Table 5. American National Standard Hex and Hex Flange Head Metric Machine Screws ANSI/ASME B18.6.7M-1985 Hex Flange Head R 15°–20° See note Shape of Indentation Optional Table 5. (Continued) American National Standard Hex and Hex Flange Head Metric Machine Screws ANSI/ASME B18.6.7M-1999 (Withdrawn)
D
S
E
B
K 1 R 1
D A
C
D C S
K
L
Body Diameter, D S
Nominal Screw Size and Thread Pitch
Flange Edge Thickness, C b Min.
Flange Top Fillet Radius, R 1 Max.
Hex Width Across Flats, S a
Flange Diameter, D C
Underhead Fillet
Hex Width Across Corners, E a Min.
Overall Head Height, K
Hex Height, K 1 Min.
Max. Transition Dia., D A
Min. Radius, R
Max.
Min.
Max.
Min. 2.84 3.04 3.84 4.82 5.32 6.78 7.78 9.78 12.72 14.72
Max.
Min.
2.00 2.50 3.00 3.50 4.00 5.00 6.00 8.00
1.65 2.12 2.58 3.00 3.43 4.36 5.21 7.04
3.00 3.20 4.00 5.00 5.50 7.00 8.00
3.16 3.39 4.27 5.36 5.92 7.55 8.66
4.5 5.4 6.4 7.5
4.1 5.0 5.9 6.9 7.8 9.8
2.2 2.7 3.2 3.8 4.3 5.4 6.7 8.6
1.3 1.6 1.9 2.4 2.8 3.5 4.2 5.6 7.0 8.4
0.3 0.3 0.4 0.5 0.6 0.7 1.0 1.2 1.4 1.8
0.1 0.2 0.2 0.2 0.2 0.3 0.4 0.5 0.6 0.7
2.6 3.1 3.6 4.1 4.7 5.7 6.8 9.2
0.1 0.1 0.1 0.1 0.2 0.2 0.3 0.4 0.4
M2 × 0.4 M2.5 × 0.45 M3 × 0.5 M3.5 × 0.6 M4 × 0.7 M5 × 0.8 M6 × 1 M8 × 1.25 M10 × 1.5 M12 × 1.75
8.5 10.6 12.8 16.8 21.0 24.8
11.8 15.5 19.3 23.3
10.00 13.00 15.00
10.89 14.16 16.38
10.00 12.00
8.86 10.68
10.7 13.7
11.2 13.2
0.4 a Dimensions across flats and across corners of the head are measured at the point of maximum metal. Taper of sides of head (angle between one side and the axis) shall not exceed 2° or 0.10 mm, whichever is greater, the specified width across flats being the large dimension. b The contour of the edge at periphery of flange is optional provided the minimum flange thickness is maintained at the minimum flange diameter. The top surface of flange may be straight or slightly rounded (convex) upward. All dimensions in millimeters. A slight rounding of all edges of the hexagon surfaces of indented hex heads is permissible provided the diameter of the bearing circle is not less than the equivalent of 90 percent of the specified minimum width across flats dimension. Heads may be indented, trimmed, or fully upset at the option of the manufacturer.
For dimension B , see Table 1. For dimension L , see Table 6.
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