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 5935-00-494-7285
NSN 4140-00-105-0599
NSN 6110-01-468-7054
NSN 6685-00-593-2257
NSN 6150-00-007-6712
NSN 5975-01-173-2511
NSN 5835-00-378-1429
NSN 5999-01-093-0963
NSN 7035-01-211-5636
NSN 6135-00-519-1325
NSN 5990-01-287-1682
NSN 5975-00-118-8844