Precision Broaching Service

Broaching Services from China — Keyways, Splines & Internal Shapes Done Right

Need precise keyways, involute splines, hex holes, or square bores cut into your parts? YiguProto is a China-based manufacturer and supplier with the machines, tooling, and experience to broach your parts to spec — fast, consistent, and at factory-direct prices. Send us a drawing and get a quote within hours.

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ISO 9001 Certified Factory
Quotes in 4–24 Hours
No MOQ — 1 to 100,000+ pcs
NDA & IP Protection
Broaching service at YiguProto China factory - precision keyway and spline machining
Broaching in action at our China factory — precision cuts in a single pass

What is Broaching?

A Fast, Precise Way to Cut Internal and External Profiles

Broaching is a machining process that uses a toothed tool (called a broach) to remove material in one single pass. Each tooth on the broach cuts a little deeper than the one before it. The result: a finished shape — keyway, spline, hex, square, or custom form — with excellent repeatability and tight tolerances.

Unlike milling or shaping, which needs multiple passes and skilled setup, broaching produces the full form in seconds per part. That means lower cost per piece, especially when you need hundreds or thousands of identical parts.

As a professional China broaching manufacturer and factory, we operate both vertical and horizontal broaching machines to handle internal and external broaching jobs of all sizes.

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The Problem

Tired of These Headaches With Your Broaching Supplier?

We hear this every day from buyers who come to us after bad experiences with other vendors.

Inconsistent Quality

One batch has perfect keyways. The next batch has parts that don't fit. No inspection reports. No way to trace what went wrong.

Long, Unreliable Lead Times

You were promised 7 days. Three weeks later, you're still waiting. Your production line sits idle because a single keyway operation is holding everything up.

Hidden Costs and Markups

Trading companies and middlemen mark up broaching work by 30–50%. You pay for layers you don't see, and you still can't talk to the engineer making your parts.

Poor Communication

Emails go unanswered for days. Nobody speaks your language in technical detail. You can't get clear answers about tolerances, materials, or tooling costs.

Limited Capabilities

Your shop can mill simple keyways, but they can't broach involute splines or internal hexes. You end up juggling multiple vendors for one part.

IP and File Security Worries

You send your drawings overseas, and you have no idea who sees them. No NDA, no secure file handling, no protection for your designs.

The good news: All of these problems are solvable. They come from working with suppliers who don't specialize in broaching — or who are not the actual factory. At YiguProto, broaching is one of our core services, done in our own China factory, by our own engineers.

Capabilities

Broaching Capabilities at a Glance

Real, production-ready numbers. No vague promises — just what our machines, tooling, and team can deliver every day.

SpecificationStandard CapabilityPremium / On Request
Broaching TypesInternal keyways, internal splines, hex holes, square holesExternal splines, serrations, custom forms, surface broaching
Keyway Width Range2 mm – 50 mm (standard ANSI/ISO sizes in stock)Down to 1 mm, up to 100 mm+ with custom tooling
Stroke LengthUp to 1,500 mmLonger strokes evaluated per job
Part Diameter (Internal)6 mm – 300 mmLarger diameters reviewed case by case
Dimensional Tolerance±0.02 mm (±0.0008 in)±0.01 mm (±0.0004 in) for critical features
Surface FinishRa 1.6 – 3.2 μm (as broached)Ra 0.8 μm with secondary reaming/grinding
Production Volume1 – 10,000+ pcs per orderHigh-volume runs up to 100,000+ pcs/month
Standard Lead Time5–10 business daysRush service available (2–5 days)
Heat TreatmentCan broach pre-hardened materials up to ~40 HRCPost-broaching hardening, case carburizing, nitriding

What We Broach

Broaching Services We Provide

We cover the full range of broaching work that OEMs, job shops, and product companies need most often.

Keyway Broaching

The most common broaching job. We cut straight keyways into bores of hubs, gears, pulleys, sprockets, and couplings. Standard ANSI and metric keyway widths in stock — no custom tooling charge for most standard sizes. Single or multiple keyways per part.

Straight keyways Woodruff keyways Offset keyways

Spline Broaching

We broach involute splines and straight-sided splines for power transmission parts: shafts, hubs, gear blanks, and clutch components. We work to ANSI B92.1, DIN 5480, ISO 14, JIS, and custom standards. Spline data reviewed by our engineers before every run.

Involute splines Straight-sided splines Serrations

Internal Shape Broaching

Hex holes, square holes, double-D bores, torx shapes, and other non-circular internal profiles. These shapes are difficult or expensive to mill — broaching produces them in seconds per part with perfect consistency from first piece to last.

