They have application in fuel and hydraulic systems. They are connected to a pipe or a hose.Specifications : Standard : DIN 7642 or as per customer specification Material : Mild Steel, EN 1AL(free cutting steel), 11SMnPb30, EN 8, S.S. 202, S.S. 304 Surface treatment : clear /yellow zinc plated, dacromet, geomet Type : plain(welding), groove (step), double side Common sizes : M10x5/16", M12x5/16", M14x5/16", M14x3/8", M16x3/8", M18x3/8",