Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number L1-104-139 found under Screw Cap Socket Head by Wain Roy Co Inc. The National Stock Number assigned to this part is 5305012481295, 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 L1-104-139.