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Metric Nut Dimensions

Size Chart


Width Across Flats (mm) Width Across Corners (mm) Nut Height (mm)
Nut Size Thread Pitch (mm) Max Min Min Max min
M1.6 0.35 3.20 3.02 3.41 1.30 1.05
M2 0.40 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 0.50 5.50 5.32 6.01 2.40 2.15
M3.5 0.60 6.00 5.82 6.58 2.80 2.55
M4 0.70 7.00 6.78 7.66 3.20 2.90
M5 0.80 8.00 7.78 8.79 4.70 4.40
M6 1.00 10.00 9.78 11.05 5.20 4.90
M8 1.25 13.00 12.73 14.38 6.80 6.44
M10 1.50 16.00 15.73 17.77 8.40 8.04
M12 1.75 18.00 17.73 20.03 10.80 10.37
M14 2.00 21.00 20.67 23.36 12.80 12.10
M16 2.00 24.00 23.67 26.75 14.80 14.10
M18 2.50 27.00 26.16 29.56 15.80 15.10
M20 2.50 30.00 29.16 32.95 18.00 16.90
M22 2.50 34.00 33.00 37.29 19.40 18.10
M24 3.00 36.00 35.00 39.55 21.50 20.20
M27 3.00 41.00 40.00 45.20 23.80 22.50
M30 3.50 46.00 45.00 50.85 25.60 24.30
M33 3.50 50.00 49.00 55.37 28.70 27.40
M36 4.00 55.00 53.80 60.79 31.00 29.40
M39 4.00 60.00 58.80 66.44 33.40 31.80
M42 4.50 65.00 63.10 71.30 34.00 32.40
M45 4.50 70.00 68.10 76.95 36.00 34.40
M48 5.00 75.00 73.10 82.60 38.00 36.40
M52 5.00 80.00 78.10 88.25 42.00 40.40
M56 5.50 85.00 82.80 93.56 45.00 43.40
M60 5.50 90.00 87.80 99.21 48.00 46.40
M64 6.00 95.00 92.80 104.86 51.00 49.10

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