Best Sliding Door Outside Locks for Patio Door Security
The best sliding door outside lock depends on whether you need a complete replacement handle with a key cylinder or an additional lock for an existing door. House Guard is a fit-focused option with a reversible handle set; HauSun and ALLYWASAI offer full replacement kits with stated measurements. PRIME-LINE provides a separate keyed lock, while BurglaBar adds a non-keyed layer of security. Measure your door and check the lock style before choosing.
| Product | Best For | Key Feature |
|---|---|---|
| House Guard Handle Set | Replacing a compatible handle | Outside key cylinder included |
| HauSun Handle Set | Complete replacement kit | Multiple screw lengths |
| ALLYWASAI Handle Set | Replacement with stated door fit | Removable face plate |
| PRIME-LINE Keyed Lock | Adding a keyed lock | Push-button hardened steel bolt |
| BurglaBar Two-Pack | Supplemental security | Hinge-style design |
House Guard Sliding Door Handle Set
This full replacement set includes an interior handle, mortise lock, outside key cylinder, matching keys, and mounting screws. Its non-handed design is intended for left- or right-handed sliding patio doors.
Best for: Buyers replacing a compatible handle who want a key cylinder for locking and unlocking from outside. It was selected because the exterior key function and fit requirements are clearly specified.
Check first: The listed fit is 3-15/16-inch screw-hole spacing and 1-3/16- to 2-inch door thickness. Measure the old handle, lock position, and door before ordering. Test the key and latch before fully tightening the screws.
HauSun Keyed Handle And Mortise Lock Set
HauSun’s replacement kit includes an interior handle, exterior pull with key cylinder, mortise lock, thumb latch, and six screws in three lengths. The manufacturer lists 3-15/16-inch screw spacing and door thickness from 1-1/2 to 1-3/4 inches. The set is described as reversible and non-handed.
Best for: A buyer replacing a broken or outdated handle who wants the main lock components in one kit. The exterior key cylinder supports outside operation, and the different screw lengths provide options for installation.
Check first: This set is specified for doors with a mortise-style latching lock. Confirm the existing lock type, hole spacing, and thickness; the stated thickness range is narrower than some replacement sets.
ALLYWASAI Keyed Patio Door Handle Set
This full replacement set includes a mortise lock, key cylinder, and face plate. It is listed for door thicknesses from 1-1/2 to 1-3/4 inches and 3-15/16-inch screw-hole spacing. The handle is described as non-handed, and the kit includes six screws in three lengths.
Best for: Buyers whose measurements match the product specifications and who need a complete handle-and-lock replacement with an outside key cylinder. Its removable face plate is a useful detail to note during installation.
Check first: The specified thickness range is limited to 1-1/2 to 1-3/4 inches. The installation instructions caution that the face plate is removable, so handle it carefully when fitting the mortise lock.
PRIME-LINE Push-In Keyed Sliding Door Lock
This separate keyed lock uses a push-button mechanism and a hardened steel bolt. Two keys are included, and the lock uses a Yale Y-13 keyway. Unlike a complete handle replacement, this product is a standalone lock component.
Best for: Buyers looking for a keyed lock to add to a sliding door rather than replace the entire handle set. It was selected for its stated key operation and hardened steel bolt.
Check first: The listing information provided does not specify door thickness or hole spacing. Confirm that the lock’s mounting style suits your door before purchasing; do not assume it replaces a handle-and-mortise assembly.
BurglaBar Two-Pack Supplemental Locks
BurglaBar is a hinge-style supplemental lock for sliding glass doors and sash windows. The two-pack is described as tool-free to install, adjustable, and clear in appearance. It is not described as an exterior keyed lock, so it serves a different purpose from the handle sets above.
Best for: Buyers seeking an additional security measure alongside an existing door lock. It was selected as a supplemental option for those who do not need a replacement handle or key cylinder.
Check first: The manufacturer calls for 3/8-inch (9 mm) clearance between the front sliding-door frame and the back fixed glass pane. Measure this space and review the installation instructions before ordering.
Buying Guide: How To Choose A Sliding Door Outside Lock
Do you need a complete handle set or a separate lock?
Choose a replacement handle set if the existing handle or mortise lock needs replacing and you want an outside key cylinder. Choose a standalone keyed lock if you only need an additional keyed component and have confirmed its mounting requirements. A security bar or hinge-style device can add a layer of security, but it is not a substitute for a keyed exterior lock.
Which measurements should you check?
Measure the distance between handle screw holes, door thickness, and the position and style of the existing lock. The featured replacement sets list 3-15/16-inch screw spacing, but their thickness ranges differ. Compare your measurements with the specific product requirements instead of assuming the parts are interchangeable.
Does door handing matter?
Several handle sets are described as reversible or non-handed, meaning they are intended for either left- or right-handed doors. Confirm that claim on the selected product and follow its installation directions. Also check that the existing door uses the same general mortise-latch arrangement.
Can a supplemental lock replace the outside key lock?
Not necessarily. The BurglaBar is described as an additional security device and does not include an exterior key cylinder. A security bar is also a separate type of door restraint. If outside key operation is essential, select a product explicitly described as having a key cylinder or keyed lock.
Frequently Asked Questions
What is an outside lock for a sliding glass door?
It is a lock that lets someone operate the door from the exterior, commonly through a key cylinder integrated into a replacement handle set.
How do I know whether a replacement handle will fit?
Measure screw-hole spacing and door thickness, then verify the existing lock style and position against the product’s listed specifications.
Are all sliding door locks reversible?
No. Some handle sets are specifically described as reversible or non-handed. Check the product details before buying.
Is a security bar the same as a keyed outside lock?
No. A security bar is a separate restraint, while a keyed lock is designed for locking with a key. They address different needs.
Can I install a keyed handle set myself?
The listed kits describe replacement steps using existing pre-drilled holes, but fit and installation depend on the door. Follow the product instructions and test the latch and key before final tightening.