U6S- fine thread UNF thread 8.8 FZB , Bright zinc plated FU6S 1/4UNFx13 8.8 FZB ANSI B18.2.1 FINGE THREADED SEX CHANNEL SCREW BLANK The size thickness is given in TUM and the length is given in MM ( millimeters ) Steel grade 8.8 Sold by the piece We have a wide range of Bolts, screws and fasteners at the lowest prices in Sweden