| Metal |
Pattern Oversize Factor (each direction) |
Finish Allowance
(smaller number for larger sizes) |
Min Wall
mm
(inches) |
| Aluminum |
1.08 - 1.12 |
0.5 to 1.0 % |
4.75 (0.187) |
| Copper alloys |
1.05 - 1.06 |
0.5 to 1.0 % |
2.3 (0.094) |
| Gray Cast Iron |
1.10 |
0.4 to 1.6 % |
3.0 (0.125) |
| Nickel alloys |
1.05 |
0.5 to 1.0 % |
N/A |
| Steel |
1.05 - 1.10 |
0.5 to 2 % |
5 (0.20) |
| Magnesium alloys |
1.07 - 1.10 |
0.5 to 1.0 % |
4.0 (0.157) |
| Malleable Irons |
1.06 - 1.19 |
0.6 to 1.6 % |
3.0 (0.125) |
