Laser Cutting Thickness: Ranges by Material and Power
Laser cutting can handle thin sheet and, on suitable industrial systems, metal several tens of millimeters thick. The usable range depends on the material, laser source, machine configuration and required edge quality. Use the manufacturer-specific figures below to screen a job, then confirm the actual part. A maximum thickness alone does not prove a production-ready cut.
How thick can a fiber laser cut common metals?
The table uses TRUMPF’s published maximum sheet thicknesses for its TruLaser 1030, 1040 and 1060 fiber series. These are examples from a named machine family, not universal limits for all fiber lasers.
All thicknesses are in millimeters. On small screens, scroll the table sideways.
| Material | 4 kW TruFiber 4000 | 6 kW TruFiber 6001 | 12 kW TruFiber 12001 | 12 kW with thick-sheet package |
|---|---|---|---|---|
| Mild steel | 22 mm | 25 mm | 30 mm | 40 mm |
| Stainless steel | 20 mm | 25 mm | 40 mm | 50 mm |
| Aluminum | 20 mm | 25 mm | 30 mm | Not separately listed |
| Copper | 8 mm | 10 mm | 12.7 mm | Not separately listed |
| Brass | 8 mm | 10 mm | 12.7 mm | Not separately listed |
Source: TRUMPF technical data. The first three columns exclude separately listed thick-sheet options. The summary does not state alloy grade, gas recipe, cutting speed or an agreed edge-quality limit. Confirm the exact configuration and regional specification.
Can a laser cut metal thicker than 50 mm?
Some systems can. TRUMPF lists a maximum of 2.4 inches, about 61 mm, for mild steel and stainless steel on selected 24 kW TruLaser 5000 fiber configurations with the thick-sheet package. That is a specific manufacturer claim, not a guarantee that any 24 kW machine will deliver the same result. It also does not establish an economical production speed. See the 24 kW specification.
What does “maximum cutting thickness” actually mean?
Before comparing quotations, ask what the supplier measured. Separating a plate is not the same as making a part that meets its drawing. A test also needs to explain whether the laser pierces the plate or starts from an exposed edge.
- Cut-through capability
- The material separates. This alone says little about taper, roughness, holes, heat damage or the time spent removing attached metal.
- Acceptable part quality
- The finished part meets agreed requirements for dimensions and edges. The limit can change when the drawing requires small holes, square edges or little finishing.
- Production capacity
- The process repeats that quality at a useful complete cycle time and cost. Include piercing, handling, gas, finishing and rejected parts—not only the time the head is moving.
A useful supplier statement includes all three. For example, a purchase specification can identify the material grade, measured thickness, part drawing, cut-edge requirements, allowed finishing and target cycle time. The supplier then demonstrates that combination instead of showing an unrelated straight cut.
State thickness in millimeters or inches, not just “gauge.” Gauge conventions differ by material. Use the metal gauge-to-thickness chart for conversion, then check the stock itself.
How thick can a CO₂ laser cut acrylic and wood?
Desktop and production CO₂ systems for nonmetals need their own material guidance. Do not use the metal table above for acrylic or wood, and do not assume that equal wattage means equal cutting performance across laser types.
Acrylic: compare the number of passes as well as power
Epilog’s acrylic guide gives these single-pass examples for its systems. Material type and setup still affect the result.
Scroll sideways to see all columns on a small screen.
| Laser power | Acrylic thickness | Pass count |
|---|---|---|
| 80–100 W | 3/8 in · approximately 9.5 mm | One pass |
| 120 W | 1/2 in · 12.7 mm | One pass |
| 200 W | 3/4 in · approximately 19 mm | One pass |
Source: Epilog’s acrylic cutting guide. Its thicker two-pass examples are not interchangeable with these single-pass figures. Check edge appearance, dimensions and total cycle time on your acrylic.
Wood and plywood: test the exact sheet construction
“Wood” is not one consistent material. Species, density, moisture, glue layers and voids can change how a sheet cuts. A setting that separates one plywood panel can leave charred edges or uncut patches in another panel of the same nominal thickness.
Ask the machine supplier for settings for the actual wood product, then run a small representative part. Check the underside for incomplete cuts, the edge for unacceptable charring, and the finished dimensions. Repeated passes are only useful when the resulting part is still acceptable; they are not a universal way to extend a machine’s range.
