8-3360 - Thermal Dynamics 1/8 NPT to 1/4 Tube Straight Adapter Fitting

Get Your Plasma Cutter Back in Action

When you are in the middle of a fabrication project, the last thing you need is a gas leak shutting down your plasma cutter. The Thermal Dynamics 8-3360 Adapter is the exact part you need to connect your gas lines securely and get back to cutting metal. This fitting is designed to convert a standard 1/8 NPT threaded port to a 1/4-inch tube line, a common configuration in many Thermal Dynamics plasma systems. If you have noticed a hissing sound near your air inlet or if your machine is throwing low-pressure codes, a damaged or corroded fitting could be the culprit.

Don't risk your cut quality with makeshift plumbing store fixes. Plasma cutters require clean, consistent air or gas flow to cool the torch and constrict the arc for a clean cut. Using the wrong fitting can restrict airflow or cause pressure drops that lead to jagged cuts and blown consumables. The 8-3360 is a straight (ST) adapter, meaning it provides a direct, inline connection that is easy to install even in tight spaces inside the machine or at the back of the unit. It is built to handle the pressures required for plasma cutting, giving you peace of mind that your connection is safe and secure.

This adapter is a genuine Thermal Dynamics part, which means it fits right the first time. There is no guessing about thread pitch or tube compatibility. The 1/8 NPT threads are tapered to create a tight seal, while the 1/4-inch tube side is precision-engineered to grip the tubing firmly without crushing it. Whether you are running a shop air setup for mild steel or specialized gases for stainless, this fitting is the reliable link in your supply chain.

Keep a spare 8-3360 in your toolbox or parts bin. Fittings can easily get cross-threaded or damaged during routine maintenance or when moving equipment around the shop. Having this replacement part on hand means the difference between a five-minute fix and a two-day wait for shipping. Trust in OEM quality to keep your torch firing and your production schedule on track.