Dimensions of Metric Heavy Hex Screws

Nominal Screw Diameter, D, and Thread Pitch	Body Diameter Ds,		Width Across Flats, S		Width Across Corners, E		Head Height, K		Wrenching Height, K1	Washer Face Thickness, C		Washer Face Diameter, Dw
	Max	Min	Max	Min	Max	Min	Max	Min	Min	Max	Min	Max
M12 x 1.75	12.00	11.73	21.00	20.67	24.25	23.35	7.76	7.24	5.2	0.6	0.3	19.6
M14 x 2	14.00	13.73	24.00	23.67	27.71	26.75	9.09	8.51	6.2	0.6	0.3	22.5
M16 x 2	16.00	15.73	27.00	26.67	31.18	30.14	10.32	9.68	7.0	0.8	0.4	25.3
M20 x 2.5	20.00	19.67	34.00	33.00	39.26	37.29	12.88	12.12	8.8	0.8	0.4	31.4
M24 x 3	24.00	23.67	41.00	40.00	47.34	45.20	15.44	14.56	10.5	0.8	0.4	38.0
M30 x 3.5	30.00	29.67	50.00	49.00	57.74	55.37	19.48	17.92	13.1	0.8	0.4	46.6
M36 x 4	36.00	35.61	60.00	58.80	69.28	66.44	23.38	21.72	15.8	0.8	0.4	55.9

• All dimensions are in millimeters.
• Basic thread lengths, B, are the same as given in table 12.
• Transition Thread length X, includes the length of incomplete threads and tolerances on grip gaging length and body length. It is intended for calculation puposes
• For additional manufacturing and acceptance specifications, reference should be made to the standard.