When it comes to using a Class 8 steel bolt with a Class 10 nut, it is generally recommended to match the grade of the nut with the grade of the bolt for optimal performance and safety.
The appropriate grade of nut should always be matched to the bolt grade.
For example, if you have a Class 8 steel bolt, it is recommended to use a Class 8 nut.
Using a lower grade nut, such as a mild steel nut, with a higher grade bolt, such as a Class 10 bolt, may compromise the performance and integrity of the fastening system.
The strength of the nut should be compatible with the strength of the bolt to ensure proper load-bearing capacity and resistance to failure.
It's important to note that the grade of a bolt is typically marked on the head of the bolt, while the grade of a nut may be marked differently depending on the system used.
For example, in the SAE International system, the strength level of a nut can be determined by the markings on the nut, which are similar to the lines on the head of a bolt.
In other systems, such as the ISO or ANSI standards, nuts of a higher property class can usually be used in place of nuts of a lower property class.
In summary, it is recommended to use a nut of the same or higher grade as the bolt to ensure compatibility and optimal performance.