bolt and nuts

bolt and nuts

What kind of bolt and nut are there?

Let’s start with a simple definition. The bolt is a male-threaded fastener. It fits internal threads, i.e. nuts with female threads.

Thebolt and nut engage with the fastened material to form a bolted bond and the nut also prevents axial movement.

The action of a bolted joint relies on the axial clamping force provided by the body of the bolt and nut, which acts as a rod to counteract lateral shear forces on the joint. For this reason, many bolt shanks have no threads. This makes the rod stronger.

Bolts and Nuts

When should bolts or screws be used?

It is often believed that the difference between bolts and screws lies in the tools used for assembly (screwdriver for screws, wrench for bolts). However, this is not always the case. The bolt may have a head associated with the screw that requires a screwdriver to install. Some bolts also use nuts, so it corresponds to the gray zone. 

There are so numerous diverse bolts and screws out there, a few of them indeed comparative. Where they vary in general will assist you choose which one to utilize. 

The choice is fundamentally decided by the application and the material to be affixed. Screws work best with lightweight materials like plastic, plywood, and drywall. That’s almost it. Although bolts are also made of plastic, they are mainly used in electronic devices because they are lightweight, corrosion-resistant, and have excellent insulating properties.

Utilize bolts for applications designed to withstand the stresses of demanding use and heavy materials such as concrete or metal.

Carriage Bolts & Nuts

Type of bolt head

The bolt head design is fitted to the expected work of the bolt while permitting get-together tools to hold the head. Here are some examples of different types of bolt heads.

• Flat bolt head
• Oval bolt head
• Pan bolt head
• Truss bolt head
• Round bolt head
• Hex bolt head
• Hex washer bolt head
• Slotted hex washer bolt head
• Socket cap bolt head
• Button bolt head

 What types of Bolt are there?

Each bolt is designed for a specific application. Below is a description of the bolts to help you understand what they do.

Some types of bolts:                              

• Anchor: Used in the construction industry to attach structures to concrete slabs or poured foundations. 
• Blind: For structural applications where access is limited to one side, lock termination is allowed. 
• Double end: A bolt with threads at both ends. Used to fix two flanges or pipes more efficiently. 
• Hex: Characterized by its six-sided head, there are numerous diverse sorts of hex bolts. Regularly utilized in the components of a machine and construction applications.
• T Head: Moreover known as a T-slot. Embedded into a recess and with the connected nut, the jolt is secured against turning. It is common in construction and motor vehicles.

Some other types

• U-bolt
• J-Bolt
• Elevator
• Flange
• Hanger
• Lag
• Carriage
• Eye
• Penta-head
• shoulder

Another example

Kind of Nuts

Most of all kinds of nuts are hexagonal. Because it is easy to rotate; as it has 6 sides. If there are few sides of the nut, it’ll take time to assemble. Other shapes are available for specific needs.

Nut fastener type

• Dome
  • Acorn
  • Wing
  • Jam
  • Flange
  • Coupling
  • Nyloc
  • Square
  • Hex
  • Tee
  • Slotted
  • Castle
  • Keps-K lock nuts
  • Prevailing torque nut
  • Kwik

What is the reason for using washers with bolts and nuts?

Utilizing washers to distribute the load of threaded fasteners, such as bolts or nuts. Use screws for the same reason. You do not actually and technically require washers on bolt and nut, but I suggest utilizing them besides. 

If the bolt and nut assembly you’re utilizing isn’t tight enough, you will be able to utilize a washer to extend the distance between the nut and the item you’re attaching, expanding your leverage and allowing you to form a tighter association.

Types of Bolt and Nut

How do washers work with Bolts?

The washer equally conveys the load on the nut and ensures the mating surfaces from harm. It also gives your nut a flat surface to press on, which helps the fasteners stay tight instead of loosening. In a few cases, you should put the washer on the side of the bolt, but only if the bolt needs to be turned.

How to select the proper nut for your bolt 

The nut and bolt are held together by threads. The weakest shear plane in the thread profile is where failure can initiate. That is, the weakest material determines the strength of the connection. The point is that the bolt and nut must be made of the same alloys. Not only that, but your nut must meet or exceed the bolt’s maximum tensile strength, which is the amount of tension the bolt can withstand.

If safety is a major concern in your application, the nut should be stronger than the bolt. According to the Industrial Fasteners Institute, the tensile strength of the nut should be 20% greater than the tensile strength of the bolt.

Grade guide of Bolt

How to distinguish the quality of bolts? The strength of the fastener is shown by bolt grades. Having information about the bolt grades is very important to choose the right fastener. Bolt head markings as a rule incorporate grade and manufacturer’s marks. Dotted lines or numbers are represented by bolt grades.

Bolt parts

Understanding the structure of a bolt will assist you choose what you would like.

• Thread: Spiral protrusions that rotate around the body and engage with the nut.
  • Leak: The part where the bolt threads are “removed” and where the shank begins.
  • Shaft: The smooth, unthreaded part of a bolt.
  • Radius:  There is the curve between the shaft and head which is Radius
  • Head: The portion of the bolt that the torque instrument can hold for fixing or releasing. 
  • Thread length: The application specifies the length of the thread.