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Diehl Tool Steel has been selling quality tool steel for over 85 years

Diehl Tool Steel is an ISO 9001:2008 certified company


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Tool Steel Services

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 flat, square and parallel and processed with incredible speed and accuracy. ACCU-SQUARE™ is the future for specialty steel requirements.


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

Available Materials:

  • Tool Steel
  • Alloy Steel
  • High-Speed Steel
  • Carbon Steel
  • Powder Metal Products
  • Stainless Steel
Diehl Express™ Rapid Turnaround Service

Diehl Express rapid turnaroundWith our new 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, and we will cut it and square it using our Accu-Square™ process, and ship it to your shop that same day at no additional cost.  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.

Emphasis is on A-2, D-2, and 4140 P.H.T.  Other grades are available based on availability.

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. Tolerances as close as +/- .010” can be held for many cutting applications. 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 give that customer the competitive edge to meet the most demanding schedules.

Hollow bar can be produced to the customers exact size specifications. 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


Diehl Tool Steel Ready-Block™ EDM Blanks

Diehl Tool Steel Ready-Block EDM Blanks Save Time and Money

READY-BLOCKs™ are tool steel blocks that have been pre-hardened, squared and ground, so they are shipped ready-to-use for EDM. They are available in many popular tool steel grades including in-stock AISI A-2 and D-2 (RC 58-62). Each block is first precision machined to a specific thickness, width, and length, within +.010”/.020” tolerance. They are then hardened and tempered to a standard hardness. A starter hole is included at the customer’s request.

READY-BLOCK™ allows toolmakers immediately to begin the wire EDM process, eliminating the need to machine and heat treat raw material.


  • Pre Heat-Treated
  • Machined to Toolmaker Tolerance
  • Available in Popular Tool Steel Grades
  • Available With or Without Starter Hole
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