Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3-4-1-7 found under Thrust Tie Down Yok by Celtech Corporation. The National Stock Number assigned to this part is 4920004476482, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3-4-1-7.