Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D5-28 found under Bearing Sleeve by Western Sky Industries Inc. The National Stock Number assigned to this part is 3120005404842, 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 D5-28.