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Exhaust Nuts / Bolts / Studs
By OE Match
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 924 2.0L 1976-79
- Porsche 914 (1970-1976)
Heat Exchanger Hexagon Nut – M10
Sold each
Ensure a secure and reliable exhaust installation with this Heat Exchanger Hexagon Nut. Manufactured to original equipment specifications, this high-quality
replacement hexagon nut is used to securely fasten the heat exchanger to the
engine's exhaust studs, ensuring a tight, leak-free connection.
Fits:
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 924 2.0L 1976-79
- Porsche 914 (1970-1976)
Diagram ref no 7
Heat exchanger mounting hardware is continually exposed to extreme exhaust temperatures, moisture, road salt and vibration. Over time, the original nuts can corrode, seize or lose their clamping force, making removal difficult and increasing the risk of exhaust leaks. Replacing worn or damaged hardware whenever the exhaust system is removed is considered best practice for both servicing and restoration work.
Manufactured from durable, corrosion-resistant materials, this OE Match hexagon nut provides dependable clamping force and long service life, making it ideal for routine maintenance, exhaust repairs and concours restorations.
What Does the Heat Exchanger Hexagon Nut Do?
The hexagon nut secures the heat exchanger to the cylinder head via the exhaust studs.
Its primary functions include:
- Securing the heat exchanger firmly in position.
- Maintaining correct gasket compression.
- Preventing exhaust gas leaks.
- Resisting loosening caused by vibration and heat cycling.
- Supporting proper exhaust alignment.
- Helping maintain engine performance and efficiency.
Correctly tightened exhaust hardware is essential for a safe and reliable exhaust system.
Why Should the Heat Exchanger Nut Be Replaced?
Exhaust mounting hardware operates under extremely demanding conditions.
Common reasons for replacement include:
- Corrosion caused by moisture and road salt.
- Heat cycling leading to material fatigue.
- Seized or rounded nuts during removal.
- Damaged threads.
- Reduced clamping force.
- Exhaust system restoration.
- Heat exchanger replacement.
Replacing the hardware during exhaust work helps avoid future maintenance issues and ensures a secure installation.
Symptoms of Worn or Damaged Exhaust Hardware
Typical signs include:
- Rusted or heavily corroded nuts.
- Seized fixings.
- Exhaust leaks.
- Loose heat exchanger.
- Rattling exhaust components.
- Broken or damaged fasteners.
- Difficulty removing existing hardware.
Renewing the mounting hardware helps restore the integrity of the complete exhaust system.
When Should the Heat Exchanger Hexagon Nut Be Replaced?
Replacement is recommended whenever:
- Heat exchangers are removed.
- Exhaust gaskets are replaced.
- Exhaust manifold repairs are carried out.
- Engine rebuilds are performed.
- Restoring a classic Porsche.
- Existing nuts show signs of corrosion or damage.
Installing new hardware during reassembly helps ensure reliable sealing and long-term durability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99908400202
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 924 2.0L 1976-79
- Porsche 914 (1970-1976)
Fits:
Porsche 911 1969 - 1977
Porsche 914-6 1970 - 1976
Porsche 924 1976 - 1979
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90007514803
The product you are viewing cross references to these numbers
OEMatch Exhaust Nuts / Bolts / Studs — Flow, Response, Refinement
OEMatch Exhaust Nuts / Bolts / Studs provide robust fasteners for Porsche models to help maintain secure joints and consistent exhaust flow during routine use and higher-load driving. Many owners search for genuine or OEM exhaust nuts, bolts and studs; these are direct-fit alternatives designed to match the original form, fit and function. These fasteners are selected for heat and vibration resistance while keeping routine servicing straightforward.
Available Types
- Hex flange bolts for manifold and flange connections
- Threaded studs with matching nuts for high-temperature joints
- Corrosion-resistant nuts with locking washers and heat-resistant coatings
Understanding OEMatch Exhaust Nuts / Bolts / Studs
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original exhaust nuts, bolts and studs.
OE (Original Equipment) refers to parts matching original specifications for the exhaust nuts, bolts and studs and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM exhaust nuts, bolts and studs engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
OEMatch also offers a wide selection of Porsche components, cataloguing over 4,000 individual part numbers and more than 8,700 cross-references while developing additional lines to support maintenance and repair across Porsche generations.
Benefits Include
- Restores and maintains secure exhaust joints to prevent leaks
- Reduces vibration, rattling and movement under thermal cycling
- Improves serviceability with standard thread sizes and corrosion-resistant finishes
Why Exhaust Nuts / Bolts / Studs Wear and Fail
- Corrosion from moisture, road salt and exhaust condensates
- Thermal expansion and contraction leading to loosening or fatigue
- Over-torquing, cross-threading or mechanical damage during servicing
The Importance of Replacing with OEMatch Exhaust Nuts / Bolts / Studs
OEMatch exhaust components are compatible replacements engineered to original-spec dimensions and tolerances — a practical option when genuine or OEM parts are unavailable. Correct fasteners preserve exhaust sealing, maintain correct alignment of manifolds and pipes, and help protect sensors and downstream emissions equipment. Replacing degraded hardware reduces the risk of leaks, unwanted noise and component damage while supporting reliable performance for Porsche models.
Advantages
- Materials and coatings selected for heat and corrosion resistance
- Thread profiles and lengths aligned to original specifications where applicable
- Standard sizes and finishes to simplify maintenance and reduce the risk of seizing
