Tool and Die Steel O1 Bars

Aiman Metals is a reputable manufacturer and supplier of Tool and Die Steel O1 bars, proudly based in Kuala Lumpur, Malaysia. They’ve built a solid reputation for delivering precision-engineered steel products, with their O1 tool steel bars meeting international quality standards, making them perfect for cold work applications. With a strong focus on durability, accuracy, and customer satisfaction, Aiman Metals caters to a variety of industries, including automotive, tooling, and engineering. Their O1 steel bars come in various sizes and specifications, providing tailored solutions for diverse industrial needs. Aiman Metals is well-known for its reliability, quick delivery, and competitive pricing throughout Malaysia and Southeast Asia.

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O1 Tool Steel Round Bar

Die Steel O1 Rods

O1 Tool and Die Steel Bar

What is Tool and Die Steel O1 Bars?

TO1 tool steel is an oil-hardening, cold work steel that consists of Carbon (0.85–1.00%), Chromium (0.40–0.60%), Manganese (1.00–1.20%), Tungsten (0.50–0.60%), along with trace amounts of Vanadium, Silicon, and Iron. It boasts high dimensional stability, impressive wear resistance, and remarkable hardness after heat treatment—typically achieving 57–62 HRC. In its hardened state, O1 can provide a tensile strength of up to 1,200 MPa. Renowned for its ease of machining when annealed, O1 is a favored choice for precision tools that demand sharp edges, durability, and consistent performance under pressure.

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Tool and Die Steel O1 Bars Specifications

Standard : ASTM A681, ASME SA681
Dimensions : EN, DIN, JIS, ASTM, BS, ASME, AISI
Form : Round
Diameter : 10 mm ~ 900 mm
Size : 0.08 mm to 25.00 mm
Diameter Range : 0.040 mm – 12 mm (0.0016” – 0.4724”)
Application : Lathe Tools, Milling Cutter, Cutter Blades, Boring Tools, Twist drills, Milling Knives, Reamers, Taps, Metalcutting saws, Screw Cutting Tools, File Cutter’s Chissels, Drills, Hobs, Drill Bits, Tread cutting tools etc

Chemical Compositions of Tool and Die Steel O1 Bars

CHEMICAL PROPERTIES	O1 STEEL (%)
Carbon	0.85-1.00
Manganese	1.00-1.40
Silicon	0.50
Chromium	0.40-0.60
Nickel	0.30
Tungsten	0.40-0.60
Vanadium	0.30
Copper	0.25
Phosphorus	0.03
Sulfur	0.03

Mechanical Properties of Tool and Die Steel O1 Bars

MECHANICAL PROPERTIES	O1 STEEL (Imperial)
Tensile Strength	245000 psi
Yield Strength	218000 psi
Elongation at Break	0.00%
Modulus of Elasticity	31000 ksi
Hardness (Rockwell)	50
Hardness (Vickers)	517
Hardness (Knoop)	513

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Equivalent Grades of Tool and Die Steel O1 Bars

Country	USA	German	Japan
Standard	ASTM A681	DIN EN ISO 4957	JIS G4404
Grades	O1	1.2510/100MnCrW4	SKS3

Thermal Properties of Tool and Die Steel O1 Bars

Properties		Conditions
Properties		T (°C)	Treatment
Thermal expansion	10.6 x 10^-6/ºC	20-260	–

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Tool and Die Steel O1 Bars Types

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Tool and Die Steel O1 Bars Uses

Tool and Die Steel O1 bars are extensively utilized in cold work applications thanks to their outstanding hardening capabilities and dimensional stability. They’re perfect for crafting precision cutting tools, blanking dies, punches, broaches, and forming tools. O1 is also a popular choice in knife making, woodworking tools, and gauges where a sharp, long-lasting edge is essential. Its ability to retain hardness and resist wear makes it ideal for applications that involve moderate impact and abrasion. Plus, O1’s machinability in the annealed state and excellent finish after heat treatment further enhance its appeal in various industrial settings.

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