HOHNNYREET O2 Sensor Bungs M18x1.5 Stepped Weld-In 12-Pack, 304 Stainless Steel, Weld-Friendly

HOHNNYREET 12 Pcs O2 Sensor Bung set is a stepped, weld-in M18x1.5 adapter kit made from 304 stainless steel for secure, corrosion-resistant oxygen sensor installations.

Whether you're building or repairing exhaust systems on cars, trucks, or custom projects, these oxygen sensor bungs provide a reliable, professional-grade mounting point. The pack of twelve stepped-style bungs is designed for straightforward welding and long-term resistance to heat and corrosive exhaust gases. Each bung uses the common M18x1.5 thread to accept standard O2 sensors, making this kit a practical, cost-effective choice for garages, fabrication shops, and DIY mechanics.

How do these bungs simplify O2 sensor installations?

The stepped design offers a clear alignment point and a flush finish after welding, reducing the need for grinding or additional trimming. That makes positioning and sealing faster and more repeatable, especially when working on multiple pipes or builds.

• Pre-stepped mounting face for consistent weld surfaces
• Ready for TIG or MIG welding with minimal prep
• Threaded M18x1.5 bore fits common sensors without adapters

What materials and finishes protect the bungs from exhaust conditions?

Manufactured from 304 stainless steel, these bungs resist rust and scaling at elevated temperatures better than many mild steels or plated options. The alloy's balance of chromium and nickel helps maintain strength and appearance over time in exhaust applications.

• 304-grade stainless for corrosion resistance
• Durable against thermal cycling in exhaust systems
• Weld-friendly metallurgy for strong joints

Will these fit my oxygen sensor and exhaust tubing?

Each bung features a standard M18x1.5 internal thread, which matches the majority of automotive O2 and wideband sensors. The stepped outer profile accommodates common pipe thicknesses and helps center the sensor for accurate readings and a tight seal.

• M18x1.5 thread matches most aftermarket and OEM sensors
• Stepped outer shape adapts to varied tube diameters
• Sold in a 12-piece pack for multiple installs or spares

How should I weld and position these for best results?

Clean the area of paint, scale, and grease before tacking the bung in place. Use short weld passes to avoid warping tubing and ensure the sensor sits straight and flush to prevent leaks and misalignment.

• Degrease and abrade mounting area before welding
• Use tack welds, then finish in short segments to control heat
• Orient bung so sensor tip clears pipe interior and faces flow correctly

Who is this for: The HOHNNYREET 12-piece O2 sensor bung kit is aimed at professional exhaust fabricators, automotive repair shops, builders of custom exhaust systems, and hobbyists who want a dependable, repeatable sensor mount. If you frequently install or replace oxygen sensors, run diagnostic sensors on test rigs, or fabricate headers and mid-pipes, this stainless-steel stepped bung pack gives you a durable, weld-ready solution without the need for additional threading or adapters.