Domestic Carbide Tooling for PCB & Semiconductor Manufacturing | CPI

PCB & Semiconductor Manufacturing | May 20, 2026

When Apple and Nvidia Say "Build It in America," Someone Has to Make the Tooling

How CPI's precision carbide machining, EDM, and grinding capabilities serve PCB assemblers and semiconductor equipment manufacturers across the domestic electronics supply chain.

Georgetown, KY  ·  Carbide Products, Inc.

Apple committed $600 billion to U.S. manufacturing over four years. Nvidia announced $500 billion in domestic AI infrastructure. GlobalFoundries pledged $16 billion to expand semiconductor fabrication capacity on American soil. The announcements keep coming, and the supply chain math behind them is starting to land in procurement departments at every level.

Here's what those headlines don't say: a semiconductor fabrication line — or a PCB assembly line, or an in-circuit test station — is not built from silicon and circuit boards alone. It runs on thousands of precision-machined components: fixture bodies, wear parts, alignment features, probe guides, vacuum seal surfaces, and tooling that holds position to sub-thousandth tolerances through millions of cycles. Before a single chip is produced or a single board is assembled, someone has to make the tooling.

That's where CPI fits into this story.

CPI has served precision-demanding industries — aerospace, medical, automotive — for over 80 years. The capabilities that keep those supply chains running translate directly to PCB assembly and semiconductor equipment manufacturing. This is not a new direction for us. It's the same work, applied to a sector that's now actively looking for domestic suppliers who can deliver.

What PCB Manufacturers Actually Need From a Precision Shop

PCB fabrication and assembly require tight-tolerance carbide tooling and custom fixtures at nearly every stage of production. Most of those components are still sourced overseas — a dependency that's getting harder to justify as lead times stretch and supply chain exposure accumulates.

CPI serves PCB manufacturing across several application areas:

• Wave solder pallets and SMT assembly fixtures Every assembly line requires custom fixtures matched to a specific board's geometry. CPI machines these to ±0.0005" — producing precise board-matching pockets and locating features that maintain dimensional accuracy through thousands of thermal cycles. Prototype-to-production capability covers both NPI and volume runs.
• ICT and functional test fixture components In-circuit test fixtures use spring-loaded probe pins that must contact test points with exact repeatability across 100,000+ insertions. The alignment features, guide pins, and hardened bushings that make this work require positional accuracy that conventional machining can't reliably produce. CPI's Wire EDM holds ±0.00012" (3 microns) — the tolerance this application demands.
• Wear components for PCB equipment Depaneling machines, automated pick-and-place systems, and board-handling conveyors all consume wear parts: guide rails, carbide inserts, nozzle tips, and linear guides. CPI forms and grinds carbide wear components to tight flatness and straightness tolerances, with centerless grinding for cylindrical parts and induction brazing to bond carbide tips to steel bodies cost-effectively.

Semiconductor Fab Equipment: Where the Tolerance Requirements Get Serious

Semiconductor fabrication equipment sits at the top of the precision manufacturing stack. Photolithography systems, CVD reactors, CMP polishing equipment, and wafer-handling systems demand components that other shops routinely decline to quote. Wafer chuck bodies, vacuum seal surfaces, flow control parts, and pressure transducer diaphragms require near-mirror surface finishes, sub-micron dimensional accuracy, and material traceability that most machine shops can't provide.

CPI runs toward this work. A few specific capabilities are worth naming:

EDM threading in carbide and ceramics is a specialty that separates shops capable of semiconductor tooling work from those that aren't. When a component requires threaded features in a hardened or ceramic substrate — and conventional thread-forming would fracture the material or disturb the surface — EDM threading is the only practical method. CPI has the equipment and the process knowledge to do this reliably.

Beyond threading, CPI's sinker EDM holds ±0.0001" on complex internal cavities and seal geometries. Precision grinding produces near-mirror finishes on carbide and hardened steel — the surface quality vacuum seal faces and wafer contact surfaces require. The climate-controlled facility supports dimensional stability during tight-tolerance work. And we can provide serialized inspection reports and material lot traceability documentation that meets semiconductor supply chain requirements.

