639995 - ESAB Brass Connection Nut 7/8-14 Thread

Keep Your Gas Flow Secure with Genuine ESAB Parts

As a welder, you know that your regulator and gas connections are the lifeline of your operation. A stripped or damaged nut on your regulator isn't just an annoyance—it's a safety hazard and a guaranteed way to waste expensive shielding gas. The ESAB 639995 Connection Nut is the direct replacement part you need to fix those worn-out connections and get back to welding. Designed with a 7/8"-14 thread (listed as .88-14F), this nut is built to fit specific ESAB regulators and gas equipment, ensuring you don't have to fight with mismatched threads or leaky seals.

Why does the specific nut matter? In the world of welding, gas leaks can lead to porosity in your welds, inconsistent arc stability, and increased project costs. This brass nut is machined specifically to seat your regulator nipple firmly into the cylinder valve or manifold connection. The 0.666-inch internal diameter is sized perfectly to slide over the corresponding stem, allowing the nut to pull the sealing surfaces together tightly. Because it is made of brass, it won't spark if your wrench slips, and it resists seizing up, making cylinder changes smoother and faster.

Over time, the threads on connection nuts can become rounded off or cross-threaded from frequent cylinder swaps. Continuing to use a damaged nut can ruin the threads on your regulator stem or the cylinder valve itself. Swapping out a beat-up nut for a fresh ESAB 639995 is a cheap and easy maintenance task that protects your more expensive equipment. It’s always a good idea to keep a few of these in your toolbox or shop drawer. You never know when a thread is going to give out, and having the right spare part on hand means the difference between finishing the job on time or shutting down to run to the supply store.

This nut is compatible with various ESAB gas apparatus setups. When installing, always hand-tighten first to ensure the threads are engaged correctly before taking a wrench to it. This simple practice, combined with high-quality brass hardware, ensures your shielding gas system remains leak-free, safe, and reliable for every bead you lay down.