632811 - ESAB ST-16 / ST-21 TIG Torch Collet Nut

Genuine ESAB Replacement for Heliarc Torches

The ESAB 632811 Collet Nut is a critical consumable component designed specifically for the classic ST-16 and ST-21 series TIG torches. As part of the torch's front-end assembly, this collet nut plays a vital role in the welding process by applying the necessary clamping force to the collet, which in turn secures the tungsten electrode in position. Manufactured to ESAB's precise engineering standards, this component ensures that the electrode remains centered and stable, even during high-amperage applications or extended welding sessions.

Constructed from high-quality brass alloy, the 632811 collet nut offers excellent thermal conductivity and mechanical durability. In TIG welding, the transfer of electrical current from the torch body to the tungsten is paramount for maintaining a consistent arc. A worn or damaged collet nut can lead to poor contact, resulting in arc wandering, overheating of the torch head, or inconsistent weld beads. By replacing worn components with genuine ESAB parts, operators ensure that the electrical path remains unimpeded and efficient.

Furthermore, the integrity of the collet nut threads is essential for the proper sealing of the torch assembly. A secure fit prevents atmospheric contamination from entering the shielding gas stream, thereby protecting the weld pool from oxidation and porosity. This specific part is engineered to withstand the thermal cycling inherent in TIG welding without seizing or deforming, provided it is tightened to the correct specifications. For industrial maintenance and repair operations utilizing ST-16 or ST-21 equipment, stocking the 632811 ensures minimal downtime and sustained equipment reliability.

Whether you are refurbishing an older Heliarc torch or performing routine maintenance, using OEM parts like the ESAB 632811 guarantees compatibility and performance. It is a direct replacement part that requires no modification to the existing torch body, allowing for quick and easy installation.