... :1999 Grade4.NutsTo BS 970:Part 1:S304 Stainless Steel5.Flange Connecting Bolts for AdaptersHexagon bolts,with ... NomPipe MaterialsOD Range (mm)Connection Bolts Type 80mmDuctile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC88.1- ... -235.0M20*908"250mmDuctile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC272.0-289.0M24 ... *8010"300mmDuctile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC322.9-339.4M24 ...