The best sliding back door lock depends on whether you want a portable security bar or a lock that attaches to the door. Adjustable bars are useful for blocking a sliding panel and can also fit some windows; the Summit Doorware lock offers a keyed option, while the WINONLY foot lock allows adjustable opening control. Measure your door or track before choosing, since fit requirements vary.
| Product | Best For | Key Detail |
|---|---|---|
| AceMining Security Bar | Wide doors and windows | Adjusts from 20.5 to 50 inches |
| Adjustable Bar with Rubber Tips | Travel and no-drill use | Adjusts from 17 to 50 inches |
| DIIG Security Bar | Non-slip bar support | Rubber tips and tension adjustment |
| Summit Doorware Lock | Keyed locking | Includes two keys |
| WINONLY Foot Lock | Adjustable opening control | Screw-in installation on the rail |
AceMining Adjustable Sliding Door Security Bar
Best for: Households looking for a wide-adjustment bar for a patio door or window. This bar extends from 20.5 to 50 inches and is made from high-strength steel with a one-inch diameter. The listed features state a capacity of up to 300 pounds of force.
An included extension bar and alloy connections support length adjustment. The bar is placed horizontally in the lower track, so it can act as a physical obstruction against opening the panel. It is also presented for window security, giving it more than one potential use.
Why it was selected: Its broad stated adjustment range and extension make it a flexible option when a fixed-length bar would not fit. Limitation: Measure the usable track space first, and make sure the lower track can accommodate horizontal placement.
Adjustable Security Bar with Rubber Tips
Best for: Renters or travelers who want a removable, no-drill security bar. The painted metal bar measures one inch in diameter and adjusts from 17 to 50 inches. Its listed features include rubber tips, a metal cotter pin, and assembly that does not require drilling.
The product information says installation can be completed in one to two minutes and recommends checking that the window or door width falls within the adjustment range. It is described for sliding doors and windows, and can be taken along when traveling.
Why it was selected: The no-drill setup and portability suit buyers who do not want a permanent installation. Limitation: It only fits openings within its stated range, so measure before ordering and confirm the bar can sit securely in the track.
DIIG Adjustable Sliding Door Security Bar
Best for: Buyers who want a removable bar with rubber tips and adjustable tension. The white, one-inch-diameter metal bar extends from 17.7 to 50.5 inches. The product description lists a load-bearing capacity of up to 300 pounds and a spray-painted finish intended to help resist rust.
Rubber tips increase friction at the contact points, while double nuts adjust tension. The bar is described as requiring no drilling, which can be useful for apartments or other situations where permanent changes are unwanted.
Why it was selected: Its long adjustment range and tension-adjustable, non-slip end design make it a practical alternative to a fixed lock. Limitation: The bar is a physical stop rather than a keyed lock; check the opening and track placement before relying on it.
Summit Doorware Keyed Patio Door Lock
Best for: Buyers specifically seeking a keyed sliding patio door lock. The listed product name identifies a patio door lock supplied with two keys. That makes it a different type of option from the three adjustable bars above, which block movement without a key-operated mechanism described in their features.
Why it was selected: A keyed lock may suit households that prefer a lock-and-key approach rather than placing a bar in the track. Limitation: The provided product information does not specify dimensions, installation method, or compatible door types. Verify fit and installation details before purchase.
WINONLY Sliding Door Foot Lock
Best for: Buyers who want to control how far a sliding door opens. This lock screws onto the top or bottom rail and can be positioned to set an opening width. The product description also lists use with some vertical and horizontal sliding windows.
Why it was selected: Adjustable positioning offers an opening-control feature that a full-length security bar does not provide. Limitation: This is not a no-drill option. The listing gives minimum fit requirements: track height greater than 1.26 inches, track width greater than 0.63 inches, and door frame width greater than 1.57 inches. Confirm all three measurements first.
Buying Guide: Choosing a Sliding Back Door Lock
Should you choose a bar or an attached lock?
A security bar sits in the track to obstruct the moving panel. It may suit renters or people who want a removable device, but it needs a suitable track and correct length. Attached locks offer a different approach: the Summit model is identified as keyed, while the WINONLY lock screws onto a rail and allows opening-width adjustment. Choose based on whether portability, a key, or controlled opening matters most.
How should you measure for fit?
Measure the opening or track where the device will sit, not just the overall door. Compare that measurement with the full adjustment range of a bar. For the WINONLY lock, check the listed minimum track height, track width, and frame width. Also consider whether hardware, trim, or the door frame could prevent secure placement.
What features matter for a security bar?
Look at material, diameter, length range, end design, and installation requirements. The listed bars are metal and have one-inch diameters; the DIIG and second bar specify rubber tips. The AceMining and DIIG descriptions provide stated force or load capacity, but those figures should not be treated as a guarantee for every door or installation. Correct fit and placement remain important.
Is a removable lock enough?
A bar or added lock can provide another layer of security, but product details alone cannot establish how secure an entire door system is. Check the door’s existing hardware and follow the device’s installation instructions. If you need access control with a key, compare the keyed Summit option with the removable bars and confirm the lock’s fit details with the seller.
Frequently Asked Questions
What is the best type of lock for a sliding back door?
It depends on the need: choose an adjustable bar for a removable obstruction, a keyed lock for key-operated locking, or an adjustable rail lock if controlling the opening width is important.
Do sliding door security bars require drilling?
The AceMining, second adjustable bar, and DIIG listings describe no-drill placement. The WINONLY foot lock uses screw-in installation.
Can these locks also be used on windows?
Several bar listings describe window use. Check the opening measurement and track shape before using a bar on a window.
How do I know whether an adjustable bar will fit?
Measure the usable opening where the bar will sit, then compare it with the product’s stated minimum and maximum length.
Does the WINONLY lock fit every sliding door?
No. Its listing specifies minimum track and frame dimensions. Measure those areas and verify the lock’s placement before purchasing.