12 Pcs O2 Sensor Bung, 304 Stainless Steel M18x1.5 O2 Bung

HOHNNYREET 12-piece M18x1.5 O2 sensor bungs are stepped, weld-in fittings made from 304 stainless steel to accept standard oxygen sensors for exhaust systems.

This kit provides a dozen ready-to-weld bungs engineered to accept universal M18x1.5 oxygen sensors. Each bung uses 304 stainless steel for corrosion resistance and a stepped profile so the sensor sits flush when installed. The set is aimed at fabricators, exhaust shops, and vehicle owners who need reliable sensor ports for repairs, custom exhausts, or sensor relocation projects.

How do these stepped O2 bungs simplify welding and installation?

The stepped design creates a clear shoulder for welding and helps center the sensor for a neat, flush fit. That geometry shortens tack-weld time and reduces warping risk during fabrication. Installers report faster alignments and fewer post-weld adjustments.

• Stepped profile provides a defined weld surface and sensor seat
• Precision-cut M18x1.5 threads for smooth sensor threading
• Consistent dimensions across all 12 pieces for repeatable installs

What materials and durability can I expect from these sensor bungs?

Constructed from 304 stainless steel, these bungs resist rust and oxidation better than mild steel in typical exhaust environments. 304 grade balances toughness with weldability, making it suitable for most automotive exhaust work. Proper welding technique and shielding will maximize longevity.

• 304 stainless steel resists corrosion in exhaust applications
• Durable under high-heat cycles common to exhaust systems
• Compatible with common welding methods used in automotive shops

Are these bungs compatible with my vehicle’s oxygen sensors and threads?

Yes — each bung features a standard M18 x 1.5 thread size that matches the vast majority of automotive oxygen sensors. They accept threaded O2 sensors without adapters and secure the sensor tip at the correct depth thanks to the stepped inner seat. Always confirm your sensor thread spec before purchase if using a nonstandard part.

• Standard M18x1.5 threads fit most oxygen sensors
• Stepped seat aligns sensor tip for accurate exposure to exhaust flow
• Sold as a 12-piece set for multiple repairs or projects

What installation tips improve fit and function?

Clean mating surfaces and use proper weld shielding to avoid oxidation and overheating the sensor port. Tack-weld first to check alignment, then complete the weld to minimize distortion. Allow parts to cool to prevent thread damage before threading in sensors.

• Deburr and clean pipe where the bung will weld for a solid bead
• Tack-weld, verify alignment, then finish the weld to reduce warpage
• Use anti-seize on sensor threads if recommended by the sensor maker

Who is this for: This 12-piece HOHNNYREET stepped O2 bung set is intended for exhaust fabricators, performance tuners, repair shops, and DIY mechanics who regularly install or relocate oxygen sensors. It’s useful when building custom exhaust sections, repairing rusted sensor ports, or prepping multiple vehicles — the pack size and standardized M18x1.5 threads make it a convenient, repeatable solution for professionals and hobbyists alike.