Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PN 20 found under Nut Self Locking Ro by Whittet Higgins Company. The National Stock Number assigned to this part is 5310015270862, 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 PN 20.