Symptoms
- Zipper slides down on its own
- Pants or jacket won't stay zipped
- Slider feels loose on the track
- Gap opens after a few minutes
Likely causes
- CommonSlider pull-tab widened from wearRepeated use spreads the metal slider so it grips less tightly.
- PossibleWorn or damaged teeth below the sliderMissing teeth give the slider nothing to lock onto.
- PossibleBroken zipper stop at the bottomWithout a stop the slider can travel too far and loosen.
- Less commonWrong-size replacement slider installed previouslyA mismatched slider won't grip the original teeth correctly.
What to do
- Zip the item all the way up and inspect the slider for a visible gap between its two halves.
- Using pliers padded with a cloth, gently squeeze the back and front of the slider closer together.
- Test by zipping up and down a few times; it should now hold position.
- If it still slips, attach a keyring or small loop of cord through the pull tab and clip it to a button or another zipper pull to hold it up.
- Check the teeth just below where the slider sits for missing or damaged teeth.
- If teeth are missing, the slider will need to be replaced rather than adjusted.
Tools and parts
- Pliers
- Small cloth (to protect fabric)
Replacement zipper sliderSearch: “zipper slider replacement kit size 5”
When to call a pro
For a favorite jacket or expensive bag, a tailor can swap in a new slider without replacing the whole zipper.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.