Cup Head Bolts are often used to secure pieces of timber together. They are commonly used in chain link fences, decks and flat-packed furniture. They are useful for applications where the head of the bolt is not easily accessible. Cup Head Bolts are available in a range of metric sizes in gal and stainless steel.
A cup head bolt, also known as a carriage bolt or coach bolt, has a domed head and a square neck which makes the bolt self-locking. It is used through an iron strengthening plate on wither side of a wooden beam, the squared part of the bolt fitting into a square hole in the ironwork. It is also common to use directly into bare timber as the square section gives enough grip to prevent rotation.