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 5950-00-055-5091
NSN 6650-00-283-0978
NSN 5915-01-223-6411
NSN 2925-00-071-4197
NSN 5985-01-535-9418
NSN 5905-01-260-3923
NSN 5996-01-033-6344
NSN 5999-00-503-8028
NSN 6135-01-570-4284
NSN 5960-00-153-4669
NSN 5990-01-219-2703
NSN 5855-01-020-7982