Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS-42XS4 ITEM 2 found under Setscrew by Whitey Co. The National Stock Number assigned to this part is 5305013627229, 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 SS-42XS4 ITEM 2.