Machinery's Handbook, 31st Edition
1724
Metric Screws and Bolts Table 13. American National Standard Metric Hex Bolts ANSI/ASME B18.2.3.5M-1979 (R2016)
K K 1
S
E
D s
R
B
L g
Property Class and Manu- facturer’s Identification to Appear on Top of Head
15°–30°
L
For Bolt Lengths
Width Across Corners, E
Head Height, K
Width Across Flats, S
Body Diameter, D s
Nominal Bolt Dia., D and Thread Pitch
Basic Thread Length, a B
Max.
Min.
Max.
Min.
Max.
Min. Max. Min. Min.
5.48 4.52 8.00 7.64 9.24 8.63 3.58 3.35 2.4 16 22 35 6.19 5.52 10.00 9.64 11.55 10.89 4.38 3.55 2.8 18 24 37
M5 × 0.8 M6 × 1 M8 × 1.25
8.58 7.42 13.00 12.57 15.01 14.20 5.68 5.10 3.7 22 28 41 b M10 × 1.5 10.58 9.42 15.00 14.57 17.32 16.46 6.85 6.17 4.5 26 32 45 M10 × 1.5 10.58 9.42 16.00 15.57 18.48 17.59 6.85 6.17 4.5 26 32 45 M12 × 1.75 12.70 11.30 18.00 17.57 20.78 19.85 7.95 7.24 5.2 30 36 49 M14 × 2 14.70 13.30 21.00 20.16 24.25 22.78 9.25 8.51 6.2 34 40 53 M16 × 2 16.70 15.30 24.00 23.16 27.71 26.17 10.75 9.68 7.0 38 44 57 M20 × 2.5 20.84 19.16 30.00 29.16 34.64 32.95 13.40 12.12 8.8 46 52 65 M24 × 3 24.84 23.16 36.00 35.00 41.57 39.55 15.90 14.56 10.5 54 60 73 M30 × 3.5 30.84 29.16 46.00 45.00 53.12 50.55 19.75 17.92 13.1 66 72 85 M36 × 4 37.00 35.00 55.00 53.80 63.51 60.79 23.55 21.72 15.8 78 84 97 M42 × 4.5 43.00 41.00 65.00 62.90 75.06 71.71 27.05 25.03 18.2 90 96 109 M48 × 5 49.00 47.00 75.00 72.60 86.60 82.76 31.07 28.93 21.0 102 108 121 M56 × 5.5 57.20 54.80 85.00 82.20 98.15 93.71 36.20 33.80 24.5 … 124 137 M64 × 6 65.52 62.80 95.00 91.80 109.70 104.65 41.32 38.68 28.0 … 140 153 M72 × 6 73.84 70.80 105.00 101.40 121.24 115.60 46.45 43.55 31.5 … 156 169 M80 × 6 82.16 78.80 115.00 111.00 132.79 126.54 51.58 48.42 35.0 … 172 185 M90 × 6 92.48 88.60 130.00 125.50 150.11 143.07 57.74 54.26 39.2 … 192 205 M100 × 6 102.80 98.60 145.00 140.00 167.43 159.60 63.90 60.10 43.4 … 212 225 a Basic thread length, B , is a reference dimension. b This size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 hex bolts with 16 mm width across flats will be furnished. All dimensions are in millimeters. For additional manufacturing and acceptance specifications, reference should be made to the ASME B18.2.3.5M-1979 (R2016) standard. Materials and Mechanical Properties.— Unless otherwise specified, steel metric screws and bolts, with the exception of heavy hex structural bolts, hex lag screws, and socket head cap screws, conform to the requirements specified in SAE J1199 or ASTM F568. Steel heavy hex structural bolts conform to ASTM A325M or ASTM A490M. Alloy steel socket head cap screws conform to ASTM A574M, property class 12.9, where the nu- meral 12 represents approximately one-hundredth of the minimum tensile strength in megapascals and the decimal .9 approximates the ratio of the minimum yield stress to the minimum tensile stress. This is in accord with ISO designation practice. Screws and bolts
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