ASME B18.2.3.9m Heavy Hex Flange Screws

Nominal Screw Dia., D, and Thread Pitch	Body Dia., D _s		Width Across Flats, S		Width Across Corners, E		Flange Dia., D _c	Bearing Circle Dia., D _w	Flange Edge Thickness, C	Head Height, K	Wrenching Height K₁	Fille Radius, R
Nominal Screw Dia., D, and Thread Pitch	Max	Min	Max	Min	Max	Min	Max	Min	Min	Max	Min	Max
ANSI B18.2.3.9M - M10 × 1.5	10	9.78	15	14.57	17.32	16.32	22.3	19.6	1.5	8.6	3.7	0.6
ANSI B18.2.3.9M - M12 × 1.75	12	11.73	18	17.57	20.78	19.68	26.6	23.8	1.8	10.4	4.6	0.7
ANSI B18.2.3.9M - M14 × 2	14	13.73	21	20.48	24.25	22.94	30.5	27.6	2.1	12.4	5.5	0.9
ANSI B18.2.3.9M - M16 × 2	16	15.73	24	23.16	27.71	25.94	35	31.9	2.4	14.1	6.2	1
ANSI B18.2.3.9M - M20 × 2.5	20	19.67	30	29.16	34.64	32.66	43	39.9	3	17.7	7.9	1.2
All dimensions are in millimeters. Reduced body diameter, Dsi, is the blank diameter before rolling. Shoulder is mandatory when body diameter is reduced.