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CNC Machining
Tool Steel A2 is a versatile air-hardening tool steel with good toughness and excellent dimensional stability during heat treatment. Through our UK CNC machining service, Tool Steel A2 CNC parts can be produced as one-off prototypes or repeat batches.
Its wear resistance sits between O1 and D2, giving an effective balance of strength, toughness, tool performance and price. Typical uses include punches, dies & chuck jaws, plastic injection tooling and industrial knives & hammers. Its quoted tensile strength of around 2360 MPa gives a useful guide when sizing parts.
Parts are CNC milled or turned in the annealed state and can be hardened afterwards, keeping distortion to a minimum. Upload your CAD file for a quick quote on CNC machining Tool Steel A2, with delivery anywhere in the UK. Finish options (as machined or ground) can be confirmed when you order.
Material
Tool Steel A2
Description
Strengths
Lead time 10 business days. Air-hardening tool steel with good toughness and minimal distortion in heat treatment.
Weaknesses
Less wear-resistant than D2
Silver grey
Ultimate tensile strength
2360 MPa
Yield strength
2140 MPa
Modulus of elasticity
219 GPa
Elongation at break
6.1%
Density
7.861 g/cm³
Hardness
250 HB
Shear modulus
Not specified
Corrosion resistance
Low
UK equivalent
Maximum service temperature
195–245°C
Thermal expansion coefficient
10.5–11 × 10⁻⁶ /°C
Thermal conductivity
36.1–39 W/(m·°C)
Electrical resistivity
Not specified
Heat treatment
Hardening & tempering
Recommended finish
As machined or ground
Punches, dies & chuck jaws
Plastic injection tooling
Industrial knives & hammers
Dowel pins & gauges
Values shown are typical supplier figures for Tool Steel A2 and may vary with stock condition. Please confirm critical properties before production.
Tool Steel A2 is machined in the annealed condition, then hardened. It machines well when annealed and moves very little during air hardening.
Heat treatment after machining can cause slight size change, so critical features may be finished by grinding after hardening. Achievable tolerances depend on part size, geometry and features, so mark any critical tolerances on a 2D drawing with your upload and they will be reviewed and confirmed in your quote.
Tool Steel A2 is normally finished by air hardening and tempering. Parts can be supplied as machined or ground. Please state the hardness you need on your drawing.
Typical uses include punches, dies and chuck jaws, plastic injection tooling, industrial knives and wear parts, and dowel pins and gauges.
A2 is tougher than D2 but less wear resistant. It distorts less in heat treatment than O1, which makes it a good general-purpose cold-work steel.
The typical lead time shown for Tool Steel A2 is 10 business days from an approved order. Heat treatment can add time. Quantity, finishing and any heat treatment can affect this, and your quote confirms the date before you order.
Parts in as fast as 10 business days
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