Understanding GI Pipe Grades and BIS Standards for Indian Construction

In India, galvanized iron pipes used in construction and plumbing must conform to standards set by the Bureau of Indian Standards (BIS). Understanding these grades ensures you procure pipes that are safe, durable, and compliant.

Key IS Standards for GI Pipes

• IS 1239 — Steel tubes for general engineering purposes (light, medium, heavy classes)
• IS 1161 — Steel tubes for structural purposes
• IS 3601 — Steel tubes for water and sewage
• IS 4923 — Hollow steel sections for structural use

Light, Medium, and Heavy — What Is the Difference?

The classification refers to the wall thickness of the pipe. Light-class pipes suit low-pressure applications, while heavy-class pipes handle high-pressure and structural loads. Always match the grade to the load and pressure your project demands.

All pipes at Bombay Hardware carry valid ISI markings and are sourced from BIS-certified manufacturers including JSW and TATA.