AISI 12L14 is a free-machining carbon steel designed for high-speed machining and efficient production of precision components. It is widely used for fittings, fasteners, bushings, and small turned parts.
AISI 12L14 is a leaded free-machining carbon steel valued for its excellent machinability, surface finish, and suitability for high-volume automatic machining operations. Its composition is designed to support efficient chip formation and reduce machining time when producing intricate or repetitive components.
The grade is commonly used for fittings, bushings, fasteners, connectors, threaded parts, and precision-turned components. It is particularly useful in applications where dimensional consistency and manufacturing productivity are important. However, its weldability, corrosion resistance, and suitability for certain regulated applications require careful evaluation. Its lead content may also impose restrictions depending on the application and applicable regulations. Typical Applications: CNC-turned parts, fittings, bushings, fasteners, connectors, and precision components.Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.15% |
| Manganese (Mn) | 0.85% | 1.15% |
| Phosphorus (P) | 0.040% | 0.090% |
| Sulfur (S) | 0.260% | 0.350% |
| Lead (Pb) | 0.150% | 0.350% |
| Silicon (Si) | — | 0.10% |
| Iron (Fe) | Balance | Balance |
| Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength (Ultimate) | 540 – 600 MPa | 78,000 – 87,000 psi |
| Yield Strength | 415 – 515 MPa | 60,000 – 75,000 psi |
| Elongation at Break (in 50 mm) | 10% – 15% | 10% – 15% |
| Reduction of Area | 35% – 40% | 35% – 40% |
| Hardness (Brinell - HBW) | 163 – 179 HB | 163 – 179 HB |
| Hardness (Rockwell B - HRB) | 84 – 88 HRB | 84 – 88 HRB |
| Modulus of Elasticity (Young's) | 200 GPa | 29,000 ksi |
| Densit | 7.87 g/cm³ | 0.284 lb/in³ |
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