Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E8CR106-021 found under Cap Filler Opening by Optex Systems Inc. The National Stock Number assigned to this part is 5340015635773, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like E8CR106-021.