GOST /ГОСТ 12821 Welding neck flange Dimensions PN63 6.3Mpa Download the PDF    PDF file: GOST /ГОСТ 12821 Welding neck flange Dimensions PN63 6.3Mpa   All dimensions are in "mm" and All weights are in "kg" unless noted otherwise specified. you may also check non standard sizes flange weight online calculation,flange surface area online calculation,flange