Types of Bolt

What is a Bolt.. ?

A bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut. A Nut bolt provides us a temporary joint

 Types of Bolts

There are variety of bolts available as per our application, lets discuss some of them.

 

1. Hex bolt

Hex bolts from ITA Fasteners are mostly used in repair and construction work. As the name implies, they have a hexagonal head and come with machine threads for a firm and rough handling. They come in a wide range of different hex bolt sizes for custom applications depending on its dimensional requirements. These Hex Bolts come in the anti-corrosion stainless steel, alloy steel and carbon steel materials which ensures that the structure doesn’t weaken because of rust. Depending on the length of the bolt, it can come with standard threading or full threading. 

2. Anchor bolt

 

 

Anchor bolts are used to connect structural and non-structural elements to concrete.  The Anchor bolt consists of anchor fasteners, steel plates, or stiffeners, an inside pin and a nut. Anchor bolts transfer different types of force like tension forces and shear forces.

3. Carriage bolt

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 metal to wood.

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 is square immediately beneath the head. This makes the bolt self-locking when it is placed through a square hole in a metal strap. This allows the fastener to be installed with only one tool, a spanner or wrench, working from one side. The head of a carriage bolt usually is a shallow dome. The shank has no threads; and its diameter equals the side of the square cross-section.

4. Sex bolt

 

A sex bolt, also known as a barrel nut, barrel bolt, binding barrel, Chicago screw, post and screw or connector bolt is a type of fastener that has a barrel-shaped flange and protruding boss that is internally threaded. The boss sits within the components being fastened, the flange provides the bearing surface. The sex bolt and accompanying machine screw sit flush on either side of the surfaces being fastened. It is normally chosen because of its low profile compared to other nuts. The sex bolt often has a built-in feature, such as a slot, to aid in tightening the fastener

5. Elevator bolt

Elevator bolts are often used with canvas or other soft, pliable materials. The large diameter, flat countersunk head keeps them from pulling through the material. Also known as belt bolts, elevator bolts are also known for a shallow, conical bearing surface, an integrally-formed square neck under the head and a unified thread pitch.

A common application for elevator bolts is industrial or agricultural belting systems or conveyor systems, where head clearances must be minimal and where a wide thin bearing surface is desired. Similar to the carriage bolt, the elevator bolt's square shoulder under head prevents turning when nut is applied.

 

 

6. Flange bolt

 

Flange bolts have a circular flange under the head that acts like a washer to distribute the load. Flange bolts that are non-serrated are sometimes called frame bolts.

7. Allen bolt

 A bolt with a hexagonal socket in its head that is designed to be used with an Allen keys are called Allen bolt. The allen bolts comes with different sizes based on the requirement, Usually it has matrix thread. Allen bolt can be full threaded or half threaded based on the purpose.

8. Countersunk bolt

A countersunk bolt is a bolt that is “sunk” into a piece of lumber. The head will sit below the surface of the material and it can easily be filled with a wood plug or filler. The countersunk bolts are used where the projection of bolt head is unacceptable.

9. Hanger bolt

Hanger bolts are studs used to suspend objects from or attach items to wood. Like a typical stud, they are headless, double-ended bolts that have threads at each end. The hanger bolts generally have lag threads to screw into wood but, at the other end, machine screw threads to accept a nut or thread into an internally threaded (tapped) hole. Coupling nuts and threaded rod are often used with hanger bolts to suspend electrical conduits, junction/pull boxes, fixtures and sheet metal. The furniture industry uses them with corner brackets, clinch nut plates, tee nuts and whenever wood and machine screw threads are needed in a single fastener. Hanger bolts are also known as: couch bolts, headless hanger bolts, hanger screws.

 

10. Huck bolt

Huck bolts are a pin and collar combo that are swaged together. In the initial stages of the installation process, the Huck gun engages and pulls on the pin, whilst the nose assembly is forced down the collar. Progressively the tool swages the collar which is softer steel than pin into the grooves of the harder steel pin.

