This code specifies the requirements for the material, dimensions, tolerances, construction, and finish of vitreous china wash basins, including both flat-back and angle-back (corner) variations.
Covers requirements for vitreous china wash basins.
Quick Reference Values
diameter of waste hole45 mm (nominal)
diameter of central tap hole28 mm (minimum)
tolerance for dimensions above 75mm± 5 percent
tolerance for dimensions below 75mm± 3 mm
Practical Notes
Ensure the tap hole size specified matches the selected sanitary fittings (e.g., standard pillar cocks vs. single lever basin mixers).
The waste hole dimension is intended to fit standard waste couplings; verify compatibility before installation to prevent leakage.
Always check for the presence and capacity of the integrated overflow slot to avoid accidental flooding during use.