Button Head Bolt
Also known as a dome head, socket button head or flat undercut head, this style of fastener has a low domed profile that allows for a wide load-bearing surface. Its appearance is popular for aesthetic reasons and its design allows the screw to withstand greater torque than other types of socket head cap screws because it distributes force more evenly across its large face. It’s a great choice for applications where the head may need to resist shear loads and compression forces, such as in brake pedals, stamping die rails or stripper bolts on printing presses.
Button head socket cap screws, like all socket screw varieties, are high-strength fasteners that require an internal hex drive for installation. They’re used in a variety of industrial and commercial applications including furniture, electrical equipment, hand tools and appliances, metal fabrication, and machinery assembly. The rounded head makes these fasteners less likely to snag clothing or other items on moving equipment, and their deep hex recess can be gripped by hand, preventing it from backing off.
These fasteners are typically manufactured from alloy or stainless steel and meet specifications outlined by ASME B18.3 or DIN 7380 and are available in various finishes, such as black oxide and oil, mechanical zinc and zinc-bake Cr+3. They’re designed for light fastening applications and can withstand shear loads as well as compressive stresses. These bolts are often installed with a washer and a lock nut to help resist loosening or vibration and can be used in conjunction with a wrench for tightening or loosening. Button Head Bolt