How should stud bolts be installed?
Stud bolts, are fasteners that have threads on both ends with an unthreaded shank in the middle. They come in various diameters, ranging from coarse to fine. Also known as double-ended screws or double-ended bolts, these fasteners are commonly used in large-scale equipment and structures such as mining machinery, bridges, automotive components, and gear reducer frames.
The dual-threaded design allows one end of the stud to be permanently installed into a tapped hole in one component, while the other end can accept a nut to join it with another component. This type of fastener is particularly useful in applications where there is limited access to one side of the joint or when a secure, permanent connection is required but still allows for periodic disassembly for maintenance or inspection.
When installing stud bolts, lubricant should be used to prevent the stud from seizing during tightening and to allow for repeated removal and reinstallation.
To ensure the secure fastening of the stud bolt's threaded end into the equipment body threads without any loosening during nut assembly and disassembly, the stud’s threaded end should employ a transition fit, providing a slight interference on the pitch diameter. This can be achieved using a shoulder structure or by having the last few threads at a shallower depth for a tighter grip. When inserting the stud bolt into a soft material body with threads, a slightly greater interference may be applied.
The axis of the stud bolts must be perpendicular to the surface of the device being installed. Attention must be paid to this during both pilot hole drilling and tapping. It is best to check this with a square during installation. If there is a slight misalignment between the axis and the surface of the body, a tap can be used to correct the threaded hole. However, if the misalignment is significant, brute force should not be used to correct it as this can damage the stud.
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