KP52068-1 - Lincoln Electric Medium Back Cap for PTA-9 and PTA-20 TIG Torches

Genuine Lincoln Electric Medium Back Cap for TIG Welding

The Lincoln Electric KP52068-1 Medium Back Cap is an essential consumable for professional TIG welders using the Pro-Torch™ series. Designed specifically for the PTA-9, PTA-20, and PTW-20 torches, this back cap serves a critical role in the assembly of your TIG torch head. It screws into the back of the torch body, applying the necessary pressure to the collet to securely grip the tungsten electrode. Without a properly functioning back cap, your tungsten may slip, or you may experience inconsistent electrical contact, leading to poor weld quality.

One of the primary functions of the back cap is to create an airtight seal for the shielding gas. The KP52068-1 comes equipped with a high-quality O-ring that prevents expensive shielding gas (such as Argon) from leaking out the back of the torch. Gas leaks not only waste consumables but can also introduce atmospheric contamination into your weld pool, causing porosity and defects. By using genuine Lincoln Electric parts, you ensure that the thread pitch and O-ring sizing are exact matches for your equipment, maintaining the integrity of your gas coverage.

The "Medium" size of this back cap is a favorite among fabricators because it offers excellent versatility. Unlike short caps, which require you to cut your tungsten down significantly, the medium cap allows you to use a reasonable length of tungsten electrode, reducing waste and prep time. At the same time, it is shorter than the long back cap, making it easier to maneuver the torch in somewhat restricted spaces where a full-length cap might get in the way. It is constructed from durable, high-temperature phenolic materials designed to withstand the radiant heat of the welding arc without cracking or deforming.

At Josef Gas, we recommend keeping spare back caps on hand. Over time, the threads can wear, or the O-rings can dry out and crack due to heat exposure. Replacing your back cap is a simple, low-cost maintenance step that can prevent frustrating downtime and troubleshooting issues related to gas flow and arc stability.