Broaching & Serration is used at Engineering Hardware to make custom nuts, keys, general components to a customer drawing. Pushing or pulling a toothed tool through or across the work, each tooth cutting a little deeper than the last. The minimum order is 2,000–5,000 pieces and samples follow within 7 days of the drawing being approved.
Pushing or pulling a toothed tool through or across the work, each tooth cutting a little deeper than the last.
Broaching produces shapes no rotating tool can: internal squares and hexagons, keyways, splines and serrations, all in one stroke and all to a consistent form. On fasteners it appears as the serration under a flange nut — the ring of teeth that bites the bearing surface and resists loosening — and as internal drives in security and specialty parts. The tool is specific to the form, which is what makes it a volume process.
What Broaching & Serration is the right choice for
- Serrated flange faces
- Internal squares, hexagons and splines
- Keyways and consistent tooth forms
Where it is the wrong choice
- Form-specific tooling, so it needs volume to justify
- Access and stroke length constrain what is possible
Parts produced this way
- Custom Nut — 110 standard parts in the catalog
- Custom Machine Key — 5 standard parts in the catalog
- Custom Machined Component — 11 standard parts in the catalog
Usually combined with
Broaching & Serration is rarely the only operation on a part. On most jobs it sits in a sequence with:
Order terms
- Minimum order
- 2,000–5,000 pieces. The exact figure depends on the part: it is set by the tooling the drawing calls for, and is confirmed when the drawing has been reviewed.
- Samples
- Within 7 days of drawing approval.
- Drawing
- Preferred, but not required — a sample, photographs or a sketch is enough to start.
What a quotation needs
Nine things, and a drawing settles most of them at once. Where a field is unknown, say so — an assumption stated is better than a blank, and several of these can be recommended rather than specified.
- Drawing
- A 2D drawing (PDF or DWG) or a 3D model settles almost every other question on this list at once.
- Dimensions
- Diameter, length, head size and any features — enough to know what is being made.
- Tolerance
- Tolerance is the single biggest cost driver. Tell us which dimensions are critical and which are not — holding everything tight costs money on features nobody measures.
- Material
- Carbon steel, alloy steel, stainless, brass, aluminium, titanium — or the application, and we will suggest one.
- Strength grade
- Property class to ISO 898-1 (8.8, 10.9, 12.9) or stainless class to ISO 3506 (A2-70, A4-80). This decides the material and the heat treatment together.
- Thread standard
- Metric coarse, metric fine, UNC, UNF, BSW or a pipe thread — and the tolerance class if it is specified.
- Surface finish
- Zinc, hot-dip galvanised, black oxide, Dacromet, Geomet, nickel, passivation, or plain. Salt-spray hours if you have a requirement.
- Quantity
- Annual volume and first-order quantity. Volume changes which process is the right one, so it changes the price more than most buyers expect.
- Application & environment
- What the part holds together, and what it has to survive — temperature, vibration, chemicals, salt. This is what lets us catch a specification that will not work before it is made.
Draw it here
No CAD, no account, nothing to install. Draw the part in your browser, generate a real ISO metric thread from M1 to M100 with the end treatment it needs, dimension it, and export a PDF or a DXF to attach below. Sheets run to two metres for long studs and threaded rod.
Questions
What is the minimum order quantity for a custom part?
Between 2,000 and 5,000 pieces for most parts. The exact figure depends on the part: it is set by the tooling the drawing calls for, and is confirmed when the drawing has been reviewed.
How long does a sample take?
Within 7 days once the drawing has been approved. The drawing stage comes first, and for a part being reverse-engineered from a sample it is where most of the time goes.
Can you make a part without a drawing?
Yes. A physical sample, photographs against a scale, or a dimensioned sketch are all workable starting points. A drawing is produced from whichever of those you have and sent back for approval before anything is made.
When is Broaching & Serration not the right process?
Form-specific tooling, so it needs volume to justify. Access and stroke length constrain what is possible.
Which fasteners are made by broaching & serration?
In this catalog: nut, machine key, machined component. Whether it is the right process for a particular part depends on the drawing and the quantity.