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Contact Supplier| For Size | Tolerance |
| 48.3 mm and less | +0.40 mm -0.80 mm |
| 60.3 mm and above | +/-1% |
| The Tolerances on the wall shall be as follows : | thickness of line pipes |
| Type | For | Tolerance |
| Pipes | 73.0 mm and smaller | +20.0% -12.5% |
| Â | 88.9 mm O.D. & Larger | +18.0% -12.5% |
| Grade YST - 210 and YST - 240 | +10.0% -3.5% |
| Grade YST -170 | +10.0% -5.0% |
| Car loads lots For min 18000 Kg : Grade YST 210 & YST 240 GRADE YST 170 | -1.75% -2.5% |