Hex / hexagon bores Square bores Double-D / D-shaped Custom internal forms

Surface / External Broaching

For flat surfaces, slots, notches, and external gear teeth on the outside of a part. Surface broaching is fast and repeatable for high-volume jobs such as connecting rods, brackets, and firearm components.

Flat surfaces External slots/notches External gear teeth

Materials

Materials We Broach

We broach most common engineering metals. If you don't see your material listed, just ask — we can likely run it.

Carbon & Alloy Steel

1018, 1045, 4140, 4340, 8620, A36, and more. Our most commonly broached materials.

Stainless Steel

303, 304, 316, 416, 17-4 PH, 440C. Free-machining grades preferred, but we handle all.

Brass & Bronze

C360 brass, leaded brass, phosphor bronze, aluminum bronze. Excellent broachability, fast cycle times.

Aluminum Alloys

6061, 7075, 2024, 5052. Lightweight, easy to broach, ideal for aerospace and automotive parts.

Tool Steel

D2, A2, O1, H13, S7. Annealed condition recommended. Pre-hardened up to ~45 HRC possible.

Copper & Nickel Alloys

Pure copper, beryllium copper, Inconel, Monel, Hastelloy for specialized applications.

Titanium

Ti-6Al-4V (Grade 5), commercially pure titanium. Sharp tooling and proper coolant required — we have the experience.

Cast Iron & Ductile Iron

Gray cast iron, ductile iron, malleable iron. Common in automotive and heavy industry applications.

Why choose YiguProto as your China broaching supplier
Our in-house broaching department — vertical and horizontal machines

Why YiguProto

Why OEMs Choose Us as Their China Broaching Supplier

We are not a trading company. We are the actual factory. When you work with YiguProto, you get:

Factory-direct pricing — no middleman markupOur China broaching factory cuts out trading companies and agents. You deal directly with the people making your parts and pay real factory prices.
One-stop shop — broaching plus all secondary operationsWe combine broaching with CNC turning, milling, drilling, grinding, heat treatment, and surface finishing in one facility. You get finished parts, not half-finished pieces.
In-house tooling design and buildFor custom profiles, we design and make our own broach tools in our tool room. That means faster turnaround on custom jobs and lower tooling costs than shops that outsource tooling.
English-speaking engineers, not just salespeopleYour quote is reviewed by a real manufacturing engineer who understands broaching. Ask a technical question — you get a technical answer, usually within hours.
Free DFM feedback on every quoteWe don't just take your drawing and run it. Our engineers review your part for broachability and suggest design changes that can reduce cost or improve quality — at no extra charge.
ISO 9001 quality system with inspection reportsEvery batch comes with dimensional inspection reports on request. CMM inspection, material certs, and PPAP documentation available for automotive and aerospace customers.
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15+
Years in precision machining
50+
Countries served worldwide
4–24h
Average quote turnaround
99.2%
On-time delivery rate
±0.01mm
Tightest tolerance held

Industries

Industries We Serve With Our Broaching Service

From medical devices to heavy equipment, broached parts show up everywhere. Here are the sectors we work with most.

Automotive & EV Aerospace & Defense Medical Devices Oil & Gas Agricultural Equipment Industrial Machinery Power Transmission Hydraulics & Pneumatics Firearms & Defense Robotics & Automation Motorsports Construction Equipment

Automotive & EV

Transmission gears, input/output shafts, steering components, parking pawls, CV joint parts. We support IATF 16949-aligned quality systems for production runs.

Medical Devices

Surgical instruments, orthopedic implants, dental tools. Material traceability, passivation, and cleanroom-compatible processing available.

Power Transmission

Gears, splined shafts, couplings, sprockets, pulleys, clutch hubs. Internal and external splines to ANSI, DIN, and ISO standards.

Why Broaching?

Broaching vs. Milling, Shaping, and Wire EDM

Wondering if broaching is the right process for your part? Here is a quick comparison of how broaching stacks up against other ways to cut internal shapes.

FactorBroachingCNC MillingShaping / SlottingWire EDM
Cycle time per partSeconds — one passMinutes — multiple passesSlow — many strokesMinutes to hours
Repeatability (volume)ExcellentGood (tool wear)FairGood (slow)
Surface finishGood (Ra 1.6+)GoodFairExcellent
Cost per part (high volume)LowestMediumHighHighest
Tooling cost (custom shapes)Higher upfrontLowLowNone (uses wire)
Best for100+ identical partsPrototypes, low volumeLow volume, repairsHard materials, low volume, fine detail
Internal splines/hexesIdealPossible but slowPossible but slowRequires start hole
Rule of thumb: If you need more than about 50–100 parts with the same internal shape (keyway, spline, hex), broaching almost always wins on cost and consistency. For prototypes or very hard materials (>45 HRC), wire EDM may be better. Send us your drawing — we'll recommend the best process even if it is not broaching.

