Best Window Locks & Latches AI pick

Chosen by an AI model from its trained knowledge, with its reasoning.

AI pick (brand): Prime-Line

Prime-Line covers the widest range of replacement sash locks, sliding-window locks and latches, matched to common window hole spacings and styles.

Not for: Owners of premium-brand windows who should first order the exact OEM part from the window manufacturer.

Match the window type: Sash (cam) locks are for double-hung windows, sliding windows need track or thumbscrew locks, and casements need their own handle-and-keeper hardware. Locks are not interchangeable between window operating types.
Screw hole spacing: Measure the center-to-center distance of the existing mounting holes and match it exactly. Mismatched spacing means drilling new holes in the sash, which can weaken vinyl frames.
Handing: Check whether the replacement lock or keeper is left- or right-handed for the window it goes on. A wrong-hand lock will not engage its keeper.
Frame material: Use hardware rated for vinyl, wood or aluminum frames as appropriate. Screws and footprints differ, and vinyl strips out easily.
Ventilation stop: If you need a partially open locked position, choose a lock or stop that allows a limited opening. It lets you ventilate while preventing the window from being opened wide.

Prime-Line: Broad catalog of replacement window locks and latches.
Defender Security: Security-focused sliding window and door locks, sold under the Prime-Line umbrella.
Andersen: Buy OEM replacement locks if you have Andersen windows.
Pella: Buy OEM replacement hardware if you have Pella windows.

No, a sash lock only keeps the window shut, so use window stops, opening limiters or proper window guards for fall prevention.