Both hubs are also circular grooved on the ends
A cylindrical item having a full 360 degree (6.282 radians) complement of teeth on two or more surfaces. It may be a one-piece casting or composed of two or more separate items firmly held together by welding, rivets, pins, or the like, to form a single unit. It is designed to mount on a shaft. For items consisting of a shaft with an integral complement(s) or gear teeth, see gearshaft (as modified). Excludes gear subassembly, speed decreaser.
Classification: Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements entered separately
NSN 4140-01-586-9605
NSN 5925-00-379-0920
NSN 6685-01-136-2137
NSN 6320-01-414-7099
NSN 6220-01-502-6568
NSN 7035-01-207-8704
NSN 4140-01-520-4801
NSN 5985-00-390-7077
NSN 5920-01-356-0431
NSN 2925-01-181-3972
NSN 6685-01-229-9844
NSN 5920-00-152-4003