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BK3 | Metal Bellows Coupling

Tapered Conical Sleeve Connection

The BK3 coupling is designed with tapered conical sleeves and strong,
 captive ISO 4017 draw-off screws.
It offers high clamping forces that provide for brief overloading of 1.5 times the rating indicated (See Table). There is absolutely no backlash due to the frictional clamp type connection, with a high degree of operating dependability. These couplings are maintenance-free if the technical ratings are not exceeded.
The bellows are made of highly flexible high-grade
 stainless steel. R+W's BK3 coupling is made to operate at speeds up to 10,000 rpm, in excess of 10,000 available with a finely balanced version. *Custom designs with varied tolerances, key-ways, non-standard material, bellows and ATEX designs are available upon request.

METAL BELLOWS COUPLING WITH TAPERED
CONICAL SLEEVES

15-10,000 NM

BK3 Diagram

BK3 Series Variants

*See above picture for reference

ItemTorque(Nm)Length (mm)Fit Length (mm)I.D. possible Ø - Ø H7 (mm)O.D. (mm)MomentInertiaWeight (kg)TorsionStiffnessAxial(mm)Lateral(mm)Angular(deg)AxialSpringStiffness(N/mm)LateralSpringStiffness(N/mm)Fastening screwTorque (Screw)Jack ScrewHub O.D.
BK3-151548 | 551910-22490,07 | 0,080,2520 | 151 | 20,15 | 0,21 | 1,525 | 15475 | 1376 x M443 x M449

BK3-303057 | 652212-23550,15 | 0,160,439 | 281 | 20,2 | 0,251 | 1,550 | 30900 | 2706 x M563 x M455

BK3-606066 | 762712-29660,39 | 0,410,876 | 551,5 | 20,2 | 0,251 | 1,572 | 481200 | 4206 x M583 x M566

BK3-15015075 | 873215-38811,2 | 1,61,2175 | 1102 | 30,2 | 0,251 | 1,582 | 521500 | 4356 x M6123 x M581

BK3-20020078 | 903215-44901,7 | 2,51,8191 | 1402 | 30,25 | 0,31 | 1,590 | 602040 | 6106 x M6143 x M690

BK3-30030089 | 1034124-561105,1 | 5,93450 | 3502,5 | 3,50,25 | 0,31 | 1,5105 | 713750 | 10506 x M8183 x M6110

BK3-50050097 | 1104124-601249,1 | 9,94,2510 | 5002,5 | 3,50,3 | 0,351 | 1,570 | 482500 | 8406 x M8253 x M6122

BK3-8008001145030-6013313,25,67803,50,351,510020006 x M10403 x M8116

BK3-150015001416135-7015734,98,213043,50,351,532036006 x M12706 x M8135

BK3-400040001958050-10020085,52334003,50,41,556560706 x M161206 x M10180

BK3-600060002108560-14025325432,6570030,41,51030192006 x M161506 x M10246

BK3-10000100002179270-18030362945,51095030,41,5985218008 x M161608 x M10295


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