3460-00-254-3032 (A-A-51129)
NSN 3460-00-254-3032 (NIIN 00-254-3032) is a solid machine mandrel in Federal Supply Class 3460, Machine Tool Accessories — a cylindrical-shaped tool with a slight taper on the over-all length, centered on each end with a flat milled on the ends for a holder. Manufacturer part number A-A-51129; also referenced as A-A-51129 TY I SIZE 2 (Federal Commercial Item Description); OO-M-251 (Federal Specifications Promulgated).
Key specs: hardened (heat treated) finish, ground finish; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required); export Schedule B 8466.93.3050.