One of the 3 holes will be 0.281 in. Dia
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 5975-01-421-3395
NSN 5990-01-512-9129
NSN 5965-00-518-0958
NSN 5895-00-515-6368
NSN 5950-00-063-4928
NSN 5965-01-361-4565
NSN 6145-00-932-1950
NSN 5905-00-906-9505
NSN 5996-00-005-4257
NSN 6610-00-504-2839
NSN 6105-01-443-2980
NSN 5915-01-573-5980