HEBRAR Clamp-On Oxygen Sensor Adapter for 2-1/4"–2-1/2" Exhaust Pipes — M18x1.5 Thread, 304 Stainless No-Weld Kit

HEBRAR’s clamp-on oxygen sensor adapter lets you add a wideband O2 sensor to 2-1/4"–2-1/2" exhaust pipes without welding.

When you need to mount a wideband air/fuel ratio sensor quickly and reliably, this clamp-on bung kit offers a durable, no-weld solution. Crafted from 304 stainless steel with a universal M18x1.5 female thread, the kit includes the bracket, flanges, gaskets and hardware required for a complete installation. It fits exhaust tubing from 2-1/4" to 2-1/2" (57–63 mm) and is intended to create a tight, leak-resistant port for aftermarket oxygen sensors and extenders.

How does the clamp-on design make installation easier?

The HEBRAR adapter eliminates the need to weld a bung to the exhaust, saving time and avoiding heat-related damage. You drill a single 13/16" hole, position the clamp around the pipe, and fasten the included bolts and nuts. This approach is reversible and suitable for hobbyists and garage installs.

• No welding required — attaches with two bolts and nuts.
• Pre-machined flange and crush washers ensure sealing.
• Simple three-step install: mark, drill, clamp and thread sensor.

Will this adapter prevent exhaust leaks and sensor instability?

The kit includes a gasket, crush washers and a removable sensor spacer to reduce the chance of exhaust leakage and to stabilize the sensor. The clamp’s mating surfaces and hardware are designed to compress the seal uniformly for a tight fit on properly prepared tubing.

• 304 stainless steel construction resists corrosion for long-term sealing.
• Gasket and crush washers included to improve leak prevention.
• Removable spacer keeps sensor position consistent and protects tip.

Which sensor types and thread sizes are supported?

This adapter is built around a universal M18 x 1.5 female thread, the common standard for most wideband and many narrowband oxygen sensors. The kit accommodates typical wideband sensor housings and provides the correct thread interface to accept most aftermarket units without additional fittings.

• M18x1.5 female thread — fits the majority of wideband O2 sensors.
• Includes a spacer/adapter for clearance and tip protection.
• Works with sensors that require a straight bung mounting orientation.

What pipe sizes and vehicle applications does it fit?

The clamp bracket adjusts to secure exhaust tubing from 2-1/4" to 2-1/2" in diameter, covering popular exhaust diameters on many cars, light trucks and custom exhaust sections. Check pipe outer diameter before ordering to ensure a proper fit.

• Fits 2-1/4"–2-1/2" (57–63 mm) exhaust tubing OD range.
• Appropriate for OEM replacement or custom exhaust sections.
• Not intended for pressurized or damaged pipe without repair first.

Who is this for: The HEBRAR clamp-on wideband O2 sensor adapter kit is suited for DIYers, tuners, mechanics and performance enthusiasts who want a fast, affordable way to add or relocate a wideband oxygen sensor without welding. It’s ideal when you need a temporary test port, a reversible installation, or a corrosion-resistant, threaded sensor mount for diagnostics or tuning. Always confirm pipe diameter and sensor thread compatibility before purchase, and follow safe drilling and exhaust-handling practices during installation.