Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 878 22 found under Roller Side Bearing by Bureau Of Mines Helium Operations. The National Stock Number assigned to this part is 2240009634213, and the Federal Supply Class is 2240 Locomotive And Rail Car Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 878 22.