... testing conform to standard of AWWA/ANSI C219Center SleeveRolled Steel to BS EN 10025-1993 Grade S275End RingsDuctile iron ... mm)Bolt Length (mm)80Ductile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC88.1-102.4M12*1753" ... 6-127.8M12*1754"150Ductile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC158.2-181.6M12* ... 1-235.0M12*2008"250Ductile Iron,PVCu,Cast Iron,Steel,Cast Iron Met&Imp AC272.0-289.0M12*21510 ...