What are the different styles of screwdriver bit?

Chris

3rd March 2020

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What are the different types of screwdriver bit?

The design or style of a screwdriver bit refers to the shape of its body.

Most screwdriver bits you come across will be one of the following two styles:

Each have their own particular set of characteristics.

Insert bits are usually 25mm (1″) in length and are the most common style of bit used in cordless screwdrivers.

Because they are often quite small, insert bits are usually used in a cordless screwdrivers that have magnetic bit holders instead of chucks.

On the body of the insert bit is a notch which shows how far the insert bit will sit in the magnetic bit holder.

The shank of an insert screwdriver bit is always hexagonally-shaped.

Advantages		Disadvantages
Less expensive than power bits		The bit is likely to be worn down and need replacing more frequently

Power bits are usually 50mm (2″) in length.

Because they are longer than insert bits, power bits are often used in cordless drill drivers as the bit sits further down inside the chuck.

The shank of a power screwdriver bit is always hexagonally-shaped.

Advantages		Disadvantages
Compared to insert bits, power bits are more resistant to wear and designed to last longer Power bits are longer and can therefore extend the reach of your power tool Compared to insert bits, power bits are held more securely in quick-release chucks This is because they have a special groove on their body which engages with metal ball bearings inside the quick-release chuck		More expensive than insert bits

Providing they are the correct size, insert and power bits can be used in tools with:

Most cordless drill drivers have 3-jawed chucks.

This type of chuck is mainly found on cordless impact drivers and screwdrivers.

Most light and medium duty cordless screwdrivers have these types of chucks.