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How to use a door security bar

Updated: October 2026

How to use a door security bar is a short order: lock first, seat the yoke under the lever, get the rubber foot flat on the finished floor, then prove you can take the bar off from inside. The [door security bar comparison](/hub/door-and-window-security/door-security-bar) sets that pole against a small under-door plate. Peter F. wrote this on 20 October 2026 from amazon.co.uk extracts, the Master Lock 270D sheet, London Fire Brigade guidance and Ask the Police, with no lab test. A qualifying purchase can earn a commission at no extra cost to you.

How to use a door security bar is a short order: lock first, seat the yoke under the lever, get the rubber foot flat on the finished floor, then prove you can take the bar off from inside.

Our top picks

Amazon Basics Amazon Basics adjustable security bar, black

Best overall

Amazon Basics Amazon Basics adjustable security bar, black
9.0/10about £19.94
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Defender Defender adjustable door security bar HA00721

Rank 2

Defender Defender adjustable door security bar HA00721
9.0/10about £21.95
View offer
HOMGEN HOMGEN door security bar, 84–113 cm

Rank 3

HOMGEN HOMGEN door security bar, 84–113 cm
8.4/10about £21.37
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On this page
  1. 1.Check the swing and the floor first
  2. 2.Set the length and seat the yoke
  3. 3.Plant the foot and test the push
  4. 4.Take the bar off before you rely on it

Check the swing and the floor first

A handle-to-floor brace works on a door that swings towards you. If the leaf opens outwards, the lever moves away and the yoke has nothing to hold. A loose rug lets the foot walk, and Master Lock’s 270D sheet says to keep the bar off loose rugs. Laminate, lino, vinyl and wood are on Defender’s floor list, yet reviews on AceMining, Defender, Amazon Basics and HOMGEN still describe slip. Lock the existing lock before the bar goes on. Ask the Police, in Q1098, treats a security bar as something you use as well as the lock. If the frame shifts, or the multipoint lock will not throw, call a locksmith.

Set the length and seat the yoke

Measure from the finished floor to the underside of the lever. The pin holes are stepped. One AceMining review describes a lock near 53 cm and the next near 70 cm. The yoke has to sit under the lever while the foot can still land flat. Seat the pins when you are not leaning on the tube. Amazon Basics buyers report that the pins pop out if you rest on the bar. HOMGEN can feel loose at full extension. If the only fit is the last holes, the ranges are in the door security bar buying guide. A key in the cylinder, or a large thumbturn, cocks the yoke.
Amazon Basics Amazon Basics adjustable security bar, black

Testsieger

Amazon Basics Amazon Basics adjustable security bar, black
9.0/10about £19.94
View offer

Plant the foot and test the push

The rubber has to meet the floor as a flat pad. An edge-on foot walks as soon as the door is pushed, which AceMining reviewers describe. Master Lock’s 270D sheet says to tap the foot once the pins are in. On a Defender-style bar, set the length a little short and drive the foot home with your shoe. With the door unlocked, ask someone you trust to push while you watch the foot and the pins. If anything walks, stop and reset. A 250 kg line on Defender, eSynic or HOMGEN is a seller claim. When the push holds, lock the door again before you leave the bar up.

Take the bar off before you rely on it

From inside, kick the foot sideways or lift the yoke off the lever, then move the tube clear of the door. Practise that with the light off. London Fire Brigade says you should not alter a flat entrance fire door. In a house in multiple occupation, the escape door has to open from inside without a key that only someone else holds. A slider is a different fit, on the sliding door security bar page. Who each listing is for is on the best door security bar page. If the brace feels solid only once it is screwed on, ask a door fitter.

Common questions

Where does the fork go on a door security bar?
The fork sits under the lever, on the neck of the handle, not across the keyhole. The door has to swing towards you, so a push drives the lever into the yoke. On an outward-opening door the handle moves away and the fork cannot hold it. Clear a large thumbturn, and throw the lock first.
How do I set the foot of a door security bar?
Set the length so the rubber lands as a full pad, then tap or kick the foot until it is flat. An edge-on foot walks as soon as the door is pushed. Master Lock’s 270D sheet uses a tap after the pins are in. Drive a Defender-style bar home with your shoe, and stop if that bows the door.
What if the pins or the plastic caps fall out?
Seat the pins while the bar carries no weight. Amazon Basics reviews say they pop out if you lean on the tube. Caps that fall off in the box are an arrival check, not a reason to screw the bar to the door. If a spring leaves a Defender when you pull the fork off, refit it before you use the bar again.
What if a key is left in the lock?
Take the key out before you seat the yoke. A key in the cylinder, or a bulky thumbturn, stops the fork sitting square under the lever. Hang the key where you can reach it in the dark. The bar does not replace a BS 3621 lock. If the door shuts only with the key left in, that is a locksmith job.
How do I take a door security bar off in a hurry?
From inside, kick the foot off its line or lift the yoke clear of the lever, then move the tube away from the door. Practise that in the dark, with the door unlocked. Do not screw a bracket to a flat entrance fire door to speed the release. If you cannot drop the bar when you are tired, leave it off the escape route.
Should I test a door security bar from the outside?
Yes, once, with the door unlocked and someone you trust outside. You stay inside and watch the foot, the pins and the yoke. If anything walks, stop and reset. Do not kick a locked front door from the street, and do not treat a held push as proof against a determined attack. The bar is additional security, not a lock.

Related pages

Additional door lock

Door security bar

Best door security bar for a measured inswing door

Door security bar buying guide: swing, length, floor

Sliding door security bar: measure the patio track

Door security bar vs door jammer: which one to pack

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are the amazon.co.uk figures in the listing extracts. Defender’s amazon.co.uk page and the DoorJammer UK site still matched on 19 October 2026. A 250 kg or 400 lb line is a seller claim. PAS 24 is quoted only for the DoorJammer listing and the Secured by Design entry, not for the telescopic bars.

  1. Ask the Police Q1098: security door bar and patio anti-lift (retrieved 19 October 2026)
  2. GOV.UK Approved Document Q (retrieved 19 October 2026)
  3. BSI PAS 24:2022+A1:2024 (retrieved 19 October 2026)
  4. Secured by Design: DoorJammer entry (retrieved 19 October 2026)
  5. DoorJammer UK FAQ (retrieved 19 October 2026)
  6. NPSA patio doors technical supplement (retrieved 19 October 2026)
  7. London Fire Brigade: fire doors (retrieved 19 October 2026)
  8. Defender HA00721 on amazon.co.uk (retrieved 19 October 2026)