Symptoms
- Thumb-turn or key turns partway then stops
- Bolt doesn't fully extend into the frame
- Door has to be lifted, pulled, or pushed for the bolt to engage
Likely causes
- CommonStrike plate hole misaligned with the boltHouse settling or a sagging door commonly shifts this alignment over time.
- CommonDoor not sitting square in the frame when closedA warped or sagging door changes where the bolt lines up.
- PossibleDebris or paint buildup in the strike plate holeDirt or paint can block the bolt from fully seating.
- PossibleBent bolt or worn lock mechanismPhysical damage to the bolt itself will prevent smooth operation.
What to do
- Close the door and try to lock it, noting exactly where the bolt stops.
- Check the strike plate hole for paint, dirt, or debris and clean it out.
- Apply lipstick or chalk to the end of the bolt, close the door, and try locking to see where it marks the strike plate.
- Adjust or enlarge the strike plate hole based on the mark, or reposition the plate if needed.
- Check hinge screws and tighten or replace any that are loose to fix a sagging door.
- Lubricate the bolt and strike plate with dry lubricant once alignment is corrected.
Tools and parts
- Screwdriver
- Metal file
- Dry lock lubricant
Replacement strike plateSearch: “door strike plate”
When to call a pro
Call a locksmith or handyman if adjusting the strike plate doesn't fix it, or if the bolt itself appears bent or damaged.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.