Exhaust hexagon nut. Porsche 996 / 997  ❭  90038000501

Exhaust hexagon nut. M8 zinc plated. Self locking.
An OE Match exhaust hexagon nut (M8 size) designed as a self-locking fastener for securing exhaust system components on Porsche 996 and 997 models. 
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Fits:
Porsche 996 C2 / C4 / C4S 1998 - 1905
Porsche 996 GT3 2000 - 2005
Porsche 997 C2 / C4 / C2S / C4S 2005 - 2008

Diagram ref no 16

This hexagon nut secures exhaust system components in place, maintaining tight connections and preventing loosening caused by heat cycles and vibration.

Function

• Secures exhaust components and mounting points
• Provides a self-locking, vibration-resistant fit
• Maintains tight clamping force under heat stress
• Resists corrosion and environmental exposure
• Ensures safe and stable exhaust system assembly

Exhaust fasteners are exposed to extreme heat cycles and corrosion, which can cause nuts to seize, degrade, or lose their locking ability. This can result in exhaust leaks, loose components, or difficulty during removal. Replacing worn or damaged nuts ensures secure fastening, prevents exhaust system issues, and simplifies future maintenance.

When to replace
•  During exhaust repairs or replacement
•  Nut is corroded, seized, or rounded
•  Loss of locking function or clamping strength
•  Evidence of exhaust leaks at joints
•  As part of preventative maintenance

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90038000501

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