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Internal Keyway Machining Services for Precision-Fit Components

Need a precise internal keyway cut in a shaft, gear, or coupling? At Keyseaters.com, we specialize in internal keyway machining services using dedicated vertical keyseaters built for tight-tolerance work.

Whether you’re machining hardened materials or dealing with complex blind bores, our keyseating process delivers repeatable, high-precision results—without the tooling costs of broaching or the limitations of EDM.

Keyway Broaching for Food Augers

Experts in Machining Internal Keyways

Internal keyways present unique challenges: limited access, strict tolerances, and material hardness. Our equipment is purpose-built for this exact task.

  • Keyway widths: 1/8” to 1.5”

  • Bore diameters: Up to 24” OD

  • Depths: Up to 6”

  • Material capabilities:

    • Carbon steels (1018, 1045)

    • Stainless (304, 316, 17-4)

    • Tool steels (A2, D2, H13)

    • Aluminum, bronze, Inconel, titanium

If you’re unsure whether your part is a good fit, send us a drawing—we’ll assess it same-day.

Why Use Keyseating for Internal Keyways?

Compared to traditional machining methods, keyseating offers:

  • Superior accuracy for tight-fitting components

  • Ideal for blind holes and enclosed parts

  • Works well on hardened parts and exotic alloys

  • Minimal setup costs for low-volume or prototype runs

It’s the most effective solution when broaching is too aggressive, and EDM is too slow or expensive.


Conveyor Pulley

Applications We Support

Internal keyways are essential in components where torque transfer and alignment are critical. We routinely machine keyways for:

  • Splined shafts

  • Pump impellers

  • Gears and sprockets

  • Drive couplings

  • Industrial rollers

  • Heavy machinery assemblies

If your part needs reliable internal engagement—our shop is built for it.

Industries We Serve

We provide keyway machining services for:

Aerospace

High-precision keyseating for aerospace parts and components.

Automotive

Machines capable of creating custom keyways for automotive transmission and engine parts.

Construction

Heavy-duty keyseating equipment suitable for demanding environments.

Energy & Utility

Machines for keyway cutting in power generation and utility equipment.

Nationwide Service with Fast Turnarounds

  1. We work with machine shops, OEMs, and production managers across the U.S. offering:

    • Quick quoting (24h turnaround)

    • Rapid turnaround for small runs

    • Blind shipment capability for white-label or contract machining

    • Engineering feedback available on request

Request a Quote for Internal Keyway Machining

Use the form below to upload your drawing or spec sheet. We’ll get back to you with a fast, accurate quote and lead time—typically within 1 business day.


Request a Quote