Sash jammers add an extra locking point to uPVC doors and windows that open inwards. Swing the arm across the frame and the door or window can't be forced open. Two on the inside of the letterbox flap make a simple letterbox lock.
Please note: sash jammers only work on doors and windows that open inwards.
How many do I need?
1 for a small window
2 for a large window or a single door (top and bottom)
A sash jammer is a small swivelling arm screwed to the frame of a uPVC door or window: swing it across the opening sash and the door physically cannot be forced open, even if the lock is bypassed. It's one of the cheapest, most effective secondary security devices available.
Fit two per door — one high, one low on the opening side — so force is resisted at both ends of the sash. Windows normally take one on the opening edge, or two on larger sashes. They're inexpensive enough to do every accessible opening.
Yes — police crime-prevention teams commonly recommend them for uPVC doors because they defeat lock snapping and handle attacks: even with the cylinder destroyed, the jammed sash won't open. Use them alongside, not instead of, an anti-snap cylinder for layered security.
Screw the baseplate to the fixed frame beside the opening sash using the self-tapping screws provided, positioned so the arm swings across the sash face. Two screws, five minutes, no special tools — just check the arm clears handles and hinges before drilling.
Our own-brand Home Secure sash jammers are the product we built the business on — specified for UK uPVC profiles, tested daily by trade customers, and supplied with proper fixings. Order by 2pm for same-day dispatch.
