Union Cross – Tube Butt Weld Union Cross – Tube Butt WeldPart NoT Tube O.D. (mm)t Wall Thickness (in.)LBFWork. Press, (psi)FAV-M06TBW-SS61.816.39.79.512660FAV-M08TBW-SS81.816.39.79.58320FAV-M10TBW-SS102.218.09.711.18160