Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R4 40X1 2 7601 found under Screw Machine by Wing Corp. The National Stock Number assigned to this part is 5305016570699, 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 R4 40X1 2 7601.