The Lincoln Electric 20 Plasma Cutter (K2820-1) is Lincoln Electric's entry-level portable plasma cutting system, purpose-built for tradespeople, HVAC contractors, auto body technicians, farm and ranch operators, and homeowners who need a fast, clean, and affordable way to cut steel, stainless steel, aluminum, and other conductive metals up to 1/4 inch. According to Lincoln Electric's product page, the P20 delivers 10–20 amps of output from a standard 115V outlet, making it the only tool in your shop that can cut sheet metal, expanded metal, tubing, and body panels without needing a 240V circuit.
At just 21 pounds, the K2820-1 is genuinely portable — no dolly, no heavy power cable, no separate gas cylinder. It runs on clean compressed air (3.5 CFM @ 65 PSI) from any shop compressor and connects to a standard 120V, 15 or 20 amp outlet. The inverter-based design produces a stable, focused arc that cuts with minimal heat distortion, which is exactly what you need on thin sheet metal where distortion from a grinder or torch ruins the panel.
The non-high-frequency arc start design protects sensitive electronic equipment in vehicles and modern shop environments. Many newer vehicles and CNC machines include electronics that can be damaged by HF plasma — the Lincoln 20's contact-lift start sidesteps that problem entirely. For HVAC work, the 9.5-ft torch reach gives enough cable to work comfortably from an extension ladder without repositioning the power source.
With a 40–50% duty cycle depending on amperage setting, the Lincoln 20 handles continuous sheet metal cutting tasks in realistic production runs. The included saddle hooks keep torch and ground cables organized during storage and transport — a small detail that reflects Lincoln Electric's attention to real-world shop use.
| SKU / Model | K2820-1 / Lincoln 20 (P20) |
| Process | Plasma Cutting (PAC) |
| Input Voltage | 115V, Single-Phase, 50/60 Hz |
| Input Current | 15A branch: 15 A | 20A branch: 26 A (at rated output) |
| Output Range | 10–20 A |
| Rated Output | 115V/15A: 20 A @ 50% | 115V/20A: 20 A @ 40% |
| Recommended Cut Capacity | 1/8 in. (3 mm) mild steel |
| Maximum Cut Capacity | 1/4 in. (6 mm) mild steel |
| Arc Start | Non-High-Frequency (contact/lift) — safe for vehicles and electronics |
| Air Requirement | 3.5 CFM @ 65 PSI (compressed air — standard shop compressor) |
| Air Regulator | Built-in, top-mounted for easy adjustment |
| Torch Cable Length | 9.5 ft |
| Ground Cable Length | 8 ft |
| Plug Type | 5-15P (15A) / 5-20P (20A) |
| Net Weight | 21 lbs (9.5 kg) |
| Dimensions (H×W×D) | 12.5" × 6.5" × 16" (318 × 165 × 406 mm) |
| Warranty | 1 Year (unit) / 90 Days (torch/cable) — Lincoln Electric factory |
| Condition | New — Lincoln Electric K-prefix (factory-new) |
- Lincoln 20 Plasma Cutter Power Source (K2820-1)
- Handheld Cutting Torch Assembly — 9.5 ft reach
- Work Cable & Ground Clamp — 8 ft
- Power Cord & Plug (5-15P standard household plug)
- Saddle hooks for cable storage
- Operator's manual
Expand your Lincoln 20's utility with these WeldingMart-stocked accessories:
- Plasma Torches & Replacement Torch Bodies — LC20 series replacement torches and torch heads; extended-reach torch bodies for deep-reach cutting on pipe, tube, and box sections; flexible-neck heads for angled cuts without repositioning.
- Plasma Consumables — OEM-spec electrodes, nozzles, swirl rings, and shield cups for the Lincoln 20 / LC20 torch; extended-life consumable packs for HVAC sheet metal production runs; drag shield tips for guided straight-line and freehand cuts.
- Air Regulators & Filters — Inline moisture separators and particulate filters to protect the torch consumables from compressor moisture and oil — critical for consistent pilot arc starting and maximum consumable life on any plasma cutter.
