What it is
MS35338 helical spring lock washer, Lock washer, helical spring, regular (medium) series, nominal size 7/16 (.437); ID (A) .440-.450"; OD (B) .776" max, section thickness C .109" min (MS35338 Req. 4), width W .156" min
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

Every size and maker in the MS35338 series →

Full detail: decode, cited documents, every stock number
MS35338-66 | SpecLok