Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A1PB04G found under Washer Lock by Allmetal Screw Products Corp. The National Stock Number assigned to this part is 5310014722583, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A1PB04G.