High strength fastener features
High strength fasteners are class 8.8, Class 9.8, class 10.9, class 12.9 fasteners. High strength fasteners are characterized by high hardness, good tensile performance, good mechanical performance, high connection stiffness, good seismic performance, and easy and fast construction.

High strength fasteners are commonly made of materials

SCM435 and 1045ACR 10B38 40Cr can do 10.9 and 12.9 levels. Generally, SCM435 market can do more than 10.9 and 12.9 levels.

1. Bolts: A class of fasteners consisting of two parts, the head and the screw (cylinder with external thread), which shall be matched with the nut for fastening and connecting two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

2. Stud: A class of fasteners without a head and having only external threads at both ends. When connected, one end of the large auger wire must be screwed into the part with the internal threaded hole, and the other end through the part with the through hole, the large auger wire must then be screwed into the nut, even if the two parts are fastened together as a whole. This type of connection is called a stud connection and is also a detachable connection. Mainly used for one of the connected parts with large thickness, compact structure, or because of frequent disassembly, not suitable for bolted connection occasions.

3. Screws: It is also a type of fastener composed of head and screw. According to the purpose, it can be divided into three types: machine screws, fixing screws and special purpose screws. The machine screw is mainly used for a part with a fixed thread hole, and the fastening connection between the part with a through hole does not need the nut fit (this type of connection is called screw connection and also belongs to detachable connection; It can also be fitted with a nut for fastening between two parts with through holes. The setting screw is mainly used to fix the relative position between two parts. Special purpose screws such as ring screws for lifting parts.

4. Nuts: with holes with internal threads, usually in the shape of a flat hexagonal column, but also in the shape of a flat square column or flat cylinder, with bolts, studs or machine screws, used for fastening and connecting two parts so that they become a whole.