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What is spindle lock on a cordless impact driver?

Shop for Cordless Impact Drivers

The chuck of most impact drivers have a spindle lock function Most cordless impact drivers have a feature called spindle lock that, when selected, locks the motor’s spindle so the chuck cannot turn.
Chuck and tool bit are automatically locked when the trigger is released Most models of impact driver will have ‘automatic spindle lock’, which means that the chuck and metal bit are automatically locked when the speed control trigger is released.

When to use spindle lock

Screw which has been driven too tightly into wood

Loosening or tightening screws

Sometimes, it can be hard to start removing a screw using a cordless impact driver if it’s very tight. The tool can slip out of the screw head and damage the work surface. With spindle lock, you can use the cordless impact driver like a manual screwdriver, controlling the pressure on the screw and the speed at which you loosen it.

Loose screw Spindle lock can also be used to finish off the tightening of a screw, so that you don’t drive it too far into the surface of the material.
Inserting a drill bit with spindle lock

Safely inserting or removing bits

Selecting spindle lock allows you to insert or remove screwdriver or drill bits without worrying about the chuck rotating and causing injury.

Wonkee Donkee says "Ensure that the cordless impact driver does have spindle lock before using it like a manual screwdriver, otherwise you may force the motor to turn backwards and could damage the tool."

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