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Metric Hex Flange Nuts Size Dimension Table

Metric ISO Hardware Engineering Data
Inch ANSI Hardware Engineering Data
Fastener and Screw / Bolt Design, Formula & Calculations

Standard Metric Hex Flange Nuts Size Dimension Table per. ANSI B18.2.4.4M

Width Across Metric Nut Flats

The width across flats of nut shall be the distance measured, perpendicular to the axis of nut, overall between two opposite sides of the nut in accordance with the notes on respective dimensional tables. For milled- from-bar hex nuts, the nominal bar size used shall be the closest commercially available size to the specified basic width across flats of the nut. For milled-from- bar nonferrous nuts, the tabulated maximum (basic) width screws flats dimensions may be exceeded to con- form with the commercial tolerances of drawn or rolled bar stock material.

Metric Nut Thickness

The nut thickness shall be the overall distance, measured parallel to the axis of nut, from the top of the nut to the bearing surface and shall include the thickness of the washer face where provided

American National Standard Metric Hex Flange Nuts

ANSI B18.2.4.4M

Diameter and Thread Pitch	Width S		Width E		Diameter Dc	Bearing Circle Dia., Dw	Edge Thickness C	Thickness M		Flange Top Fillet Radius R
	Max	Min	Max	Min	Max	Min	Min	Max	Min	Max
M5 × 0.8	8.00	7.78	9.24	8.79	11.8	9.8	1.0	5.00	4.70	0.3
M6 × 1	10.00	9.78	11.55	11.05	14.2	12.2	1.1	6.00	5.70	0.4
M8 × 1.25	13.00	12.73	15.01	14.38	17.9	15.8	1.2	8.00	7.60	0.5
M10 × 1.5	15.00	14.73	17.32	16.64	21.8	19.6	1.5	10.00	9.60	0.6
M12 × 1.75	18.00	17.73	20.78	20.03	26.0	23.8	1.8	12.00	11.60	0.7
M14 × 2	21.00	20.67	24.25	23.35	29.9	27.6	2.1	14.00	13.30	0.9
M16 × 2	24.00	23.67	27.71	26.75	34.5	31.9	2.4	16.00	15.30	1.0
M20 × 2.5	30.00	29.16	34.64	32.95	42.8	39.9	3.0	20.00	18.90	1.2

All dimensions are in millimeters.

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