CPI capability matched to semiconductor fab applications:

• Sinker EDM to ±0.0001" Complex internal cavities, vacuum and flow control geometries, seal features that can't be reached by conventional cutting tools.
• Wire EDM to ±0.00012" (3 microns) Precision cavity tooling, intricate profiled features, through-features in hardened materials — at a tolerance that competes with EDM-specialist shops.
• Near-mirror surface finishing on carbide and hardened steel Wafer chuck surfaces, seal faces, and wafer contact components where surface finish directly affects yield.
• In-house heat treating and brazing Carbide-tipped and bonded assemblies for wear-critical components; hardening after machining for components that need wear resistance without dimensional distortion from outsourced heat treating.
• Serialized QC and material lot traceability Every order includues material lot tracability. We can also provide serialized inspection reports that document the dimensional accuracy of each component — a requirement for many semiconductor supply chains.

The Domestic Sourcing Argument for Electronics Tooling

The same procurement calculus driving the Apple and Nvidia announcements applies at the component and tooling level, just with less press coverage. An ICT fixture made in Taiwan carries the same supply chain exposure as any other import-dependent part — extended lead times, customs uncertainty, and traceability documentation that may not satisfy an OEM's audit requirements. A wave solder pallet from an overseas supplier takes 6–14 weeks to arrive. A fixture issue discovered during NPI can't wait that long.

CPI is in Georgetown, KY. That puts us within logistics reach of Ohio, Indiana, Tennessee, and the broader Midwest electronics manufacturing corridor. Our lead times are often a fraction of what you'd get from overseas suppliers. When a fixture wears out or a board revision requires updated tooling geometry, the conversation happens in a time zone that matches yours.

We're also willing to be honest about fit. If a job doesn't match our capabilities, we'll tell you. What we won't do is quote something we can't deliver. That's been our approach for 80 years — it's not changing because the market is moving in our direction.

How to Start the Conversation

If you're sourcing precision components for PCB assembly equipment, semiconductor fab tooling, or test fixture work — and you're evaluating domestic suppliers — the fastest way to understand fit is to send us a print. We'll review it and give you an honest read on whether CPI is the right shop for the job, what process we'd use, and what the timeline looks like.

No minimum quantities. No boilerplate quoting. A real conversation with engineers who've been solving precision machining problems since 1943.

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Have a PCB or Semiconductor Tooling Project?

Send us your print. We'll tell you exactly what we can do and what the lead time looks like — no minimum quantities, no runaround.

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Carbide Punch and Die Tooling: Specifying for Life

Tooling Engineering  ·  Carbide Products, Inc.

Carbide Punch & Die Tooling:
Specifying for Service Life,
Not Just First Cost

Grade selection, geometry, and tolerance discipline are the variables that separate tooling that runs a million cycles from tooling that fails at fifty thousand.

Georgetown, KY  ·  May 13, 2026

Every stamping engineer has a story about tooling that didn't make it. The punch cracked at the corner radius on the third day of production. The die insert chipped on a burr the setup missed. The first-article parts looked perfect, and by ten thousand cycles the feature had drifted outside tolerance. These aren't failures of machining skill — they're usually failures of specification. The wrong material, the wrong geometry, or an inadequate tolerance on a feature that had to hold under real production conditions.

Carbide punch and die tooling is not immune to these failures, but it changes the math significantly. When specified correctly — right grade, right geometry, tolerances that reflect the actual demands of the application — carbide tooling routinely achieves ten to forty times the service life of equivalent tool steel tooling in high-cycle stamping environments. When specified incorrectly, carbide's brittleness makes failures faster and more dramatic than anything tool steel would have produced.

This post covers how to get the specification right.

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Why Carbide in High-Cycle Stamping

Tungsten carbide's advantages in punch and die applications are well established: hardness in the range of 1,400–1,800 HV (compared to roughly 740–900 HV for the best tool steels), exceptional wear resistance, and the ability to hold a sharp cutting edge through far more cycles than any metallic alloy. In high-volume stamping — blanking, piercing, fine blanking, progressive die work — these properties translate directly into longer runs between regrind, fewer die changes, and lower cost per stamped part.

