The specifications of stud bolts are mainly determined by core parameters such as thread diameter, pitch, total bolt length and thread coverage length. The following are the basic concepts and related knowledge about stud bolt specifications for reference in selection.
1. Thread Diameter: Also known as nominal diameter, it refers to the major diameter of the thread (outer circle diameter), which is one of the core parameters of stud bolt specifications, usually in millimeters (mm).
2. Pitch: It refers to the axial distance between the crests of two adjacent threads. For coarse threads, the pitch is the standard default value; for fine threads, the pitch is smaller than that of coarse threads with the same diameter.
3. Total Bolt Length: The total length of a stud bolt usually refers to the total length between the tops of the threads at both ends, including the thread parts at both ends and the smooth shank in the middle, in millimeters (mm).
4. Thread Coverage Length: It refers to the total length of the threaded part on the stud bolt, which is usually divided into the thread lengths at both ends. Equal or unequal thread lengths can be selected according to connection requirements.
When selecting stud bolts, it is necessary to choose appropriate specifications according to the hole diameter of the connecting parts, load-bearing requirements and service scenarios. For example, if the hole diameter of the connecting part is large, a stud bolt with a larger corresponding nominal diameter should be selected; if it is necessary to bear a large tensile force, a stud bolt with a higher strength grade and appropriate pitch should be selected.
In addition, the specifications of stud bolts are usually marked on the smooth shank or thread end of the bolt. The marking format is such as M6×40, where M represents metric thread, 6 represents the nominal thread diameter of 6mm, and 40 represents the total length of the bolt of 40mm.
