Carriage bolt file

Carriage Bolt: Round Head, Short Neck Properties Description A round head bolt with a short, square shoulder under the head, and a unified thread pitch. The bolt is made from low or medium carbon steel Applications Designed to keep the bolt from turning when a nut is being tightened.

The short neck is used with sheet metal where a standard size neck would create an obstruction. Yield Strength 36, psi min. Applications For use in soft, ductile metals, wood and plastics to keep the bolt from turning when the nut is being tightened.

Material Carbon Steel - Carbon:. Where the bearing surface and shank meet are two fins, degrees opposite each other. The bolt is made from low carbon steel. Applications For use in thin plywood to keep the bolt from turning when nut is being tightened.

Although flat, the head has a measurable side height causing it to protrude above its mating surface when it is completely tightened. Directly below the head is a square neck and a threaded section that has a unified thread pitch. Applications The square neck design keeps the bolt from turning as a nut is tightened.

The flat head feature gives a lower profile on the front or top side of the fastening than a round head carriage bolt. Designed specifically, but not exclusively for the garage door industry. Plating Flat head carriage bolts are usually supplied with a clear zinc finish. Additional Resources. Basic Bolt Diameter Click on the size to shop products. Body Diameter E. Head Diameter A. Head Height H. Square Width O. Square Depth P. Nominal Bolt Size.

Up to 1". Over 4" - 6". Carriage bolts most commonly have a smooth, domed head with a square section underneath that pulls into the material to prevent spinning during installation.

This feature allows for the bolt to be self-locking when installed through a square hole in a metal strap, or a round hole in most woods. It can be installed with a spanner or wrench. Depending on your application, we supply a wide array of materials and grades, such as hot dipped galvanized carriage bolts commonly used for outdoor furniture because of the thicker protective coating, Grade-5 and Grade-8 carriage bolts for greater load carrying capacity, or stainless steel carriage bolts for greater corrosion resistance.

This allows the fastener to be installed with only a single tool, a spanner or wrench, working from one side. The head of a carriage bolt is usually a shallow dome. The squared section is of the same size as the diameter of the bolt shank, with a plain unthreaded shank.

Carriage bolts were developed for use through iron strengthening plates on either side of a wooden beam. It is commonplace though to use them to bare timber, the squared section giving enough grip to prevent rotation. Carriage bolts are extensively used in security fixings, such as the Brenton Bolt where the bolt must only be removable from one side.

The smooth domed head and square nut below prevent the carriage bolt from being unlocked from the insecure side. Closely related to carriage bolts are timber bolts , meant for use with large wood planks and structures. They have a domed head that is proportionally wider than that of a carriage bolt, and instead of a square section of shank under the head, they have four sharp-cornered fillets that grip the edge of the hole in the wood to prevent rotation.

They are also known as mushroom head bolts or dome head bolts. They are used to fasten wood to wood, instead of metal to wood. Plough bolts are a flush-fitting carriage bolt, where the head is countersunk beneath the surface.