A shoulder bolt is generally understood to be a type of fastener with a shank partially threaded and having a smooth, cylindrical section called a shoulder. This shoulder can extend beyond the thread and provides an axis of rotation or precision alignment for moving parts that could operate pivotally. These shoulder bolts, therefore, could do two jobs properly: one is the fastening, a... https://www.dalloyedbolts.com/shoulder-bolts-manufacturers-suppliers-stockists-exporters.html