NPFC - MIL-HDBK-57
LISTING OF FASTENER MANUFACTURER’S IDENTIFICATION SYMBOLS
|Publication Date:||31 July 2017|
This handbook provides a listing of identifying head markings of companies that have submitted their information. This handbook contains the names, addresses, and the symbols of all relevant fastener manufacturers. This handbook is for guidance only and cannot be cited as a requirement.
This handbook provides guidance in the identification of head marking of fasteners