A machined item with internal and external threads with the cut to hold the o-ring, a .625 dia, length is about .8 inch and diam is 13/16 hex min.
No other part numbers with same form, fit, and function found.
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), shoulder(s), and the like, packing and/or a packing gland within a stuffing box. See also bushing, machine thread; inverted nut, tube coupling; and nut, tube coupling. Excludes packing nut, stuffing tube; and use with electrical cable, and locknut, pipe.
NSN 6240-01-264-9586
NSN 6645-00-226-2270
NSN 5965-01-118-6302
NSN 5990-01-267-6971
NSN 5965-01-040-4178
NSN 5915-00-514-2098
NSN 5895-01-573-6435
NSN 6650-01-088-1200
NSN 6150-01-171-6192
NSN 4140-01-546-3644
NSN 6610-01-019-9233
NSN 6130-01-196-8283