Do not apply an acrylic chart to an unidentified plastic. PVC and some halogenated or resin-based materials are unsuitable for routine laser processing. Identify the material and coating, obtain the machine maker’s approval and review the extraction requirements before cutting. Trotec lists materials that should not be processed on its laser systems.
Why do material and machine configuration change the thickness limit?
A laser must put enough energy into the cut, while the assist gas clears material from the narrow slot, called the kerf. If energy delivery or material removal becomes unstable, the cut can become rough or stop separating the plate.
Material absorption, heat flow, beam focus, gas and travel speed all affect that balance. This is why a material name plus a wattage is not a complete cutting specification. TRUMPF explains these cutting mechanisms and process variables.
Steel and stainless steel need different edge decisions
Mild steel may be cut with an oxygen-assisted process, while stainless work often calls for an edge with little oxidation. The preferred gas and edge requirement can change the useful thickness and speed.
State the alloy grade and downstream operation. An edge suitable for a rough bracket may not be ready for visible fabrication, coating or a tightly controlled weld joint.
Aluminum, copper and brass need approved material settings
These materials can behave differently from steel in how they absorb and spread heat. Do not transfer a steel limit or an aluminum setting directly to copper or brass.
Confirm that the source, cutting head and process are approved for the exact material. A successful straight cut still needs follow-up checks on piercing and small features.
Does more laser power always mean a thicker cut?
More optical power can create useful cutting capacity, but it does not improve every part in the same way. Beam delivery, the cutting head, nozzle, gas supply, controls and installed options still matter. A thickness chart cannot establish how fast the machine cuts your geometry.
For procurement, compare the exact system configuration and a representative cut test. Keep rated optical laser power separate from the facility’s electrical demand; the chiller, extraction and other equipment also need power.
How do oxygen, nitrogen and air affect the cut edge?
The assist gas is part of the process, not an interchangeable accessory. Compare the gas route used for the quoted thickness with the route required for the finished part.
Oxygen assists cutting but can leave an oxide layer
Oxygen reacts with hot steel and adds heat to the cut. This can help with thickness or speed, but an oxidized edge may need cleaning before the next operation.
Nitrogen controls oxidation without adding reaction heat
Nitrogen ejects molten material without the oxygen reaction. It is often used when edge oxidation is undesirable. The machine must still supply enough energy and gas flow for the cut. A nitrogen-cut edge is not automatically burr-free or ready for every welding process.
Compressed air is not an inert substitute
Air contains oxygen, so its edge result can differ from nitrogen cutting. If an air-cutting quotation looks attractive, compare the finished part and any added edge preparation—not gas price alone.
Process background: TWI’s explanation of reactive and inert assist gases. Use the current machine manual for approved settings; the older article’s example parameters are not a modern machine setup sheet.
How can you verify a cutting thickness for production?
Use a drawing and material that represent the job. A long, open cut is useful evidence of separation, but it does not demonstrate every hole, corner and edge on a finished component.
- Measure and identify the stock. Record alloy grade, nominal and measured thickness, surface finish, coating and flatness. Check more than one point where stock variation matters. The sheet-metal thickness tolerance guide explains why nominal thickness is not the whole specification.
- Put the difficult features in the test. Include representative holes, narrow slots, corners, lead-ins and pierces. Agree whether any features may be drilled or machined afterward.
- Define a passing part before the run. Set dimensional, edge and finishing requirements. Keep representative accepted and rejected edge samples or clear photographs when they help operators make consistent checks.
- Record the actual process and complete time. Note machine, source power, installed options, gas, nozzle, focus setup and program. Measure a full part or nest cycle, including piercing, and record gas use and finishing time.
- Repeat and check the next operation. Inspect several parts under the intended workload. If the parts will be bent, welded, coated or sealed, confirm that they work in that next operation too.
What should you measure on the cut part?
Measure critical dimensions with instruments suitable for the drawing tolerance. Check edge squareness through the thickness, roughness where specified, and dross—solidified material attached to the underside. Inspect pierce locations and small contours separately from long straight edges.
ISO 9013 provides a framework for geometrical thermal-cut quality. Specify the applicable edition, amendment and thickness scope rather than writing only “ISO quality.” Agree any requirements outside that scope separately. Edge chemistry, heat effects and suitability for a later weld need their own acceptance criteria.
