Sticks only when the door is closed
The key or thumbturn works normally with the door open, but gets tight or stops when the door is shut.
Start here: Check door alignment and the strike opening first.
Door lock troubleshooting
Door Deadbolt Sticks
Direct answer: A sticking deadbolt is usually caused by door-to-frame misalignment, loose hinge or strike screws, or a dry/worn deadbolt that binds only when the door is closed.
Most likely: Start by checking whether the deadbolt turns smoothly with the door open. If it does, the problem is usually alignment at the strike. If it still sticks with the door open, the deadbolt itself is the stronger suspect.
Deadbolts rarely get better on their own. Most start with a little drag, then turn hard, then leave you fighting the key or thumbturn at the worst time. The good news is that you can usually separate a frame-alignment problem from a bad deadbolt in a few minutes without taking the whole door apart. Reality check: a lot of “bad locks” are really doors that have shifted just enough to pinch the bolt. Common wrong move: spraying oily lubricant into the keyway and calling it fixed, which often leaves you with a dirtier, stickier lock later.
Don’t start with: Do not start by forcing the key, filing random metal off the bolt, or buying a new lock before you know whether the door or the hardware is causing the bind.
Turns fine with door openFocus on strike alignment, hinge sag, and whether the bolt is rubbing the frame.
Sticks even with door openFocus on the deadbolt cylinder, thumbturn, and internal bolt mechanism.
Last reviewed: 2026-04-05
What kind of sticking are you dealing with?
Sticks with the door open too
The deadbolt feels rough, gritty, or hard to turn even when the bolt is not entering the frame.
Start here: Check for a dry or worn deadbolt before adjusting the frame.
Key turns hard but thumbturn is easier
Outside operation is stiff, but the inside thumbturn works a little better.
Start here: Look for cylinder wear, dirt in the keyway, or a slightly twisted lock installation.
Thumbturn binds or stops partway
The inside turn piece feels tight, catches, or needs extra force near the end of travel.
Start here: Check for loose mounting screws, a shifted lock body, or an internal deadbolt problem.
Most likely causes
1. Door and strike are slightly out of alignment
This is the most common pattern when the deadbolt works with the door open but drags when closed. Seasonal movement, hinge sag, or a house settling a bit can move the bolt path just enough to bind.
Quick check: Color the end of the bolt with a pencil, close the door, turn the lock once, and look for rub marks on the strike plate or frame opening.
2. Loose hinge screws or strike screws let the door shift
A door can drop or rack just enough that the latch still catches but the deadbolt no longer lines up cleanly.
Quick check: Open the door and lift on the handle side. If you feel movement at the hinges or see a gap change at the top, tighten the hinge screws first.
3. Dry, dirty, or worn deadbolt mechanism
If the deadbolt feels stiff with the door open, the bind is usually inside the lock body or cylinder rather than at the frame.
Quick check: Operate the deadbolt several times with the door open. Rough travel, catching, or uneven resistance points to the deadbolt itself.
4. Bolt or strike opening is obstructed or burred
Paint buildup, wood swelling, a bent strike plate, or a rough edge inside the strike pocket can stop the bolt before full travel.
Quick check: Look into the strike opening with a flashlight for fresh scrape marks, paint ridges, splintered wood, or a bent plate edge.
Step-by-step fix
Step 1: See whether the deadbolt sticks with the door open or only when closed
This separates a door-alignment problem from a deadbolt problem right away, and it keeps you from replacing a good lock.
- Open the door and throw the deadbolt in and out several times using the thumbturn and the key if you have one.
- Close the door gently and try the same test again without slamming the door tighter into the frame.
- Notice whether the resistance shows up only at the end of travel, all through the turn, or only from one side of the lock.
Next move: If the deadbolt is smooth with the door open and sticky only when closed, move to alignment checks at the frame and hinges. If it still binds with the door open, skip ahead mentally to the deadbolt hardware itself and keep checking for loose mounting or internal wear.
What to conclude: A lock that works open but not closed is usually being forced out of line by the door or strike. A lock that sticks either way usually has a hardware issue.
Stop if:
- The key feels like it may snap.
- The thumbturn will not move back without heavy force.
- The door is your only secure exterior entry and you may lock yourself out mid-repair.
