Hub has internal serrations
A toothed wheel whose teeth or sprockets are designed to be engaged with the links of a pitch chain, track, or the like. It is usually used for transmitting power.
Classification: Chain sprockets and parts thereof
NSN 5910-01-232-3447
NSN 5975-01-327-3950
NSN 5975-01-256-6422
NSN 5925-00-290-4451
NSN 6220-00-178-8536
NSN 5998-01-323-6425
NSN 6320-01-606-2508
NSN 5996-01-476-1126
NSN 6105-00-120-9601
NSN 6110-01-061-3523
NSN 5960-00-517-6206
NSN 5920-01-628-0995