Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 125-3421 found under Stud Mounting by Engineered Electric Company. The National Stock Number assigned to this part is 5307007586518, and the Federal Supply Class is 5307 Studs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 125-3421.