Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 308428 found under Combination Extension Tube by Mastsystem Intl Oy. The National Stock Number assigned to this part is 5340015832051, 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 308428.