Waterjet Cutting
Waterjet cutting for steel: tolerances, thickness reach and what a quote needs
Waterjet cutting removes steel with a high-pressure stream of water and abrasive rather than heat, so the part comes off the table with no heat-affected zone and no thermal distortion at the cut edge. That is the trade a buyer is making against laser cutting: waterjet reaches thicker material, but it runs slower and leaves a wider kerf. This page covers what actually decides the outcome — the tolerance a shop will commit to, how thick abrasive waterjet reaches on steel and stainless steel, the kerf and taper it leaves, and what a quote needs. Where the industry publishes no figure, this page says so rather than filling the gap.
Tolerances
| Process | Form | Tolerance | |||
|---|---|---|---|---|---|
| Quoted part tolerance | — | — | ±0.254 mm | Supplier-published | Source: Xometry — Manufacturing Standards: "Edge to edge tolerances is +/- .010" nominal on the top face of the plate/sheet" |
| Quoted part tolerance | — | Up to 50 mm | ±0.25 mm | Supplier-published | Source: Charles Day Steels — published waterjet tolerance table: +-0.25mm on length/width, the SAME figure repeated across every published thickness band from 'up to 1.0mm' through 'Over 25mm to 50mm'; 2D parts only |
| Machine capability (not a quoted part tolerance) | — | — | ±0.1 mm down to ±0.025 mm | Supplier-published | Source: TechniWaterjet — Waterjet Cutting Tolerances: machine capability ±0.004in typical to ±0.001in best-case; a machine specification, not a tolerance quoted on a finished part |
| Machine capability (not a quoted part tolerance) | — | — | ±0.05 mm down to ±0.025 mm | Supplier-published | Source: RapidDirect — Waterjet Cutting Tolerances: typical ±0.002in to optimal ±0.001in machine tolerance |
Indicative figures published by suppliers, not a quotation. Confirm what is achievable for your grade, thickness and quantity with the provider.
Thickness reach
| Material | Process | Thickness | ||
|---|---|---|---|---|
| Stainless steel | Abrasive waterjet | up to 229 mm (9 in) | Supplier-published | Source: TechniWaterjet — How Thick Can A Waterjet Cut: "Waterjet cutters can cut through 9 inches of stainless steel" |
| Carbon steel | Abrasive waterjet | up to 305 mm (12 in) | Supplier-published | Source: TechniWaterjet — Abrasive vs Pure Water Jet Cutting: "abrasive waterjet cutting easily cuts through steel blocks that are 12 inches thick"; consistent with the same publisher's separate page stating hard materials generally reach 25–30 cm, and independently with Xometry's laser-vs-waterjet comparison stating parts 'as thick as 250–300 mm' — three independent figures in the same range, not averaged |
Indicative figures published by suppliers, not a quotation. Confirm what is achievable for your grade, thickness and quantity with the provider.
Kerf width
0.5–0.9 mm per cut
Supplier-published
Source: Xometry (0.5 mm minimum cutting slit for waterjet, laser-vs-waterjet comparison) and Fractory (0.9 mm, published cutting-method kerf comparison table) — two suppliers, two figures, not one averaged value
What drives the price
- Material and thickness
- Steel grade
- Part complexity — how intricate the contour is
- Total volume
- Tolerance requirement
What a quote needs
- A 2D DXF or DWG of the contour
- The material and grade
- The material thickness
- The quantity
- The tolerance you actually need
- Any finishing — deburring or edge treatment
- Delivery address and the date you need it
Traceability and EN 10204 certificates
- 2.1
- 2.2
- 3.1
- 3.2
Standard for steel purchases: 3.1
The certificate belongs to the material, not to the cut. Waterjet cutting does not create an EN 10204 certificate — the real question is whether traceability survives the cut, and how the pieces are marked so that it does.
Standard-defined
Source: EN 10204 defines inspection-document types.
Services
What tolerance can waterjet cutting achieve?
Waterjet cutting tolerance depends on whether the figure is a machine specification or a tolerance a shop actually commits to on a finished part, and no source ties either to a formal dimensional standard the way sawing (DIN ISO 2768-1) or laser cutting (DIN EN ISO 9013) does. Charles Day Steels publishes ±0.25 mm on length and width, the same figure repeated across every thickness band up to 50 mm, for 2D parts. Xometry publishes ±0.010 in (0.254 mm), nominal on the top face of the plate. Machine-capability figures published by TechniWaterjet and RapidDirect run tighter — roughly ±0.001 to ±0.004 in — but that is what the equipment can do, not what a shop quotes on your part. Confirm the achievable tolerance for your grade, thickness and quantity with the provider.
How thick a steel plate can waterjet cutting handle?
