ASME B18.2.3.2m Formed Hex Screws

Nominal Screw Dia., D, and Thread Pitch	Body Dia., D _s		Width Across Flats, S		Width Across Corners, E		Head Height, K		Wrenching Height, K ₁	Washer Face Thick., C		Washer Face Dia., D _w
Nominal Screw Dia., D, and Thread Pitch	Max	Min	Max	Min	Max	Min	Max	Min	Min	Max	Min	Max
ANSI B18.2.3.2M - M5 × 0.8	5	4.82	8	7.64	9.24	8.56	3.65	3.35	2.4	0.5	0.2	6.9
ANSI B18.2.3.2M - M6 × 1	6	5.82	10	9.64	11.55	10.8	4.15	3.85	2	0.5	0.2	8.9
ANSI B18.2.3.2M - M8 × 1.25	8	7.78	13	12.57	15.01	14.08	5.5	5.1	3.7	0.6	0.3	11.6
ANSI B18.2.3.2M - ^aM10× 1.5	10	9.78	15	14.57	17.32	16.32	6.63	6.17	4.5	0.6	0.3	13.6
ANSI B18.2.3.2M - M10 × 1.5	10	9.78	16	15.57	18.48	17.43	6.63	6.17	4.5	0.6	0.3	14.6
ANSI B18.2.3.2M - M12 × 1.75	12	11.73	18	17.57	20.78	19.68	7.76	7.24	5.2	0.6	0.3	16.6
ANSI B18.2.3.2M - M14 × 2	14	13.73	21	20.16	24.25	22.58	9.09	8.51	6.2	0.6	0.3	19.6
ANSI B18.2.3.2M - M16 × 2	16	15.73	24	23.16	27.71	25.94	10.32	9.68	7	0.8	0.4	22.5
ANSI B18.2.3.2M - M20 × 2.5	20	19.67	30	29.16	34.64	32.66	12.88	12.12	8.8	0.8	0.4	27.7
ANSI B18.2.3.2M - M24 × 3	24	23.67	36	35	41.57	39.2	15.44	14.56	10.5	0.8	0.4	33.2
a This size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 formed hex screws with 16 mm width across flats will be furnished. All dimensions are in millimeters. †Basic thread lengths, B, are the same as given in . ‡Transition thread length, X, includes the length of incomplete threads and tolerances on the grip gaging length and body length. It is intended for calculation purposes. For additional manufacturing and acceptance specifications, reference should be made to the Standard.