Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4 And 40UNC1 And 4CRES found under Screw Machine by Nylok Corporation. The National Stock Number assigned to this part is 5305000545647, 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 4 And 40UNC1 And 4CRES.