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This 5-piece pack of Connect M8 self-locking flanged nuts is designed for automotive exhaust manifold studs, offering enhanced vibration resistance and high-temperature suitability. While its full metal construction and copper flashing provide excellent anti-seize properties for demanding applications, users should verify thread pitch compatibility for their specific vehicle models.
| Colour | Copper |
|---|---|
| Model Part Number | 30742 |
| Brand | Connect |
The nuts have a slightly oval shape which creates interference with the bolt threads. This interference provides resistance to loosening caused by vibration or thermal changes, acting like a prevailing torque locknut.
The copper flashing provides an anti-seize coating. This is particularly important for exhaust components which experience high temperatures, preventing the nut from seizing onto the stud and making future removal easier.
The flange acts as a built-in washer. It distributes the clamping load over a larger surface area of the mating component, reducing the risk of damage and improving the overall stability of the connection.
These nuts are specifically designed for M8 x 1.25 thread pitch studs and their intended high-temperature application. While they might physically thread onto other M8 x 1.25 bolts, their self-locking and high-temperature properties are best utilized in their intended use case.
The MPN (Manufacturer Part Number) for this product is 30742.
Yes, these self-locking nuts are generally reusable. However, their effectiveness may decrease with each subsequent installation, particularly the prevailing torque from the self-locking feature. Inspect them for damage before each use.
The hex size for these nuts is 10mm.
Verify that the stud has an M8 x 1.25 thread pitch. Check for any damage or debris on both the stud and the nut's internal threads. Ensure you are not trying to thread it onto a stud with a different thread size or pitch.
Ensure the nut is fully seated and tightened with a 10mm hex socket. Check if the stud is damaged or if the nut's self-locking feature is compromised by cross-threading or excessive force during installation.
The copper flashing is designed to prevent seizure. If the nut is extremely difficult to remove, ensure you are using the correct size wrench (10mm hex) and applying steady force. Penetrating oil may help if rust has formed, although the copper plating should minimize this.
Setup:
Compatibility:
Care:
Due to their high-temperature and anti-seize properties, these nuts require minimal special care. Inspect them for any signs of damage or excessive wear before installation. The copper flashing is designed to wear over time with repeated use; if significant wear is observed, reapplication of a high-temperature anti-seize compound may be considered for future installations, though the self-locking feature should still provide some resistance.
