Shandong Zhongnuo Heavy Industry Co.,Ltd.
GOST Flanges,GOST 33259 Flanges,GOST 12821 Flanges,Forged GOST Flanges
GOST Flanges is a Russian standard for flanges. GOST 12820-80 are Plane flanges. GOST 12836-67 are Blind Flanges. GOST 12821-80 are Welding Neck Flanges