scope:

This specification is approved for use by US Army Armament Research and Development Command, Department of the Army, and is available for use by all Departments and Agencies of the Department of Defense.

The complete requirements for acquiring the bolts described herein shall consist of this specification and the latest issue of DOD-B-70331. TABLE II. Length range tolerance.

Nominal bolt M6X1 M10.X1.5 M20X2.5 size range thru thru and M30X3.5 M8X1.25 M16X2 M24X3 ---------------------------------------------------------------------- Nominal bolt length Length range tolerance, mm ---------------------------------------------------------------------- Up to 10 mm, incl −0.6 −0.6 -- -- Over 10 to 18mm, incl −0.7 −0.7 -- -- Over 18 to 30mm, incl −0.8 −0.8 −1.3 -- Over 30 to 50mm, incl −1.0 −1.6 −2.5 −3.0 Over 50 to 80mm, incl −1.2 −1.9 −3.0 −3.5 Over 80 to 120mm, incl −1.4 −2.2 −3.5 −4.0 Over 120 to 180mm, incl −2.5 −2.5 −4.0 −4.5 Over 180 to 240 mm, incl −4.6 −4.6 −4.6 −6.0 Over 240 mm −6.0 −6.0 −6.0 −6.0

TABLE III. Fillet dimensions.

Fillet Fillet Fillet transition length radius Nominal diameter bolt dia For For short For For For short thread short and long long short and long pitch bolts bolts bolts bolts bolts Min Max Max Max Min ----------------------------------------------------------------- M6X1 6.2 6.8 1.1 0.7 0.3 M8X1.25 8.3 9.0 1.2 0.8 0.4 M10X1.5 10.2 11.0 1.2 0.9 0.4 M12X1.75 12.2 13.0 1.2 1.0 0.4 M14X2 14.1 15.0 1.2 1.1 0.4 M16X2 16.5 17.0 1.2 1.1 0.4 M20X2.5 20.7 21.0 1.2 1.2 0.4 M24X3 24.5 25.4 1.4 1.4 0.4 M30X3.5 30.7 31.4 1.6 1.6 0.4

TABLE V. Point diameter and length.

Nom X Z bolt dia Point diameter Point length thread size Approx Max Min -------------------------------------------------------- M6X1 4.5 1.50 0.50 M8X1.25 6.1 1.88 0.62 M10X1.5 7.7 2.25 0.75 M12X1.75 9.4 2.62 0.88 M14X2 11.0 3.00 1.00 M16X2 13.0 3.00 1.00 M20X2.5 16.2 3.75 1.25 M24X3 19.5 4.50 1.50 M30X3.5 24.7 5.25 1.75