Muffler Clamp Band Fittings for EGT Probe Sensors

When a Clamp Fitting is Preferred Over a Threaded Compression Fitting

Compression fittings threaded into welded bungs are generally the most secure and leak-resistant method for mounting an EGT probe. However, they require permanent modification to the exhaust pipe, a tap tool, and wall thickness compatible with NPT threading.

Muffler clamp fittings address situations where that approach is not practical: thin-wall performance exhausts that cannot accept NPT threads without compromising wall integrity, aftermarket slip-fit pipe sections that are not tapped, and racing categories where a non-invasive probe mount is required for quick installation and removal between events.

The muffler clamp band grips the outside of the exhaust pipe by tightening a band screw that closes a slotted collar. The 3/16-inch EGT probe passes through a hole drilled in the pipe wall and is captured by the compression ferrule in the clamp body, which locks the probe at the user-selected insertion depth. The clamp band then secures the entire assembly against axial pullout and rotation.

This fitting is designed for use with 3/16-inch outer diameter EGT probes only. Using it with 1/8-inch or 1/4-inch probes is not recommended and will not produce a reliable fit.

Five Sizes and How to Select the Right One

Five clamp sizes cover exhaust pipe outside diameters from 0.75 inch up to 5.5 inches.

• Extra Small (0.75–1.5 inch) covers kart and small-bore single-cylinder pipes 
• Small (1.5–2.5 inch) is the default clamp supplied with TSC Muffler Clamp EGT probes 
• Medium (2.3–3.2 inch) covers most 2-inch and 2.5-inch performance exhaust pipes 
• Large (3.3–4.2 inch) is appropriate for V6, V8, and 3-inch diesel applications 
• Extra Large (3.6–5.5 inch) covers 4-inch and 5-inch diameter pipes used in diesel, marine, and industrial applications 

Size ranges overlap intentionally. When the pipe OD falls within an overlap region, choosing the smaller clamp generally provides a tighter clamping engagement and more secure retention under vibration. If the pipe OD is at the top of a range, moving to the next size up provides additional adjustment range for proper band tension.

Installation Best Practices for Secure Probe Retention

Probe insertion depth into the exhaust stream should be set with the same care regardless of the fitting type. For 3/16-inch probes in a gas exhaust application, inserting the tip approximately 10 to 25 mm into the stream — measured from the inside pipe wall — places the junction within the gas flow without extending too far toward the center of the pipe where velocity is typically highest.

After setting the insertion depth, tighten the compression ferrule first to secure the probe, then tighten the band screw to lock the assembly against the pipe. Re-check insertion depth after the initial heat cycle, as thermal expansion of the pipe and clamp components can slightly change clamping force.

Refer to the EGT Probe Mounting Instructions document available in the product downloads for the full installation procedure and torque specifications.