An automotive lock nut is used in conjunction with an exhaust stud, a lock nut is just like a standard nut, but the lock nut has the added function of locking itself to the stud (thread). There are various types of lock nuts and we have pictured a few of the common ones. They each have a different way of locking to the threads.
- The copper lock nut on the left has a small section on the end which has been cut and pressed down
- The stainless steel lock nut in the middle have small sections that grab the thread
- The cone lock nut on the right has the end crushed slightly
We recommend the copper lock nut for the installation of our SINCO turbo manifolds as these have the smallest hex or spanner size which is a benefit when trying to access the nuts with spanners around turbo housings and manifold runners. For e.g - The m10 copper nuts have a spanner size of 14mm while the other two are 17mm.
The main benefit of using lock nuts is once installed the chances of it working itself loose are greatly reduced.