Hex bolts can be used either in pre-tapped holes or with nuts, depending on the application. They can then be tightened using a range of tools including a hex bolt wrench, socket sets, spanners, hex keys, and ratchet spanners.
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The hexagon-shaped head ensures that it is easy to grip hex bolts from multiple angles, using different types of tool. This makes their installation and removal a straightforward process, plus ensuring it is also easy to loosen or tighten hex bolts once they are in situ.
The thread of a hex head bolt, also known as the screw thread, is the helical structure which comprises the main body of the bolt. It uses rotational force to drive the bolt firmly and securely into place, helping to provide easier entrance and exit into the material whilst also providing added grip. Both fully-threaded and partially-threaded hex bolts are available.
Partially-threaded hex bolts are only threaded from partway down the bolt’s length to the end. An unthreaded shank (also known as grip length) joins the threaded shank and the head. Partially-threaded bolts provide strong levels of resistance. Strain on the unthreaded part of the shank is prevented by the design which ensures that section has no weak spots.
Fully-threaded hex bolts are threaded from the end of the bolt right up to the head. They are ideal for use in heavy-duty fastening applications and are best suited to installation in pre-threaded holes. Properly installed fully-threaded hex bolts are designed to spread the pressure across the full length of the bolt, providing a greater level of strength than partially-threaded alternatives.
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Hex bolts are typically manufactured from steel or stainless steel. While some manufacturers offer hexagonal bolts made from other materials, steel and stainless steel hex bolts are the norm.
Additionally, different coatings and finishes are available. These provide various qualities and appearances in order to suit a wide range of applications.
Popular hex bolt finishes include:
You may also find hex bolts made from other materials like brass, but this is less common. Although brass provides a high level of resistance against corrosion, it is usually more expensive so is often overlooked in favour of steel.
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