MIL-DTL-23599B(AS)
3.5. Materials and manufacturing.
3.5.1 Forging. For manufacturers using forging, the rescue hook, including the auxiliary
ring, safety latch, lock and swivel fitting, shall be formed using 17-4PH steel alloy. The hook
shall be heat treated and hardened to a minimum of the H1025 condition in accordance with
SAE-AMS 5643.
3.5.2 Casting. For those manufacturers using investment casting that have undergone hot
isostatic pressing, cast the hooks using 17-4PH steel alloy. The hook shall be heat treated and
hardened to a minimum of the H1025 condition in accordance with SAE-AMS 5355. Hooks
that have undergone investment casting with hot isostatic pressing shall have an added safety
factor of 1.25 for all strength requirements.
3.5.3 Hardness. Indentations shall not be allowed in high stress areas.
3.5.4 Processes. Forging and casting processes shall not be mixed within each hook lot.
3.6 Environmental. When tested as specified in 4.7, the rescue hook shall not suffer a
decrease in structural integrity or operability. The hook shall be tested as specified in 4.6.1.2
following each environment test.
3.7 Identification of product. Each rescue hook shall be permanently and legibly marked in
accordance with MIL-STD-130. The identification detail shall include enterprise identifier, part
number, lot or batch number, and serial number.
3.8 Marking. In addition to any special marking required by the contract or order, marking
for shipment shall be in accordance with MIL-STD-129 and shall include the date of
manufacture, month and year.
RESCUE HOOK
MIL-DTL-23599
Federal Supply Code, FSC 4030
3.9 Workmanship. The rescue hooks shall be uniform in quality and shall be free from
irregularities or defects which would adversely affect performance, reliability, or durability.
4. VERIFICATION
4.1 Classification of inspections.
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.4).
4.2 First article inspection. The first article inspection of the rescue hooks shall consist of
examinations and tests for all of the requirements of this specification.
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