DIN 931 - Specification for Hexagon Cap Screws Partially Threaded Bolts

(Similar to ISO 4014 & UNI 5737))

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DIN 931 Partially threaded Hexagon head Bolt

“b” measurement varies according to the length of the bolt

All measurements in millimetres (mm) and strictly informative

d1	b to 125	b to 200	b over 200	k	e	s
M4	14	–	–	2.8	7.66	7
M5	16	–	–	3.5	8.79	8
M6	18	24	–	4	11.05	10
M8	22	28	–	5.3	14.38	13
M10	26	32	45	6.4	18.9	17
M12	30	36	49	7.5	21.1	19
M14	34	40	53	8.8	24.49	22
M16	38	44	57	10	26.75	24
M18	42	48	61	11.5	30.14	27
M20	46	52	65	12.5	33.53	30
M22	50	56	69	14	35.72	32
M24	54	60	73	15	39.98	36
M27	60	66	79	17	45.2	41
M30	66	72	85	18.7	50.85	46
M33	72	78	91	21	55.37	50
M36	78	84	97	22.5	60.79	55
M42	90	96	109	26	71.3	65
M45	96	102	115	28	76.95	70
M48	102	108	121	30	82.60	75