Anchor Chain 1 Grade U2/U3 2 Size 14mm-127mm 3 cert: ... be calculted would be a little different.3. 17.5mm link chain, would be produced by 18mm steel round bar, T.W ... =7.12kg/m4. 19mm link chain, would be produced by 20mm steel round bar, T.W ... =8.76kgs/m5. 44mm link chain, would be produced by 45mm steel round bar, T.W ...