Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 358-4 found under Steel Tool by Bureau Of Mines Helium Operations. The National Stock Number assigned to this part is 9510009638501, and the Federal Supply Class is 9510 Bars And Rods. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 358-4.