0.250 inch - 18 socket hd
No other part numbers with same form, fit, and function found.
A pipe fitting primarily designed for permanent installation during piping systems operations to fit into another pipe or pipe fitting for sealing. It usually is threaded.
NSN 6610-01-236-8359
NSN 5905-01-256-8829
NSN 5925-00-081-1170
NSN 5920-01-460-6740
NSN 5945-00-553-9963
NSN 5990-00-827-0684
NSN 5835-00-984-1233
NSN 6620-01-418-3245
NSN 4140-00-468-1117
NSN 2925-01-648-6859
NSN 6145-00-786-7980
NSN 6650-01-110-2142