Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MS13987-1-9733 found under Bearing Half Sleeve by Chief Of Engineers. The National Stock Number assigned to this part is 3120003749733, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MS13987-1-9733.