Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1D10025 ITEM 28 found under Washer by Vacco Industries. The National Stock Number assigned to this part is 5310012103281, 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 S1D10025 ITEM 28.