The Genuine Honda Catalytic Converter & Exhaust Pipe Mounting Bolt (18176-PT0-003) is an original equipment replacement fastener designed for specific Honda and Acura exhaust system applications. Commonly identified as the Converter Bolt or Converter & Pipe Rear Bolt, this factory-style fastener is used to secure designated catalytic converter and exhaust pipe connections.

Manufactured to Honda's original equipment specifications, this bolt features a threaded shaft, splined section, and flat head designed for its intended exhaust mounting arrangement. Its factory-style construction makes it an ideal replacement for original hardware that has become corroded, damaged, stripped, or seized during exhaust system maintenance.

Exhaust mounting hardware is exposed to repeated heating and cooling cycles, road moisture, and corrosion. Over time, these conditions can make factory bolts difficult to remove or unsuitable for reuse. Replacing compromised hardware with genuine Honda components helps restore the intended exhaust connection.

Whether replacing a catalytic converter, servicing factory exhaust piping, or restoring an older Honda exhaust system, Honda part number 18176-PT0-003 provides an OEM replacement solution for applications that specify this fastener.

Features

• Genuine Honda OEM Part: Original equipment replacement hardware manufactured to Honda specifications.

• Honda Part Number 18176-PT0-003: Factory identification for accurate replacement.

• Catalytic Converter Mounting Application: Designed for specified converter and exhaust pipe connections.

• Factory-Style Construction: Matches the intended original mounting configuration.

• Threaded Shaft: Designed for engagement with the appropriate factory exhaust hardware.

• Splined Shoulder: Features a splined section for its designated mounting arrangement.

• Flat-Head Design: Matches the original bolt configuration.

• Metal Construction: Designed for automotive exhaust fastening applications.

• Direct OEM Replacement: Replaces the original fastener where this part number is specified.

• Exhaust System Service Component: Useful during catalytic converter and exhaust pipe replacement.

• Corrosion Repair: Replaces rusted or seized original mounting bolts.

• Factory Restoration: Helps retain original Honda exhaust hardware specifications.

• Individual Replacement: Available as a single bolt for targeted repairs.

• Honda OEM Quality: Eliminates the need to substitute an incorrectly sized generic fastener.

Popular Performance Applications

Honda 18176-PT0-003 is used in a variety of factory exhaust configurations. Applications should be confirmed using the specific vehicle's OEM parts diagram.

Common cataloged vehicle families include:

• Honda Accord: Selected 1990–2017 applications.

• Honda CR-V: Selected 2015–2019 applications.

• Honda Odyssey: Selected 1999–2024 applications.

• Honda Pilot: Selected 2003–2022 applications.

• Additional Honda/Acura Models: Other applications where the factory exhaust diagram specifies part number 18176-PT0-003.

Performance and Restoration Uses

• Factory catalytic converter replacement.

• OEM exhaust system restoration.

• Exhaust pipe and converter connection repairs.

• Replacement of rusted or seized factory hardware.

• Maintenance of original exhaust mounting arrangements.

• Street-driven Honda and Acura restoration projects.

Fitment Note: The model ranges above represent cataloged applications, not every trim, engine, or exhaust configuration within those years. Confirm compatibility using the vehicle's VIN or factory parts diagram before ordering.

This bolt should not be assumed compatible with aftermarket headers, high-flow catalytic converters, or custom exhaust systems unless those components retain the corresponding factory mounting arrangement.

Additional Information

• Manufacturer: Honda Motor Co., Ltd.
• Brand: Genuine Honda
• Part Number: 18176-PT0-003
• OEM Description: Bolt, Converter (Yutaka)
• Alternate Description: Converter & Pipe Rear Bolt
• Product Type: Catalytic Converter / Exhaust Pipe Mounting Bolt
• Material: Metal
• Finish: Factory Metal Finish
• Head Style: Flat Head
• Shaft Design: Partially Threaded with Splined Shoulder
• Primary Application: Factory Catalytic Converter and Exhaust Pipe Connections
• Fitment: Vehicle-Specific OEM Exhaust Applications
• Country of Manufacture: Japan, as indicated on the Honda packaging
• Supersedes: 18176-PT3-A00 and 18176-PH4-731
• Quantity: One Bolt

Genuine Honda OEM Construction

The 18176-PT0-003 is a factory replacement fastener intended to match the original hardware used in designated Honda exhaust assemblies.

Unlike a generic replacement bolt, this component features a specific head, shaft, and splined shoulder configuration.

These design characteristics are important because the original mounting arrangement may depend on more than thread diameter and overall length.

Catalytic Converter & Exhaust Pipe Connection

Honda catalogs identify this component as a converter bolt or converter and pipe rear bolt.

It is used in specific exhaust assemblies where the catalytic converter connects to associated exhaust piping or mounting hardware.

