Metric Screws and Bolts Machinery's Handbook, 31st Edition
1717
Table 4. American National Standard Metric Hex Screws and Bolts — Reduced Body Diameters
D si
D s
L sh
Nominal Dia., D , and Thread Pitch
Nominal Dia., D , and Thread Pitch
Shoulder Diameter, a D s
Body Diameter, D si
Shoulder Length, a L sh
Shoulder Diameter, a D s
Body Diameter, D si
Shoulder Length, a L sh
Max. Min. Max. Min. Max. Min.
Max. Min. Max. Min. Max. Min.
Metric Formed Hex Screws (ANSI/ASME B18.2.3.2M-2005 [Withdrawn])
5.00 4.82 4.46 4.36 3.5 2.5 M14 × 2 14.00 13.73 12.77 12.50 8.0 7.0
M5 × 0.8
M6 × 1 6.00 5.82 5.39 5.21 4.0 3.0 M16 × 2 16.00 15.73 14.77 14.50 9.0 8.0 M8 × 1.25 8.00 7.78 7.26 7.04 5.0 4.0 M20 × 2.5 20.00 19.67 18.49 18.16 11.0 10.0 M10 × 1.5 10.00 9.78 9.08 8.86 6.0 5.0 M24 × 3 24.00 23.67 22.13 21.80 13.0 12.0 M12 × 1.75 12.00 11.73 10.95 10.68 7.0 6.0 … … … … … … … Metric Hex Flange Screws (ANSI/ASME B18.2.3.4M-2001 [Withdrawn]) M5 × 0.8 5.00 4.82 4.54 4.36 3.5 2.5 M12 × 1.75 12.00 11.73 10.95 10.68 7.0 6.0 M6 × 1 6.00 5.82 5.39 5.21 4.0 3.0 M14 × 2 14.00 13.73 12.77 12.50 8.0 7.0 M8 × 1.25 8.00 7.78 7.26 7.04 5.0 4.0 M16 × 2 16.00 15.73 14.77 14.50 9.0 8.0 M10 × 1.5 10.00 9.78 9.08 8.86 6.0 5.0 … … … … … … … Metric Hex Bolts (ANSI/ASME B18.2.3.5M-1979 [R2016]) M5 × 0.8 5.48 4.52 4.46 4.36 3.5 2.5 M14 × 2 14.70 13.30 12.77 12.50 8.0 7.0 M6 × 1 6.48 5.52 5.39 5.21 4.0 3.0 M16 × 2 16.70 15.30 14.77 14.50 9.0 8.0 M8 × 1.25 8.58 7.42 7.26 7.04 5.0 4.0 M20 × 2.5 20.84 19.16 18.49 18.16 11.0 10.0 M10 × 1.5 10.58 9.42 9.08 8.86 6.0 5.0 M24 × 3 24.84 23.16 22.13 21.80 13.0 12.0 M12 × 1.75 12.70 11.30 10.95 10.68 7.0 6.0 … … … … … … … Metric Heavy Hex Bolts (ANSI/ASME B18.2.3.6M-1979 [Withdrawn]) M12 × 1.75 12.70 11.30 10.95 10.68 7.0 6.0 M20 × 2.5 20.84 19.16 18.49 18.16 11.0 10.0 M14 × 2 14.70 13.30 12.77 12.50 8.0 7.0 M24 × 3 24.84 23.16 22.13 21.80 13.0 12.0 M16 × 2 16.70 15.30 14.77 14.50 9.0 8.0 … … … … … … … Metric Heavy Hex Flange Screws (ANSI/ASME B18.2.3.9M-2001 [R2014]) M10 × 1.5 10.00 9.78 9.08 8.86 6.0 5.0 M16 × 2 16.00 15.73 14.77 14.50 9.0 8.0 M12 × 1.75 12.00 11.73 10.95 10.68 7.0 6.0 M20 × 2.5 20.00 19.67 18.49 18.16 11.0 10.0 M14 × 2 14.00 13.73 12.77 12.50 8.0 7.0 … … … … … … … a Shoulder is mandatory for formed hex screws, hex flange screws, and heavy hex flange screws. Shoulder is optional for hex bolts and heavy hex bolts. All dimensions are in millimeters.
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