A Button Head Cap Screw is a high strength fastener with a rounded head and internal hex drive. They have a larger surface area than traditional socket head cap screws and can distribute force more evenly. They are typically made of steel with a corrosion resistant coating and are used in applications requiring a more robust fastener. They are also available in a variety of head shapes, threading options and custom features.

There are many factors to consider when selecting the right type of screw for your project. Button head cap screws are often preferred for projects requiring a flush finish or limited clearance. However, they may not be the best option if you need increased strength or durability. Hex bolts are a better choice for heavy duty applications.

Socket Shoulder Screws
A socket shoulder screw is a bolt with a flat, socket-shaped head that sits in a countersunk hole in the material being fastened. The shoulder slopes at about 82 degrees (imperial) or 90 degrees (metric) and helps resist rotational movement, lateral movement, vibration, and loosening from torsional loads. They are used in a wide range of applications, including tool and die castings, machine assemblies, stationary guides, pulley shafts, and moving shafts.

Socket Shoulder Screws are also known as a flat head socket screw or a hex socket shoulder screw. They are a good choice when an appearance-oriented design is desired, or the clamping material is too thin to countersink. Their rounded head profile provides a smooth finish and reduces the risk of snag injuries from protruding screw heads that could catch skin, clothing or equipment.