 90 110 122 116 135 180 246 295
Mass moment of inertia
(10-3 kgm2)
Jges
0.070.08
0.150.16
0.390.41
1.21.6
1.72.5
5.15.9
9.19.9
13.2 34.9 85.5 254 629
Approx. weight (kg)0.25 0.4 0.8 1.2 1.8 3 4.2 5.6 8.2 23 32.6 45.5
Torsional stiffness (103 Nm/rad) CT
2015
3928
7655
175110
191140
450350
510500
780 1304 3400 5700 10950
Axial     (mm)max.
12
12
1.52
23
23
2.53.5
2.53.5
3.5 3.5 3.5 3 3
Lateral  (mm) max.
0.150.2
0.20.25
0.20.25
0.20.25
0.250.3
0.250.3
0.30.35
0.35 0.35 0.4 0.4 0.4
Angular (degrees) max.
11.5
11.5
11.5
11.5
11.5
11.5
11.5
1.5 1.5 1.5 1.5 1.5
Axial spring stiffness (N/mm) Ca
2515
5030
7248
8252
9060
10571
7048
100 320 565 1030 985
Lateral spring stiffness (N/mm) Cr
475137
900270
1200420
1500435
2040610
37501050
2500840
2000 3600 6070 19200 21800
CAD Portal 15 30 60 150 200 300 500 800 1500 4000 6000 10000
2D/3D Data 

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