Symptoms
- Chuck opens but bit doesn't drop or pull free
- Bit spins with the chuck jaws instead of releasing
- Rust or corrosion visible on the bit shank
- Chuck feels gritty when turned
Likely causes
- CommonBit shank corroded or rusted to the jawsRust creates a bond between the shank and the metal jaws that resists a normal pull.
- CommonDebris packed around the shank inside the jawsWood or metal dust can wedge the bit in place even with the jaws open.
- PossibleChuck over-tightened originally, deforming the shank slightlyExcessive force can leave a slight groove that catches on the jaws.
- Less commonWrong bit size mismatched to the chuck causing bindingAn odd-sized or damaged bit can bind unevenly in the jaws.
What to do
- Open the chuck as far as it will go and try pulling the bit straight out by hand first.
- Tap the chuck gently with a rubber mallet while pulling to jar loose debris or light rust.
- Apply a few drops of penetrating oil around the jaws and let it sit for several minutes before trying again.
- Use pliers to grip the bit shank (protect it with a cloth) while turning the chuck to open it fully.
- If it's a keyed chuck, make sure it's actually turned all the way open with the key before pulling.
- As a last resort, hold the chuck steady and use gentle pressure with two wrenches (one on the chuck, one on the bit shank if it has flats) to work it free.
Tools and parts
- Rubber mallet
- Penetrating oil
- Pliers or two wrenches
- Cloth
When to call a pro
If a bit is truly seized and force risks damaging the chuck, a tool repair shop can remove it safely or replace the chuck if needed.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.