Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS4045-4P23 found under Bushing Sleeve by Sikorsky Aircraft Corporation. The National Stock Number assigned to this part is 3120005854705, 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 SS4045-4P23.