10N40 - ESAB Fuel Gas Hose Nut, B-Size 5/8-18 LH

Fix Your Fuel Lines with the ESAB 10N40 Nut

There is nothing more frustrating than a stripped thread or a crushed nut putting your welding torch out of commission. The ESAB 10N40 is your go-to replacement nut for fuel gas hoses. Whether you are running Acetylene, Propane, or Chemtane, this is the standard "B-Size" nut you need to get your rig back up and running. It features the industry-standard 5/8"-18 Left-Hand thread, ensuring it fits the vast majority of regulators and torch handles on the market today.

Why Left-Hand? You'll notice the small notches cut into the corners of this nut. That's the universal sign for "Left-Hand Thread." This means you turn it counter-clockwise to tighten it. This safety feature is there to make sure you never accidentally plug your fuel hose into your oxygen regulator—a mistake that could be disastrous. This nut is designed to keep you safe and your connections secure.

Don't rely on worn-out fittings that can lead to dangerous gas leaks. If your old nuts are rounded off from using pliers, or if the threads are cross-threaded, swap them out for a fresh brass nut. This part is perfect for building your own custom-length hoses or repairing a hose that has been cut or damaged near the fitting. Pair it with the correct size hose nipple (sold separately) and a ferrule or hose clamp, and you will have a factory-quality connection in minutes.

Application Tips

• Check Your Thread: Remember, Lefty-Tighty for fuel gas fittings!
• Use the Right Tools: Always use a proper wrench rather than pliers to avoid rounding off the soft brass hex.
• Leak Test: After installing a new nut and connecting your hose, always spray the connection with a leak detection solution to ensure a gas-tight seal before lighting your torch.