Accu-Square™ Pre-machined Squared Material

Accu-Squared™ Pre-Machined MaterialOur CNC machining centers and grinders allow us to process pre-machined squared material. ACCU-SQUARE™ will save valuable labor time and increase productivity. Machined to your exact tolerances, material can be supplied square and parallel while maintaining incredible speed and accuracy. ACCU-SQUARE™ is the future for specialty steel requirements.


  • Close Tolerances
  • Square-Parallel
  • Save valuable labor time
  • Increase productivity

Available Materials:

  • Tool Steel
  • Alloy Steel
  • High-Speed Steel
  • Carbon Steel
  • Powder Metal Products
  • Stainless Steel
Minimum and Maximum Machining Capabilities

Here at Diehl, we pride ourselves on our ability to not only produce results with extreme precision, but to maintain this level of quality with an impressive allowance of sizes. In the table below, one can see both our minimum and maximum working capacities; all dimensions are measured in inches. Please contact us with any questions concerning our machining capacities and allowances.

Area Minimum Length Minimum Width Minimum Thickness Maximum Length Maximum Width Maximum Thickness
Large Saws 40 40
Production Saws 0.25 0.25 0.25 20 18
Plate Saws 0.25 0.25 144 Piece Width – 25 25
Small Duplex 0.787 0.787 0.394 16.93 16.93 5.91
Small Plate Mill 0.200 51.1 31.4 11.8
Large Duplex 4.72 4.72 0.394 39.37 39.37 16
Large Plate Mill 0.25 118.1 59 16


Diehl Express™ Rapid Turnaround Service

Diehl Express rapid turnaroundWith our Diehl Express™ service, you can get your Accu-Square™ tool steel shipped the same day you order it so it’s on your dock when and where you need it.  Simply place your tool steel order by 12:00 PM EST, request our Diehl Express service. We will cut it and square it using our Accu-Square™ process, and ship it to your shop that same day.  The service is designed for up to 10 piece quantities.

By increasing our inventory of popular grades, increasing pre-cut sizes, and dedicating resources to the program, most of our current orders qualify for Diehl Express service. With Diehl Express, we can be a ‘local’ resource to most any customer in the country.

Available for A-2, D-2, and 4140 P.H.T.  Contact us for availability in other grades.

Diehl Tool Steel Precision Saw Cutting

Diehl Tool Steel Offers Precision Saw Cutting of Steel and Other MetalsWith our four in-house, state-of-the-art Vertical Plate Saws and twelve Horizontal Saws, Diehl Tool Steel is able to process orders to exact customer specifications. We process both large and small cutting requirements. Saw cut items ship in 24 to 48 hours.


Diehl Tool Steel Quality Grinding

Diehl Tool Steel Offers Quality Steel Grinding ServicesTo ensure outstanding quality, Diehl Tool Steel has an in-house grinding department. Custom ground on 2, 4, or 6 sides flat, square, and parallel to your specifications. Tolerances as close as +/- .001” on thickness, width, and length. Closer tolerances available upon request. Ground-To-Size items ship promptly to meet your demanding schedule.


Diehl Tool Steel Centerless Grinding and Hollow Bar

Diehl Tool Steel Centerless Grinding and Hollow Bars

Diehl Tool Steel Inc. has always processed custom centerless ground and hollow bar steel products. Non-standard sizes and special tolerances are our specialties. In today’s busy manufacturing environment tool shops and machine shops are routinely challenged with very demanding schedules and lead times. Supplying the customer a more finished product to save them valuable preparation work has become an important aspect of the Diehl Tool Steel total commitment to quality and service. Centerless grinding and hollow bar will gives the competitive edge to meet the most demanding schedules.

The required size will be machined with an oversize tolerance to finish to the specified outside diameter (OD) and machined undersize to finish to the specified inside diameter (ID). Material will also be saw-cut oversize to finish to the customer’s exact length/thickness



Hitachi World-Class Manufacturing and Processing Capabilities


As a subsidiary of Hitachi Metals, Diehl Tool Steel has access to Hitachi’s state of the art hydraulic presses, seen below. These can be scheduled for mill production runs of some of the highest quality steel in the world. Contact us for any questions or inquiries into these specialty services.


10,000mt hydraulic Open Die Forge with twin Manipulator, one of the world’s largest Tool Steel presses

Hitachi’s rotary forge machine capability of making Tool Steel rounds 8 to 18 inch diameter