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BK7 | Metal Bellows Coupling

Expanding Shaft

The BK7 is designed with one side having a single radial clamping screw (ISO 4762) and the other side an expanding shaft with a tapered clamping element.
The frictional clamp connection provides for an easily mounted, completely backlash free solution. These couplings have an infinite life and are maintenance-free if the technical ratings are not exceeded. Brief overloads of up to 1.5 times the value specified are acceptable with this coupling. Bellows are made of highly flexible high-grade
 stainless steel, see table for hub material. The Expanding Hub and cone are made of steel. BK7 couplings are rated for speeds up to 10,000 RPM and higher speed versions (Finely Balanced) are available. Custom designs with varied tolerances, key-ways, non-standard material,
 bellows and ATEX designs are also available upon request. The compact design conserves space while saving cost.

METAL BELLOWS COUPLING
WITH EXPANDING SHAFT

15 - 300 NM

BK7 Diagram

BK7 Series Variants

*See above picture for reference

ItemTorque(Nm)LengthI.D. H7(mm)OD (mm) BMomentInertia 10-3Weight(Kg)TorsionStiffnessAxial(mm)Lateral(mm)Angular(deg)AxialSpringStiffness(N/mm)LateralSpringStiffness(N/mm)Fastening screwTorque (Screw)Distance CenterLinesDistanceMount Length (mm)FitLength (mm)Shaft O.D.Hub Material
BK7-151545 | 528-28490,07 | 0,080,1520 | 151 | 20,15 | 0,21|1,520 | 12315 | 108M58176,5222013-25Aluminium

BK7-303053 | 6110-30550,14 | 0,150,339 | 281 | 20,2 | 0,251|1,550 | 30730 | 230M614197,5272514-30Aluminium

BK7-606062 | 7212-35660,23 | 0,260,476 | 551,5 | 20,2 | 0,251|1,572 | 481200 | 380M838239,5312723-38Aluminium

BK7-15015071 | 8319-42812,2 | 2,41,7175 | 1102 | 30,2 | 0,251|1,582 | 521550 | 435M10652711363226-42Steel

BK7-30030084 | 9830-601106,5 | 8,94450 | 3502,5 | 3,50,25 | 0,31|1,5105 | 713750 | 1050M121203913434538-60Steel



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