Plasma Cutter for Metal: 5 Picks Scored for Shop and Garage (2026)

A plasma cutter for metal uses an electrically ionized gas arc to slice through conductive materials faster and cleaner than an oxy-fuel torch or mechanical saw. This guide compares five options on what each listing publishes: output amperage, clean cut capacity, arc start mechanism, duty cycle, and stated warranty. Whether cutting mild steel, stainless steel, or aluminum in a home garage, matching amperage and air supply to your material thickness is essential.

As an Amazon Associate I earn from qualifying purchases. WeldGearLab earns a commission when you buy through links on this page, at no extra cost to you. Read our affiliate disclosure.

Compare the picks

Model	Gear Score	Output amps	Input voltage	Stated clean cut	Arc start	Duty cycle	Warranty
PRIMEWELD CUT60	7.7/10	60A	110V/220V	Not stated	Blowback pilot arc	60% at 60A	3 years
Reboot RBC6000D	6.8/10	60A at 240V / 35A at 120V	120V/240V	1/2 in at 120V / 5/8 in at 240V	Touch arc	Not stated	1 year
LOTOS LT5000D	6.8/10	10-50A at 240V / 10-35A at 120V	120V or 240V	1/2 in at 240V / 1/3 in at 120V	Not stated	60% at 50A	None stated
DNYKER CUT50	6.2/10	50A	110V/220V	1/3 in at 110V / 2/5 in at 220V	High-frequency pilot arc	Not stated	None stated
RIVERWELD Roller Guide	4.4/10	Not stated	Not stated	Not stated	Stand-off guide for pilot arc	Not stated	None stated

Specifications are manufacturer rated, as published on each listing and collected 9 October 2026.

The picks

How we scored them

Each listing is scored out of 100 on performance, build, value, safety listing and warranty, with the weights published on our How We Pick page. None of the listings publish an electrical safety certification such as UL or CSA, so every model here scores zero on that criterion; the overall ranking reflects the remaining four categories.

Product	Gear Score	Perf. /35	Build /25	Value /25	Safety /10	Warranty /5
PRIMEWELD CUT60	7.7	30	21	21	0	4
Reboot RBC6000D	6.8	27	19	20	0	2
LOTOS LT5000D	6.8	28	21	21	0	0
DNYKER CUT50	6.2	23	19	20	0	0
RIVERWELD Roller Guide	4.4	12	15	18	0	0

Buying guide: how to choose a plasma cutter for metal

Cutting capacity and amperage

Amperage determines the thickness of metal a machine can sever or cleanly cut. A 50A or 60A machine running on a 240V circuit can handle mild steel up to 1/2 inch or 5/8 inch, with severance capacity up to 3/4 inch where stated. On a 120V household circuit, output is lower, typically between 30A and 35A, which reduces clean cutting capacity to 1/3 inch or 1/2 inch. Always compare the clean-cut thickness rather than maximum severance, because clean cuts leave minimal slag and need little edge grinding.

Pilot arc versus touch start

Arc initiation directly affects consumable life and versatility. Non-touch pilot arc torches, like those on the PRIMEWELD CUT60 and DNYKER CUT50, strike the cutting arc inside the torch head without needing direct electrical contact with the workpiece. This allows you to cut directly through rusted, painted, or expanded metal without grinding a clean contact spot first. Touch-start machines, such as the Reboot RBC6000D with its PT31 torch, require physical contact between the nozzle and the metal to initiate the arc.

Input voltage and shop power

Dual-voltage machines offer flexibility between standard household wall outlets and dedicated high-voltage circuits. Operating on 120V allows for mobile repairs, but the machine will draw higher input current and produce lower cutting power. Connecting to a 220V or 240V circuit unlocks the full 50A or 60A output needed for thicker metal fabrication. Check your shop breaker capacity before running at maximum output, as 60A cutting can require a 40A or 50A breaker depending on supply voltage.

Air compressor requirements

Plasma cutters require a steady supply of dry, oil-free compressed air to cool the torch and blow molten metal out of the cut kerf. The listings here specify operating pressures between 60 and 75 PSI, with compressor ratings of 90 PSI at 60 L/min or above. If your compressor cannot maintain continuous volume, air pressure drops, causing arc stutter and ragged cut edges. For portable setups, consider our guide to a plasma cutter with air compressor.

Duty cycle and cooling

Duty cycle specifies the proportion of continuous cutting time a machine can sustain at a specific amperage before thermal overload kicks in. The PRIMEWELD CUT60 and LOTOS LT5000D state a 60% duty cycle at their maximum output (60A and 50A, respectively), which supports serious fabrication runs. Inverter units with unstated duty cycles should be given regular cooling pauses between passes. For more details on calculating run time, see our breakdown on welding duty cycle explained.

Safety precautions

Use as directed. Plasma cutting produces intense optical radiation, high electrical voltage, hot molten dross, and hazardous metal fumes. Always wear proper eye protection with suitable shade filters, flame-resistant leather sleeves or jackets, and welding gloves. Provide adequate ventilation when cutting galvanized metal, stainless steel, or aluminum to prevent inhalation of toxic fumes. Keep air hoses and power cables clear of falling slag, ensure a solid electrical connection with a quality best welding ground clamp, and keep a fire extinguisher nearby. See the OSHA welding overview and our Safety Disclaimer.

Frequently Asked Questions

What is a plasma cutter and how does it work on metal?

A plasma cutter uses a high-velocity jet of ionized gas, known as plasma, to conduct an electrical arc from the torch to the workpiece. The intense thermal energy melts the metal instantly, while the high-pressure compressed air stream blows the molten metal away to produce a clean kerf. It works on any electrically conductive metal, including mild steel, stainless steel, aluminum, copper, and brass.

Does a plasma cutter need an air compressor?

Yes, standard plasma cutting machines require an external supply of clean, dry compressed air. The compressed air both forms the plasma gas and blows molten dross out of the cut channel. Most machines operate with regulated air pressures between 60 and 75 PSI, requiring a shop compressor capable of delivering continuous volume.

Can a plasma cutter cut through painted or rusted metal?

Machines equipped with a non-touch pilot arc can cut directly through painted, rusty, or coated metals without hesitation. The pilot arc establishes the cutting stream before transferring to the base metal, eliminating the need to grind down to bare steel. Contact-start torches require bare metal contact to strike the arc, so painted surfaces may need prep work.

What amperage do I need to cut 1/2 inch steel?

Cutting 1/2 inch steel cleanly generally requires a 50A or 60A plasma cutter running on a 220V or 240V electrical supply. While some 35A machines list 1/2 inch under their maximum limits, cutting speed is slower and the edges will require more cleanup. Running a higher-amperage machine on 240V yields cleaner cut faces with less beveling.

How do I maintain clean cuts and prolong consumable life?

Clean cuts depend on correct air pressure, steady travel speed, and dry air free of moisture and oil. Moisture inside the air line erodes nozzles and electrodes quickly, resulting in wide or angled cut kerfs. Maintain proper torch stand-off distance and replace worn tips according to our advice on Cut 50 plasma cutter tips and plasma cutter consumables.

Related: plasma cutters hub, plasma cutter with air compressor, Cut 50 plasma cutter tips, plasma cutter consumables, metal fabrication tools hub, and our best welding ground clamp.

About the author