Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number THPC53 found under Nut Self Locking Castellated Hexagon by Simmonds Precision Products Inc. The National Stock Number assigned to this part is 5310013281125, 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 THPC53.