Classes
IS 1239 tubes are supplied in Light (L), Medium (M) and Heavy (H) classes. The outside diameter is fixed for each nominal bore; the class changes the wall thickness. Medium class is the usual reference for plumbing and general service.
Nominal bore and outside diameter
| Nominal bore (NB) | Outside diameter (mm) |
|---|---|
| 15 | 21.3 |
| 20 | 26.9 |
| 25 | 33.7 |
| 32 | 42.4 |
| 40 | 48.3 |
| 50 | 60.3 |
| 65 | 76.1 |
| 80 | 88.9 |
| 100 | 114.3 |
| 125 | 139.7 |
| 150 | 165.1 |
Ends and finish
State black or galvanized, and ends: plain, bevelled, or screwed and socketed.