Trepanning Services
TCI provides 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 material, and let TCI perform trepanning to make discs and rings.


All orders include shipping – FOB customer destination

Trepanning Gallery

View Our Machine-Ready Services

Precision Waterjet Cutting

Fastest cutting speeds available in the industry with inventory on hand for quick turnaround. LEARN MORE

CNC Milling, Turning

Complete-to-print finished machined parts. LEARN MORE

Rough machining, including hog outs. 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 —>

I received my blanks today. These look beautiful. Quality product, excellent customer service, on-time delivery, and exceptional packaging… unheard of these days!! I’m anxious to start using them. Thank you for all your help on this. I’ll definitely order again.

Just want to say thanks. I recently ran a job with some blanks ordered from TCI. The blanks saved me two setups and more importantly put extra profit into my pocket. I don’t usually have the luxury of waiting to get material for a job but this time everything worked out fine. You guys rock!

Anonymous Note from Survey

I receive my material on time or early. I have to say it’s a pleasure not having to keep following up on my product and just knowing it’s going to be here when promised.

Aerospace manufacturer (Corona, CA)

Very pleased with the quality of the product and the price was very competitive even considering the cross country shipping costs.

Precision manufacturer (Philadelphia, PA)

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

Tooling company (Spring, TX)

TCI is my favorite vendor to do business with! Thanks for making my life a little easier.

Medical device manufacturer (Pittsburgh, PA)

All of my suppliers should be as good as TCI! 30 years without a failure!

Custom precision machining and manufacturing plant (Louisville, KY)

We have had an excellent relationship with excellent service for 20 years.

Precision manufacturer (Louisville, KY)

Staff were all professional. Delivered quality parts on time.

Small machine shop (Spring Valley, CA)

Great quality – turned a job from a loser to a winner.

Family-owned business (St. Louis, MO)

Sales people are great to work with!

Precision manufacturer (Tucson, AZ)