Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B46-20001-018 found under Coupler Optoelectro by Sfim Industries. The National Stock Number assigned to this part is 5980013290372, and the Federal Supply Class is 5980 Optoelectrical Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B46-20001-018.