The squeezing action reduces the diameter of the collar whilst increases its length. This in turn stretches the pin generating a clamp force over the joint.

11. J Bolt

J-bolts are J-shaped fasteners, threaded on the flat side. They are often used in structural applications like securing walls to concrete foundations. The bent end hooks around rebar for support, and may be cast in concrete for use as an anchor bolt.

12. Lag bolt

The name lag screw derives from their original use in securing barrel staves, also known as lags. A lag screw requires a hole drilled at the same diameter as the shaft of the screw, a gimlet point helps pull the screw into the hole and tap its thread.

lag screws are some of the toughest fasteners. These extremely sturdy fasteners are usually used to connect heavy lumber or other heavy materials that are bearing an intense load.

13. Machine bolt

A machine bolts are metal rod with a usually square or hexagonal wrench head at one end and threads at the other that is commonly available in a size range from ¹/₄ inch to 3 inches in diameter.

14. Plow bolt

A plow bolt is a type of fastener that is used for making mechanical connections that require a smooth, or flush, surface at the location where the bolt head protrudes. These were so named because of their early use in the manufacture of plows. Today plow bolts are used on many types of heavy construction equipment, such as snowplows, road graders, and scoop shovels. Plow bolts are normally exposed to high forces and wear, and it is important to select the right bolt for each individual application.

15. Square head bolt

The bolt with the square shape head is called square head bolt. Square bolts are now most commonly used for aesthetic purposes to provide a rustic look in a new structure or to match existing fasteners in an older structure.

16. Stud

A straight rod having complete thread or thread in both end is called stud. They are designed to be used in tension. Threaded rod in bar stock form is often called all-thread.

17. T Head bolt

T-Head Bolts, otherwise known as Hammer-Head Bolts, are used in a range of applications – such as the fastening of lift guide rails. They are able to be placed flexibly in required positions within anchor channels.

18. Timber bolt

Timber bolts, also known as mushroom head bolts or dome head bolts, can be used in both marine and wood applications. The underside of the oversized, rounded bolt head has nubs or fins which prevent the bolt from turning in the timber (usually between two and four nubs). The oversized head of the timber bolt eliminates the needs of washer on the bolt head end.

19. Toggle bolt

A toggle bolt, also known as a butterfly anchor, is a fastener for hanging objects on hollow walls such as drywall. Toggle bolts have wings that open inside a hollow wall, bracing against it to hold the fastener securely.

The wings, once fully opened, greatly expand the surface area making contact with the back of the hollow wall. This ultimately spreads out the weight of the secured item, increasing the weight that can be secured compared to a regular bolt.

20. U bolt

A U-bolt is a bolt in the shape of the letter U with screw threads on both ends. U-bolts have primarily been used to support pipework, pipes through which fluids and gasses pass.

21. Shoulder bolt

Shoulder screws, also known as shoulder bolts and stripper bolts, are machine screws with an integral shoulder or journal between the head and thread. Although they are not readily available in local hardware stores, shoulder screws are used extensively in industries from aerospace to consumer products because of their versatility and unique attributes when installed.

Shoulder screws have three main sections: head, shoulder, and thread. The head has the largest diameter, the shoulder is described by its diameter and length, and the thread has a major diameter slightly smaller than the shoulder diameter.

When the thread of the shoulder screw is fully installed, the un threaded shoulder extends beyond the surface into which the thread embeds. The shoulders give the screws their versatility by acting as shafts or dowels for rotating items such as bearings and bushings, axles for rolling parts, guides for sliding elements, and pivot points or mounting pins.

22. Foundation bolt

Foundation bolts are mainly used in pre-engineered buildings manufacturing, fastening heavy machines to foundations, and construction. They are also used in process-based businesses like petrochemical, sugar, and FMCG manufacturing.

The base of the bolt use to be covered with concrete and the threaded part used to install the structure