Flanges are designed to confirm to O ring groove, bolt holes and bolt pattern dimensions of either code 61 or code 62 of SAE J518 and ISO 6162-1 or ISO 6162 – 2 except for those with square mounting hole pattern.Type,Socket Weld, Butt Weld, Split, Screwed, Blind, SAE, SAE Flanges with 24º EO Cone, CETOP