Product Overview
Introducing the M2-PRO High-Speed Steel Bar — a premium-grade, precision-ground AISI M2 steel bar engineered for demanding metalworking and tooling applications. This 25mm Ø × 3000mm high-speed steel bar is manufactured to strict aerospace and industrial tolerances, delivering exceptional wear resistance, red hardness, and dimensional stability. Supplied in annealed condition, it offers optimal machinability prior to final heat treatment — making it ideal for custom toolmakers, die & mold shops, and OEM component fabricators sourcing reliable high-speed steel bar stock. As a benchmark AISI M2 steel solution, the M2-PRO grade ensures consistent chemistry (W6Mo5Cr4V2) and microstructure across every batch, enabling predictable hardening response and superior edge retention after quenching and tempering.
The M2-PRO designation reflects our proprietary melt control and homogenization process, which minimizes carbide segregation and enhances toughness without compromising hardness. With a post-hardened hardness of HRC 64–66, this annealed HSS bar serves as the foundational material for cutting tools, punches, taps, reamers, and cold work tooling requiring extreme abrasion resistance at elevated temperatures.
Key Features
- Premium AISI M2 (W6Mo5Cr4V2) composition with tight chemical tolerance
- Uniform annealed microstructure for consistent CNC machining and grinding
- Optimized for vacuum or salt-bath hardening to achieve stable HRC 64–66
- Low decarburization depth (<0.05 mm) and straightness tolerance ≤0.3 mm/m
- Full traceability: Mill test report (MTR) included with each bundle
- Available in standard lengths (3000 mm) and customizable cut-to-length options
Technical Specifications
| Parameter |
Value |
| Grade |
AISI M2 / W6Mo5Cr4V2 |
| Condition |
Annealed (softened for machining) |
| Diameter |
25 mm ±0.05 mm |
| Length |
3000 mm ±2 mm |
| Hardness (as-supplied) |
≤240 HB (approx. HRC 22–26) |
| Hardness (after heat treatment) |
HRC 64–66 |
| Density |
8.7 g/cm³ |
| Red Hardness |
Retains hardness up to 600°C |
| Carbide Distribution |
Uniform, fine-grained (ASTM 7–9) |
| Surface Finish |
Turned & ground, Ra ≤0.8 µm |
| Decarburization Depth |
≤0.05 mm |
| Straightness Tolerance |
≤0.3 mm per meter |
Applications
This high-speed steel bar is widely deployed in B2B manufacturing environments requiring ultra-durable tool steels. Key applications include: production of end mills, twist drills, gear cutters, and broaches; fabrication of cold heading dies, thread rolling dies, and precision punches; repair and refurbishment of worn tooling components; and R&D prototyping for high-performance cutting and forming tools. Its reliability as an AISI M2 steel substrate makes it a preferred choice among tier-1 suppliers serving automotive, aerospace, and energy equipment sectors — especially where consistent annealed HSS performance and repeatable hardening outcomes are mission-critical.
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