SO flange ,as the meaning of name ,is a flange slipping on the pipe or fitting when connection. The pipe should be insert the flange inner bore ,and leave a bit distance from the face of the flange to make sure it will not effect the sealing of two flanges.

Yellow paint B2220 SS400 SO Flange

Standard:

ASME/ANSI B16.5,ASME B16.47,ASME B16.36,AWWA C207.DIN 2527,2573,2576,2631,2632,2633,2634,2635,2566,2642.EN 1092,BS 4504,JIS B2220,GOST 10820,10821 etc.

Material:

Carbon Steel:ASTM A105,A350 LF2,SS400,P235GH,P250GH,C22.8,Q235,20#,16Mn.

Stainless Steel:ASTM A182 F304,F304L,F316,F316L,F321,F347,F310,F44,F51 etc.

Alloy Steel:ASTM A694 F42,F46,F52,F56,F60,F65,F70,A182 F5,F9,F91,F12,F11,F22 etc

Coating:

Black paint,Yellow paint,Vanish oil