4730-00-982-6418 (1131A48)
NSN 4730-00-982-6418 (NIIN 00-982-6418) is a packing nut in Federal Supply Class 4730, Hose, Pipe, Tube, Lubrication, And Railing Fittings — an item having internal and/or external machine thread(s) (threads other than pipe or hose series), specifically designed to retain, by means or groove(s). Manufacturer part number 1131A48 (Pneumo Abex Corp, CAGE 07111).
Key specs: 46 to 48 rockwell c material hardness; full characteristics table below. NIIN assigned January 1962; DEMIL A (none required).