O1 Tool Steel Sheet, Precision Ground, Annealed, 1/2' Thickness, 2' Width, 36' Length

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1.Number of Items:1

2.:As Ground

3.:18 Inches

4.Material Type:Tool Steel


6.:1 inches

7.:1 inches


  • O1 tool steel has better machinability than A2 tool steel, and must be hardened in oil
  • Meets ASTM A681 specifications
  • Ground with high precision to the specified shape and size
  • Standard tolerance

Product Description

The O1 tool steel sheet has been precision ground and polished, meets American Society for Testing and Materials International ASTM A681 specifications, and has a standard tolerance. The O1 tool steel grade has better machinability than A2 tool steel. It must be hardened in oil, which can be done at relatively low temperatures for good dimensional stability. The sheet has been ground to achieve the precise shape and size.

Steel is an iron alloy with carbon and other elements that modify the steel to achieve specific properties. In general, steels with higher carbon content have greater strength, hardness, and wear resistance, while those with lower carbon content have more formability, weldability, and toughness. Carbon steels, which include most AISI-SAE grades in the 1000 range, are classified by their level of carbon content as low (below 0.), medium (0. to 0.6%) and high (0.6% and above). Alloy steels, which include AISI-SAE grades in the 1300 and 4000 ranges and above, incorporate elements such as chromium, molybdenum, and nickel to modify properties like machinability and corrosion resistance. Tool steels, which include most grades with a letter and number grade designation, have high carbide content for wear resistance, high hardness, and the ability to hold a cutting edge. Some tool steels are designed to resist deformation when used in elevated temperatures.

Tensile strength, used to indicate a material’s overall strength, is the peak stress it can withstand before it breaks. Wear resistance indicates the ability to prevent surface damage caused by contact with other surfaces. Toughness describes the material's ability to absorb energy before breaking, while hardness (commonly measured as indentation hardness) describes its resistance to permanent surface deformation. Formability indicates how easily the material can be permanently shaped. Machinability describes how easily it can be cut, shaped, finished, or otherwise machined, while weldability characterizes the ability to be welded.

Pack of Monkeys
August 6, 2017
This is really easy working steel to make a knife and very easy to heat treat.

You can watch tons of YouTube videos to see heat treatments and forge designs. I built a simple two brick forge from bricks I purchased on amazon and the results turned out great.

I would recommend using a belt grinder on this metal instead of a file jig. Using a file just takes a long time. But the results are well worth it.

Both of the knives pictured were built using a file jig and the heat treatments turned out very well.

Also, this steel doesn't seem to take a great polish (or I'm doing it wrong). It get hazy rather quickly.
May 7, 2014
promptly delivered as always, good, tough steel. I purchased this for knife making, (a little thick, but that's my fault =P ) this metal came with a nice(r) finish, ready to be worked on; no rust, dings, dents scratches. This O1 tool steel blank came with tempering/hardening instructions on the package.

I will be ordering my metal from this distributor again~
Michael L. Hauschild
November 4, 2017
Seems to be to spec. Oil steel is easy to harden but a good temper with stock this thin has to be done in a bath of molten lead. I have a lead pot for bullet casting that works very well for this task.
I make custom wood carving knives with this steel and the period they go without sharpening is amazing.
This is the only tool steel I have found that will hold up to the rigors of maintaining an edge and not breaking the points by "prying."
January 18, 2015
I purchased this material to make a simple chef's knife for my kitchen. It arrived exactly to spec with the material properly annealed and easy to work with. I was able to cut out the shape, drill the holes, and do all of the work necessary without any trouble. I hardened it to spec and tempered it and have been using this knife for over a year now. It holds the edge quite well and is not terrible about rust either. I was afraid the high-carbon content would give me problems with rusting. YES, it will rust if you leave it in water or attempt to put it in the dishwasher, but as long as you clean it up at some point after using it, you're not going to get any deep rust on it. Even if you get surface rust forming you should be able to soak it in vinegar for a little while and just brush it right off. I have used O1 tool steel from amazon to make several different knives and have not had any trouble with inconsistent quality or poor durability. The price is also quite good if you mess around with the widths and lengths of steel bar. Sometimes wider sizes are cheaper than narrow sizes so be sure to look around a bit before ordering if you're flexible on exactly what you need. I hope that's helpful.
Justin Wood
July 30, 2015
I use this for making knives, it's easy to heat treat and temper in a regular oven. The only negative thing about the steel is it comes with mill marks so you have to be sure to sand them out when finishing your blades.
Emily Broyles
January 2, 2014
I've used this steel to make several knives now. Machining or blacksmithing this steel is as easy as it gets and heat treating almost couldn't be better. The only problem I've had was some warping during hardening on a 16 inch bowie I made. However all of my smaller pieces turned out fine so as long as you're not planning on making a claymore or greatsword I don't think you have to worry too much about warping. ;) Lastly, be careful on the size selection. I noticed that it is actually cheaper sometimes to get 2 inch wide steel rather than 1-1/2 inch. That seems a little odd so do some careful thinking about what you want and sizes of steel. If you can save money by buying 2 inch and drawing it out on the anvil, go for it.
December 13, 2015
Works great for making knives - it's annealed and easy to work with hand or power tools. It's also very easy to heat treat. I'm on my fifth blade and keep ordering from here because it's cheaper than the knife supply shops for the small quantities I need as a hobbyist.

The 1/8" is pretty heavy duty and more suited for camp/utility working knives rather than very fine work in the kitchen. I made one camp knife and have been thoroughly abusing for weeks with no issues. Just keep it clean and dry after use because it is O1 after all.