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

Keep Your ST-16 & ST-21 Torches Running Smoothly

If you are running an ESAB ST-16 or ST-21 TIG torch, you know these workhorses are built to last, but even the best equipment needs maintenance. The ESAB 632811 Collet Nut is the exact replacement part you need when your old nut starts to show signs of wear. Over time, heat and constant tightening can strip threads or warp the shape of your collet nut, leading to slipping tungsten and frustrating arc starts. Don't let a small part ruin your weld quality; swap it out with a fresh, genuine ESAB nut to keep your setup tight and right.

This collet nut isn't just a piece of brass; it's the anchor for your tungsten. When you tighten the back cap, this nut compresses the collet against the torch body, locking your electrode in place. If this connection is loose or gritty, you lose current transfer. That means your machine might say 150 amps, but your arc feels weak and unstable. The ESAB 632811 is machined perfectly to mate with your ST-series torch, ensuring maximum contact area for smooth, buttery arcs every time you light up.

Installation is straightforward—simply unscrew the old unit and thread this one on. It’s designed to handle the heat of daily welding without seizing up, making consumable changes quick and painless. Whether you are welding aluminum, stainless, or mild steel, having a secure front end on your torch is the first step to a perfect bead. This part is essential for any welder looking to maintain the precision and reliability of their classic Heliarc equipment.

Don't risk your weld quality with ill-fitting generic parts that might damage your torch head. Stick with the OEM ESAB 632811 Collet Nut for a guaranteed fit and the durability you expect from the ESAB brand. Keep a spare in your toolbox so you are never caught off guard by a stripped thread in the middle of a job.