Most doors fail at the frame, not at the lock · review
A stainless steel door chain with a reinforced link and a spring button, operated only from inside. SAYAYO states 200 mm (7.87 in) of chain, a 123 mm (4.84 in) main plate, and a complete screw set.
The conclusion A conversation device fitted with better screws than it came with. Do not mistake it for a lock.
A door chain does one job well and is regularly sold as doing another. It lets you open a door far enough to see and speak to somebody without letting them in. It does not resist force, and no chain at this price does.
Not the chain. The screws. Most door chains ship with short screws that anchor into the soft lining of a door frame, and that lining splits under a shoulder long before a stainless link does.
The fix costs nothing: replace them with 70 to 80 mm (2.76 to 3.15 in) screws that reach through the lining into the structural stud behind it. That single change does more than any upgrade in this hub, and it applies to strike plates and hinges as well.
It only works from inside. A door cannot be left on the chain while you are out, which is what people occasionally imagine. It is a device for being at home and answering the door.
Stainless steel, so a hallway that gets damp does not leave a rust stain down the paintwork in two years, and a spring button that works with one hand while the other holds the door.
Anybody who opens the door to callers they cannot see first, and who is willing to spend two minutes on better screws.
Not found on the American Amazon store, where the buy link falls back to a local search rather than to a page that does not exist.
Prices and availability are what Keepa reported on the date this page was updated; both move.
| Material | Stainless steel, reinforced chain, stated by SAYAYO |
|---|---|
| Chain length | 200 mm (7.87 in) |
| Plates | 123 × 22 mm (4.84 × 0.87 in) and 62 × 22 mm (2.44 × 0.87 in) |
| Operation | Spring button, from inside only |
| Supplied | Complete screw set |
| Finish | Black |
| Doors | Wood and metal, any position or angle on the frame, left or right |
| Use | Also stops a child or pet opening the door by accident, stated by SAYAYO |
| Amazon reference | B076GWTZQG |
| EAN | 0766330595318 |
No. A chain lets you speak to a caller through a gap and see who they are; it does not resist a determined shove, and the screws holding it are the weak point long before the chain is. Use it for what it is — a way to talk without opening — and do not treat it as a lock.
Replace them. SAYAYO does not state their length, and screws with this kind of hardware are often short and anchor into the door lining rather than the structural frame behind it. Longer screws, 70 to 80 mm (2.76 to 3.15 in), reaching into the stud, cost almost nothing and are the single most effective change you can make to any door hardware.
With care. vinyl frames have a steel reinforcement channel that must be found, and screws into plastic alone will pull out immediately. If you cannot locate the reinforcement, a chain on that door is decoration.
7.2/ 10
A conversation device fitted with better screws than it came with. Do not mistake it for a lock.
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom. Listed is not the same as in stock — availability changes daily.
Details checked on September 2, 2026.
Opening a door to an unknown caller without opening it fully — and nothing more than that.
Specifications: the manufacturer sheet for home security products and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Rim lock with thumbturn inside · key outside · 5-pin cylinder · doors 35–50 mm (1.38 to 1.97 in) · 32 mm (1.26 in) bore
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Best for: The same job as the 2110 on an entrance door, where the inside hardware should stay white.
≈ $115
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Best for: An apartment door that has one lock and needs a second, without touching the existing one.
