Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 173-3880 found under Motoralternating Current by Caterpillar Inc. The National Stock Number assigned to this part is 6105016789203, and the Federal Supply Class is 6105 Motors Electrical. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 173-3880.