Altered item, modified castle nut, .1/4-20. Made from part number 91855a350, mcmaster carr
No other part numbers with same form, fit, and function found.
A nut having 6 flat sides, flat on the bottom and having a slotted cylindrical or dome shaped upper portion. It is designed to provide positive locking when used with a solid or split (cotter) pin. Excludes nut (1), plain, slotted, hexagon.
Classification: Nuts of iron or steel
NSN 6135-01-455-2233
NSN 5999-00-261-7972
NSN 5910-01-302-7131
NSN 5895-01-052-7332
NSN 6145-00-411-5828
NSN 6105-01-491-3006
NSN 5945-01-508-4344
NSN 6130-01-597-8665
NSN 6220-01-623-5919
NSN 5920-01-031-9903
NSN 6645-01-055-5465
NSN 5960-01-166-4021