A shoulder bolt, also known as a shoulder screw or stripper bolt, is a type of fastener that has a cylindrical shoulder between its head and threaded portion. The shoulder is a larger diameter than the threaded section, providing a smooth transition and acting as a bearing surface.

These bolts are often used in applications where precise spacing or alignment is crucial. The unthreaded shoulder allows for rotational movement when installed, while the threaded portion secures the bolt in place. The shoulder also provides a larger load-bearing surface, which can be beneficial in certain applications.

Shoulder bolts are commonly used in machinery, equipment manufacturing, and various mechanical assemblies. They come in various materials, including steel, stainless steel, and brass, depending on the application’s requirements. The shoulder length, diameter, and thread size can be specified based on the specific needs of the project.