DIN 939 Dimensions for Stud Bolts with Metal End Length = 1.25D

d	e	b up to 125	b up to 200	b over 200
M6	7.5	18	24	-
M8	10	22	28	-
M10	12	26	32	45
M12	15	30	36	49
M16	20	38	44	57
M20	25	46	52	65