SM099 U-notch Nut with Plug Assembly Kit

U‑notch Nut with Plug Assembly Kit is an all‑in‑one weld‑on fitting solution tailored for exhaust modification and testing work. This kit contains a U‑notch oxygen sensor nut and a matched threaded sealing plug. After welding the nut onto exhaust pipe, users can install oxygen sensors normally, or screw in the plug for temporary sealing while sensor is detached. It solves the leakage problem during exhaust system debugging, pipeline testing and vehicle trial run, greatly improving working efficiency for modification shops.

Two‑in‑one Kit Design for Flexible Working Modes

This assembly kit integrates mounting nut and sealing plug into one set. Under normal conditions, install oxygen sensor into the U‑notch nut for real‑time exhaust signal monitoring. For testing, maintenance or temporary sensor removal, screw the sealing plug into the nut to block the threaded hole, preventing exhaust gas leakage. No extra separate sealing accessories are needed, convenient for workshop inventory management. The U‑notch nut retains the advantage of easy sensor disassembly, resisting thread seizure under high‑temperature exhaust environment.

Optional Materials for Different Operating Environments

Customers can choose carbon steel or stainless‑steel version according to actual application scenarios. Carbon steel delivers high structural strength with cost‑effective price, perfect for short‑term test projects and cost‑sensitive modification orders. Stainless‑steel set features outstanding heat resistance and anti‑corrosion performance, suitable for long‑term on‑vehicle use, damp road conditions and heavy‑duty modified exhaust systems. Both nut and plug adopt matched material to guarantee consistent thermal expansion performance.

Standard M18×1.5 Thread & Reliable Sealing Performance

Precision CNC machined M18×1.5 thread for both nut and plug ensures tight thread fit. The sealing plug provides reliable temporary blocking effect, effectively avoids exhaust blow‑by during pipeline pressure test, leak detection and vehicle trial running. The U‑notch nut supports solid welding onto exhaust pipe, exhaust manifold and catalytic converter, stable connection against thermal cycling vibration of exhaust system.

Typical Application Scenarios

Mainly used in auto modification workshops, exhaust component manufacturers and exhaust test equipment labs. Common use cases include exhaust pipeline leak test, temporary sealing when sensor is dismantled, prototype exhaust development, off‑road temporary refit and subsequent formal oxygen‑sensor installation. Widely compatible with M18×1.5 thread requirement for American, European and Japanese modified vehicles.

Bulk Supply & Custom Service From Source Factory

Each SM099 kit undergoes thread matching inspection before packing. As direct factory, we support large‑volume wholesale for global buyers. Custom options include material selection, surface treatment and packing solution adjustment, to meet requirements of aftermarket distributors, modification stores and exhaust equipment manufacturers.