Metal Bellows Couplings BK

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MODEL SERIES BK	BK1	BK2, BKC and BKL	BKH	BK3	BK4	BK5	BK6	BK7	BK8
	General \| technical information \| 2D and 3D download

Series from 15 - 150 Nm

Data table and downloads bellows coupling BK4 series 15 - 150 Nm

Model BK4		Series
		15		30		60		150
Rated torque (Nm)	T_KN	15		30		60		150
Overall length (mm)	A	47	54	68	76	72	82	82	94
Outer diameter of bellow (mm)	B	49		55		66		81
Fit length (mm)	C	19		22		27		32
Inner diameter possible from Ø to Ø H7 (mm)	D	10-22		12-23		12-29		15-37
6 x Fastening screws ISO 4017	E	M4		M5		M5		M6
Tighting torque of the fastening screws (Nm)	E	4		6		8		12
3 x draw-off screw ISO 4017	F	M4		M4		M5		M5
Shaft diameter (mm)	G	20		27		30		30
Shaft length (mm)	H	8.5		22		18		20
Mass moment of inertia (10^-3 kgm²)	J_ges	0.10	0.12	0.22	0.27	0.58	0.61	1.1	1.4
approx. weight (kg)		0.25		0.4		0.8		1.35
Torsional stiffness (10³ Nm/rad)	C_T	20	15	39	28	76	55	175	110
Axial (mm)	max.	1	2	1	2	1.5	2	2	3
Lateral (mm)	max.	0.15	0.2	0.2	0.25	0.2	0.25	0.2	0.25
Axial spring stiffness (N/mm)	C_a	25	15	50	30	72	48	82	52
lateral spring stiffness (N/mm)	C_r	475	137	900	270	1200	420	1500	435
Cone Ø (Fanuc-Motor) (mm)	I	11		16		16		16
Keyway wide (mm)	K	4		5		5		5
Downloads Short Version		15		30		60		150
2D-DXF (ZIP folder)
3D-EXE (Viewer)
3D-STEP (ZIP folder)
Downloads Long Version		15		30		60		150
2D-DXF (ZIP folder)
3D-EXE (Viewer)
3D-STEP (ZIP folder)

(1 Nm = 8.85 in lbs) max. angular misalignment see Bellow Coupling BK1