OHNS (1.2510) Tool Steel

OHNS (Oil Hardening Non-Shrinking): The Precision Toolmaker’s Choice. Reliable, easy-to-machine steel for jigs, fixtures, and gauges.

OHNS (1.2510) Tool Steel

OHNS (AISI O1) is a manganese-chromium-tungsten alloyed tool steel. It is favored by toolmakers for its ease of machining in the annealed state and its "non-shrinking" characteristics during oil quenching, ensuring the final part matches the design dimensions.

Chemical Composition	Percentage %
Chromium	0.60%
Carbon	0.95%
Manganese	1.10%
Silicon	0.25%
Vanadium	0.10%
Tungsten	0.60%

The heat treatment cycle for OHNS tool steel should be carefully designed based on the component’s size, cross-section, and geometry to achieve consistent hardness and dimensional accuracy. Key parameters such as heating temperature, controlled cooling rate, and soaking duration may vary depending on the specific shape and service requirements of each part. Additional factors, including furnace configuration, choice of quenching medium, and the efficiency of workpiece transfer systems, also have a direct impact on the final metallurgical properties. For the most effective results, it is recommended to consult experienced heat treatment specialists for grade-specific process guidance.

Certified Quality Assurance

At Progressive Metal Manufacturing, we maintain a rigorous quality management system to ensure that every batch of OHNS (Oil Hardening Non-Shrinking) tool steel meets the highest industrial standards. Our supply chain is fully compliant with ISO 9001 protocols, providing a foundation of traceability and dimensional stability. For precision engineers, this means receiving a high-performance steel that minimizes the risk of cracking or distortion during heat treatment, allowing for predictable results in the most intricate tool-making processes.

Industrial Applications & Versatility

OHNS (O1) is a general-purpose, oil-hardening tool steel recognized for its excellent abrasion resistance and edge-holding capabilities.

Its specialized alloy composition makes it the industry standard for a vast array of high-precision components and cutting tools:

Tooling & Die Work: Ideal for medium-run dies, intricate press tools, drawing punches, trimmer dies, and master cavity sinking hobs.

Precision Gauges: Extensively used in the production of plug gauges, thread gauges, and high-accuracy measuring instruments.

Industrial Cutting: A preferred choice for paper-cutting knives, cloth cutters, strip slitting cutters, and woodworking knives.

Machine Components: Essential for durable lathe centers, chuck jaws, bushings, cams, collets, and tube expander rolls.

Precision Supply & Custom Specifications

We provide a versatile range of OHNS steel formats, expertly processed to match your specific engineering blueprints.

Our facility utilizes advanced sawing technology to deliver materials ready for immediate production,

reducing your internal lead times and material waste.

Our inventory capabilities include:

Round Bar: Sawn to your required lengths with diameters available from 16⌀ to 250⌀.

Plate & Sheet: Stock thicknesses ranging from 16mm to 80mm.

Custom Geometric Cuts: Precision rectangular sections, blocks, and flat bars sawn to your unique geometric requirements.

Our technical sales team is standing by to assist with custom tolerances and logistical planning to ensure your raw materials arrive ready for the machine shop.