Table 5. American National Standard Hex and Hex Flange Head Metric Machine Screws ANSI/ASME B18.6.7M-1999 (Withdrawn) Hex Head
R
Shape of Indentation Optional
D S
D S R
E
E
D A
D A
B
S
S
K
K
L
D S
S a
E a
K
D A
R
Nominal Screw Size and Thread Pitch
Underhead Fillet
Hex Width Across Corners
Hex Width Across Flats
Head Height
Transition Dia.
Body Diameter
Radius
Max.
Min. 1.65 2.12 2.58 3.00 3.43 4.36 5.21
Max.
Min.
Min. 3.38 4.28 5.40 5.96 7.59 8.71 10.95 14.26 17.62 19.86 16.50
Max.
Min.
Max.
Min.
2.00 2.50 3.00 3.50 4.00 5.00 6.00 8.00
3.20 4.00 5.00 5.50
3.02 3.82 4.82 5.32 6.78 7.78 9.78
1.6 2.1 2.3 2.6 3.0 3.8 4.7 6.0 7.5 9.0 7.5
1.3 1.8 2.0 2.3 2.6 3.3 4.1 5.2 6.5 7.8 6.5
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 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 M10 × 1.5 b
7.00 8.00 10.00 13.00 16.00 18.00 15.00
7.04 8.86 10.68
12.73 15.73 17.73 14.73
10.00 12.00 10.00
11.2 13.2 11.2
8.86 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 M10 size screws having heads with 15 mm width across flats are not ISO Standard. Unless M10 size screws with 15 mm width across flats are specifically ordered, M10 size screws with 16 mm width across flats shall be furnished.
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