Haihao Group Plate/Flat Flange Products Standard:

BS 4504,

DIN 2573,DIN 2576,DIN 2501,DIN 2502,DIN 2503,DIN 2543,DIN 2544,DIN 2545,

EN 1092,

GOST 12820,

UNI 2276,UNI 2277,UNI 2278,UNI 6083,UNI 6084

Hebei Haihao High Pressure Flange Pipe Fitting Group Co was established in 1982,located in Mengcun County—the hometown of pipe fittings in China. We are the first and one of the biggest companies which can produce pipe fittings,flanges and steel pipes