5310-00-655-9509 (FFN836GPBTYPE1STYLE2)
NSN 5310-00-655-9509 (NIIN 00-655-9509) is a hexagon plain nut in Federal Supply Class 5310, Nuts And Washers — a nut, flat on top and bottom having 6 flat sides. Manufacturer part number FFN836GPBTYPE1STYLE2 (Federal Specifications Promulgated, CAGE 81348); also referenced as MS35691-628 (Military Standards).
Key specs: 163 brinell standard minimum hardness; full characteristics table below. NIIN assigned January 1961; DEMIL A (none required). Related NSN 5310-00-891-1751.