If edge heating affects the component’s function, the heat-affected-zone guide explains the issue in more detail. A smooth-looking edge alone does not prove that the material beneath it is unchanged.
Do not accept a thickness claim when the test skips the feature that fails. If the supplier changes the grade, removes small holes, allows more finishing or slows the job beyond your cycle target, reassess the original requirement before approving the process.
Keep the test inside the intended safety setup
Run only approved materials with the machine’s intended enclosure, interlocks, extraction and fire controls in place. Material coatings and residues can change the fumes produced. Gas supply, oxygen enrichment or displacement, hot parts and maintenance tasks also need a site-specific assessment. See the OSHA laser safety guidance and our explanation of laser cutting radiation and related hazards.
Why is the laser failing to cut cleanly at the rated thickness?
A listed maximum is not a recipe for every sheet and contour. Start by comparing the failed run with the approved process sheet. Several different faults can produce a similar edge, so use these symptoms to organize checks, not to diagnose a single cause from appearance.
Scroll sideways on a small screen to read the suggested checks.
| Observed problem | Possible mismatch | What to check next |
|---|---|---|
| Uncut bridges or incomplete separation | Stock, surface, focus, gas delivery or recipe differs from the qualified setup. | Confirm actual thickness and grade, then compare the run record with the machine maker’s approved settings. |
| Heavy dross along the underside | Melt removal is not stable; nozzle condition, gas delivery, speed or focus may contribute. | Inspect the underside and record where the defect starts. Have a trained operator check consumables and delivery conditions using the manual. |
| Straight edges pass, holes or corners fail | The demonstration did not represent piercing, tight contours or local heat buildup. | Test the actual feature and program. Confirm the manufacturer’s minimum-feature guidance for this material and thickness. |
| Parts separate but do not fit or finish well | Edge taper, dimensions, roughness or allowed finishing was not defined. | Measure the part against the drawing and agree the edge requirement before changing the nominal thickness limit. |
Stop for alarms, suspected optical damage, fire or failed extraction. Do not bypass interlocks or perform optical maintenance outside the manufacturer’s authorized procedure.
When should you consider a different cutting process?
If the laser only meets the requirement after slow cutting, repeated passes or extensive finishing, compare another route on the same drawing. The best process is the one that delivers an acceptable part at the required cost and throughput.
- Plasma: worth comparing for conductive metal when the drawing allows its edge and feature characteristics. Include any later machining or finishing.
- Oxy-fuel: an established candidate for thick carbon steel. It is not a general substitute for cutting stainless steel or aluminum.
- Abrasive waterjet: consider it when avoiding a thermal cut edge is important. Still check taper, dimensions, surface condition and cycle time.
- Sawing, routing or machining: useful when the geometry, material approval or final tolerances favor a mechanical process.
Compare cost per acceptable finished part, including consumables, handling, finishing and scrap. The cutting price alone can hide work that simply moves to the next station.
How do you choose a practical laser cutting thickness?
Start with the supplier’s material-specific capability, then ask for evidence that matches your drawing. Keep the material grade, measured thickness, laser configuration, gas route, edge requirements and full cycle time together. Approve the combination that meets the job—not the largest number on the brochure.
Will the cut parts be laser welded next?
Cut-edge condition and fit-up influence the welding process. For a laser-welding application review with Oceanplayer Laser, send the material grade, thickness, joint drawing, cutting method and gas, edge photos, expected quantity and weld requirements.
That information helps connect the cutting result to the next production step. You can also start with the laser welding guide.
Sources and specification notes
- TRUMPF TruLaser 1000 fiber series and 24 kW technical data: named-machine maximum thicknesses and optional configurations.
- Epilog acrylic application guide: acrylic examples with stated pass counts.
- TRUMPF cutting fundamentals and TWI process variants: cutting mechanisms, assist gases and edge terminology.
- ISO 9013:2017 and Amendment 1:2024: geometrical thermal-cut classification and tolerance framework.
- Trotec material restrictions and OSHA laser guidance: material suitability and laser-process hazards.
Manufacturer figures describe the cited systems, not every machine of the same power. Confirm the current specification and test conditions before making a purchase or committing to a production rate.