Learn about different types of bolts available in the market

Bolts are part of the threaded fastener family used to join two unthreaded items using a nut. Bolts, unlike screws, require a nut as well as a drilled hole into which the bolt can be put. Nuts and bolts are utilized in a wide range of industries, including building and machinery.

Bolts are a type of metal fastener consisting of a head on one end, a chamfer on the other, and a shaft with an exterior helical ridge known as a thread. Bolts are divided into many types based on their head forms, strengths, finishes, and materials. So, it is important to have the necessary knowledge of these types to choose the best bolt type for a particular project or work.

  • Anchor bolts:

These are used to lock a structural object or component to a concrete slab. Anchor bolts feature a threaded section at one end and a non-threaded L-shaped section at the other. It usually comes with a washer and a nut. They are mainly used to attach steel to concrete by embedding one end into the concrete slab or plate, while the other end is threaded to secure the structural component.

  • Stud bolts:

They feature a threaded part on each end instead of a standard single head. Generally, both ends of these bolts come with heavy hexagon nuts and are mainly used in flange connections. There are commonly available in various types, such as:

  • Fully threaded stud bolts:

    These have threads along their entire length. With nuts at each end to form a bolt, these are used to secure huge components or objects together. They can also be used to provide an adjustable element for constructions and equipment.

  • Double-end stud bolts:

    These are threaded at both ends and have a shank (non-threaded) in the center. They are also available with the shank reduced slightly than the actual diameter of the stud.

  • Welding stud bolts:

    They have nuts on one side and are welded to support or plate on the other end.

  • Flange stud bolts:

    They feature a continuous threaded body and have chamfered ends.

  • Tap end stud bolts:

    These have a non-threaded shank at the center and unequal thread lengths at the extreme ends. These tap bolts are an excellent choice if you need to fasten through a lot of material. They are common in the automotive and truck repair industries because they perform well for locking motors to machinery. Tap bolts are also helpful in regulating the tension on belts in pulleys.

  • Hex bolts:

As the name suggests, these bolts have a hexagon-shaped head that may be tightened with a wrench or socket. They are either fully threaded or may feature an unthreaded shoulder. Hex bolts, also called hexagon head bolts, are widely used in outdoor, automotive, marine, and coastal environments.

The hexagon head is easy to grip with tools from all angles and can also be gripped by hand. Because there is enough room to use your tools from all angles, it is simple to loosen and tighten them.

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  • U bolts:

They are partially threaded on both ends and bent in the shape of the letter U. Some U-bolts have a squared-off shape, whereas most have a semi-circular profile. These bolts are widely used in various applications, from supporting pipes to drive shafts and exhaust systems in automobiles.

Some U bolts have a rubber covering to prevent wear from metal against metal movement. To lessen the effect of vibration and control noise, some U bolt designs include thick rubber gaskets. Non-metallic U bolts are also available for use in situations where the bolt may come in contact with an electrically powered conductor.

  • Carriage bolts:

These are a type of self-locking bolt with a flush-mount domed head that enables smooth removal or loosening of the bolt only from the nut side without the need for a wrench. Carriage bolts have a square part under the head that can be put into a similar square cut to give the bolt's self-locking function.

  • T bolts:

They have a head that may be placed into a slot, locking the bolt in place and preventing it from loosening when the nut is tightened. T bolts are utilized in applications where accessing both ends of the fastener is not always possible, such as fastening fuel tanks in place. Usually, they are put into a channel in a T-slot track machine to secure an object along the length of the channel.

  • J bolts:

These are headless bolts with a bent profile in the shape of the letter J and are prominently used to secure pipes with a round or circular profile. Because of its open hook design, J bolts provide partial support to structural components. They are also commonly used in roofing applications and in the construction of garages and foundations.

  • Hanger bolts:

They are also sometimes called couch bolts and feature threaded regions on both ends. One end has a lag screw thread, while the other end is a machine screw thread. They are made to fit into a pre-drilled hole and are great for suspending sheet metal or electrical wiring from wooden structures. Hanger bolts are frequently used with coupling nuts and threaded rods to support suspending objects or electrical conduits.

  • Flange bolts:

These bolts include a circular washer-like flange under the head that distributes the load or clamping force. Flange bolts are best suitable for automotive applications, plumbing, and more. They are either full-threaded or partially threaded. Flange bolts that are non-serrated are known as frame bolts.

  • Lag bolts:

Also called lag screws, these bolts have a pointed head instead of the more usual blunt end seen on most bolts. This makes them appear more like a screw rather than a bolt. Lag bolts are often used for a range of home projects (indoor and outdoor works), but they are most typically utilized in the construction industry.

  • Huck bolts:

Standard bolts are usually secured with a nut. But, Huck bolts are secured with a permanent sleeve or collar that fits around a grooved pin. To swage the collar, it is inserted into a pre-drilled hole and is pressed into the grooves of the pin as it is tightened. As a result, a direct metal-to-metal bond is created that avoids transverse vibration while also providing greater tensile and shear strength.

  • Elevator bolts:

These are also called belt bolts or Norway bolts and are basically used in conveyor systems. Elevator bolts have a unified thread pitch and also feature a broad, countersunk flat head. In addition, they have a square neck and a shallow-depth conical bearing surface. To tighten an elevator bolt, you must torque the nut. A hole may be tapped into the head of an elevator bolt in some cases, mainly when it is used as a leveling leg.


This was a brief summary of some of the common types of bolts that can be utilized for various applications. Buying these bolts from a reputed supplier is the best to ensure high quality, high performance, and longer durability. Moglix is one of the most preferred online marketplaces for buying bolts from reputed manufacturers at competitive prices. You can also place bulk orders through this online portal at discounted prices.