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
Grade	4140
Tolerance	Meets cold finished carbon steel bar manufacturing tolerances
Application	Use when faster machining speeds than those afforded by non-leaded 4140 annealed are desired.

Specifications

Back to Top

Available Sizes

Rounds All popular sizes

Available Length

Round 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

Chemistry

Back to Top

Chemistry

Carbon 0.38/0.43 Maganese 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