One of the 3 mounting holes 0.313 in.
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 5920-01-497-9232
NSN 5975-00-156-5737
NSN 6320-00-701-0437
NSN 5835-01-090-0784
NSN 6240-00-413-4577
NSN 6650-00-964-9470
NSN 5855-01-484-6507
NSN 5990-01-386-5561
NSN 5945-01-241-4069
NSN 6150-01-520-7375
NSN 5855-00-174-3482
NSN 6240-00-635-9953