| PERMISSIBLE DEVIATIONS ON DIMENSIONS, CLASS 2 | |||||||||
| NOMINAL DIMENSIONS OF ROUGH CASTINGS | OVER ALL DIMENSIONS | ||||||||
| Over | Up to | Up to 6 | Over 6 up to 10 | Over 10 up to 18 | Over 18 up to 30 | Over 30 up to 80 | Over 80 up to 180 | Over 180 up to 300 | Over 300 up to 500 |
| - | 6 | ± 0.10 | ± 0.12 | ± 0.15 | ± 0.20 | ± 0.25 | ± 0.25 | ± 0.30 | ± 0.35 |
| 6 | 10 | - | ±0.12 | ±0.15 | ±0.25 | ±0.25 | ±0.30 | ±0.35 | ±0.45 |
| 10 | 18 | - | - | ±0.20 | ±0.30 | ±0.35 | ±0.35 | ±0.40 | ±0.55 |
| 18 | 30 | - | - | - | ±0.30 | ±0.40 | ±0.45 | ±0.50 | ±0.65 |
| 30 | 80 | - | - | - | - | ±0.45 | ±0.55 | ±0.60 | ±0.75 |
| 80 | 180 | - | - | - | - | - | ±0.60 | ±0.70 | ±0.90 |
| 180 | 300 | - | - | - | - | - | - | ±1.00 | ±1.15 |
| 300 | 500 | - | - | - | - | - | - | - | ±2.00 |
| PERMISSIBLE DEVIATIONS ON CENTRE TO CENTRE, DISTANCE BETWEEN HOLES, BOSSES ETC. | |||||||||
| NOMINAL DIMENSIONS | NOMINAL DIMENSIONS | PERMISSIBLE DEVIATION | |||||||
| Over | Up to | Class 2 | |||||||
| 6 | ±0.125 | ||||||||
| 6 | 10 | ±0.125 | |||||||
| 10 | 18 | ±0.15 | |||||||
| 18 | 30 | ±0.25 | |||||||
| 30 | 80 | ±0.35 | |||||||
| 80 | 180 | ±0.45 | |||||||
| 180 | 300 | ±0.70 | |||||||
| 300 | 500 | ±0.90 | |||||||
| PERMISSIBLE MACHINING ALLOWANCE | |||||||||
| NOMINAL DIMENSION | OVERALL DIMENSIONS (MM/FACE) | ||||||||
| Over | Up to | 6 | 06 - 10 | 10-18 | 18-30 | 30-80 | 80-180 | 100-300 | |
| - | 6 | 0.3 | 0.35 | 0.4 | 0.5 | 0.7 | 1 | 1 | |
| 6 | 10 | - | 0.35 | 0.4 | 0.5 | 0.7 | 1.25 | 1.5 | |
| 10 | 18 | - | - | 0.5 | 0.6 | 0.7 | 1.25 | 1.5 | |
| 18 | 30 | - | - | - | 0.6 | 0.8 | 1.4 | 1.75 | |
| 30 | 80 | - | - | - | - | 1 | 1.6 | 2 | |
| 80 | 180 | - | - | - | - | - | 2 | 2.25 | |
| 180 | 300 | - | - | - | - | - | - | 3 | |
