1215
Data verified1215 is a rephosphorized and resulfurized free-cutting steel with very low carbon, built purely for machining speed. It is one of the fastest-cutting bar steels available and a staple of high-volume screw machining.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.09 |
| Mn | 0.75–1.05 |
| P | 0.04–0.09 |
| S | 0.26–0.35 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Tensile strength | 380–460 MPa (hot rolled, typ.) |
| Machinability | ≈135% of 1212 (typ. rating) |
| Density | 7.85 g/cm³ |
Heat treatment
No hardening possible at this carbon level; used cold drawn for best finish.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | 1215 |
| jis | SUM25 (near) |
| gb | Y12 (near) |
Compare side by side: 1215 vs Y12 · 1215 vs 12L14 · 1215 vs 1117
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Screw-machine parts, fittings, connectors, small fasteners, electronic hardware.
Processing: Superb machinability and surface finish; poor weldability; low strength — never for structural or pressure parts.
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Ask for a quotationVisit NasteelSource: SAE J403 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.