... Diameter: 10mm ~4000mm Butt weld loop loose with neck flangeFlange is a mechanical part which used ... weld loop loose type, Butt weld, Joint type with neck threaded, Integral type and Blind flange.D ... 1980 OCT tube flange with the admission criteria is similar to the German DIN standard, will not ... flange, Butt weld ring with loose with neck flange, Butt weld ring with loose with plate flange.D, flange ...