The tradeoff is toughness. Carbide is stiffer and more brittle than tool steel. It does not deflect gracefully under overload — it fractures. This means carbide tooling demands more from the press setup, the die clearance, and the part geometry specification than equivalent tool steel tooling would. The engineering work done before the tool is made determines whether carbide's advantages are realized or its brittleness shows up in production.

A useful framing: in a well-specified carbide punch and die application, the tooling should outlast every other consumable in the die. If you're replacing punches before you're replacing the die block, shims, lifters, or die shoe, the tooling specification is worth revisiting.

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Grade Selection: The Foundation of the Specification

Tungsten carbide tooling is not a single material. Grades vary primarily by cobalt binder content and WC grain size, and these two variables drive a direct tradeoff between hardness and toughness. Understanding where your application sits on this tradeoff is the most consequential decision in the specification process.

Low Cobalt (3–8% Co) — High Hardness Grades

Fine grain, very high hardness (1,600–1,800 HV). Best choice for fine blanking and precision piercing of thin, soft materials where cutting edge retention is the primary requirement. Limited toughness — not appropriate for applications with shock loading, interrupted cuts, or misalignment risk. Chipping and fracture are the failure modes when these grades are used outside their design envelope.

Medium Cobalt (10–15% Co) — General Purpose Grades

The workhorse of carbide punch and die tooling. This range provides the best balance of wear resistance and toughness for most stamping applications: medium-gauge sheet metal, stainless steel blanking, and progressive die work where punches may see some lateral load. Most custom carbide punch and die work is specified in this range.

High Cobalt (16–25% Co) — Tough Grades

Lower hardness but substantially improved impact and fracture resistance. Appropriate for heavy blanking of thick or high-strength material, applications with significant shock loading, or geometries — long slender punches, thin webs — where brittleness failure is a primary concern. Also used in forming applications where the tool needs to absorb deformation energy without fracturing.

CPI works with customers to match grade selection to the documented demands of the application: material thickness, tensile strength, press speed, punch geometry, and expected cycle count. There is no universal right answer, and a grade that performs well in one application will fail in another that looks similar on paper.

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Geometry: Where Most Carbide Punch Failures Begin

Carbide's brittleness concentrates stress at geometric discontinuities. This is not a design flaw to be worked around — it's a physical property to be designed for. The geometry of a carbide punch or die insert must be specified with this in mind.

Corner radii are the most common failure point. Internal corners — any place where two surfaces meet at an angle — are stress concentration sites. In carbide tooling, an internal corner with no specified radius is not just a drafting convention, it's a crack initiation site. Most carbide punch geometries require a minimum corner radius on the print. What that radius should be depends on the cobalt grade, the cross-section geometry, and the load environment — but zero is almost never the right answer, regardless of what the stamped part geometry would otherwise call for.

A key specification question that customers often don't think to ask: what is the corner radius on the punch shank where it transitions to the cutting head? If this transition is a sharp step, it's a fracture site under bending load. A blended radius here — even a small one — significantly improves punch life in applications where the punch sees any lateral force during the cut.

Land and clearance specifications also matter more with carbide than with tool steel. The die clearance — the gap between punch OD and die bore — must be tightly controlled. Insufficient clearance increases lateral loading on the punch during cutting, concentrating bending stress in the shank. Excessive clearance produces a drawn edge rather than a sheared edge, causes the punch to seek the center of the die bore on each stroke (introducing fatigue loading), and degrades part quality. The correct clearance for a given application depends on material thickness, tensile strength, and the type of cut — and it should be specified on the die drawing, not left to the die shop's default practice.

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Tolerancing Carbide Punch and Die Sets

Carbide punch and die tooling is typically ground to close tolerances — surface ground for flatness and thickness, OD ground for punch diameter, and ID ground or wire EDM'd for die aperture. The tolerances achievable in carbide grinding are tight: ±0.0001" on diameter, ±0.0001" on flatness, surface finish below Ra 16 µin as a practical standard.

