Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D2506 found under Nut Plain Slotted H by Koehring Co. The National Stock Number assigned to this part is 5310002660490, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D2506.