Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12121000-1 found under Cable Assembly Special Purpose E by Williams Pyro Inc. The National Stock Number assigned to this part is 5995013797934, and the Federal Supply Class is 5995 Cable Cord And Wire Assemblies Communication Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 12121000-1.