How It Works

From Drawing to Delivered Parts in 5 Simple Steps

A clear, transparent process designed for buyers who want answers fast and parts delivered on time.

1

Send Us Your Drawing

Upload a STEP, STP, IGES, DWG, DXF, or PDF file through our quote form. Tell us quantity, material, and finish. Add any notes about critical features.

2

Get a Detailed Quote

Our engineers review your part for broachability. You receive a clear, itemized quote within 4–24 hours on business days — including tooling costs (if any), lead time, and DFM feedback.

3

Approve & Pay

Review the quote, ask questions, request changes if needed. Approve the order and arrange payment. We accept T/T, PayPal, and trade assurance.

4

We Manufacture & Inspect

Your parts are broached in our China factory. In-process checks and final inspection ensure every part meets spec. Material certs and inspection reports provided on request.

5

Ship Worldwide

Parts are packed securely and shipped via DHL, FedEx, UPS, or air/sea freight — your choice. Tracking provided. Typical delivery to North America/Europe: 3–7 days express.

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FAQ

Frequently Asked Questions About Our Broaching Service

Answers to the questions buyers ask us most often. Don't see yours? Contact us directly.

Broaching is used to cut precise internal or external shapes that would be slow or difficult to make by milling or other methods. The most common broached features are keyways (for locking hubs onto shafts), splines (for power transmission), and hex/square holes (for socket-head caps, fasteners, and drive features). Broaching is ideal when you need many identical parts with the same shape.
It depends. For standard keyway sizes and common spline standards, we usually have existing broach tools in stock — no tooling charge. For custom profiles, non-standard splines, or special shapes, a one-time tooling cost will apply. We always list this clearly in your quote up front so there are no surprises. Tooling belongs to you after it is paid for, and we store it for future orders at no extra cost.
Our standard broaching tolerance is ±0.02 mm (±0.0008 inch) on dimensional features. For critical keyways and splines where tighter fit is required, we can hold ±0.01 mm (±0.0004 inch). We recommend you note any critical tolerances on your drawing so our engineers can plan the right tooling and inspection approach.
Internal broaching cuts shapes inside a hole or bore — think keyways, splines, and hex holes in hubs and gears. The broach is pulled or pushed through an existing hole in the workpiece. External (or surface) broaching cuts shapes on the outside of a part — flat surfaces, slots, notches, or external gear teeth. We offer both types at our factory.
There is no strict MOQ. We accept prototype orders as low as 1 piece, and we also run high-volume production orders of tens of thousands of parts per month. For very small quantities (1–10 pcs) requiring custom broach tooling, the tooling cost may dominate the part price — we will tell you this in the quote and suggest alternatives like wire EDM or milling if that gives you better value.
Standard lead time is 5–10 business days, depending on quantity, material availability, and secondary operations (heat treatment, plating, etc.). Rush service is available on request — we have delivered simple keyway parts in as little as 2–3 days. We will always give you a realistic lead time in your quote, and we communicate proactively if anything changes.
Broaching is most efficient on materials up to about 40–45 HRC. If your parts are already hardened beyond that, broaching will cause rapid tool wear and poor finish. In those cases, we recommend broaching before heat treatment, then using grinding or wire EDM for final sizing. If your parts must be hard-broached, let us know — we can evaluate it on a case-by-case basis, or suggest a better process.
We are the actual factory. Dongguan Yigu Technology Co., Ltd. (YiguProto) operates our own manufacturing facility in Dongguan, Guangdong, China. Broaching, CNC machining, and finishing are all done in-house under one roof. You are welcome to visit our factory or do a video tour — just ask your account manager to arrange it.
Yes. We provide CoC (Certificate of Conformance) with every shipment on request. Dimensional inspection reports (from CMM or other calibrated equipment), material certificates (mill test reports per EN 10204 3.1), and PPAP documentation are available at additional cost or included depending on order size. Let us know your documentation needs at the quote stage.
Absolutely. We take IP protection seriously. We are happy to sign your NDA before you share drawings, or we can provide our mutual NDA template. All customer files are stored securely and only accessed by engineers directly working on your project.

Ready to Get Your Broaching Quote?

Send us your drawing today. Our engineers will review your part and send a detailed, factory-direct quote — usually within hours. No obligation. No hidden fees. Just a clear price, lead time, and honest DFM feedback from a real China broaching manufacturer.

Quote in 4–24 hours
Free DFM review
Factory-direct pricing
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