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What are the parts of an F-clamp?

What are the parts of an F-clamp?

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What are the parts of an F clamp?
Parts of an F clamp The main parts of an F-clamp consist of a bar, two jaws, a screw and a handle.


The bar is a long, straight piece of metal An F-clamp’s bar can also be called the sliding arm.

The bar of an F-clamp is a long, straight piece of metal which is strong enough to withstand the pressure of clamping heavy workpieces.

The bar of the clamp has three serrated edges Along the top of the bar are serrated edges, which are designed to give extra grip to lock the moveable jaw in place during clamping.
The steel bar is often tempered The bar is made from forged steel and is tempered, a heat treating process which increases the toughness of the metal. Although tempering can reduce the hardness of the forged steel very slightly, it actually improves the overall quality of the metal, as it results in steel that is much less brittle.
The steel is galvanised to protect from rust The bar can also be galvanised, which adds a protective layer of zinc over the steel and increases its resistance to rust.


The jaws of an F clamp hold the workpiece The jaws are responsible for gripping on to the workpiece and holding it securely in place.
Donke says 'F clamp jaws can be referred to as brackets'
An F clamp has two jaws The jaws are thin metal plates, placed parallel to each other. One jaw is situated at the end of the bar and is fixed in place. The other jaw is placed at the end of a sliding arm which can move along the metal bar, adjusting to the desired position.
The surface of the jaws are covered in jaw pads The clamping plates of the jaws are covered by plastic pads, in order to protect the clamped material from being damaged.


An F clamp has a large threaded screw An F-clamp has a threaded screw which controls the rounded plate of the moveable jaw. When the screw is tightened it brings the moveable jaw closer to the fixed, closing the two together. In contrast, when the screw is loosened it pulls the moveable jaw away, increasing the gap between the jaw plates.
The thread provides more torque for the clamp ACME is the thread ‘form’ used in an F-clamp, which refers to the shape of the helical ridge around the screw.


An F clamp handle is made of plastic The handle is connected to the clamp’s screw.

An F-clamp generally has a large handle which is designed to provide a comfortable grip when tightening the screw.

The handle is designed to be used one-handed The handle is also designed to be used one-handed if the user has one hand full.
Some models can have a sliding pin handle Although less common, some models of F-clamp have a sliding pin handle, known as a tommy bar.

Additional features

Some F clamps can have a spring lock mechanism

Spring lock

Some F-clamps have a spring lock mechanism which allows the moveable jaw to quickly slide along the serrated frame when the trigger is pressed. Once in the correct position, the jaw is locked into place when the trigger is released.

Some models have a tilting plate on the moveable jaw

Tilting jaw

Some models are designed with a tilting plate on the moveable jaw, to allow the clamp to grip on to tapered or angled workpieces.

Wonkee Donkee Tools