A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. A wide variety of nuts exists, from household hardware versions to specialized industry-specific designs that are engineered to meet various technical standards.

In normal use a nut and bolt joint holds together because the bolt is under a constant tensile stress called the preload. The preload pulls the nut threads against the bolt threads. The nut face against the bearing surface with a constant force so that the nut cannot rotate without overcoming the friction between these surfaces.

If the joint is subjected to vibration, The preload increases and decreases with each cycle of movement. Square nuts as well as bolt heads were the first shape made and used to be the most common largely because they were much easier to manufacture especially by hand.


There is a large overlap between bolts and screws in function. Bolts are often used to make a bolted joint. This is a combination of the nut applying an axial clamping force and also the shank of the bolt acting as a dowel, pinning the joint against sideways shear forces.

The most common method is to use nuts, bolts and screws. Nuts and bolts are usually used at the same time the bolt is inserted through a hole drilled in each item to be fastened together, then the nut is threaded onto the bolt from the other side and tightened, to give a strong connection.

Many threaded fasteners can be described as either screws or bolts depending on how they are used. Bolts are often used to make a bolted joint. This is a combination of the nut applying an axial clamping force and also the shank of the bolt acting as a dowel, pinning the joint against sideways shear forces.


The washer helps prevent damage to the surface of the object being fastened. In most cases where the bolt is easier to turn, the bolt has a round head that will cause less damage anyway. Lock washers always go on the nut side to stop the nut moving.

Lock washers are almost always used with a flat washer as well. The nut is also often smaller in profile than the bolt head. The washer helps distribute the pressure that the nut places on the surface of the fastened objects.

Standard washers have two main purposes ,To distribute the pressure of the nut evenly over the surface, so that the surface isn't damaged and To ensure that the nut is pressed against a smooth surface, reducing the chance that it'll gradually loosen because it's in contact with an uneven surface.


Riveting is the permanent connection of two or more workpieces the rivet being put as a joint in a predrilled bore hole and formed on one or both ends. The riveted parts can be connected in a movable, fixed, close or fixed and close manner.

Aircraft Rivets sheets of metal must be fastened together to form the aircraft structure and this is usually done with solid aluminum alloy rivets. A rivet is a metal pin with a formed head on one end when the rivet is manufactured.

Use rivets to secure materials together, such as wood or metal. Rivets are flat and look similar to snaps or two headed nails and you see them on everything from clothing and handbags to boats and plastic items. Solid rivets consist simply of a shaft and head that are deformed with a hammer or rivet gun.


A threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends. The thread may extend along the complete length of the rod. They are designed to be used in tension. Threaded rod in bar stock form is often called all thread.

Threaded rod is a fastening bar or a rod threaded along its length. Thread direction is an important specification to consider. Choices include right hand, left hand, or both right hand and left hand.

All thread rod commonly referred to as fully threaded rod, redi rod, continuously threaded rod, TFL rod, and abbreviated ATR is used for general purpose fastening for anything from an anchor bolt to a through bolt. A variety of grades and materials are available.


Most screws have slot heads and are driven with slotted, or standard, screwdrivers. or standard, screwdrivers. Phillips-head screws have crossed slots and are driven with Phillips screwdrivers.

For most home repair purposes, wood screws will suffice. Sheet metal screws, machine screws, and lag screws

Wood screws are usually made of steel, although brass, nickel, bronze, and copper screws should be used if there is potential for corrosion. For optimum wood screw performance, you need to drill first. Machine screws are blunt ended screws used to fasten metal parts together. They are commonly made of steel or brass.

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hardware is a group of metal hardware specifically used for protection, decoration, and convenience in buildings.