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 5990-01-588-3999
NSN 6220-00-862-6216
NSN 6650-01-212-3964
NSN 6135-01-518-9813
NSN 7035-00-009-0099
NSN 5855-01-624-7115
NSN 5965-01-396-7508
NSN 5999-00-727-9147
NSN 6150-01-047-8626
NSN 5990-00-060-0012
NSN 7035-00-193-2269
NSN 6150-00-928-2960