BKBKSERIES BK | 15 – 10,000 NmFLEXIBLE AND TORSIONALLY RIGID.BELLOWS COUPLINGSTHE ULTIMATE COUPLING FROM 15 – 10,000 NmR+WR+W2TORSIONALLY STIFF METAL BELLOWS COUPLINGSAreas of application: Servo drives CNC axes Robotic axes Manipulators Linear actuatorsProperties of the product range: zero backlash high torsional stiffness exact transmission of angular motion and torque infinite life wear and maintenance free MODEL PROPERTIES APPLICATION EXAMPLESwith flange mounting from 15-10,000 Nm special design applicationwith split hub from 15-1,500 Nm for radial mounting suited for space restrictedinstallations low moment of inertia finely balanced up to40,000 rpmBKHsee page 7�������with clamping hub from 15-1,500 Nm easy to mount suited for space restrictedinstallations low moment of inertia finely balanced up to40,000 rpmBK 2see page 6BK1see page 5 Printing machines Packaging machines Woodworking machines Textile machinery Metal cutting machines easy mounting and dismounting compensation of axial, lateral and angular shaft misalignment accompanied by quiet, uniform operation�������R+WR+WTORSIONALLY STIFF METAL BELLOWS COUPLINGS3MODEL PROPERTIES APPLICATION EXAMPLES Economy Class with clamping hub from 2-500 Nm low cost version self opening clamping system optionalBKL� ��� ��� �� ������ ��see separate catalogfor Fanuc-drives from 15-80 Nm for conical shaft mounting easy to assemble high clamping forces, due toconical sleevesBK 4�� ����������������� ������ ��� �� ��see page 9with tapered conical sleeves from 15-10,000 Nm high clamping forces high degree of operatingdependability new draw off device suitedfor space restricted installationsBK 3� �� �� �� �� �� �� �� �� �� �� �� �� �� �� ������ �� ��� ��see page 8Approach to dateThe new approachwith tapered press-fit connection from 15-1,500 Nm absolutely backlash-free easy mounting and dismounting wear-free press fit connection electrically and thermally insulatedBK 5� ��� ��� �� ��� �� �� �� �� �� �����see page 10R+WR+W4TORSIONALLY STIFF METAL BELLOWS COUPLINGSMODEL PROPERTIES APPLICATION EXAMPLESwith conical sleeve and tapered press-fit connection from 15-1,500 Nm for axial mounting absolutely backlash-free easy mounting and dismounting wear-free press-fit connection electrically and thermally insulated high degree of operating dependabilityBK 6� �� �� �� �� �� �� �� �� �� �� ��� �� ����see page 11Line shafts with clamping hub from 10-4,000 Nm removable intermediate tube section no additional bearingneccessary standart length up to 6 mZA� �� �� �� �� �see separate catalogefor the use in explosive environments available for the full product range for hazardous areas 1/21 and 2/22bellows couplings are registeredaccording to the directive ATEX 95/137ATEXsee page 13with expanding shaft from 15-300 Nm for hollow shaft mounting suited for space restrictedinstallations easy mountingBK 7see page 12R+WR+WTORSIONALLY STIFF METAL BELLOWS COUPLINGS��������������������������������������������������Ordering exampleModel Series / Nm Overall length Non standard e.g. stainless steelBK1/ 150 / 62 / XX5TECHNICAL SPECIFICATIONSProperties: special design applicationMaterial:Bellows made of highly flexible high grade stainless steel, hub material: steelDesign: The Hubs have six threaded metric mounting holes, and the ID and OD are concentrically machined to ISO H7 tolerances.Hubs with custom bore size, mounting threads and bolt circles are available upon request. Temperature range:-30 to +120° C (3.6 F - 270 F)Speeds: Up to 10,000 rpm, in excess of 10,000 with finely balanced version.Service life: These couplings are maintenance-free if the technical limits are not exceededBacklash: Absolutely backlash-free due to bolted connection.Brief overloads: Acceptable up to 1.5 times the value specified.Tolerance: On the hub/shaft connection 0.01 to 0.05 mmNon-standard application: Custom designs with varied tolerances, keyways, non-standard material and bellows are available upon request.Model BK 1Series 15306015020030050080015004000600010000Rated torque (Nm)TKN15306015020030050080015004000600010000Overall length (mm)A303736444353506253655670647781100145138150Outer diameter of bellows (mm)B4955668190110123133157200253303Fit length thread depth (mm)C7.51010131414161822303036Inner diameter H7 (mm)D2528385058657075851001451906 x fastening threads EM5M5M6M6M6M8M8M10M16M208xM208xM24Hub bolt circle ± 0.2 (mm)F3537466270809490110140190234Outer diameter f7 (mm)G4955668190110122116140182235295Moment of inertia (10-³ kgm²)Jtotal0.07 0.08 0.14 0.15 0.30 0.32 0.90 0.95 1.30 1.40 1.95 2.103.03.44.310.646132350Approx. weight (kg)0.150.20.30.60.81.51.41.63.38.913.923.7Torsional stiffness (10 ³ Nm/rad)CT20153928765517511019114045035051050078013043400570010950axial (mm) Max. values12121.5223232.53.52.53.53.53.53.533lateral (mm0.150.20.20.250.20.250.20.25 0.250.30.250.30.30.350.350.350.40.40.4angular (Grad)1.521.521.521.521.52.21.52.21.82.。