Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3728 found under Tip Electric Soldering Iron by Assembly Technologies International. The National Stock Number assigned to this part is 3439005407848, and the Federal Supply Class is 3439 Miscellaneous Welding Soldering And Brazing Supplies And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3728.