Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9872B found under Bearing Sleeve by Ryerson Joseph T And Son Inc. The National Stock Number assigned to this part is 3120005801862, 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 9872B.