Table 10. American National Standard Metric Round Head Square Neck Bolts ANSI/ASME B18.5.2.2M-1982 (Withdrawn)
(30° REF) (R k )
R
V
D s
D
D w
F F 1
D c E
C
K
L g
(B REF) ‡
L
Nominal Bolt Dia., D and Thread Pitch M5 × 0.8 M6 × 1 M8 × 1.25 M10 × 1.5 M12 × 1.75 M14 × 2 M16 × 2 M20 × 2.5 M24 × 3
Diameter of Full Body, D s
Head Edge Thickness, C
Bearing Surface Dia., D w
Square Corner Depth, F 1
Square Width Across Flats, V
Square Width Across Corners, E
Head Radius, ( R k )
Head height, K
Head Dia., D c Max. 11.8 14.2 18.0 22.3 26.6 30.5 35.0 43.0 51.0
Square Depth, F
Max. 5.48 6.48 8.58 10.58 12.70 14.70 16.70 20.84 24.84
Min. 4.52 5.52 7.42 9.42 11.30 13.30 15.30 19.16 23.16
Ref. 8.8 10.7 12.5 15.5 19.0 21.9 25.5 31.9 37.9
Max.
Min.
Max.
Min.
Min.
Max.
Min.
Min.
Max. 5.48 6.48 8.58 10.58 12.70 14.70 16.70 20.84 24.84
Min. 4.88 5.88 7.85 9.85 11.82 13.82 15.82 19.79 23.79
Max. 7.75 9.16 12.13 14.96 17.96 20.79 23.62 29.47 35.13
Min. 6.34 7.64 10.20 12.80 15.37 17.97 20.57 25.73 30.93
3.1 3.6 4.8 5.8 6.8 7.9 8.9
2.5 3.0 4.0 5.0 6.0 7.0 8.0
1.8 1.9 2.2 2.5 2.8 3.3 3.6 4.2 5.1
1.0 1.1 1.2 1.5 1.8 2.1 2.4 3.0 3.6
9.8
3.1 3.6 4.8 5.8 6.8 7.9 8.9
2.5 3.0 4.0 5.0 6.0 7.0 8.0
1.6 1.9 2.5 3.2 3.8 4.4 5.0 6.3 7.6
12.2 15.8 19.6 23.8 27.6 31.9 39.9 47.6
10.9 13.1
10.0 12.0
10.9 13.1
10.0 12.0
All dimensions are in millimeters. † L g is the grip gaging length which controls the length of thread B . ‡ B is the basic thread length and is a reference dimension (see Table 14 ). For additional manufacturing and acceptance specifications, see ANSI/ASME B18.5.2.2M-1982.
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