56Y40 - ESAB HW-90 Long Back Cap 56Y40 (Pack of 2)

Product Overview

The ESAB 56Y40 Long Back Cap is a specialized consumable designed for use with the HW-90 series TIG welding torches. As a critical component of the torch assembly, the back cap serves two primary functions: it applies pressure to the collet to secure the tungsten electrode in place, and it seals the back of the torch head to prevent shielding gas leakage. This specific model is the "Long" version, which is engineered to accommodate standard 7-inch (175mm) tungsten electrodes, allowing operators to utilize new electrodes without the need for cutting them down.

Manufactured from high-grade, heat-resistant polymers, the 56Y40 is built to withstand the thermal cycles and mechanical stress typical of industrial welding environments. The cap features precision-molded threads that ensure a smooth engagement with the torch body, reducing the risk of cross-threading or overtightening. It comes equipped with a sealing O-ring, which is essential for maintaining the integrity of the inert gas shield, thereby preventing atmospheric contamination of the weld pool.

This product is supplied in a pack of 2, providing welders with a spare unit for immediate replacement should damage or loss occur during operation. Maintaining a good condition back cap is vital for consistent electrical conductivity and gas coverage.

Compatibility

This back cap is specifically referenced for the ESAB/Linde/L-Tec HW-90 TIG torch platform. Users should verify their torch model before purchase, as thread pitches and diameters vary significantly between TIG torch series (e.g., 17/18/26 vs. 9/20 vs. HW-90).