Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WC939-3-12F found under Screw Close Toleran by West Coast Aerospace Inc. The National Stock Number assigned to this part is 5305013248861, 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 WC939-3-12F.