How To Diagnose and Replace a Broken Boltlock Snib
A broken boltlock snib could be a sign of an underlying issue with your sliding or stacking door, such as out of alignment rollers, loose keepers, or a problem with the lock body. We asked our friendly service team for some advice if this is happening to you.
What is a boltlock snib?
Boltlock snibs, sometimes called snib locks, are the little levers on your door handles that are used to lock or open your sliding doors. They come in two sizes:
- Top Snibs are larger and are used to open the door from inside or outside the house.
- Bottom Snibs are smaller and are used to lock the door from inside the house. The bottom boltlock snibs rarely break but will on occasion if taken out and used as a top snib.
Three potential causes of a broken snib
Boltlock snibs are easy to replace but it’s a good idea to diagnose the cause of a broken snib so it doesn’t become a recurring problem!
Our friendly service team highlight three of the most common causes of broken snibs:
- Rollers need replacing
- Keepers need replacing
- Lock body needs replacing
1. Check the rollers run smoothly and the door is level and square
Sometimes if the door is not level and square the snibs can break as the locking rods that run up and down the front door stile (piece of aluminium that the handle is screwed onto) drops down putting pressure on the snibs causing them to break.
If your door is not level you may need to adjust the rollers. You can adjust the screw clockwise to raise the roller or anticlockwise to lower the roller.
- Clockwise adjustment is usually required as the rollers have likely dropped.
- Adjust the roller and gently manoeuvre the snibs until they feel like they are moving smoothly.
- Replace the roller wheel if it looks damaged and does not roll correctly.
New rollers can be purchased from Jason Windows Spare Parts shop
2. Check the keepers are secured into your door frame
Keepers are located in the top and bottom of the frame and allow your door to be locked in a partially opened “vent” position, encouraging airflow but maintaining security.
If the keepers are loose or have come away from the jamb (the sides of the frame) this can put pressure on the lock body and cause the snibs to shear.
- Replace the keepers if they look damaged
New keepers can be purchased from Jason Windows Spare Parts shop.
3. The lock body may need to be replaced
If you have tried adjusting the rollers and checked that the keepers are in the correct position but are still having troubles, the lock body may need to be replaced.
- Watch the above video for a DIY guide on how to change the lock body
- When replacing the lock body make sure the key barrel/cylinder goes back in the same way it came out – this is extremely important otherwise a technician will be needed to resolve the issue (by drilling the top of the door stile).
A new lock body can be purchased from Jason Windows Spare Parts shop.
- Part number LCK101: Lock body mechanism to suit Jason Residential Doors with the Boltlock Handle Installed
- NB: Locking rods are no longer manufactured by the supplier. It is recommended to use the existing rods in the door.
If your rollers, keepers, and lock body are all in good working condition but the snibs still break it could be due to one of the following:
- The tracks, keepers and rollers may need cleaning to help the locking rods move freely.
- The snib is inadvertently being pulled or forced when the door is being opened, closed, and locked which over time can break the snib.
Replacement snibs can be purchased from our Spare Parts Shop or contact our friendly service team to help troubleshoot any problems you may experience with your Jason products at home.
About the Author
Dempsey O’Callaghan is the Service Manager at Jason Windows. Our Servicing and Spare Parts Team include 13 specialised Service Technicians fully trained on over 150 unique service tasks which may arise in the course of their day. It takes several years to master all of the facets of our Service Technician roles and many of our Service Technicians are also qualified glaziers. Our Servicing Support Team work behind the scenes to ensure that an average of 100 jobs are booked in and scheduled each day.