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 6110-00-754-7926
NSN 5990-01-159-5988
NSN 6645-01-124-6277
NSN 6135-01-528-6896
NSN 6620-01-070-9042
NSN 6685-01-466-3185
NSN 6610-00-684-7683
NSN 5915-00-338-2556
NSN 5920-01-644-4621
NSN 6105-01-050-5878
NSN 5895-01-218-4258
NSN 4140-01-167-2812