Canadian owned and operated
The 300M Medium Back Cap is a critical component designed for the assembly and operation of 17, 18, and 26 series TIG welding torches. Serving as a direct replacement for the industry-standard 300M part number, this back cap is engineered to provide a secure seal and precise electrode positioning. The back cap functions by threading into the rear of the torch head, applying axial pressure to the collet. This action compresses the collet against the collet body, firmly gripping the tungsten electrode to ensure stable electrical conductivity and prevent slippage during welding operations.
Constructed from high-temperature, high-impact polymers, the 300M back cap is built to withstand the thermal cycling and mechanical stresses inherent in industrial welding environments. The medium profile of this cap offers a strategic advantage in specific welding applications. Unlike the standard long back cap (57Y02), which accommodates full-length 7-inch tungsten electrodes but increases the overall length of the torch, the medium cap reduces the torch profile. This reduction allows for improved access in restricted spaces while still accommodating tungsten electrodes of moderate length, unlike the short back cap (57Y04) which requires significantly cut-down electrodes.
Integral to the design is a fitted O-ring, typically made from durable silicone or rubber compounds resistant to shielding gases like Argon and Helium. This O-ring creates a hermetic seal at the back of the torch head, preventing atmospheric contamination of the shielding gas stream. Maintaining this seal is vital for preventing porosity and oxidation in the weld pool. This generic replacement component is manufactured to strict tolerance standards, ensuring compatibility with major torch brands including Weldcraft, CK Worldwide, Miller, and Lincoln Electric, specifically for models such as the WP-17 (air-cooled), WP-18 (water-cooled), and WP-26 (air-cooled).
Key Technical Specifications:
| Additional Information |
|---|
| Packaging Description:1 Per Ea, 2 in a pack |
| Item:Back Cap Medium |
| Brand:Generic |
| Torch Model:WP-17, WP-18, WP-26 |
| Accessory Type:Back cap |
| Compatible Brand/Model:CK, Esab, Lincoln, Miller, Weldcraft |
| ----- new values below ---- |
| Torch Model:WP-17, WP-18, WP-26 |
| Accessory Type:Back Cap |
| Compatible Brand/Model:Weldcraft, Miller, CK, Lincoln, Esab |
| Item:back-cap-medium |
| Brand:generic |
| Packaging Description:1-per-ea |
