Matl ams 5591 or ams 5613, hardness rockwell c30-38
No other part numbers with same form, fit, and function found.
NSN 5998-01-006-8402
NSN 5996-01-467-7008
NSN 6685-01-060-3179
NSN 5930-01-611-0303
NSN 6620-00-526-4296
NSN 5905-01-478-6957
NSN 5930-01-025-1959
NSN 5975-01-596-3040
NSN 6650-01-633-9147
NSN 5835-01-125-6676
NSN 5895-00-494-0781
NSN 5925-01-467-0020