Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1243BM1665M5820 found under Motor Alternating Current by Western Sky Industries Inc. The National Stock Number assigned to this part is 6105000150971, 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 1243BM1665M5820.