What is chuck size?

 Shop for Cordless Drill Drivers 
 Blue cordless drill driver with a red circle around the chuck 

When selecting a cordless drill driver, you will probably come across the term ‘chuck size’. This refers to the maximum shank diameter the chuck will accept.

 Grey hexagon with a double ended arrow across the centre 

The shank diameter of a bit is the measurement across the centre of the shank. Hexagonal shanks are always measured across their flats.

 Grey circle with a double ended arrow across the centre 

The measurement for a straight shank's diameter can be take from any point around the circumference.


What size chuck do I need?

 Keyless chuck for a cordless drill driver 

Cordless drill driver chucks come in the following sizes:


10mm (3/8 inch)

 13mm cordless drill driver chuck 

13mm (1/2 inch)


Quite simply, the larger your chuck size, the larger shank diameter it will accept.

  Wonkee Donkee says "When first selecting a chuck, you should first find out the shank diameter of the bits you want to use, and then select your chuck size accordingly." 
 Yellow and black cordless drill driver with a 13mm chuck 

Generally, if you want to drill holes larger than 20mm in diameter or drill into materials such as metal, then consider purchasing a drill driver with a 13mm chuck, to accommodate larger bits.

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