METRIC NUT DIMENSIONS CHART

Metric nut dimensions sizes chart according to ISO 4032. 

Metric Hex Nut Dimensions

M3 Nut Dimensions:

Pitch: 0.5 mm, smax: 5.50 mm, smin: 5.32 mm, emin: 6.01 mm, mmax: 2.40 mm, mmin: 2.15 mm

M4 Nut Dimensions:

Pitch: 0.70 mm, smax: 7.00 mm, smin: 6.78 mm, emin: 7.66 mm, mmax: 3.2 mm, mmin: 2.9 mm

M5 Nut Dimensions:

Pitch: 0.80 mm, smax: 8.00 mm, smin: 7.78 mm, emin: 8.79 mm, mmax: 4.7 mm, mmin: 4.4 mm

M6 Nut Dimensions:

Pitch: 1.00 mm, smax: 10.00 mm, smin: 9.78 mm, emin: 11.05 mm, mmax: 5.2 mm, mmin: 4.9 mm

M8 Nut Dimensions:

Pitch: 1.25 mm, smax: 13.00 mm, smin: 12.73 mm, emin: 14.38 mm, mmax: 6.8 mm, mmin: 6.44 mm

M10 Nut Dimensions:

Pitch: 1.50 mm, smax: 16.00 mm, smin: 15.73 mm, emin:17.77 mm, mmax: 8.40 mm, mmin: 8.04 mm

M12 Nut Dimensions:

Pitch: 1.75 mm, smax: 18.00 mm, smin: 17.73 mm, emin: 20.03 mm, mmax: 10.80 mm, mmin: 10.37 mm

M16 Nut Dimensions:

Pitch: 2.0 mm, smax: 24.00 mm, smin: 23.67 mm, emin: 26.75 mm, mmax: 14.8 mm, mmin: 14.1 mm

M20 Nut Dimensions:

Pitch: 2.5 mm smax: 30.00 mm, smin: 29.16 mm, emin: 32.95 mm, mmax: 18.0 mm, mmin: 16.9 mm

M24 Nut Dimensions:

Pitch: 3 mm, smax: 36 mm, smin: 35 mm, emin: 39.55 mm, mmax: 21.5 mm, mmin: 20.2 mm

Nut Size Thread
Pitch		 s e m
Width
Across
Flats		 Width
Across
Corners		 Height
of
the
Nut
max. min. min. max. min.
M1.6 0.35 3.20 3.02 3.41 1.30 1.05
M2 0.4 4.00 3.82 4.32 1.60 1.35
M2.5 0.45 5.00 4.82 5.45 2.00 1.75
M3 0.5 5.50 5.32 6.01 2.40 2.15
M3.5* 0.6 6.00 5.82 6.58 2.80 2.55
M4 0.7 7.00 6.78 7.66 3.2 2.9
M5 0.8 8.00 7.78 8.79 4.7 4.4
M6 1 10.00 9.78 11.05 5.2 4.9
M8 1.25 13.00 12.73 14.38 6.80 6.44
M10 1.5 16.00 15.73 17.77 8.40 8.04
M12 1.75 18.00 17.73 20.03 10.80 10.37
M14* 2 21.00 20.67 23.36 12.8 12.1
M16 2 24.00 23.67 26.75 14.8 14.1
M18* 2.5 27.00 26.16 29.56 15.8 15.1
M20 2.5 30.00 29.16 32.95 18.0 16.9
M22* 2.5 34 33 37.29 19.4 18.1
M24 3 36 35 39.55 21.5 20.2
M27* 3 41 40 45.2 23.8 22.5
M30 3.5 46 45 50.85 25.6 24.3
M33* 3.5 50 49 55.37 28.7 27.4
M36 4 55.0 53.8 60.79 31.0 29.4
M39* 4 60.0 58.8 66.44 33.4 31.8
M42 4.5 65.0 63.1 71.3 34.0 32.4
M45* 4.5 70.0 68.1 76.95 36.0 34.4
M48 5 75.0 73.1 82.6 38.0 36.4
M52* 5 80.0 78.1 88.25 42.0 40.4
M56 5.5 85.0 82.8 93.56 45.0 43.4
M60* 5.5 90.0 87.8 99.21 48.0 46.4
M64 6 95.0 92.8 104.86 51.0 49.1

Note : * Non-preferred threads according to standard.

All dimensions are given in millimeters.

Supplements:

Reference:

  • ISO 4032:1999, Hexagon regular nuts (style 1) — Product grades A and B