​​​One of the biggest mistakes in automotive work, is using the wrong kind of bolt. All automotive manufacturers use grade 8 or higher nuts and bolts on their vehicles. There are many that do not understand bolts by grade and torque specifications. Don't make the mistake thinking that a bolt is a bolt, because they aren't.

I have seen engine brackets break or even rear trailer hitches break off from using the wrong bolts. It is even more common with shock absorbers. I have seen many of shocks come loose because an inferior bolt was used. I have seen head gaskets blow out because a low grade bolt was used to replace a missing factory one. Lower grade bolts can't ​with​stand the torque that higher grades can.

All heads of bolts, have markings and indicators to specify the grade of the bolt. ​It is crucial to use the right kind of bolt per application. Always pay close attention to the head of a bolt to ensure it is the right strength bolt.