Dome Head Grade 5 Carriage Bolts, Shipping Weight: 2.75lbs
A carriage bolt or coach bolt has a rounded, dome or countersunk head with a square neck whick keeps the bolt from turning once it’s been tightened into place. Commonly used in building, timber and flooring. A carriage bolt should be inserted into a pre-drilled hole and tightened with a nut.
Bolt pictures are a general representation and not an actual picture of the product you will receive. Threads will vary according to the individual bolt sizes and dimensions. ISO standards for threads are: length is twice the diameter of the bolt plus ½ inch.
Bolts use a wide variety of head designs, as do screws. These are designed to engage with the tool used to tighten them. Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end.
Common bolt heads include hex, slotted hex washer, and socket cap.
The first bolts had square heads, formed by forging. These are still found, although much more common today is the hexagonal head. These are held and turned by a spanner or wrench, of which there are many forms. Most are held from the side, some from in-line with the bolt. Other bolts have T-heads and slotted heads. Button Socket Cap Screws Fine Plain Bolts
Many screws use a screwdriver head fitting, rather than an external wrench. Screwdrivers are applied in-line with the fastener, rather than from the side. These are smaller than most wrench heads and cannot usually apply the same amount of torque. It is sometimes assumed that screwdriver heads imply a screw and wrenches imply a bolt, although this is incorrect. Coach screws are large square-headed screws with a tapered wood screw thread, used for attaching ironwork to timber.
Head designs that overlap both are the Allen or Torx heads; hexagonal or splined sockets. These modern designs span a large range of sizes and can carry a considerable torque.
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