Tool steel selection is often treated as habit rather than a decision. O1 and A2 are two of the most common choices for shop tooling, and the differences between them affect heat treat cost, scrap risk, and how long a tool holds tolerance in service. Choosing deliberately can save both money and rework.
O1 is oil-hardening and hardens at comparatively lower temperatures, which makes it accessible for smaller shops and in-house heat treating. It machines well in the annealed condition and takes a fine edge, but it is more prone to distortion during quenching, which can mean added finish grinding on precision parts. For small batches of knives, punches, or fixtures, that tradeoff is often acceptable.
A2 is air-hardening and requires higher, more controlled heat treat temperatures. In exchange, it offers better dimensional stability through hardening, along with a strong balance of wear resistance and toughness. That combination is why it is widely used for punches, forming dies, shear blades, and gauges where holding size matters more than ease of heat treatment.
Metal Supermarkets Atlanta (Northwest) supplies tool steel cut to length with no minimum from our Marietta location. When your team specifies tool steel, is the deciding factor usually performance in service, or what your heat treat process can handle?
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Authentic close-up of tool steel bar stock on the racks at the Marietta location, or a customer's finished knife blank, punch, or die made from O1 or A2. Clean bar ends with grade markings visible work well. Real photos strongly preferred over stock. No Google Drive image folder is set up for this client yet, so request a real photo from the Marietta location.
Canva text suggestion: "Specify Tool Steel for the Job, Not by Habit" or "O1 vs. A2: Heat Treat Cost vs. Stability"