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The addition of lead to this grade permits the production of some 25% more parts with excellent finish and good tool life. Machinability is raised to 145 sfm. Like 4140 annealed, it responds well to heat treatment with good strength and wear resistance, excellent toughness, good ductility in the quenched and tempered condition.
| Shape |
Round, Hexagon, Flats |
| Grade |
4140 |
| Tolerance |
Meets cold finished carbon steel bar manufacturing tolerances |
| Application |
Highly stressed parts, or parts subject to severe wear. |
Round |
For best delivery lengths should be specified as 11'/13'. |
|
| Rounds |
Standard "as drawn" finish |
| Rounds |
Ground and Polished |
| Rounds |
Turned Ground and Polished |
| Rounds |
Turned and Polished |
| Rounds |
Rough Turned |
|
| Carbon |
0.38/0.43 |
| Manganese |
0.75/1.10 |
| Phosphorus |
0.035 (Max) |
| Sulphur |
0.04 (Max) |
| Silicon |
0.15/0.35 |
| Chromium |
0.80/1.10 |
| Molybdenum |
0.15/0.25 |
| Lead |
0.15/0.35 |
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