ASME B18.2.3.6M Heavy Hex Bolts

Nominal Dia., D and Thread Pitch	Body Diameter, D _s		Width Across Flats, S		Width Across Corners, E		Head Height, K		Wrenching Height, K ₁
Nominal Dia., D and Thread Pitch	Max	Min	Max	Min	Max	Min	Max	Min	Min
ANSI B18.2.3.6M - M12 × 1.75	12.7	11.3	21	20.16	24.25	22.78	7.95	7.24	5.2
ANSI B18.2.3.6M - M14 × 2	14.7	13.3	24	23.16	27.71	26.17	9.25	8.51	6.2
ANSI B18.2.3.6M - M16 × 2	16.7	15.3	27	26.16	31.18	29.56	10.75	9.68	7
ANSI B18.2.3.6M - M20 × 2.5	20.84	19.16	34	33	39.26	37.29	13.4	12.12	8.8
ANSI B18.2.3.6M - M24 × 3	24.84	23.16	41	40	47.34	45.2	15.9	14.56	10.5
ANSI B18.2.3.6M - M30 × 3.5	30.84	29.16	50	49	57.74	55.37	19.75	17.92	13.1
ANSI B18.2.3.6M - M36 × 4	37	35	60	58.8	69.28	66.44	23.55	21.72	15.8
All dimensions are in millimeters.*Basic thread lengths, B, are the same as given in . For additional manufacturing and acceptance specifications, reference should be made to the ANSI B18.2.3.6M-1979, R1989 standard.