This flange is counter bored to accept the pipe before being fillet welded. The bore of the pipe and flange are both the same therefore giving good flow characteristics.

Standards: GB9112-9131,SH3406,ANSI B16.5 ,DIN25762766,DIN2632-2638

Pressure classes range: from 150lbs to 2,500lbs.

Sizes range: DN10-DN800.

Materials: Carbon steel, stainless steel and alloy steel.

Printing: Carbon steel and alloy steel with yellow print, black print, oil or zinc.

Size
Blind Flange: 3/8"～100" 
DN10～DN2500
Pressure 
American Series: CLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500, CLASS 2500 
European Series: PN 2.5, PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400 
Flange Facing Types 
American Series:Flat Face (FF), Raised Face (RF), Groove (G), Female(F), Ring Joints Face(RJ)