12K15 - ESAB 5/8-18 Brass Connection Nut for Welding Hose

Keep Your Gas Lines Secure with ESAB

There is nothing more frustrating than a stripped nut on your regulator or a leaky hose connection right when you are ready to lay a bead. The ESAB 12K15 Connection Nut is the direct replacement you need to fix those worn-out B-size connections. If you are building a new extension hose or repairing a damaged end on your TIG or MIG setup, this brass nut is the standard hardware you need. It features the common 5/8"-18 thread found on almost all inert gas regulators and flowmeters.

Why settle for cheap hardware store fittings that might not seat correctly? This ESAB nut is machined specifically for the welding industry. The 0.359" ID is sized perfectly to slip over your standard hose nipple, allowing you to tighten it down securely without binding. The brass construction ensures it won't rust tight to your regulator, making future changeouts easier. Plus, it's UL listed, so you know it's built to handle the pressures and rigors of a working shop.

Don't let a $5 part ruin a $500 job. Leaky connections waste expensive shielding gas and can suck in atmosphere, ruining your weld quality. Keep a few of these 12K15 nuts in your toolbox or parts bin. Whether you are swapping out torches, fixing a crimped hose, or setting up a new machine, having the right connection hardware ensures you get a gas-tight seal every time. Simple, reliable, and built to last—exactly what you expect from ESAB.