10N21 - 10N21 TIG Collet .020" for 17/18/26 Torches (5-Pack)

Reliable 10N21 Collet Replacements for 17, 18, and 26 Series Torches

Upgrade your TIG torch maintenance kit with this package of five Diamond Ground 10N21 Collets. These collets are the standard replacement part for holding .020-inch (0.5mm) tungsten electrodes in 17, 18, and 26 series TIG torches. For welders working on thin stainless steel, aluminum, or exotic alloys requiring low heat input and fine tungsten, the 10N21 is the essential link between your torch and the arc. A fresh collet ensures that your arc starts are crisp and your current transfer is consistent.

The collet is often the most overlooked part of the TIG torch, yet it performs one of the most vital functions: current transfer. As the back cap is tightened, the 10N21 collet is driven into the collet body, compressing around the tungsten. If the collet is worn, bent, or twisted from excessive heat, it creates a point of high resistance. This resistance generates excess heat inside the torch head—rather than at the weld puddle—which can damage your torch and lead to erratic arc behavior. These high-quality copper alloy collets are designed to withstand the rigors of the welding environment while maintaining their shape and grip.

Compatibility is broad, covering the most popular torch models used in fabrication shops today. Whether you are running a heavy-duty water-cooled setup or a portable air-cooled rig, if it is a 17, 18, or 26 series, this is the part you need for .020" tungsten. The 5-pack quantity is perfect for the professional welder's toolbox, ensuring you aren't left scrambling for a spare in the middle of a critical job. Keep your arc stable and your welds clean with these genuine replacement parts.

Installation and Maintenance

Installing the 10N21 is straightforward. Simply remove the back cap, slide out the old collet, and insert the new one with the split end facing the front of the torch (towards the collet body). Insert your .020" tungsten and tighten the back cap. Always inspect your removed collet for signs of discoloration or twisting. If the collet looks twisted, it indicates it was either over-tightened or overheated, and replacement is necessary to protect the integrity of your torch head and collet body.