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Answer:

MIL-P-45952 is the classification of heavy duty Detent Pins.

This is the timeline of the detent pins Military Specification:

Time-line What happened to detent pins
1991 – 1999 Detent pins were already on their own spec MIL-P-45952 with a single spec-sheet /1. No QPL was mandated; the spec only calls for first-article and lot conformance tests.
29 Jun 2000 Nothing changed. MIL-P-45952 stayed in force, still without a QPL.
11 Aug 2014 MIL-P-45952 was updated to MIL-DTL-45952A (detail spec). The slash-sheet MIL-P-45952/1 was simply re-validated (last Notice 4: 10 Sep 2019).

 

All of our heavy duty detent pins are in accordance with MIL-DTL-45952A.