Abrasive waterjet — the only waterjet process used on steel — reaches deep into plate. TechniWaterjet publishes 229 mm (9 in) for stainless steel and 305 mm (12 in) for hard materials generally, both figures from the same publisher's own service pages. Xometry independently states parts as thick as 250–300 mm in its own laser-vs-waterjet comparison, the same range from an unrelated source. Practical, cost-effective cutting sits well below the maximum reach in most jobs — ask the provider what is economical for your thickness rather than assuming the ceiling is the sweet spot.
How wide is the waterjet kerf?
Waterjet kerf runs wider than a laser's. Xometry states a 0.5 mm minimum cutting slit for waterjet cutting; Fractory's own cutting-method comparison table states 0.9 mm. Both are shown because they are two different suppliers' figures, not one averaged number — expect the real width on your job to fall in that 0.5–0.9 mm range, and include it when you work out how much material a job consumes.
Does a waterjet cut leave a taper?
A waterjet cut is not perfectly square through the thickness. Charles Day Steels publishes a draft-angle tolerance of ±1° on its own tolerance table, for 2D parts. Separately, the shape of the taper depends on thickness: thin material tends to form a V-shaped taper, narrower at the bottom than the top, while thicker material tends to form a barrel shape, wider in the middle of the cut than at either face. Ask the provider how they control taper for your thickness if the application is taper-sensitive.
Does waterjet cutting leave a heat-affected zone?
Waterjet cutting removes material by mechanical erosion, not heat, so unlike laser or plasma cutting it leaves no heat-affected zone. OMAX describes it directly: since waterjet is a cold cutting method, there are no heat-affected zones. Xometry makes the same point from the buyer's side, stating that waterjet does not generate heat input to the part. The grain structure, hardness and strength of the steel next to the cut stay exactly as they were before cutting, which is why property-sensitive work often specifies waterjet over thermal cutting for this reason alone.
Waterjet or laser cutting — which should I use?
Both are non-contact cutting processes, but the trade-offs run in opposite directions. Waterjet leaves no heat-affected zone at all, where laser leaves a narrow one; waterjet reaches thicker plate — into the 250–300 mm class against laser's practical reach of around 30 mm; and waterjet leaves a wider kerf, roughly 0.5–0.9 mm against laser's roughly 0.15–0.5 mm, a figure that belongs to and is sourced on the laser cutting page. What waterjet gives up is speed: Xometry states laser cutting running at 20–70 inches per minute against roughly 1–20 inches per minute for waterjet, so a job that needs neither waterjet's thickness reach nor its heat-free edge will usually cut faster and cheaper on a laser.
Is all steel waterjet cutting abrasive waterjet?
Yes — every steel figure on this page is an abrasive-waterjet figure. TechniWaterjet is explicit that steel is one of the most common materials cut with abrasive waterjet, and that abrasive waterjet cutting cuts through steel blocks up to 12 inches thick, while pure waterjet — water alone, with no garnet abrasive added — is limited to soft materials such as food, paper, foam, rubber, felt and soft plastics, plus thin metal foils. If you are quoting steel plate or bar, you are quoting abrasive waterjet by definition.
What information do you need for a quote?
Send a 2D file of the contour, the material and grade, the thickness, the quantity, and the tolerance you actually need. Add whether you need any finishing such as deburring, and give the delivery address and the date you need the parts. Those seven things are what turn an enquiry into a firm price rather than a range.
Do I get an EN 10204 3.1 certificate?
EN 10204 defines inspection document types 2.1, 2.2, 3.1 and 3.2, and 3.1 is the usual buyer default in steel procurement. As with sawing and laser cutting, waterjet cutting does not itself create a certificate — the certificate belongs to the material. What matters is whether traceability survives the cut, and how each cut piece is marked so it stays linked to its heat. Ask the provider that directly.
Is there a minimum order quantity?
There is no industry-wide minimum order quantity for waterjet cutting; it varies by provider, the same honest answer contract sawing and laser cutting already give for this question. Some shops will cut a single part, others price small quantities in a way that makes them impractical. Ask as part of your enquiry rather than assuming.
What is the lead time?
No general lead time can be stated honestly for waterjet cutting — it varies by provider, by section, by quantity and by their current load, exactly as it does for sawing and laser cutting. Ask for a committed date with your quote rather than assuming a standard turnaround.
What does waterjet cutting cost?
Waterjet cutting is not priced from a single rate, so any figure quoted here would mislead. It runs slower than laser cutting, which is one reason it typically costs more per part on material both processes can cut; what actually drives the price is material and thickness, steel grade, part complexity, total volume and the tolerance you require. Send the items in the quote checklist and you will get a firm price instead of a range.
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