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 6110-00-148-8536
NSN 6620-00-100-4517
NSN 6150-00-011-0111
NSN 5975-01-634-0678
NSN 6240-01-450-0873
NSN 6110-01-165-3196
NSN 6220-00-533-3936
NSN 5930-01-435-1396
NSN 5998-01-416-5050
NSN 6320-00-521-9350
NSN 6650-00-155-8431
NSN 5999-01-558-9511