A Button Head Bolt is a fastener with a wide load bearing surface that resists loosening. These are used in applications such as car mounting, suspension components and electrical equipment where a finished appearance is important. These fasteners are also a good choice where other types of screws could snag on protective clothing, harnesses or moving machinery parts.

The raised dome head provides a finished appearance and helps to prevent damage or tripping. The wide loading surface of the head is also a key feature, as it helps to resist loosening caused by vibration or movement. These features make these fasteners ideal for heavy-duty tasks and applications in which looseness would cause a serious problem.

These fasteners have a deep socket recess and thick side walls, which makes them stronger than traditional socket cap screws. They also have a higher preload rating than standard hex head cap screws.

Socket shoulder screws have a shear component and are precision-ground and heat treated to support the loads applied to them. These are typically found on brake pedals, stamping die rails and stripper plates on printing presses.

These screws are typically driven with a wrench or hex key. The socket shoulders slope at an 82-degree angle (imperial) or around 90 degrees (metric) to provide the highest load-bearing area possible. These are often used in applications where a flat head is not desirable for aesthetic reasons, or when the material is too thin to countersink the screw.   Button Head Bolt