• What is Automotive exhaust self-locking copper nut?

A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, stiff nut or elastic stop nut, is a nut that resists loosening under vibrations and torque. An automotive exhaust manifold copper 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. 

• What is Automotive exhaust self-locking copper nut for? 

A exhaust manifold is subject to high heat which is generated from the engine cylinder. The heat along with vibration from a high revving engine where nuts expand from the heat and loose. A copper lock nut is useful when mounting a manifold to engine cylinder head. 

• The feature of Automotive exhaust self-locking copper nut.

The nut is strongly copper-plated and is therefore suitable in areas of extreme heat eg. exhaust manifolds. Suitable for temperatures from -70 to 400 degrees centigrade.