The exact mounting location varies by vehicle and exhaust configuration.

Splined Shoulder Design

The bolt features a splined section between its threaded shaft and flat head.

This design is intended for the corresponding factory mounting arrangement and should not be substituted with an ordinary smooth-shank bolt without verifying compatibility.

Proper installation depends on the matching exhaust component and hardware configuration.

OEM Part Number Supersessions

Honda part number 18176-PT0-003 is listed as replacing:

• 18176-PT3-A00

• 18176-PH4-731

These supersessions help identify the appropriate replacement when servicing older exhaust assemblies.

Always verify fitment before ordering, particularly when working with a vehicle that has undergone exhaust modifications.

Exhaust Hardware Corrosion

Catalytic converter and exhaust pipe fasteners are regularly exposed to moisture, road salt, and elevated temperatures.

These conditions can lead to:

• Surface corrosion.

• Seized threads.

• Damaged bolt heads.

• Broken fasteners during removal.

• Difficulty securing replacement exhaust components.

Replacing compromised hardware during exhaust service can help prevent additional disassembly and installation problems.

OEM vs. Universal Replacement Hardware

Generic exhaust bolts may differ in their head dimensions, shoulder design, thread specifications, or mounting characteristics.

Using the correct Honda replacement part helps preserve the intended factory hardware arrangement.

For applications requiring this exact bolt, genuine Honda hardware is preferable to selecting a universal fastener based only on visual similarity.

Installation Quantity

The number of bolts required varies by vehicle and exhaust assembly.

Some Honda factory exhaust diagrams specify multiple converter bolts per connection.

This listing is for one bolt only. Check the factory parts diagram to determine the quantity required for your application.

Common Reasons for Replacement

• Rusted Exhaust Hardware: Replaces heavily corroded converter mounting bolts.

• Seized Fasteners: Provides replacement hardware when the original bolt cannot be removed without damage.

• Broken Converter Bolts: Replaces fasteners damaged during exhaust disassembly.

• Catalytic Converter Replacement: Restores factory mounting hardware during converter installation.

• Exhaust Pipe Repairs: Replaces damaged hardware at the designated pipe connection.

• Stripped Threads: Replaces bolts with damaged or unusable threads.

• Exhaust System Restoration: Helps return older Honda vehicles to factory-style specifications.

• Missing Hardware: Replaces lost or previously removed factory bolts.

• Incorrect Aftermarket Hardware: Restores the intended original fastener configuration.

• Preventative Maintenance: Replaces questionable hardware while the exhaust assembly is already disassembled.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that Honda part number 18176-PT0-003 is specified for the vehicle and exhaust connection.

2. Allow the Exhaust to Cool: Ensure the catalytic converter and exhaust piping are completely cool before beginning work.

3. Safely Support the Vehicle: Use an appropriate vehicle lift or properly rated jack stands.

4. Inspect the Existing Hardware: Check for corrosion, stripped threads, broken bolts, or damaged mounting surfaces.

5. Remove the Original Bolt: Follow the factory service procedure and use appropriate tools for seized hardware.

6. Inspect the Mounting Location: Verify that the mating component and bolt seating area are not damaged.

7. Compare the Replacement Bolt: Confirm that the head, splined shoulder, and threaded section match the required factory configuration.

8. Install the New Bolt: Position the fastener according to the Honda service manual for the specific vehicle.

9. Use Correct Matching Hardware: Install the appropriate nuts, springs, or other components specified for the exhaust connection.

10. Tighten to Factory Specifications: Follow the applicable Honda service manual for tightening procedures and torque values.

11. Inspect Exhaust Alignment: Verify that the converter and exhaust piping are correctly positioned.

12. Check for Exhaust Leaks: Inspect the connection after installation and initial engine operation.

Important: Exhaust mounting hardware can become severely corroded or seized. Avoid excessive force that could damage the catalytic converter, exhaust flange, or surrounding components. Professional installation is recommended when original hardware is heavily deteriorated.

What's Included

• (1) Genuine Honda Catalytic Converter & Exhaust Pipe Mounting Bolt – 18176-PT0-003

Note: This listing includes one OEM Honda converter bolt only. Nuts, springs, gaskets, catalytic converters, exhaust piping, and other mounting hardware are not included.

Restore your factory exhaust connection with the Genuine Honda Catalytic Converter & Exhaust Pipe Mounting Bolt (18176-PT0-003).

Designed to Honda's original equipment specifications, this replacement fastener features the factory-style threaded shaft, splined shoulder, and flat-head configuration required for compatible converter mounting applications.

Whether replacing rusted exhaust hardware, installing a replacement catalytic converter, or restoring an older Honda exhaust system, Honda 18176-PT0-003 delivers genuine OEM fitment and dependable factory-quality construction.