Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 855017B0531 found under by Black And Company. The National Stock Number assigned to this part is 3820013397919, and the Federal Supply Class is 3820 Mining Rock Drilling Earth Boring And Related Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 855017B0531.