Your question: What are the three most common types of bolts?

The most common type of bolt head types includes square, hex, slotted hex washer and socket cap. The earliest bolt heads in use were the square heads. Square heads consist of a square indentation on the head followed by a shaft that withstands rotation when a torque is applied to it.

What are the three types of bolts?

There are many types of bolts and hardware nuts. Most, if not all, bolt types have machine threads. A threaded bolt screws into nuts to hold or fasten materials together. Bolt types include eye bolts, wheel bolts and machine bolts while types of nuts include cap nuts, expansion nuts and u-nuts.

What are the most commonly used bolts?

The most common type of bolts includes carriage bolts, hex head bolts, machine screws, shoulder bolts and socket cap screws among others. Carriage bolts are designed with a countersunk head. The bolt has a square section underneath the head which prevents further tightening of the bolt once the nut is fixed in place.

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What are the types of bolts?


Fastener Type Standard or Implied Drive
Bolt Hex Head
Lag Bolt/Screw Hex Head
Carriage Bolt/Screw No Drive
Socket Bolt/Screw Allen Drive

What are the 3 main types of threaded fasteners?

Threaded Fasteners

There are three main types of threaded fastener; Bolts, Screws and Studs. Bolts have a head on one end (this is usually a hex head) and are threaded on the other. They are generally used in conjunction with a nut (and sometimes a washer) to hold them in place.

What are the different types of bolts and their uses?

The principal types of bolts commonly used include:

  • Anchor Bolts.
  • Blind Bolts.
  • Carriage Bolts.
  • Double End Bolts.
  • Eye Bolts.
  • Flange Bolts.
  • Hex Bolts.
  • Machine Bolts and Machine Screws.

What is bolt and its types?

Bolt Types

Name Description
Machine bolts Square heads paired with a semi-cone point and a fully threaded shaft.
Plow bolts Similar to carriage bolts. Contains a countersunk flat head followed by a square undercut and a threaded shaft.
Roof bolts Made of a shaft that is to be placed in a pre-drilled hole.

What are the various types of bolts used for structural purposes?

Bolts used in steel structures are of three types: 1) Black Bolts 2) Turned and Fitted Bolts and 3) High Strength Friction Grip (HSFG) Bolts. Bolt is a metal pin with a head at one end and a shank threaded at other end to receive a nut, as shown in Figure 6.

How many types of anchor bolts are there?

Anchor bolts are generally used to attach steel metal to concrete. It’s one end is inserted into the concrete, and another end is threaded to connect structural support. There are four types of anchor bolts such as double-end rods with plate, L-shaped, headed, and swedge type.

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What kind of metal are bolts?

The majority of industrial fasteners are produced from aluminum, brass, certain synthetic non-metals, and various grades of steel and stainless steel. In addition, metals such as titanium are also valuable for building fasteners, although they have very specific applications in a narrow range of fields.

How many types of threads are there?

Six Most Common Types of Threads

NPT/NPTF. BSPP (BSP, parallel) BSPT (BSP, tapered) metric parallel.

Is a bolt a type of screw?

A bolt is a non-tapered fastener that uses a washer and nut to hold objects together. A screw is a tapered fastener that mates with an existing thread or creates its own thread in a material as it turns.

What is the top of a bolt called?

An Introduction to the Parts of a Bolt

  • Head. The head is the uppermost part of a bolt. It serves as the gripping surface for tools. …
  • Shank. Below the head is the shank. The shank is the smooth part of a bolt that’s devoid of threading. …
  • Threading. All bolts have threading.

What are the three most important properties that are used to specify a threaded fastener?

There are three characteristic diameters (⌀) of threads: major diameter, minor diameter, and pitch diameter: Industry standards specify minimum (min.)

What grade is a bolt with 3 markings?

Three radial lines will indicate an SAE grade 5 fastener, while six radial lines will indicate an SAE grade 8 fastener.

What are the types of threaded fasteners?

Types of Threaded Fastener

  • The most common threaded fastener types are screws, nuts, bolts and washers, although there also specialist types for specific fastening applications.
  • Dome nuts, also known as cap nuts or acorn nuts, get their name from their shape.
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