What is the chuck size of a cordless impact driver?
What is the cordless impact driver chuck size? |
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| When selecting a cordless impact driver, you will probably come across the term ‘chuck size’. This refers to the maximum shank diameter the chuck will accept. | ||||
What is the shank? |
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The shank is the part of a screwdriver bit, drill bit or bit holder that is actually held in the chuck.
Screwdriver bits and bit holders all have hexagonally-shaped shanks, while drill bits tend to have cylindrical, also known as ‘straight’ shanks. |
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How do you measure the shank diameter?For hexagonal shanks, the diameter is measured across the flats. |
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For straight shanks, the diameter can be taken from any point around the circumference. | |||
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Most cordless impact drivers have 6.35mm (¼”) hexagonally-shaped chucks. This means that they can only accept bits with hexagonal shanks with 6.35mm diameters.
Most screwdriver bits have 6.35mm hexagonal shanks, whereas a lot of drill bits will have straight shanks of varying sizes. |
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These days, you can purchase a wide variety of drill bits with 6.35mm hex shanks. However, you may not be able to use any old drill bit you have at home in your cordless impact driver. | |||
What chuck size do you need? |
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Quite simply, larger chucks can accept shanks with greater diameters.
When selecting a chuck, you should find out the shank diameter of the bits you want to use, and then choose your chuck size accordingly. |
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