scope:

This specification establishes mechanical and performance requirements for prevailing-torque hexagon locknuts.

Locknuts should be of the following types, grades and series (see 6.2).

Type I Nut, self-locking, hexagon, UNC/UNF-2B (see MIL-DTL-45913/1 and /2)

Type II Nut, self-locking, hexagon, UNC/UNF-3B (see MIL-DTL-45913/3 and /4)

Type III Nut, self-locking, flanged, prevailing-torque.

Three grades of carbon and alloy steel locknuts are designated as Grade 2, 5, and Grade 8 in accordance with SAE J995. Nonferrous materials as specified herein may be used for locknuts, but tensile strengths indicated below do not apply (see 6.2).

Each grade of carbon and alloy steel locknuts is suggested for use with bolts having specified minimum tensile strengths within the following values:

Specified Minimum Ultimate Tensile Grade of Locknut Strength of Bolt, P.S.I. Grade 2 (formerly Grade A) not greater than 90,000 Grade 5 (formerly Grade B and F) not greater than 120,000 Grade 8 (formerly Grade C and G) not less than 105,000 or greater than 150,000

Beneficial comments, recommendations, additions, deletions, clarifications, etc., And data which may improve this document should be sent to: Defense Industrial Supply Center, attn.: DISC-AEEA, 700 Robbins Avenue, Philadelphia, PA 19111-5096.

Locknuts should be of the following series.

Hex locknut (regular)

Hex thin locknut (jam)

Hex thick locknut

Hex heavy locknut

Hex flanged locknut

intended Use: