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 5999-01-040-9525
NSN 6650-00-736-8456
NSN 6135-00-422-3967
NSN 6610-00-126-0894
NSN 5915-01-603-0012
NSN 5998-01-509-3214
NSN 5965-00-498-7538
NSN 6240-01-616-6813
NSN 6220-01-069-3685
NSN 2925-01-206-7948
NSN 6150-00-636-8938
NSN 5935-01-486-5672