Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S48-12-4219 found under Bushing Sleeve by Textron Systems Corporation. The National Stock Number assigned to this part is 3120003648042, 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 S48-12-4219.