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 4140-00-943-7434
NSN 5915-01-100-7062
NSN 5915-01-244-9066
NSN 5930-00-913-8942
NSN 6620-01-352-5640
NSN 2925-01-327-3069
NSN 5905-01-443-3551
NSN 6650-00-113-7698
NSN 5950-00-615-6535
NSN 5855-01-364-1005
NSN 5945-00-905-3997
NSN 6610-01-520-3164