Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S31B566CSI found under Nutplainblind Rivet by Bollhoff Inc. The National Stock Number assigned to this part is 5310016934591, 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 S31B566CSI.