The question is which dimensions require that precision, and which don't. Over-specifying tolerances on features that don't functionally require them drives cost without improving performance. Under-specifying on features that do matter — punch-to-die clearance, flatness of the seating surface, perpendicularity of the punch OD to the shank face — produces tooling that performs poorly regardless of how well it was manufactured.

Tolerance callouts that are commonly under-specified on carbide punch and die prints:

Perpendicularity of the Cutting Face to the Punch Axis

If this relationship is not called out, each supplier will hold whatever their equipment produces by default. A punch that is slightly out-of-square to its axis produces an uneven cut and applies lateral load at a consistent clocking position every stroke — exactly the fatigue loading pattern that causes early shank fractures.

Flatness of the Die Seating Surface

A die insert that rocks on its seat — even a few tenths — concentrates load at the high point on every stroke. This is a common contributor to edge chipping on carbide die inserts in progressive die applications where the die block sees repeated impact.

Surface Finish on the Cutting OD

Carbide's hardness means surface finish on the cutting OD is a wear and friction specification, not just cosmetic. A poorly finished punch OD increases friction during the cut, adds lateral loading during extraction, and can gall against the die bore in tight-clearance applications. Ra 16 µin or better is the practical standard for carbide punch ODs in stamping applications.

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What CPI Brings to Carbide Punch and Die Work

CPI has been manufacturing precision carbide components to customer print for over 80 years. Our punch and die tooling work is not catalog-based — every component is manufactured to the dimensions, grade, and surface finish specified on the customer's print, with the process experience to flag when a specification is likely to cause problems before the tool is made.

Our process combines CNC grinding, surface grinding, and wire EDM for profiles that require it, with CMM inspection on critical dimensions. We work in the full range of WC-Co grades and can advise on grade selection for customers developing a new application or respecifying existing tooling that's underperforming.

If you're sourcing carbide punch and die tooling for a new program, dealing with premature tool failures in an existing application, or transitioning from tool steel to carbide and want to understand what changes in the specification — send us your print and we'll take a look.

Get a Quote From CPI

Have a Punch or Die Application
That Needs Precision Carbide?

Send us your print and we'll put a quote together. Custom carbide punch and die tooling — to your specification, made in Georgetown, KY.

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EDM Threading, Carbide and Hardened Metals

Carbide Products, Inc. is proud to announce the addition of EDM threading to our long list of capabilities.  EDM threading is the best, most economical and, sometimes, only way of putting a threaded hole in cemented carbide, ceramics, hardened steel or other materials when tight tolerances and precision are required.

We utilize our Charmilles Model HD-20 High Speed Hole Drill to burn a start hole in the material.  Then employing our Erowa electrode holders and management system fabricate tap drill electrodes and threading electrodes.  Threading electrodes are matched to each other and timed to allow for multiple rough and finish die sinking routines on one of our Agie-Charmilles CNC sinker EDM’s.  The resulting precision is extraordinary. 

The advantages of EDM threading over conventional tapping methods include, but are not limited to, the following:

• It will not disturb or distort surfaces adjacent to the tapped hole during the tapping process. (Ideal for thin wall and exotic materials found in medical instruments as well as cemented carbides and ceramic where there is not sufficient material to allow for invar plugs or in the event a threaded feature is added after sintering.)

• Makes repairing a tapped hole in a hardened or carbide tool a breeze.

• Tapping steel after it has been hardened improves the quality of the hole when there is concern with distortion in heat-treating.

• Adding a tapped hole to a hardened tool after a redesign or forgetting to do so in the first place becomes exponentially easier.

• Process does not involve displacing material but burning it which results in ability to hold tighter tolerances and sharper threads.

We are currently threading holes in multiple sizes of solid carbide grinding spindles but have ability to thread very small sizes from 2mm up to a reasonably large size hole.  Your application is our challenge.

Please allow Carbide Products, Inc. to become the source for all of your EDM Threading needs!