MIL-DTL-45913D
3.3.2. Corrosion-resistant steel. Corrosion-resisting steel locknuts shall be passivated in accordance with
ASTM A967.
Brass. Brass locknuts shall be uncoated plain.
3.3.3
3.3.4. Aluminum alloy. Aluminum alloy locknuts shall be anodized in accordance with MIL-A-8625, Type
II , Class 1.
Heat treatment Heat treatment of all materials shall be as specified on the appropriate specification
3.4
sheet.
3.4.1
Heat treatment for carbon and alloy steels shall be in accordance with SAE J995 (steel locknuts).
3.4.2
Solution annealing of stainless steels shall be in accordance with ASTM F594.
3.4.3
Heat treatment of brass shall be in accordance with ASTM F467.
3.5 Dimensions. Locknuts shall conform to the dimensions specified on the applicable specification sheet.
The portion of the locknut containing the locking feature may have a special contour within the maximum
permitted width across flats and thickness. Bearing surfaces shall be flat and perpendicular to the axis of the
thread hole within a tolerance of 2. Bearing surface roughness shall not exceed 125 Ra microinches in
accordance with ASME B46.1.
3.6 Threads.
3.6.1 Thread Series and Class . Thread series, class, and tolerances shall be called out on the applicable
specification sheet and be in accordance with ASME B1.1. except minor diameters where ASME B1.15 may
apply Thread inspection and acceptability shall be in accordance with ASME B1.3M, System 21. Threads shall
be inspected prior to installation of locking feature.
3.6.2 Locking feature. Locknuts shall be checked after installation of the locking feature, and shall allow
the "GO" gage to enter not less than a half turn with a basic GO thread plug gage to ensure that the locknut is
functionable.
3.7 Mechanical requirements.
3.7.1 Hardness. Carbon and alloy steel locknut hardness shall be in accordance with SAE J995.
3.7.2 Magnetic permeability. The magnetic permeability of the corrosion resistant steel locknuts shall be
less than 2.0 (air = 1.0) in a field strength of H= 200 oersteds.
3.8 Construction. The locknut shall be a self-contained unit or assembly, including the locking feature.
The locking feature shall not operate by means of separate movement from the installation and shall not depend
upon pressure on the bearing surface for locking action.
3.9 Marking. All nuts of .250 nominal thread size and larger shall be marked with equally spaced identical
symbols (notch, dot, letter or number) as indicated in Figure 1 or SAE J995, for Grade 5 and 8 locknuts. All
locknuts shall be marked to identify the manufacturer. Such markings may be additional to the grade markings or
an alteration of one or more of the three or six grade marking symbols. Marks shall be raised or depressed, at the
manufacturer's option. Raised marks shall not project beyond the specified maximum height or width of the
locknut. The color of the non-metallic locking element may be used to identify the manufacturer if the color has
been established as the manufacturer's legitimate trademark or symbol. The shape of the all metal locking feature
may also be used if it has been established as the manufacturer's legitimate trademark.
3.10 Discontinuities. Limits on presence of discontinuities shall be in accordance with ASTM F812.
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