Step 2: Tighten the hinges and look for door sag before touching the lock
A sagging door is one of the most common reasons a deadbolt starts rubbing the strike, and tightening screws is the least destructive fix.
- Check all visible hinge screws on the door and frame side and snug any loose ones by hand.
- Watch the reveal around the door, especially the top corner near the strike side, for an uneven gap.
- Lift gently on the handle side of the open door. If the door moves up and down, the hinges are letting it drop.
- Retest the deadbolt after tightening screws, first with the door open and then closed.
Next move: If the deadbolt now turns normally, the door had shifted enough to bind the bolt path. Keep an eye on those screws over the next few weeks. If the deadbolt still sticks only when closed, inspect the strike area closely next.
What to conclude: Small hinge movement can throw the deadbolt off more than you would expect, especially on a heavy front door.
Step 3: Inspect the strike plate and bolt path for rubbing, paint, or swelling
If the bolt is hitting the edge of the strike opening, you need to correct the path, not force the lock harder.
- Use a flashlight to look at the strike plate opening and the pocket behind it.
- Look for shiny rub marks, scraped paint, splintered wood, or a bolt mark high, low, or to one side of center.
- Close the door and turn the deadbolt slowly while watching how the bolt enters the strike as much as you safely can.
- If there is paint buildup or loose debris in the strike opening, remove only the obstruction and retest.
- If the strike plate screws are loose, tighten them and retest.
Next move: If clearing the opening or tightening the strike stops the sticking, the deadbolt was being blocked at the frame. If the bolt still hits off-center, the door or strike position needs adjustment rather than more force on the lock.
Step 4: Check the deadbolt mounting and test for a worn or twisted lock body
When the deadbolt sticks even with the door open, loose mounting screws or a worn mechanism are the next most likely causes.
- With the door open, tighten the deadbolt's interior mounting screws evenly so the lock body sits square, not twisted.
- Operate the thumbturn again. If it got worse after tightening, back off slightly and center the lock body before retightening.
- Test the key from the outside if accessible. Compare how smooth it feels versus the thumbturn.
- Look for a bolt that hesitates, catches, or does not extend and retract in one smooth motion.
Next move: If centering and snugging the deadbolt makes it smooth again, the lock body had shifted and was binding internally. If the deadbolt still feels rough with the door open, the mechanism is likely worn enough to replace.
Step 5: Make the repair path decision: adjust alignment or replace the deadbolt
By now you should know whether the sticking comes from the door fit or from the deadbolt itself, which keeps the fix focused.
- If the deadbolt works open but not closed, correct the alignment issue at the hinges or strike so the bolt enters cleanly without pressure.
- If the deadbolt sticks open and closed after mounting screws are checked, replace the door deadbolt with a matching backset and bore size.
- After the repair, lock and unlock the door at least ten times from both sides with the door open and closed.
- Make sure the deadbolt throws fully without pushing, lifting, or pulling the door into position.
A good result: If the deadbolt now turns smoothly and locks without forcing the door, the repair is done.
If not: If you still need pressure on the door or the new deadbolt also binds, the problem is in the door fit or frame movement, not the lock hardware.
What to conclude: A smooth deadbolt should not need muscle. If it does, something is still out of line.
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FAQ
Why does my deadbolt stick only when the door is closed?
That usually means the bolt is not lining up cleanly with the strike opening. The lock may be fine, but the door has shifted enough that the bolt rubs the frame or strike plate.
Can I just spray lubricant into a sticking deadbolt?
Sometimes a dry deadbolt improves with the right dry lock lubricant, but only if the lock sticks with the door open too. If it only sticks when closed, lubricant will not fix a misaligned door or strike.
Is the deadbolt bad if the key is hard to turn?
Not always. If the key is hard to turn only when the door is shut, alignment is still the first thing to check. If the key is hard to turn with the door open, the cylinder or deadbolt mechanism is more likely worn.
Should I file the strike plate so the bolt fits?
Only after you confirm exactly where the bolt is rubbing and only in a controlled, minimal way. Random filing can leave a sloppy fit and hide a hinge or frame problem that keeps getting worse.
When should I replace the deadbolt instead of adjusting the door?
Replace the deadbolt when it binds with the door open, catches through the full turn, or still feels rough after the lock body is centered and the mounting screws are checked. If it works smoothly open but not closed, stay focused on alignment first.