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The ESAB 9-7831 is a genuine Original Equipment Manufacturer (OEM) basic torch head replacement body for the Thermal Dynamics PCH-120 manual legacy plasma arc cutting system. This 90-degree head serves as the central electro-mechanical interface for the handheld plasma torch, managing high-amperage current transmission, internal cooling, and gas flow distribution. It is a modular component designed to be installed into the existing PCH-120 handle shell and cable lead assembly.
Features
Electrical Tracking Resistance: Specialized insulating body prevents high-voltage HF pilot arc from grounding prematurely within the head
Optimized Gas Flow Channels: Internal channels direct gas through the swirl baffle and nozzle to concentrate the plasma arc and reduce dross
Modular Repair Design: Allows for replacement of the head body independently of the handle shell and cable leads
Precision-Machined Internal Threads: Provides flush seating for electrodes and starter cartridges to prevent gas leaks and stabilize airflow
Ergonomic 90° Geometry: Balances the torch center of gravity to reduce wrist strain during manual profile cutting or beveling
High-Amperage Thermal Management: Engineered to handle 120A current without warping, cracking, or structural melting
OEM Fitment: Genuine replacement part ensures compatibility with existing PCH-120 components
Specifications
Manufacturer: ESAB / Thermal Dynamics
Part Number (MPN): 9-7831
Airgas Part Number: TDC9-7831
Torch Model Compatibility: PCH-120 Hand Torch
Torch Configuration: Handheld / Manual Cutting
Head Angle: 90-Degree geometry
Maximum Current Rating: 120 Amps
Duty Cycle: 100% at standard operating thresholds
Cooling Mechanism: Compressed Air (Gas Cooled)
Gas Flow System: Dual-flow (secondary gas for thermal dissipation and arc shielding)
Conductive Materials: Tellurium copper and brass alloys
Insulation Materials: High-dielectric engineered polymers and vulcanized silicone compounds
Package Contents: Basic Torch Head Body Only (1 per pack)
Exclusions: Does not include outer plastic handle shell, trigger switches, consumables, or cable lead assemblies
