These 10mm hex head nuts have a 4.5mm tapped hole designed for M6 bolts. The thread forms as they are wound on and can be used multiple times. The underside is bevelled to help seal the thread. They have a 16mm ring to act as a washer, sloped top and a height of 11mm (ring height 3mm) as per the original products. By their very nature they are a tight fit and therefore act in a self-locking manner. These are commonly used to secure the battery box and utility boxes in the rear of various European car brands including BMW, SAAB, VOLVO, MERCEDES etc. They can also be found to secure body parts and trim pieces, lambda sensors and other car accessories that would be damaged or inappropriate for metal nuts.
