Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM-E-620309 found under Mounting Base Electrical Equipme by Y T And T Corp. The National Stock Number assigned to this part is 5975000898418, and the Federal Supply Class is 5975 Electrical Hardware And Supplies. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SM-E-620309.