HOHNNYREET 12-Piece M18x1.5 O2 Sensor Bungs Weld-In Kit — 304 Stainless Steel Stepped Style for Exhausts

HOHNNYREET 12 pcs M18x1.5 stepped O2 sensor bungs are stainless steel weld-in adapters designed to accept standard oxygen sensors for robust, corrosion-resistant installations.

These stepped-style bungs provide a reliable way to add or replace oxygen sensor mounting points in exhaust systems, headers, or custom fabrication projects. Built from 304 stainless steel with precision M18 x 1.5 threads, the kit offers a consistent, professional fit and simplifies welding for mechanics and hobbyists alike.

How do these bungs make welding an O2 sensor point easier?

The stepped profile creates a flat, stable surface that aligns the sensor bung during tack and final welds, reducing fitment fiddling and improving ease of installation. The geometry helps achieve a flush finish that sits true to the exhaust wall.

• Stepped design centers and supports the bung during welding
• Flat flange area reduces warping and improves weld penetration
• Pre-cut M18x1.5 threads ensure sensor-ready openings after welding

Will these fit my oxygen sensor and exhaust tubing?

These bungs accept any standard M18 x 1.5 oxygen sensor thread, making them compatible with most factory and aftermarket O2 sensors. They are intended for welding into metal exhaust components where a threaded sensor port is required.

• M18 x 1.5 thread matches common O2 sensor specifications
• Sized for welding into headers, downpipes, mufflers, and piping
• Universal fit for most automotive and custom exhaust setups

What makes 304 stainless steel a good choice for these bungs?

304 stainless combines corrosion resistance with good strength at elevated temperatures, which is ideal for exhaust environments. It resists rusting in road and salt conditions and holds up through repeated heating cycles.

• High corrosion resistance extends service life
• Suitable for high-heat exhaust exposure
• Durable finish reduces need for frequent replacement

How many pieces come in the package and who benefits most from this kit?

The set includes twelve welded-in sensor bungs, offering enough parts for multi-cylinder engines or multiple fabrication projects. This quantity helps shops, performance builders, and DIYers keep spares on hand and handle several vehicles without immediate reordering.

• 12 bungs per kit for multiple installations or backups
• Ideal for professional shops, custom builders, and enthusiasts
• Consistent parts reduce time spent matching components

Who is this for: This HOHNNYREET 12-piece kit is aimed at mechanics, exhaust fabricators, performance tuners, and home garage enthusiasts who need reliable, weld-in O2 sensor ports. If you work on headers, custom exhaust, or retrofit sensor locations and want durable, corrosion-resistant adapters with standard threading, this kit supplies a practical, cost-effective solution.