Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9531 PIECE 20 found under Nut by Coffin Turbo Pump Inc. The National Stock Number assigned to this part is 5310011993339, 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 9531 PIECE 20.