Button Head Bolt:

A button head Bolt socket cap screw is a type of cap screw with a cylindrical head and hexagonal drive hole. Whereas a button head socket cap screw is most commonly driven with an allen wrench or hex key. Moreover button socket cap screws feature clean heads with no stamping or marking for a nice clean finished look. While Socket Head Cap Screws, which are also known as Allen head screws are stock items at Lightning Bolt in many materials sizes. .There are a wide variety of Socket Head Cap Screws. Most Socket Head Cap Screws are designed with a small head, followed by a smooth rod, and then threaded to the end of the screw.

General:

A button head socket cap screw is a type of cap screw with a cylindrical head and hexagonal drive hole. A button head socket cap screw is most commonly driven with an allen wrench or hex key. Most button socket cap screws feature clean heads with no stamping or marking for a nice clean finished look. Socket button head machine screws with hexagonal recess, driven using a hex wrench or insert bit.

Black–oxide alloy steel screws are mildly corrosion resistant in dry environments.

Zinc–plated alloy steel screws resist corrosion in wet environments.