Types of Bolts and Nuts with Pictures and It's Uses

Hello friends, Today we are going to discuss types of bolts and nuts with pictures and also know step by step their functions.

Bolts and nuts are used for many purposes but the main function is to hold the objects or components.

So friends without wasting time let's know the types of bolts and nuts with pictures.

What is Bolt?

Bolts are the types of fasteners that are used with nuts and often with washers.

Bolts are produced in very large sizes and the diameter of the bolt increases with length.

The size of the bolts is taken from the diameter of the shank and its length.

The threaded part of the bolts is called the shank or the remaining part is the shank except for the head.

Types of Bolt

There are following types of bolts are used:
  • Hexagonal Bolt
  • Square Head Bolt
  • Carriage Bolt
  • Round Head or Cup Bolt
  • T- Square Head Bolt
  • J - Bolt
  • U-Bolt
  • Eye Bolt
  • Shoulder Bolt
  • Cylindrical Head Bolt
  • Elevator Bolt
  • Hanger Bolt 
  • Lag Bolt

See in figure types of bolts which are mostly used in industries.

types of bolts and nuts with pictures
Types of Bolts

Hexagonal Bolt

Hexagonal bolts are commonly used because their basic shape is such that they can be widely used.

This bolt has a 6-sided head, threaded shaft, and is made from various steel grades.

Hexagonal bolts are threaded and require a matching size nut to complete the operation.

The head of the hexagonal bolt is chamfered at 30° angles so that it can be opened and tightened easily.

Square Head Bolt

The head of such a bolt is square in shape and is used where it can be fitted into the groove.

Carriage Bolt

The carriage bolts are made smooth, round head and bottom in the cubic section so that it tightens properly when tightened. 

Use of carriage bolt in general to connect large structural units of wood.

These bolts also have threaded shafts that require matching threaded nuts. 

Round Head or Cup Bolt

This type of bolt is in the oval shape, which is mostly used in the Carpenter Shop.

It is also known as a Rail track bolt.

T- Square Head Bolt

This type of bolt's head is in shape like the English word "T" and it is mostly used for fitting any job or workpiece in a table.

 J - Bolt

J-shaped bolts are used as tie-downs or open eye bolts.

It is also called a hook bolt or j hook bolt.

Hook bolts are mostly used for the fitting of sheets in sheds.

Show in the figure, the next bolts are U-bolt, Eyebolt, Lag bolt, etc.

types of bolts and nuts with pictures
Types of Bolt


This bolt is shaped like the English letter 'U' which is used for connecting pipes or other round surfaces. It is also found in the shape of a square band.

Eye Bolt

This is a bolt with a circular ring at the head end. 

Eye bolts are fitted into the heavy bodies of the machine allowing them to be lifted by cranes or other lifting machines.

Shoulder Bolt

Shoulder bolts which are also called stripper bolts are used to make the pivot point.

Cylindrical Head Bolt

The head of such bolts is cylindrical and it is also known as a cheese head bolt.

Elevator Bolt

Elevator bolts are often used in conveyor systems. 

They have large, flat heads.

Hanger Bolt 

Hanger bolts have wood threads on one end and machine threads on the other end.

Lag Bolt

Lag bolts look like a hexagonal bolt as they also have a hexagonal head.

But the lag bolt consists of a pointed wood shaft and is used to hold wood without thread nuts.

Before these bolts can be used, it is necessary to drill a pilot hole in the wood so that the wood does not rip.

So, here in this topic" types of bolts and nuts with pictures" we have to know complete details of bolts and it's typed now we will know about nuts and it's typed.

What is Nuts?

A nut is also a type of fastener that contains a threaded hole.

Nuts are almost always used with mating bolts to hold parts together.

Locking tools may be used in applications where vibration or rotation can loosen nuts. 

Nuts are found in many varieties that can range from domestic hardware to industry, which is designed according to the appropriate technical standards as required.

Types of Nuts

There are following types of nuts are used:
  • Hexagonal Nut
  • Square Nut
  • Cap Nut
  • Flange Nut
  • Dome Nut
  • Capstan Nut
  • Ring Nut
  • Knurled Nut
  • Thumb Nut
  • Wing Nut

See in the figure different types of nuts that are used for various purposes.

Types of bolts and nuts with pictures
Types of Nuts

Hexagonal Nut

The shape of such nuts is hexagonal, and It is the most commonly used nut in industries.

This type of nut requires very little clearance to open and tighten because its hexagonal shape causes the spanner has to rotate at 60°.

Square Nut

The shape of such a nut is square and has four faces.

This type of nut requires more clearance to tighten and open because its square shape causes the spanner has to rotate at 90°.

Cap Nut

This type of nut has a cap so that the bolt and nut are protected from water, etc.

Flange Nut

This type of nut has a collar that acts as a washer.

Dome Nut

This type of nut is dome shaped and it's also protected from water, dust, etc.

Capstan Nut

This type of nut is round in shape and has small holes in its circumference.

"C" Spanner is used to open and tighten this nut.

Ring Nut

This type of nut is also round in shape and has slots on its outer periphery.

It also requires a "C" spanner to open and tighten.

Knurled Nut

Its outer surface is knurled and can be easily opened and tightened by hand.

It is used where the nut has to be tightened or opened repeatedly.

Thumb Nut

It also has knurling on the outer surface, but the only difference is that a collar is made in this nut.

Wing Nut

In this type of nut, two wings are made on its periphery so that the nut can be opened and tightened easily.

So, Friends here I discussed complete details of types of bolts and nuts with pictures.

I hope you all enjoy this topic and clearly understand all aspects related to types of bolts and nuts with pictures.

Thank You.

Post a Comment


Kaci said…
informative, but could have been more so with info on types of applications