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Mushroom Head Square Neck Carriage Bolts
Properties
- Forming: Hot & Cold Forged
- Material: Carbon Steel, Stainless Steel
- Grade: 4.8/6.8/8.8/10.9/12.9
- Standards: ASME, BS, DIN, ISO, UNI, DIN-EN
Applications
- Construction Industry
- Energy Industry
- Automotive Industry
- Transportation Industry
- Machinery And Tool Industry
Customization
OEM, ODM
A carriage bolt (also called coach bolt and round-head square-neck bolt) is a form of bolt used to fasten metal to metal or, more commonly, wood to metal. Also known as a cup head bolt in Australia and New Zealand.
It is distinguished from other bolts by its shallow mushroom head and the fact that the cross-section of the shank, though circular for most of its length (as in other kinds of bolt), is square immediately beneath the head. This makes the bolt self-locking when it is placed through a square hole in a metal strap.
The carriage bolt was devised for use through an iron strengthening plate on either side of a wooden beam, the squared part of the bolt fitting into a square hole in the ironwork. It is common to use a carriage bolt on bare timber, the square section giving enough grip to prevent rotation.
The carriage bolt is used extensively in security applications, such as locks and hinges, where the bolt must be removable from one side only. The smooth, domed head and square nut below prevent the carriage bolt from being gripped and rotated from the insecure side.
