ASME B18.6.7m Hex Flange Head Machine Screws

Nominal Screw Size and Thread Pitch	Body Diameter, D_s		Hex Width Across Flats, S^a		Hex Width Across Corners, E^a Min	Flange Diameter, DC		Overall Head Height, K	Hex Height, K₁ Min,	Flange Edge Thickness, C^b Min	Flange Top Fillet Radius, R₁ Max	Underhead Fillet
	Body Diameter, D_s		Hex Width Across Flats, S^a			Flange Diameter, DC			Hex Height, K₁ Min,	Flange Edge Thickness, C^b Min		Max Transition Dia, D_A	Min Radius, R
	Max	Min	Max	Min		Max	Min		Min,	Min		Dia, D	Radius, R
ASME B18.6.7M - M2 × 0.4	2	1.65	3	2.84	3.16	4.5	4.1	2.2	1.3	0.3	0.1	2.6	0.1
ASME B18.6.7M - M2.5 × 0.45	2.5	2.12	3.2	3.04	3.39	5.4	5	2.7	1.6	0.3	0.2	3.1	0.1
ASME B18.6.7M - M3 × 0.5	3	2.58	4	3.84	4.27	6.4	5.9	3.2	1.9	0.4	0.2	3.6	0.1
ASME B18.6.7M - M3.5 × 0.6	3.5	3	5	4.82	5.36	7.5	6.9	3.8	2.4	0.5	0.2	4.1	0.1
ASME B18.6.7M - M4 × 0.7	4	3.43	5.5	5.32	5.92	8.5	7.8	4.3	2.8	0.6	0.2	4.7	0.2
ASME B18.6.7M - M5 × 0.8	5	4.36	7	6.78	7.55	10.6	9.8	5.4	3.5	0.7	0.3	5.7	0.2
ASME B18.6.7M - M6 × 1	6	5.21	8	7.78	8.66	12.8	11.8	6.7	4.2	1	0.4	6.8	0.3
ASME B18.6.7M - M8 × 1.25	8	7.04	10	9.78	10.89	16.8	15.5	8.6	5.6	1.2	0.5	9.2	0.4
ASME B18.6.7M - M10 × 1.5	10	8.86	13	12.72	14.16	21	19.3	10.7	7	1.4	0.6	11.2	0.4
ASME B18.6.7M - M12 × 1.75	12	10.68	15	14.72	16.38	24.8	23.3	13.7	8.4	1.8	0.7	13.2	0.4
a Dimensions across flats and across corners of the head are measured at the point of maximum metal. Taper of sides of head (angle between one side and the axis) shall not exceed 2° or 0.10 mm, whichever is greater, the specified width across flats being the large dimension. b The contour of the edge at periphery of flange is optional provided the minimum flange thickness is maintained at the minimum flange diameter. The top surface of flange may be straight or slightly rounded (convex) upward. All dimensions in millimeters. A slight rounding of all edges of the hexagon surfaces of indented hex heads is permissible provided the diameter of the bearing circle is not less than the equivalent of 90 per cent of the specified minimum width across flats dimension. Heads may be indented, trimmed, or fully upset at the option of the manufacturer. For dimension B, see Table 1. For dimension L, see Table 7.