Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 538278-40 found under Cover Electrical Co by Raytheon Company. The National Stock Number assigned to this part is 5935014819588, and the Federal Supply Class is 5935 Connectors Electrical. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 538278-40.