Machinery's Handbook, 31st Edition
Metric Nuts 1737 Table 28. American National Standard Metric Hex Jam Nuts and Heavy Hex Nuts ASME B18.2.6-2019 and ANSI/ASME B18.2.6M-2012
S
M
M
M
M
C
C
E
D w
D w
D w
D w
D w
D w
Identification
HEX JAM NUTS
HEAVY HEX NUTS
Washer Face Thickness, C
Width Across Flats, S
Width Across Corners, E
Bearing Face Dia., D w
Nominal Nut Dia. and Thread Pitch
Thickness, M
Max.
Min.
Max.
Min.
Max. Min.
Min.
Max.
Min.
Metric Hex Jam Nuts
8.00 10.00
7.78
9.24
8.79
2.70 2.45 3.20 2.90 4.00 3.70 5.00 4.70 5.00 4.70 6.00 5.70 7.00 6.42 8.00 7.42
6.9 8.9
… … … … … … … … … … … … … … … …
M5 × 0.8 M6 × 1 M8 × 1.25 a M10 × 1.5 M10 × 1.5 M12 × 1.75 M14 × 2 M16 × 2 M20 × 2.5 M24 × 3 M30 × 3.5 M36 × 4 M12 × 1.75 M14 × 2 M16 × 2 M20 × 2.5 M22 × 2.5 M24 × 3 M27 × 3 M30 × 3.5 M36 × 4 M42 × 4.5 M48 × 5 M56 × 5.5 M64 × 6
9.78 11.55 11.05
13.00 12.73 15.01 14.38 15.00 14.73 17.32 16.64 16.00 15.73 18.48 17.77 18.00 17.73 20.78 20.03 21.00 20.67 24.25 23.35 24.00 23.67 27.71 26.75
11.6 13.6 14.6 16.6 19.6 22.5 27.7 33.2 42.7 51.1 19.2 22.0 24.9 31.4 33.3 38.0 42.8 46.6 55.9 64.5 73.7 82.8
30.00 29.16 34.64 32.95 10.00 9.10 36.00 35.00 41.57 39.55 12.00 10.90 46.00 45.00 53.12 50.85 15.00 13.90 55.00 53.80 63.51 60.79 18.00 16.90
0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 1.0 1.0 1.0 1.0 1.2 1.2 1.2 1.2
0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.6 0.6 0.6
Metric Heavy Hex Nuts
21.00 20.16 24.25 22.78 24.00 23.16 27.71 26.17 27.00 26.16 31.18 29.56 34.00 33.00 39.26 37.29 36.00 35.00 41.57 39.55 41.00 40.00 47.34 45.20 46.00 45.00 53.12 50.85 50.00 49.00 57.74 55.37 60.00 58.80 69.28 66.44 70.00 67.90 80.83 77.41 80.00 77.60 92.38 88.46 90.00 87.20 103.92 99.41 100.00 96.80 115.47 110.35 110.00 106.40 127.02 121.30 120.00 116.00 138.56 132.24 135.00 130.50 155.88 148.77
12.3 11.9 14.3 13.6 17.1 16.4 20.7 19.4 23.6 22.3 24.2 22.9 27.6 26.3 30.7 29.1 36.6 35.0 42.0 40.4 48.0 46.4 56.0 54.1 64.0 62.1 72.0 70.1 80.0 78.1 90.0 87.8
92.0 101.1 110.2 124.0 137.8
M72 × 6 M80 × 6 M90 × 6 M100 × 6
150.00 145.00 173.21 165.30 100.0 97.8 0.6 a This size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 hex jam nuts with 16 mm width across flats will be furnished. All dimensions are in millimeters.
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