Imperial Square Ground Flat Stock

Our collection of ground flat stock is grade 1.2510 tool steel (AISI O1)  and is available for purchase in various imperial and metric sizes. Mostly, these metals are used for toolmaking as a result of their saw-cut ends, ground edges, and surfaces. Moreover, the annealed condition of the material means that it can be easily shaped to adhere to the unique requirements of each and every project.

Advantages and Features

Ground flat stock comes with multiple advantages, with one of the most significant being its cutting edge. This is because the cutting edge offers longevity, strong wear resistance, and durability. In addition to this, the extensive range of sizes means that users can select their exact required size, avoiding excessive wastage. Lastly, the high dimensional stability of these items means that they’re able to withstand some of the harshest temperatures and environments.

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Common Uses

Thick ground flat stock has multiple applications, including the following:

  • Press tools
  • Broaches
  • Bushings
  • Lathe centres
  • Chuck jaws
  • Master cavity sinking hobs
  • Plug gauges
  • Thread gauges
  • Precision measuring tools
  • Cams
  • Cloth cutters
  • Cold taps
  • Reamers
  • Trimmer dies
  • Tube expander rolls
  • Cutting hobs
  • Strip slitting cutters
  • Knife production
  • Stamping dies
  • Wood-cutting tools
  • Mould-making applications

Chemical Composition

The chemical composition is as follows:

  • Carbon 0.95%
  • Manganese 1.2%
  • Chromium 0.50%
  • Tungsten 0.50%
  • Silicon 0.25%
  • Vanadium 0.20%
  • S & P up to 0.035% maximum


What is ground flat stock?

Ground flat stock is a precision ground flat bar available in fixed lengths. It’s well-known for its accuracy and light tolerances, which is why it’s so often used for toolmaking purposes.  

How hard is ground flat stock?

The annealed condition of ground flat stock means it has a maximum hardness.

How flat is ground flat stock?

Unfortunately, there is no real definitive figure regarding flatness tolerance. Rather, the “flatness” that is described simply means the material isn’t round.

Why are tool steels hard?

The fair wear resistance, toughness, and hardness stem from the high levels of carbide that are created by tool steels. This carbide level comes from the low carbon content and moderate to high alloy.

Shop Imperial Square Ground Flat Stock at Rennie Tool Company

If you’re in need of imperial square ground flat stock, Rennie Tool Company is here to help. Our extensive stock of various lengths allows us to accommodate multiple projects. Be sure to browse our collection below or email us at for further advice and guidance.