18-7 - CK Worldwide 18-7 Back Cap Insulator for 17/18/26 Series TIG Torches

Industrial Grade Back Cap Insulator for 3 Series Torches

The CK Worldwide 18-7 Back Cap Insulator is a critical component designed for the maintenance and repair of standard TIG welding torches. Specifically engineered for the 3 Series torch bodies, this insulator is fully compatible with industry-standard models including the WP-17, WP-18, and WP-26, as well as their equivalents from major manufacturers such as Weldcraft, Miller, Lincoln, WeldTec, and Profax. The insulator serves a dual purpose in the torch assembly: it provides necessary electrical isolation between the charged torch body and the back cap, and it creates a seal to prevent the escape of shielding gas.

Manufactured from high-durability, heat-resistant materials, the 18-7 insulator withstands the thermal cycling inherent in TIG welding operations. Failure of this component can lead to gas turbulence, loss of shielding coverage, and potential electrical hazards if the back cap becomes energized. This part is a direct replacement for the standard 18-7 nomenclature found in technical diagrams for air-cooled and water-cooled torches in the 150A to 350A range. It is compatible with standard rigid bodies, flex heads, and valve-equipped models within the specified series.

For industrial MRO applications, maintaining a stock of 18-7 insulators is recommended to minimize downtime. The component is easily installed by hand during routine consumable changes or back cap adjustments. It fits seamlessly with standard collet bodies and gas lens setups, ensuring that the torch geometry remains within specification for optimal arc control.

Technical Specifications

• Industry Standard Part: 18-7
• Compatibility: 17, 18, 26, 150, 210, 300, 510, FL3L, CKM350, CWHTL300
• Function: Electrical insulation and gas sealing
• Installation Location: Rear of torch head, under back cap