Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PB3-40 found under Slide Bearing Ball by Roller Bearing Co. The National Stock Number assigned to this part is 3110011158289, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PB3-40.