Flattening, Straightening and Finishing


Shallow trepanning using plate stock:

  • Aluminum, stainless steel and other alloys
  • Weight reduction in finished parts
  • Pistons or cylinders
  • Fluid ports
  • Seals and more

Shallow Trepanning

When people think about trepanning they typically envision large, deep, round holes or hollowing of bar stock, but at TCI Precision Metals we provide a variation of trepanning, using plate stock, that we call Shallow Trepanning.

At TCI Precision Metals we use our method of shallow trepanning in the production of precision Feature-Added Machine-Ready Blanks, for example, when customer specifications require plate stock with large diameter holes or circle features, machined to close tolerances. Round flat blanks with a through or blind hole, concentric rings, and discs are all considered trepanned parts.

At TCI Precision Metals we trepan aluminum, stainless steel, and other alloys in the process of producing many different types of Machine-Ready Blanks, roughed parts, and finished machined parts, based on an understanding of what the customer is looking to accomplish. Things to consider when talking to us about trepanning, include:

  • What material and heat treatment is required?
  • If the material is being supplied, is it bar stock, forgings or castings?
  • What are the specifications and tolerances for the trepan feature?
  • Are there concentricity requirements?
  • Are there any surface finish requirements?

Your Stock or Ours

TCI Precision Metals is a mill-direct wholesale plate and sheet distributor and can deliver machined parts to your specifications. We also welcome customer supplied material. Provide us with your out-of-flat material, and let us bring it to size. Let TCI flatten or straighten your next job!


All orders include shipping – FOB customer destination

View Shallow Trepanning Parts Photo Gallery

View Our Machine-Ready Services

Rough CNC Milling, Turning

Rough down or hog out large amounts of material, which reduces finish machining time. LEARN MORE

Finish CNC Milling, Turning

Complete-to-print finish machined parts, including sub assembly and managed inventory. LEARN MORE

Duplex Milling

Duplex milling removes material from two sides at the same time, producing dimensionally square parts.  LEARN MORE


Blanchard and Double-Disc grinding provides close tolerance, flat, stress free material with superior finish. LEARN MORE

Flattening, Straightening and Finishing

Hydraulic, mechanical and abrasive flattening, straightening and high quality finishing to 600 grit. LEARN MORE

Precision Sawing

Precision sawing of plate and sheet to within +/-.005” and squareness to within .0005” per linear inch. LEARN MORE

What Our Customers Have to Say

More Customer Testimonials —>

Very happy with product (dimensions and finish), packing and shipping protection – excellent.

— Tooling company (Spring, TX)

Good Parts.

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On Time.

When You Need It


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