Ground-floor windows are the entry a locked door redirects people to · review
The cheapest way onto this shelf, from the only maker here that publishes a line drawing to check the fit against.
The conclusion Five dollars forty for four is the cheapest entry on this shelf, from the one maker that publishes a line drawing so you can check the rail before ordering rather than after. Keyless, reversible, no drilling, and the closed and ventilated positions both stated plainly. Four locks is the smallest pack here and eighty-three cents a lock is available from the twelve-pack — and note that the identical lock in white costs nearly three times as much.
No liner. No grade. No force figure.
Which is the one thing this listing has that the others do not.
All three makers on this shelf tell you to measure your track. Only this one gives you something to measure against.
A dimensioned line drawing shows the jaw opening and the body profile — how window hardware has always been specified, and it settles the question before the parcel arrives.
If the track is near the limit, that is the difference between four locks that fit and four that do not.
And it describes everything on this shelf.
A track clamp stops a sliding sash being slid or levered along its rail. That is how a sliding window is opened from outside.
It does nothing about the glass, the catch or the frame.
Prime-Line calls it an added layer of protection rather than a lock. None of the three products here publishes a grade, a force figure or a test standard — and none of them claims to.
Which is what matters in a rental.
No drilling. No replacement of existing window hardware. The clamp comes off and the frame is as it was.
For paint.
Prime-Line sells this same lock in white under a different reference: same four-pack, same 1/8-inch rail, the same five bullets to a word — at nearly three times the money.
On a white vinyl frame the finish shows, and some will pay for it.
Natural aluminum shows on white. So does a dented track, which is the argument for the lined clamp on this shelf rather than for a repaint.
On sale at around $5 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
| Fitting | Window rails up to 1/8 in (3.2 mm) wide, stated, with an instruction to verify the measurements before purchase and to review the LINE DRAWING and rail dimensions before ordering. It is the only maker on this shelf to point you at a dimensioned drawing rather than a sentence |
|---|---|
| Operation | A thumb turn screw tightened onto the window track, with no tools and no permanent modifications — stated. Keyless, which this shelf's buying tip makes a safety argument for: there is no key to be in a drawer downstairs |
| Ventilation | Secures horizontal sliding windows in the closed position OR a partially open position for controlled airflow — stated twice on the page. This shelf's introduction calls that the compromise worth understanding, and this listing is the clearest statement of it on the shelf |
| Material | Durable aluminum with a natural finish, stated. No liner, so metal tightens onto the track. The same lock is sold in white under a different reference at nearly three times the price |
| Frame | A rail clamp: it tightens onto the track and fixes to nothing. This shelf's introduction says aluminum frames often take only a clamp, which is this — and it will not serve a timber casement or a vinyl reinforcement channel |
| Supplied | Four locks at five dollars thirty-nine — about a dollar thirty-five each, and the lowest total price on this shelf |
| Profile | A low-profile appearance, stated. On a window that is looked at every day rather than secured once, that is worth something |
| Reversibility | No permanent modification, stated twice: nothing is drilled and the existing window hardware is not replaced. For a rental or a leasehold apartment that is the deciding property |
| Security | Described as a secondary security measure and an added layer of protection — the listing is careful not to claim more. No grade, force figure or test standard, as on every lock here |
| Amazon reference | B00BAFIQF0 |
| EAN | 0049793098191 |
Because every maker on this shelf tells you to measure your track and only this one gives you something to measure against. Prime-Line says to review the line drawing and rail dimensions before ordering — a dimensioned diagram showing the jaw opening and the body profile, which is how window hardware has always been specified and which settles the question before the parcel arrives. The other two listings give a maximum rail width in words. If the track is near the limit, the drawing is the difference between four locks that fit and four that do not.
Not at the price difference. Prime-Line sells the same lock in a white finish under a different reference, with the same four-pack, the same 1/8-inch rail and the same five bullets to a word — at nearly three times the money. On a white vinyl frame the finish is visible and some will pay for it; the honest comparison is that it is paint. Natural aluminum on a white frame shows, and so does a dented track, which is the argument for the lined clamp on this shelf rather than for a repaint.
That Prime-Line is being accurate. A track clamp stops a sliding sash being slid or levered along its rail, which is how a sliding window is opened from outside — and it does nothing about the glass, nothing about the catch, and nothing about the frame. The listing calls it an added layer of protection and a secondary measure rather than a lock, which is the correct description of every product on this shelf. None of the three publishes a grade, a force figure or a test standard, and none claims to.
Between security devices of the same category and nearby price. Shown: what they all state. A half-filled column says nothing.
| Model | Price | Operation |
|---|---|---|
| PRIME-LINE U 9819 sliding window security lock, 1/8 in rail, 4-pack | $5 | A thumb turn screw tightened onto the window track, with no tools and no permanent modifications — stated. Keyless, which this shelf's buying tip makes a safety argument for: there is no key to be in a drawer downstairs |
| NUK3Y PRODUCTS K3 DD04-10 sliding window security locks, aluminum, 12-pack | $10 | Tightened with a supplied key inserted into a hole in the body — stated, with no additional tools required. That key is a TIGHTENING TOOL rather than a lock key, and the distinction is the whole character of this product: it cannot be loosened by hand, which no thumbscrew clamp on this shelf can say |
| Shop Square LLTR10 adjustable aluminum window stoppers, 10-pack | $16 | A thumb screw, tightened by hand with no tools — stated. Keyless, which this shelf's buying tip makes a safety point about: a window lock whose key is in a drawer downstairs is a window that stays locked in a fire. A thumbscrew has no key to lose |
| ABUS FTS3003 | $60 | Locks by closing; key needed only to open |
Details checked on October 8, 2026.
Four sliding windows, checked against the drawing first, with nothing permanent done to the frame
Amazon reports what buyers took in the month before this page was last checked: at least 3,000.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
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.
Hinge-side lock · bolt rated to one metric ton of pressure · ABUS level 10 · 123 × 42 × 86 mm (4.84 × 1.65 × 3.39 in)
A hinge-side security bolt for inward-opening windows — the side almost nobody reinforces. ABUS states the bolt protects up to one metric ton of pressure and rates it at security level 10 on its own scale.
Best for: The half of the window that every other lock in this hub ignores.
≈ $68
Bolt lock, inward-opening windows · 4-pin cylinder · keyed alike · ABUS level 5 · key to open only
A bolt-action window lock for inward-opening windows and French windows. ABUS states a four-pin cylinder, keyed-alike operation, and a mechanism that locks by pushing — the key is needed only to open it.
Best for: Ground-floor windows that get locked every night, where hunting for a key each time would end the habit.
≈ $60
Five window locks · push-button, no key · M5×50 screws supplied · white
The five-unit box of BASI's keyless window bolt, for a house with more accessible windows than a three-pack covers. Same push-button mechanism and same 50 mm (1.97 in) screws.
Best for: A house with five or more reachable windows — usually a front, a back and a side.
