5305-00-655-9570 (FFS86TYPE1STYLE11)
NSN 5305-00-655-9570 (NIIN 00-655-9570) is a socket head cap screw in Federal Supply Class 5305, Screws — an externally threaded fastener whose threaded portion is of one nominal diameter. Manufacturer part number FFS86TYPE1STYLE11 (Federal Specifications Promulgated, CAGE 81348); also referenced as MS35457-44 (Military Standards).
Key specs: 36 to 43 rockwell c overall hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required). Related NSN 5305-00-978-9388.