Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST4M144-05003 found under Bushing Sleeve by Avalon Industries Inc. The National Stock Number assigned to this part is 3120011334530, 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 ST4M144-05003.