First gear is antibacklash gear
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 5935-01-238-2904
NSN 5960-01-567-1096
NSN 5930-00-832-5714
NSN 4140-00-192-0269
NSN 5945-01-358-5663
NSN 5915-01-447-4515
NSN 6150-01-267-4962
NSN 6135-01-362-4256
NSN 5975-01-084-6732
NSN 5960-00-285-1001
NSN 6220-01-171-6976
NSN 5950-01-061-9384