Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 200-974-21 found under Housing Bearing Uni by K W D Manufacturing Inc. The National Stock Number assigned to this part is 3130015707051, and the Federal Supply Class is 3130 Bearings Mounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 200-974-21.