Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3-7-5-398F found under Balloon Meteorological by Multek Flexible Circuits Inc. The National Stock Number assigned to this part is 6660001153686, 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 3-7-5-398F.