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Window Sash Lock (2-Pack)
Window sash lock, set of two

Window Sash Lock (2-Pack)

The small lock that does the job the latch won't.

$14.99One-time · free tracked shipping
  • Pins the window where you want itTighten the screw and the sash cannot move.
  • Fits double-hung and sliding windowsClamps to the track or frame, no special window needed.
  • Lock shut or at a vent gapAir when you want it, locked when you don't.
  • Two in a packDo a bedroom and a bathroom window in one go.
Free tracked shipping 30-day returns Tested before shipping
Window Sash Lock (2-Pack) $14.99

The latch isn't a lock

Most window latches hold the window closed. They don't lock it.

The standard crescent latch on a double-hung window keeps it from rattling, but it can be slipped from outside with a thin blade, and it does nothing to stop the sash being forced up from below.

A sash lock clamps to the frame and pins the window in place. Tighten it down and the sash cannot be lifted or slid, whether you set it fully closed or open a few inches for air.

A latch keeps a window shut. A lock keeps it shut on your terms.
2pack
two windows
0tools
thumb-screw fit
2modes
shut or vented
4.5/5
owner rating
Set it and forget it

Tighten once, and the window stays put.

Clamp it to the frame above the lower sash to stop the window being raised, or set it to leave a safe gap for air that cannot be pushed wider from outside.

No part of it relies on the flimsy factory latch, so it adds a second, sturdier hold the moment it is on.

Double-hungSlidingShut or ventedNo drilling
Tool-free

Clamp it on in seconds.

1

Pick the spot

Choose where you want the sash to stop, shut or vented.

2

Slide it on

Fit the lock onto the frame or track at that point.

3

Tighten

Turn the thumb-screw until it grips firmly, no tools needed.

4

Test it

Try to open the window and confirm it holds.

No drilling, no marks. It clamps on and twists off whenever you like.
Renter-friendly

A sturdier lock that leaves no trace.

Because it clamps on with a thumb-screw and nothing is drilled, it works in any rental and comes off clean, while giving you a hold the original latch never had.

Layer your defense

A pinned window, and an alarm on the glass.

The sash lock stops the window being lifted or slid. The TremShield Alarm sticks to the same pane and sounds at 125dB the moment it is touched.

See the alarm
A pinned window, and an alarm on the glass.
Good to know

Questions, answered calmly

It suits double-hung and sliding windows. It clamps to the frame or track rather than needing a particular latch type.
No. It tightens with a built-in thumb-screw, so it goes on and comes off by hand.
Yes. Position it to allow a fixed gap and the window vents while staying locked against opening further.
It grips with a padded thumb-screw and no drilling, so it leaves no holes and lifts off clean.
One per window is enough to pin it. The two-pack lets you secure two windows, and you can add more on larger openings.

From the security guide

How to Burglar-Proof Your Windows (Without Bars on the Glass)

A calm, complete guide to making your windows secure but still livable: the right lock for each window type, how to vent safely for air, ...

Read the guide →

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