What it is
AN975 taper pin washer, Taper pin washer, screw size 5/16; A 21/64", D 13/64", E 5/64" (see the sheet's figure for A to F)
Equivalents
No equivalent on file: no maker document names one and the government catalog lists none on its stock number.
Install tooling, by who made the part
Not documented for this part number. Ask a tooling specialist →

Reference only: the drawing and its process spec govern. How to read this

Full detail: decode, cited documents, every stock number
AN975-5 | SpecLok