The PT31 Plasma Cutting Torch is the smallest 40A plasma cutting torch on the market. The torch is rated at 40A in continuous operation for drag cutting with HF starts. Welding Knight PT-31 Air Plasma Cutting Torch with 13 Feet Cable M16 1.5 Brass Screw 2 Pins Connectors 40A Fit CUT40/CUT50/CUT50D/CT-312 Plasma Cutter Machine.