Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PCR66 found under Nut Self Locking Sl by Alcoa Global Fasteners Inc. The National Stock Number assigned to this part is 5310009618391, 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 PCR66.