MIL-DTL-45913D
4.4.5 Test bolt. The test bolt used in the prevailing-torque test of steel locknuts shall have a zinc phosphate
or cadmium plated and oil finish (dry to the touch) meeting a 72 hour salt spray test when tested in accordance
with Test 1 of NASM1312-1. Corrosion-resisting steel locknuts shall be torque tested on corrosion-resisting steel
test bolts. Aluminum alloy locknuts shall be torque tested on anodized aluminum alloy test bolts. Brass locknuts
shall be torque tested on plain brass test bolts.
4.4.6 Load Measuring device. The load measuring device used in the prevailing-torque test shall be an
instrument capable of measuring the actual tension induced in the test bolt as the locknut is tightened. The device
shall be accurate within plus or minus 5 percent of the test load.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract order or order (see 6.2) When actual packaging of material is to be performed by DoD personnel,
these personnel need to contact the responsible packaging activity to ascertain requisite packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging activity
within the Military Department or Defense Agency, or within the Military Department's Defense Agency's
automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.
6. NOTES:
(This section contains information of a general or explanatory nature which may be helpful, but is not
mandatory.)
6.1 Intended use. A prevailing-torque type locknut is a nut which is frictionally resistant to rotation due to a
self-contained prevailing-torque (locking) feature, and not because of a compressive load developed against the
bearing surface of the locknut.
Each grade of carbon and alloy steel locknuts identified in this document is intended for use with bolts
having specified minimum tensile strengths within the following values:
Specified Minimum Ultimate Tensile
Strength of Bolt, P.S.I.
Grade of Locknut
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
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number and date of this specification.
b. Type, grade and series (1.2.1, 1.2.2 and 1.2.3).
c. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue of individual
documents referenced (see 2.1)
d. Material (3).
e. Protective finish, when required (3.2).
f. Thread form, series and class (3.5.1).
g. Grade marking, if required (3.8).
h. Packaging requirements (5.1).
i. Domestic manufacturing source only unless otherwise specified.
6.3 Non-metallic insert. Locknuts with non-metallic inserts should not be used in installations where
temperatures exceed 2500F.
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