Keyway Broaching Services for Precision Internal Slots
At Broaching Technologies, our keyway broaching services are performed using rigid vertical slotting machines that provide precise stroke control and consistent cutting action. This approach allows us to produce accurate internal keyways with reliable depth, width, and surface finish across both prototype broaching and production volumes.
What Is Keyway Broaching?
Keyway broaching machines have a single internal slot inside a bore to seat a mating key. That key transfers torque from a shaft to a hub while holding the two components in proper alignment making it one of the most common and reliable methods for locking rotating parts together in power transmission assemblies.
- Cuts a single internal slot within a bore
- Transfers torque between shaft and hub
- Keeps mating components correctly aligned
- Standard in gears, pulleys, hubs, and couplings
Why Keyway Broaching Requires Precision Equipment
A keyway only works if its width, depth, and straightness are held accurately — that’s what gives the key a proper fit and clean load transfer. When the geometry drifts, even slightly, you get poor alignment, uneven loading, and premature wear on both the key and the mating parts. Consistent results come down to the machine doing the cutting.
- Precise stroke control holds consistent keyway depth
- A rigid machine structure minimizes tool deflection
- Controlled cutting motion sharpens slot accuracy
- Results stay repeatable across production volumes
As the exclusive U.S. distributor of C.A.M.S. slotting machines, Broaching Technologies runs the same equipment we sell so we know firsthand how these machines perform in live production, not just on paper.
Keyway Broaching as a Core Capability
Internal keyway machining work is a core capability here, supporting manufacturers who need dependable keyways for power transmission and mechanical assemblies. From standard single keyways to more specialized profiles, we match the method to the part.
Sunk Key Broaching
Saddle Key Broaching
Saddle keyways machined to seat against the shaft surface and matched to the mating hub, suited to lighter-duty torque applications.
Tangent Key Machining
Round Keyway Cutting
Spline Keyway Broaching
Internal spline and multi-tooth keyway profiles cut with custom broach tooling, for parts that need to spread torque across multiple contact points.
Keyseat Machining
Keyseats cut with fast cycle times for hubs, pulleys, and similar components, keeping turnaround short on production runs.
Tooling and Engineering Expertise for Keyway Broaching
Keyway quality depends heavily on the tool. Broaching Technologies designs, maintains, and reconditions custom broaches to match each keyway size, material, and tolerance band — which is why results stay consistent from job to job. Well-maintained tooling also protects surface finish and extends the life of every cut.
- Custom keyway broaching tool built for specific keyway dimensions
- Progressive cutting geometry for controlled material removal
- Ongoing maintenance and reconditioning to preserve cut quality
- Engineering review of part geometry and tolerances before cutting
Materials We Commonly Broach
We broach a broad range of materials used across mechanical and power transmission components:
- Carbon and alloy steels
- Stainless steels
- Aluminum alloys
- Bronze and brass
- Inconel and other high strength alloys
Rigid machine platforms and controlled metal cutting strategies let us hold tight tolerances and clean surface finishes across all of them including the tougher, work-hardening alloys that resist consistent machining.
Industries That Rely on Keyway Broaching
Reliable torque transmission and precise alignment matter most in demanding sectors, where a poorly fitted keyway can compromise an entire assembly. We support manufacturers across:
Oil and Gas Equipment
Pump & Fluid Handling
Electric Motors & Power Transmission
Agricultural & Construction Equipment
Aerospace & Defense Components
Medical Device Manufacturing
Why Choose Broaching Technologies for Keyway Broaching?
Specialists in Accurate Internal Keyways
- Accurate internal keyways with consistent width, depth, and straightness
- Vertical slotting machines that deliver precise stroke control and clean geometry
- Custom tooling matched to part size and tolerance requirements
- Proven capability across gears, pulleys, hubs, and couplings
- Reliable results for both prototype and repeat production
- Tight fits that support proper load transfer and long service life
- Engineering review to confirm manufacturability and performance
Ready to Get Started with Keyway Broaching?
If your part needs accurate internal keyways with a proper fit and dependable torque transfer, Broaching Technologies delivers precision keyway broaching manufacturing backed by controlled machining and proven process expertise. Send us your drawing and our team will review the geometry, tolerances, and volume to recommend the right approach.