Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 90508A031 found under Nut Plain Cap by Dayco Products Inc. The National Stock Number assigned to this part is 5310012366409, 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 90508A031.