O1 Tool Steel Sheet – Oil-Hardening Cold-Work Steel

O1 tool steel, also known as AISI 1.2510, is an oil-hardening cold-work tool steel.

It’s a carbon-manganese steel with excellent dimensional stability during heat treatment, making it ideal for precision tooling and engineering applications.

BSS supplies O1 tool steel sheet in the annealed condition, ready for machining, cutting, or further heat treatment as required.

O1 Chemical Composition

O1 Tool Steel

Carbon – 0.95%
Manganese – 1.25% max
Chromium – 0.5%
Vanadium – 0.2%
Tungsten – 0.5%

O1 Equivalent grades

Werkstoff nr. 1.2510
ASTM A681
BS BO1
BS UNS T31501
SAE J437
FED QQ-T-570
SAE J438

O1 Tool Steel Sheet – Typical Applications

O1 can be used for a range of applications, including:

Press tools & broaches
Rotary Cutters
Ground Flat Stock
Clipping, Marking Punches
Wear plates
Slitting cutters
Gauges
Deep drawing dies
Jigs
Screwing tools
Taps

Key Features of O1 Tool Steel Sheet

Carbon content: 0.95%

Excellent dimensional stability during heat treatment

Oil-hardening cold-work steel

Ideal for precision flat stock and tooling

Supplied in annealed condition for machinability

Thickness range: 2.46mm to 8.65mm

Hardness around 200 VPN

Typical Applications of O1 Tool Steel Sheet

O1 tool steel is ideal for a wide range of tooling and precision applications, including:

Press tools and broaches

Rotary cutters and slitting cutters

Ground flat stock for tool making

Clipping, marking punches and wear plates

Gauges, deep drawing dies, and jigs

Screwing tools and taps

O1 Tool Steel Sheet - Our Range

We typically supply O1 in a range of sheet sizes, from 2.46mm through to 8.65mm thick in a hardness of around 200vpn.

O1 Tool Steel Sheet - Condition Supplied

Annealed sheet for ease of machining and cutting
Sheet thickness range: 2.46mm – 8.65mm
Hardness approximately 200 VPN
Ready for oil hardening or further heat treatment

N.B. We do not supply Mill Certificates with orders, we only supply Certificates of Conformity.

Why Choose BSS for O1 Tool Steel Sheet?

📦 UK stock with fast delivery
⚙️ Precision flat sheet in custom thicknesses
✅ ISO9001 certified supplier
🔍 Technical support for cold-work tooling applications