The metric button socket cap screw has a similar thread design as a metric socket cap screw, but is fully threaded to the head. The dome shaped head is wider and has a lower profile than a socket cap screw. It is often used when a wider bearing surface or a smoother, more finished appearance is desired, or in material too thin to accommodate a countersunk head. Button head cap screws do not afford the strength of socket head cap screws, and are designed for light fastening applications.
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