IS 1239 Pipe Dimensions — Light, Medium & Heavy (Class A, B, C)
This chart gives IS 1239 (Part 1) mild steel tube dimensions in millimetres — outside diameter and wall thickness for Light (Class A, yellow band), Medium (Class B, blue band) and Heavy (Class C, red band) tubes from 15 to 150 NB, used for water, gas, air and general service in India.
Teshi Group stocks and supplies IS 1239 black and galvanised tubes, and manufactures the matching flanges and fittings.
Key to dimensions
- OD
- Outside diameter
- Wall
- Wall thickness by class
IS 1239 Pipe Dimensions — Light, Medium & Heavy (Class A, B, C) — tables
IS 1239 Part 1 tubes — OD and wall thickness (mm)
| NB | ODmm | Light (A)Wall · mm | Medium (B)Wall · mm | Heavy (C)Wall · mm |
|---|---|---|---|---|
| 15 | 21.3 | 2 | 2.6 | 3.2 |
| 20 | 26.9 | 2.3 | 2.6 | 3.2 |
| 25 | 33.7 | 2.6 | 3.2 | 4 |
| 32 | 42.4 | 2.6 | 3.2 | 4 |
| 40 | 48.3 | 2.9 | 3.2 | 4 |
| 50 | 60.3 | 2.9 | 3.6 | 4.5 |
| 65 | 76.1 | 3.2 | 3.6 | 4.5 |
| 80 | 88.9 | 3.2 | 4 | 4.8 |
| 100 | 114.3 | 3.6 | 4.5 | 5.4 |
| 125 | 139.7 | — | 4.8 | 5.4 |
| 150 | 165.1 | — | 4.8 | 5.4 |
Notes
- Light = Class A (yellow band), Medium = Class B (blue band), Heavy = Class C (red band).
- Mass per metre: use the pipe weight calculator with OD and wall thickness.
- Reference values for estimation and checking. Verify against the current edition of the standard and the purchase specification before design, purchase or fabrication.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
FAQ
IS 1239 Pipe dimensions — Light, Medium & Heavy (Class A, B, C): common questions
What is the difference between IS 1239 light, medium and heavy?
The outside diameter is the same; only the wall thickness changes — Light (A) is thinnest, Heavy (C) thickest. They are identified by yellow, blue and red colour bands.
Are IS 1239 tubes threaded?
They are supplied plain or screwed and socketed; threads are to IS 554 (BSP / ISO 7-1). Fittings are to IS 1239 Part 2.
Related products, data sheets and standards
IS 1239 Part 2 Steel Pipe Fitting dimensions
IS 1239 Part 2 mild steel screwed pipe fittings: sockets, elbows, tees, bends, return bends and nipples, in mm.
View online · PDFASME B36.10MPipe schedule chart — ASME B36.10M
Carbon and alloy steel pipe outside diameter, wall thickness and weight by schedule, NPS ⅛–48.
View online · PDF
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