  |
 |
| Linear Tolerances | |||
| Sand | Permanent Mold (machined mold cavity) | ||
| Basic tolerance up through 6" | ±.030 | ±.015 | Tolerances are from print to sample, through the pattern stage. |
| Additional tolerance each inch > 6" | ±.003 | ±.002 | Repeatability will be much closer. |
| |||
| Most Common Alloys (Scale: 1-5... 1 is best) | ||||||||
| ALLOY | 319F | 319T6 | SR319F | A356T6 | 535F | 713F | 771F | 771T71 |
| ULTIMATE | 27000 | 36000 | 31000 | 40000 | 35000 | 32000 | 44000 | 48000 |
| YIELD | 18000 | 24000 | 27000 | 30000 | 18000 | 22000 | 36000 | 45000 |
| ELONGATION (%) | 2 | 2 | 1 | 6 | 9 | 3 | 3 | 2 |
| BRINELL | 55-85 | 65-95 | 70-95 | 70-105 | 60-90 | 60-90 | 85-115 | 105-135 |
| MACHINABILITY | 3 | 3 | 2 | 3 | 1 | 1 | 1 | 1 |
| CORROSION RESISTANCE | 3 | 3 | 3 | 2 | 1 | 3 | 3 | 3 |
| ANODIZE | 4 | 4 | 4 | 4 | 1 | 1 | 1 | 1 |
| CASTABILITY | 2 | 2 | 2 | 1 | 5 | 4 | 3 | 3 |