Machinery's Handbook, 31st Edition
1730
Metric Screws and Bolts Table 21. American National Standard Socket Head Cap Screws Metric Series ANSI/ASME B18.3.1M-1986 (Withdrawn)
H
L
A
A
T
L G
G
L B
B D
M
J
S
G
T
120° Min.
Cham fer or Radius S
Hexa gon Socket Size a J
Transi tion Dia. B a
Spline Socket Size a M
Key Engage ment T
Body Diameter, D
Head Diameter A
Head Height H
Nom. Size and Thread Pitch
Max. Max. M1.6 × 0.35 1.60 1.46 3.00 2.87 1.60 1.52 0.16 1.5 1.829 0.80 2.0 M2 × 0.4 2.00 1.86 3.80 3.65 2.00 1.91 0.20 1.5 1.829 1.00 2.6 M2.5 × 0.45 2.50 2.36 4.50 4.33 2.50 2.40 0.25 2.0 2.438 1.25 3.1 M3 × 0.5 3.00 2.86 5.50 5.32 3.00 2.89 0.30 2.5 2.819 1.50 3.6 M4 × 0.7 4.00 3.82 7.00 6.80 4.00 3.88 0.40 3.0 3.378 2.00 4.7 M5 × 0.8 5.00 4.82 8.50 8.27 5.00 4.86 0.50 4.0 4.648 2.50 5.7 M6 × 1 6.00 5.82 10.00 9.74 6.00 5.85 0.60 5.0 5.486 3.00 6.8 M8 × 1.25 8.00 7.78 13.00 12.70 8.00 7.83 0.80 6.0 7.391 4.00 9.2 M10 × 1.5 10.00 9.78 16.00 15.67 10.00 9.81 1.00 8.0 … 5.00 11.2 M12 × 1.75 12.00 11.73 18.00 17.63 12.00 11.79 1.20 10.0 … 6.00 14.2 M14 × 2 b 14.00 13.73 21.00 20.60 14.00 13.77 1.40 12.0 … 7.00 16.2 M16 × 2 16.00 15.73 24.00 23.58 16.00 15.76 1.60 14.0 … 8.00 18.2 M20 × 2.5 20.00 19.67 30.00 29.53 20.00 19.73 2.00 17.0 … 10.00 22.4 M24 × 3 24.00 23.67 36.00 35.48 24.00 23.70 2.40 19.0 … 12.00 26.4 M30 × 3.5 30.00 29.67 45.00 44.42 30.00 29.67 3.00 22.0 … 15.00 33.4 M36 × 4 36.00 35.61 54.00 53.37 36.00 35.64 3.60 27.0 … 18.00 39.4 M42 × 4.5 42.00 41.61 63.00 62.31 42.00 41.61 4.20 32.0 … 21.00 45.6 M48 × 5 48.00 47.61 72.00 71.27 48.00 47.58 4.80 36.0 … 24.00 52.6 a See also Table 23. b The M14 × 2 size is not recommended for use in new designs. All dimensions are in millimeters Min. Max. Min. Max. Min. Max. Nom. Nom. Min. L G is grip length and L B is body length (see Table 15 ). For length of complete thread, see Table 15. For additional manufacturing and acceptance specifications, see ANSI/ASME B18.3.1M (Withdrawn).
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