Questions? Call us:
023 811 12681EN
Break down design barriers and grow your business with manufacturing available for you. Create and adapt.
Get Instant Quote Upload your CAD files and receive your custom CNC machining quote. Choose from a variety of materials to suit your needs.
CNC Machining
Tool Steel O1 is a classic oil-hardening, "non-shrinking" tool steel that can reach around 65 HRC from a low hardening temperature. We supply Tool Steel O1 CNC parts across the UK, from single prototypes to production runs.
It is a general-purpose grade chosen where alloy steels cannot deliver the required hardness, strength or wear resistance. As a result it is often specified for 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 before heat treatment, which produces only small dimensional changes. Send us a STEP file and we will quote your Tool Steel O1 CNC parts promptly, with UK-wide delivery. Finish options (as machined or ground) can be confirmed when you order.
Material
Tool Steel O1
Description
Strengths
Lead time 10 business days. Oil-hardening tool steel reaching high hardness with small dimensional change.
Weaknesses
Poor weldability
Silver grey
Ultimate tensile strength
2360 MPa
Yield strength
2140 MPa
Modulus of elasticity
219 GPa
Elongation at break
6.1%
Density
7.833 g/cm³
Hardness
255 HB
Shear modulus
Not specified
Corrosion resistance
Low
UK equivalent
Gauge plate (BO1)
Maximum service temperature
165–215°C
Thermal expansion coefficient
11.3–11.8 × 10⁻⁶ /°C
Thermal conductivity
41.2–44.6 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 O1 and may vary with stock condition. Please confirm critical properties before production.
Tool Steel O1 is machined in the annealed condition, then hardened. It is one of the easiest tool steels to machine and is often supplied as gauge plate (BO1) in the UK.
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 O1 is normally finished by oil 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.
O1 is an economical oil-hardening steel with good machinability and small dimensional change. A2 offers better stability for larger parts, and D2 offers much higher wear resistance.
The typical lead time shown for Tool Steel O1 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
Get Instant Quote
Subscribe for workflow updates and insights.
Review our privacy policy for details.
