Material is grade c per astm-a563
No other part numbers with same form, fit, and function found.
A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
Classification: Nuts of iron or steel
NSN 6650-01-231-9545
NSN 6130-00-776-6081
NSN 5930-00-737-6100
NSN 4140-01-179-0797
NSN 5985-01-231-3732
NSN 6150-00-176-3584
NSN 5895-01-232-0734
NSN 6320-00-857-4073
NSN 5925-01-489-2791
NSN 5945-01-357-9413
NSN 6145-00-419-0550
NSN 5930-01-090-0223