Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PK57Z2-3CP found under Screw Tapping by Usm Corp. The National Stock Number assigned to this part is 5305006806430, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PK57Z2-3CP.