ASME B18.2.4.4M Metric Hex Flange Nuts

Dimensions of Metric Hex Flange Nuts

Nominal Nut Diameter and Thread Pitch	Width Across Flats, S		Width Across Corners, E		Flange Diameter, Dc, Max	Bearing Circle Diameter, Dw, Min	Flange Edge Thickness, C, Min	Thickness, M,		Flange Top Fillet Radius, R, Max
	Max	Min	Max	Min				Max	Min
M5 x 0.8	8.00	7.78	9.24	8.79	5.10	4.80	6.9	3.2	2.9	2.0
M6 x 1	10.00	9.78	11.55	11.05	5.70	5.40	8.9	3.5	3.2	2.4
M8 x 1.25	13.00	12.73	15.01	14.38	7.50	7.14	11.6	4.4	4.1	2.9
M10 x 1.5	15.00	14.73	17.32	16.64	10.0	9.60	13.6	5.7	5.4	3.4
M10 x 1.5	16.00	15.73	18.48	17.77	9.30	8.94	14.6	5.2	4.9	3.4
M12 x 1.75	18.00	17.73	20.78	20.03	12.00	11.57	16.6	7.3	6.9	4.0
M14 x 2	21.00	20.67	24.25	23.35	14.10	13.40	19.6	8.6	8.0	4.3
M16 x 2	24.00	23.67	27.71	26.75	16.40	15.70	22.5	9.9	9.3	5.3
M20 x 2.5	30.00	29.16	34.64	32.95	20.30	19.00	27.7	13.3	12.2	5.7
M24 x 3	36.00	35.00	41.57	39.55	23.90	22.60	33.2	15.4	14.3	6.7
M30 x 3.5	46.00	45.00	53.12	50.85	28.60	27.30	42.7	18.1	16.8	8.5
M36 x 4	55.00	53.80	63.51	60.79	34.70	33.10	51.1	23.7	22.4	8.5

All dimensions are in millimeters.

Types of Metric Prevailing - Torque Type Nuts : There are three basic designs for prevailing torque type nuts:

• All metal, one piece construction nuts which derive their prevailing-torque characteristics from controlled distortion of the nut thread and/or body.
• Metal nuts which derive their prevailing-torque characteristics from addition or fusion of a non-metallic insert, plug or patch in their threads.
• Top insert, two-piece construction nuts which derive their prevailing-torque characteristics from an insert, usually a full ring of non-metallic material, located and retained in the nut at its top surface.