Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 23642 4 found under Holder Lampholder by Reliance Electric Industrial Co. The National Stock Number assigned to this part is 6250012452345, and the Federal Supply Class is 6250 Ballasts Lampholders And Starters. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 23642 4.