Model No.	D	D1	B	E	F	M	S
BK-10	12/14/15	10	8	36	15	M10x1	12
BK-12	14/15/16	12	10	36	15	M12x1	12
BK-15	18/20	15	12	40	20	M15x1	12
BK-17	20/25	17	15	53	23	M17x1	17
BK-20	25/28	20	17	53	25	M20x1	15
BK-25	32/36	25	20	56	30	M25x1.5	20
BK-30	36/40	30	25	73	38	M30x1.5	25
BK-35	45	35	30	82	45	M30x1.5	26
BK-40	50	40	35	84	50	M40x1.5	30