What is a "shoulder bolt"?

A "shoulder bolt" is characterized by its unique design, which includes a plain, unthreaded shoulder portion that serves a specific function. This shoulder creates a pivot point, allowing components to rotate or pivot around it. The presence of the shoulder ensures that the bolt can provide both axial and radial support, making it ideal for applications that require precise movement, such as in machinery or mechanical assemblies.

Beyond the basic definition, the design of a shoulder bolt allows for greater load distribution and stability in the assembly, contributing to smoother operation and effectiveness in functioning components. This feature distinguishes it from other types of bolts that might not possess a shoulder or pivot capability. In contexts where pivoting or rotating mechanisms are essential, shoulder bolts are often the preferred choice due to their specialized design.