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The ESAB 57Y04 is a short, low-profile back cap engineered for Gas Tungsten Arc Welding (GTAW/TIG) torches. It serves a dual technical purpose: providing axial compression against the collet to secure the tungsten electrode and establishing a hermetic seal at the rear of the torch head to prevent shielding gas contamination. Its compact design is specifically intended to minimize the torch's mechanical footprint for operation in restricted environments.
Features
Axial Collet Compression: Applies direct force to the collet to ensure stable electrical conductivity and prevent electrode slippage
Hermetic Shielding Gas Seal: Integrated elastomer O-ring prevents inert gas escape and blocks atmospheric oxygen/nitrogen entry
Dielectric Properties: Phenolic body prevents high-frequency arc wandering and rear-torch shorting
Confined Space Optimization: Reduces rear clearance envelope by up to 75% compared to long back caps
Material Waste Reduction: Enables the use of depleted tungsten "stubs" that are too short for standard caps
Thermal Engineering: Brass insert allows for consistent thermal expansion cycles without seizing or stripping
Pre-Assembled Sealing: Delivered with pre-fit O-rings to ensure immediate gas-tight integrity
Universal 3-Series Interoperability: Compatible with global standard "Big Series" TIG torch architectures
Specifications
Manufacturer: ESAB
Manufacturer Part Number (MPN): 57Y04
Alternative SKUs: 57Y04-XCP1, 57Y04-XCP2
Airgas Part Number: ESA57Y04
Product Size Designation: Short / Low-Profile
Total Component Length: 24.00 mm (0.94 inches to 1.00 inch nominal)
External Maximum Diameter: 17.00 mm (0.67 inches)
Thread Specification: 3/8" x 32 UNEF (Unified Extra Fine Thread) / 3/8" UNF Alternate
Amperage Capacity Rating: 150A to 350A (Continuous)
Maximum Electrode Capacity: Accepts shortened tungsten electrodes/stubs up to 88.9 mm (3.50 inches)
Body Material: Phenolic Resin Compound (Molded Thermoset Plastic)
