Situations
Doors are rarely picked. They are more often levered at the edge opposite the hinges, and the timber around two short screws is what gives way. The order below is by effect: the cylinder, a second locking point, bolts let into the edge so nothing protrudes, and the screws that make all three worth having.
Everything on a front door is judged against one question: what happens when somebody applies a lever near the lock.
It is the part that gets attacked, and the attack is snapping — the barrel gripped and broken at its weakest section. A cylinder sized to finish flush gives nothing to grip.
Two locks at different heights spread the load across more of the frame, and a door forced at one point still holds at the other. It is the same reasoning as a multipoint lock, arrived at cheaply.
Bolts let into the edge of the door, flush, so there is nothing to grip and nothing to lever against. They also address the half of the door that is rarely reinforced — a leaf secured only at the lock still swings on whatever the hinges are screwed into.
Underneath all of it. The best cylinder in the world is bolted to a keep held by two short screws in a soft jamb.
Where the frame, the hinges and the lock all matter together, and the weakest of the three decides the outcome.
Where the cylinder's resistance to snapping and picking is the specific question.
Where a door that is awkward to lock gets left unlocked, which defeats everything else.
Where policies frequently specify a lock standard, and where meeting it is worth confirming.
| Your weakness | The fix | The note |
|---|---|---|
| Older cylinder | An anti-snap cylinder | The commonest attack |
| Weak frame | Frame reinforcement | Often more valuable than the lock |
| Hollow door | A solid door | Sets the ceiling |
| Glass by the door | Rethink the thumbturn | Reachable from outside |
Door locks fail from misalignment far more than from wear. As a door settles or swells, the bolt starts to catch, people stop fully locking it, and the security is lost long before anything breaks.
The front door is also an escape route.
30/30 mm (1.18 in) · anti-pick pins · emergency function · 5 reversible keys · code card
ABUS's everyday euro cylinder: special pins for pick and manipulation resistance, an emergency function that works with a key in the other side, and five reversible keys with a code card for reordering.
Best for: Replacing a builder's cylinder on a front door, at the smallest sensible price.
≈ $54
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
ABUS's additional rim lock: a thumbturn inside, a key outside, and a five-pin cylinder. Stated for doors 35 to 50 mm (1.38 to 1.97 in) thick with recesses up to 21 mm (0.83 in), and needing a 32 mm (1.26 in) round hole for the cylinder.
Best for: Securing the closing edge of a front door against levering, on a door of ordinary thickness.
Two concealed flush bolts · 150 mm (5.91 in) · 304 stainless · brushed finish · fits into the door edge
A pair of concealed flush bolts in 304 stainless steel, let into the edge of the door so that nothing protrudes. Prmape states bolts 150 mm (5.91 in) long overall, a brushed finish and stainless fixings.
Best for: A double door or a French door, where the passive leaf must be held top and bottom.
Stainless door chain · 200 mm (7.87 in) chain · spring button · fits timber and metal · inside only
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.
Best for: Opening a door to an unknown caller without opening it fully — and nothing more than that.
Longer screws in the existing strike plate, and it costs almost nothing. The frame splits around two 25 mm (0.98 in) screws long before any lock fails; 70 to 80 mm (2.76 to 3.15 in) screws through the jamb into the framing change the outcome and take ten minutes.
From the center screw hole to each face separately — 30/30, 40/50, never simply "80 mm (3.15 in)". Fit it so the short half is outside and nothing protrudes past the handle plate, because what protrudes is what gets gripped.
Not if the frame or the door is weak. Attackers go for the weakest of the three, and a strong lock in a soft frame changes little.
Often yes with permission, and a cylinder swap is reversible. The lease usually addresses it directly.
If a thumbturn can be reached through it, a broken pane becomes an open door. There are specific solutions and it is worth addressing.
Frequently yes, and policies often name a standard. Confirming before buying is easier than arguing after a claim.
Usually the door or frame has moved with the seasons. Adjusting the keep is the fix, and forcing the key is how cylinders break.
Designed for: Replacing a builder's cylinder on a front door, at the smallest sensible price.
Its main asset: Emergency function: it operates from outside with a key left in the inside
Its main gap: 30/30 is a short cylinder — it fits a thin door and not a thick one
Designed for: Securing the closing edge of a front door against levering, on a door of ordinary thickness.
Its main asset: Protects the closing edge specifically — the side a lever is applied to
Its main gap: Requires a 32 mm (1.26 in) hole bored through the door
Designed for: A double door or a French door, where the passive leaf must be held top and bottom.
Its main asset: Concealed: nothing protrudes, and there is no visible hardware to grip
Its main gap: Requires a mortice cut into the edge of the door — this is joinery, not a screwdriver job
Designed for: Opening a door to an unknown caller without opening it fully — and nothing more than that.
Its main asset: Stainless steel, so it does not rust in a damp hallway
Its main gap: A chain is a talking device, not a security device — it yields to a shoulder
$10
3 models
$17 – $32
4 models
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