Shoulder Bolt

The screw’s head, which has the greatest diameter part and serves as both a bearing surface and a drive mechanism (slotted, hex, etc.) for installing it, prohibits the screw from being inserted any further than its length. The center, smooth region of the screw called the shoulder is where the workpieces’ lateral movement is contained. The threaded portion contains helixed grooves with a main diameter that is only marginally smaller than the shoulder diameter. This section is for insertion into a matching thread, such as a nut or tapped hole.  The shoulder allows for controlled rotation or sliding of attached parts while maintaining alignment. Shoulder bolts are used in various applications where precise movement and secure attachment are needed, such as in machinery, automotive, and aerospace industries. The shoulder allows for rotation of one part while another part is fixed to the threaded portion.