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Fix a deadbolt that sticks

We'll rule out dust and misalignment, then isolate the cause—lack of lubrication, strike plate binding, or worn mechanism—and fix it or tell you when to call a pro.

Troubleshooting · Home maintenance
10–20 min
What you'll need
  • Graphite powder or graphite-based lock lubricant
  • Dry cloth
  • Screwdriver (Phillips and flathead)
  • File or chisel (if strike plate hole needs adjustment)
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Steps

Goal: Confirm where the deadbolt sticks, then rule out dust and misalignment before isolating the cause.

  • Turn the key or thumb turn and watch the bolt.
  • Good: The key is hard to turn, the bolt is slow to extend, or the bolt binds in the strike plate hole—proceed to Lubricant.
  • Bad: The door will not lock at all—different problem; see Fix a door that will not lock.

Lubricant

Goal: Clean and lubricate the keyway and bolt so the deadbolt operates smoothly.

  • Wipe the key and keyway with a dry cloth. Blow out dust with compressed air if available. Open the door and wipe the bolt.
  • Apply graphite powder to the keyway and bolt. Insert the key and turn it several times. Extend and retract the bolt to work the lubricant in. Avoid oil—it attracts dust.
  • Work the key and bolt 10–15 times.
  • Good: The deadbolt operates more smoothly—you may be done.
  • Bad: Still sticks—proceed to Strike plate alignment.

Strike plate alignment

Goal: Align the strike plate so the bolt enters the hole without binding.

  • Close the door. Turn the key and watch whether the bolt enters the strike plate hole cleanly or binds.
  • If the bolt binds, loosen the strike plate screws. Move the strike plate so the bolt enters the hole. If the hole is too small, enlarge it with a file or chisel.
  • Tighten the screws. Close the door and turn the key.
  • Good: The bolt extends and retracts without binding—done.
  • Bad: Still sticks—call a locksmith.

When to get help

Call a locksmith if:

  • The key will not turn or the key is stuck in the cylinder.
  • The bolt is bent or damaged.
  • You have lubricated and adjusted the strike plate and it still sticks.

Do not force a key—it can break in the cylinder. For related fixes, see Fix a door that will not lock or Fix a door that sticks.

Verification

  • The key turns smoothly in both directions (lock and release).
  • The bolt extends and retracts without resistance.
  • The bolt enters the strike plate hole cleanly when the door is closed.
  • No binding or sticking when operating the deadbolt from either side.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Note where the deadbolt sticks—key, bolt, or strike plate.
  2. Clean and lubricate Clean keyway and bolt; apply graphite lubricant.
  3. Strike plate alignment Adjust or enlarge the strike plate hole if the bolt binds.
  4. Call a pro Key will not turn, bolt bent, or repeated failures—call a locksmith.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Where the deadbolt sticks (key, bolt, strike plate)
  • Whether lubricant was applied
  • Whether strike plate is aligned
  • Steps already tried

Does the deadbolt stick when turning the key or extending the bolt?

Turn the key or thumb turn. Note whether the key is hard to turn, the bolt is slow to extend, or the bolt binds in the strike plate hole.

Turn the key and watch the bolt. Yes: Key hard to turn, bolt slow, or bolt binds—proceed to clean and lubricate. No: If the deadbolt operates smoothly, you are done. If the door will not lock at all, that is a different problem.

Yes No

You can change your answer later.

Did lubricant reduce or eliminate the sticking?

Clean the keyway and bolt. Apply graphite powder to the keyway and bolt. Work the key and bolt several times.

Clean the keyway and bolt with a dry cloth. Apply graphite powder to the keyway and bolt. Avoid oil. Work the key and bolt 10–15 times. Yes: Deadbolt operates smoothly—done. No: Still sticks—proceed to check strike plate.

Yes No

You can change your answer later.

Does the bolt bind in the strike plate hole?

Close the door and turn the key. Watch whether the bolt enters the strike plate hole cleanly or binds.

Close the door. Turn the key and watch the bolt. Yes: Bolt binds in the hole—adjust the strike plate. No: Bolt extends smoothly but key was hard to turn—lubricant may need more time, or call a locksmith. Bolt does not extend: Mechanism may be faulty—call a locksmith.

Yes No

You can change your answer later.

Adjust strike plate and test

Loosen the strike plate screws. Move the strike plate so the bolt enters the hole. Enlarge the hole with a file or chisel if needed. Tighten screws. Close the door and turn the key. Good: Bolt extends and retracts smoothly—done. Bad: Still sticks—call a locksmith.

Done

Deadbolt operates smoothly

The deadbolt locks and releases without resistance. No further action needed.

Done

No action needed or different problem

If the deadbolt operates smoothly, you are done. If the door will not lock at all (bolt does not extend, key will not turn), that is a different problem—see Fix a door that will not lock.

Done

Call a locksmith

Call a locksmith if: the key will not turn; the key is stuck in the cylinder; the bolt is bent or damaged; or you have lubricated and adjusted the strike plate and it still sticks. Do not force a key—it can break in the cylinder.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why does a deadbolt stick when turning the key?
Common causes: dust or debris in the keyway, lack of lubrication, a misaligned strike plate (bolt binds in the hole), or a worn or corroded lock mechanism. Graphite lubricant usually fixes dust and dryness; strike plate adjustment fixes misalignment.
What lubricant should I use on a deadbolt?
Use graphite powder or a silicone-based lock lubricant. Avoid oil—it attracts dust and can gum up the mechanism. Apply a small amount to the keyway and to the bolt; work the key and bolt several times to distribute it.
When should I call a locksmith for a sticking deadbolt?
Call a locksmith if the key will not turn, the key is stuck in the cylinder, the bolt is bent or damaged, or you have lubricated and adjusted the strike plate and it still sticks. Do not force the key—it can break in the cylinder.

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