AN924 Rev 13
Trivalent wrenchability. When the finish has been damaged due to poor wrenchability, the surface of
the connector shall be touched up using the brush plating process below. The term "trivalent
wrenchability" is used to evaluate the ability of the finish to withstand abrasion from an excessive
amount of wrenching.
a. Brush plating of hard chromium by electrodeposition shall be in accordance with
SAE-AMS-2451/5.
b. Brush plating of medium-hardness, low stress nickel by electrodeposition shall be in
accordance with SAE-AMS-2451/9.
c. Brush plating of NAVAIR TCP shall be in accordance with MIL-DTL-81706, type II, class 1A,
material form 1 through 6, application method B. Example of a PIN: M817062A6B.
Part or Identifying Number (PIN): The PIN consists of the letters "AN" the specification sheet number,
a dash number for pipe nut tube size, and a material and finish code letter. Unassigned PIN's shall
not be used.
AN 924
-4
W
Material and finish code letter (see table I)
Size dash number (see figure 1)
Specification sheet number
AN prefix
PIN example: AN924-4W indicates nut 1/4 inch tubing with aluminum alloy 7075-T73.
Marking: Part shall be impression stamped with the AN PIN, and include the manufacturers CAGE,
name, or trademark on the hex side only.
Cadmium is not recommended. To the users of this document, it is recommended that the use of
carbon steel material with cadmium plating be used only when other materials and finishes specified
in this document cannot meet performance requirements.
Supersession data:
Due to stress corrosion cracking aluminum alloys 2014 and 2024 "D" designator has been
replaced by aluminum alloy 7075 "W" designator example: AN924-4D use AN924-4W.
Metal cracking due to high temperatures CRES alloy 347 "S" designator has been replaced by
CRES alloy 321 "R" designator. Example: AN9244S use AN924-4R.
AN924 and MS24400 CRES nuts of like size are physically interchangeable; however MS24400
nuts coded C cannot always replace AN924 nuts coded J or K and MS24400 nuts coded S
cannot always replace AN924 nuts coded S.
Table II provides a detailed cross-reference of AN924 PINs and replacement SAE-AS5178 PINs.
Users are cautioned to evaluate replacements for their particular application.
CAUTION: The superseding information is valid as of the date of this specification and may be
superseded by subsequent revisions of the superseding document.
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