The Lincoln 20's 115V input and lightweight, non-HF design make it the right tool for a wide range of hands-on cutting tasks:
- HVAC ductwork and sheet metal fabrication. Cuts 22-gauge to 14-gauge galvanized steel duct sections, register boxes, and sheet metal blanks faster and cleaner than aviation snips or nibblers. The non-HF arc start is safe around HVAC control boards and thermostats. At 9.5 ft of torch reach, one outlet position covers an entire 4×8 sheet on a workbench without moving the power source.
- Automotive bodywork and restoration. Removes rusted floor pans, quarter panels, and rocker sections cleanly without the heat buildup of a saw or grinder that warps surrounding metal. Cuts body sheet metal at 10–15 amps with minimal distortion — important for thin 20-gauge or 22-gauge auto body steel. The non-HF start protects onboard vehicle electronics when cutting on the car.
- Structural steel and farm/ranch repair. Cuts angle iron, flat bar, and square tube up to 1/4 in. thick for fence repair, equipment brackets, and gate fabrication. Runs off the 115V outlet in any shop, barn, or garage without a 240V circuit — the most common limitation on farms and small shops.
- Art, custom fabrication, and metalwork. Artists and custom fabricators use the Lincoln 20 to cut sheet steel patterns, sculpture panels, and custom brackets from flat stock. Lightweight enough to carry to off-site installations and light enough for tabletop use in small studios without a dedicated cutting table.
- Demolition, scrap prep, and MRO. Cuts bolts, rebar, expanded metal, and painted or rusty steel — the pilot arc starts on dirty surfaces without grinding clean. Maintenance crews keep the Lincoln 20 on service trucks for cutting out damaged components, conduit, and structural steel in the field using a portable compressor.
The Lincoln 20 (K2820-1) is rated for a recommended cutting capacity of 1/8 in. (3 mm) mild steel — this is the thickness at which the machine produces clean, production-quality cuts at normal travel speed. The maximum cutting capacity is 1/4 in. (6 mm), achieved with slower travel speed. For consistent results on material thicker than 1/8 in., plan for slower cutting speed and more frequent consumable replacement. The machine also cuts stainless steel, aluminum, and expanded metal at comparable thicknesses.
The duty cycle depends on the input circuit: on a 115V/15A branch circuit, the Lincoln 20 runs at 50% duty cycle at rated output (20 A) — meaning 5 minutes of cutting per 10-minute cycle. On a 115V/20A branch circuit with the 5-20P plug, the machine runs at 40% duty cycle at maximum output. For most HVAC and auto body cutting tasks where cut-and-reposition work is typical, these duty cycles are more than sufficient for continuous operation throughout a workday.
The Lincoln 20 uses a non-high-frequency contact start rather than a blown pilot arc like larger plasma systems. This means the arc must touch the work surface to initiate — it is not a true pilot arc system. For expanded metal, start the cut on a solid section of the mesh, then move across the openings; the arc will maintain once the cut is moving. For painted or lightly rusted steel, grind a small start point clean or start from an edge where the arc can make solid contact. The non-HF design is a deliberate tradeoff that protects nearby electronics.
No. The Lincoln 20 (K2820-1) is a handheld plasma cutter designed for manual freehand and guided cutting only. It does not have a CNC interface port (divided arc signal, machine torch connector, or THC voltage output) required for CNC table integration. For CNC plasma cutting, Lincoln Electric's FlexCut 80 (K4809-1) and larger FlexCut systems support mechanized and CNC table configurations with appropriate torch packages.
The Lincoln 20 requires 3.5 CFM (cubic feet per minute) at 65 PSI. Any pancake or portable compressor rated at 4+ CFM at 90 PSI will work — these are widely available at home improvement stores for under $200. A 6-gallon tank is the minimum recommended; an 8 or 10-gallon tank gives more cut time between compressor cycles. The machine includes an integrated air pressure regulator, so you do not need a separate regulator between the compressor and the plasma cutter — just clean, dry air from the compressor. An inline moisture separator is recommended to extend consumable life.