niag lasalle

4140 Leaded

Specifications Chemistry




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.



Available Sizes
All popular sizes

Available Length
For best delivery lengths should be specified as 11'/13'.

Available Finishes
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