Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F85R found under Spark Plug by Zeller Corp The. The National Stock Number assigned to this part is 2920005408352, and the Federal Supply Class is 2920 Engine Electrical System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like F85R.