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The ITW / Miller 27-13-2 ORNG is a high-temperature, fluid-sealing fluorocarbon (FKM/Viton) O-ring engineered for the internal passages of Miller Weldcraft WP-27 series water-cooled TIG (GTAW) torches. It isolates the closed-loop coolant system from the inert shielding gas stream and external atmosphere in high-current applications operating up to 500 Amperes.
Features
Anti-Cross Contamination Barrier: Prevents coolant from entering the inert gas lens to eliminate weld discoloration, tungsten degradation, and weld porosity
High Compression Set Resistance: Retains elastic memory and sealing force over multiple thermal cycling phases
High-Visibility Orange Pigmentation: Enables rapid visual verification of correct high-temperature FKM material installation
Flash-Free Molding Line: Eliminates mechanical bypass paths for uniform contact pressure across the 360-degree sealing seat
Specifications
Manufacturer: Illinois Tool Works (ITW)
Brand Division: Miller Electric / Weldcraft
Part Number (MPN): 27-13-2
Color Designation: Orange (ORNG)
Inside Diameter (ID): 3.175 mm (0.125 in / 1/8")
Cross Section (CS): 1.588 mm (0.0625 in / 1/16")
Outside Diameter (OD): 6.350 mm (0.250 in / 1/4")
Durometer Hardness: 70 to 75 Shore A
Tensile Strength: 14.0 MPa (Min) / 2030 psi (Min)
Elongation at Break: 175%
Material Composition: High-Temperature Fluorocarbon (FMC / FKM) Viton Base Compound
Continuous Service Temperature Range: -26°C to +204°C (-15°F to +400°F)
Short-Duration Thermal Spike Limit: 230°C (446°F)
Chemical Compatibility: Deionized water, ethylene glycol, propylene glycol
Shielding Gas Compatibility: Argon (Ar), Helium (He), Argon/Hydrogen mixtures
Shipbuilding and Marine Construction: High-current manual and automated orbital TIG welding of copper-nickel piping, aluminum hulls, and marine structural alloys
Aerospace Propulsion Systems: Welding of rocket motor casings, exhaust manifolds, and turbine housings on Inconel, Titanium, and Cobalt-base superalloys
Pressure Vessel Fabrication: Heavy-duty welding rigs for ASME Section VIII pressure vessels, pipeline joints, and offshore drilling riser tubes
Nuclear Power Plant Maintenance: Field weld repairs on thick-walled Type 316L stainless steel cooling loops
Cryogenic Equipment Production: Welding double-walled vacuum-insulated piping systems for liquid natural gas (LNG) transport
Food, Beverage, and Pharmaceutical Cleanrooms: Sanitary backing welds on thin-walled stainless steel process tubing
