Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 939-1 found under Rod by Bureau Of Mines Helium Operations. The National Stock Number assigned to this part is 3441009697332, and the Federal Supply Class is 3441 Bending And Forming Machines. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 939-1.