Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 501 639 00 found under Glow Plug by Partz Network Llcjohn J Melton. The National Stock Number assigned to this part is 2920013485642, 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 501 639 00.