IS 2556:2020 Part 5 is the Indian Standard (BIS) for vitreous sanitary appliances (vitreous china) - wash basins. 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.
Overview
- Status
- Current
- Usage level
- Frequently Used
- Domain
- MEP — Plumbing Fixtures and Valves
- Type
- Specification
Also on InfraLens for IS 2556
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
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.
Frequently referenced clauses
vitreous chinaceramicglaze
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values4
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
Tables & Referenced Sections
Key Tables
Table 1 - Dimensions of Flat Back Wash Basins
Table 2 - Dimensions of Angle Back Wash Basins
Key Clauses
Clause 4 - Types and Sizes
Clause 5 - Dimensions and Tolerances
Clause 6 - Construction Details (Waste and Overflow)
Clause 7 - Finish and Glazing
Frequently Asked Questions4
What is the standard diameter for the waste hole in a wash basin?+
The nominal diameter for the waste hole is typically 45 mm to accommodate standard plumbing waste couplings.
What is the standard diameter of the tap hole?+
The standard central tap hole diameter is typically 28 mm minimum, though it can vary based on specific fixture requirements.
What are the allowable tolerances for wash basin dimensions?+
General tolerances are ±5% for dimensions 75 mm and above, and ±3 mm for dimensions below 75 mm.
Are corner wash basins covered under this standard?+
Yes, angle-back (corner) wash basins are explicitly covered alongside flat-back wash basins.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.