Basic types of threaded connections
1. Bolt connection
Bolt connection is to pass bolts through the holes of the connected parts, and then tighten the nuts to connect the connected parts. Bolt connections are divided into ordinary bolt connections and matching bolt connections. In the former, there is a gap between the bolt rod and the hole wall, while in the latter, there is no gap between the bolt rod and the hole wall, and the basic hole system is often used as a transition fit.
Bolt connections do not require threaded holes to be cut on the connected parts, so they are simple in structure, easy to assemble and disassemble, and are widely used. This kind of connection is generally used when the connected part is not too thick and can be assembled from both sides of the connected part.
2. Double-ended stud connection
Double-ended stud connection is to screw one end of the double-ended stud into the threaded hole of one of the connected parts, and pass the other end through it
Left the through holes of the connected parts, and then tighten the nuts to connect the connected parts. This type of connection is generally used when one of the connected parts is too thick to be connected by bolts or when the connection structure is desired to be compact and requires frequent assembly and disassembly.
3. Screw connection
Screw connection is to pass the screw through the through hole of one connected part and then screw it into the threaded hole of the other connected part. This type of connection does not require nuts and has a smooth exposed surface. It is suitable for situations where one of the connected parts is too thick and is not frequently assembled and disassembled.
4. Set screw connection
Set screw connection is to screw the set screw into the threaded hole of one of the connected parts, and use its end to push against the surface of the other connected part or push into the corresponding dimples to fix the relative position of the two parts. This kind of connection is mostly used to connect shafts and parts on the shaft, and can transmit small loads.
Threaded connectors
Threaded connectors include bolts, studs, screws, set screws, nuts, washers, anti-loosening parts, etc. Most of them are standard parts. The structure and dimensions are specified in national standards. Their nominal dimensions are the thread major diameter d, which should be selected according to standards during design.