Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1001-20 found under Glass Window by Bureau Of Mines Helium Operations. The National Stock Number assigned to this part is 5620009558123, and the Federal Supply Class is 5620 Tile Brick And Block. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1001-20.