A security screen door that slams usually needs its closer turned towards slower, and two closer kits sold in Australia for hinged screen doors, Lockwood's 404 and Lane Security's adjustable closer, each carry their own speed adjuster for exactly that. Lockwood's 404 closer adjusts by rotating the closer body; Lane Security's adjustable closer adjusts with a screw. Both makers start from the same rule, though: the door has to open and close freely on its own before the closer goes on.
8 sections, a comparison table and 6 questions, about 10 minutes
This guide covers what the closer does on a hinged security door, how to slow a door that slams, what to check when it stops short of the latch, why that final close matters on a three point lock, and when the fix is a new closer kit, a hinge repair or a call to a repairer.
The short answer: slow the closer, but check the door swings freely first
To stop a security screen door slamming, find the closer's speed adjuster and turn it a little towards slower, then test the door and repeat. On a Lockwood 404 you rotate the main body of the closer following the arrows marked on it. On a Lane Security adjustable closer you turn the adjusting screw clockwise to slow the door down.
Before you touch the adjuster, check the door itself. Lockwood says to ensure the door closes freely before a closer is installed, and Lane Security says to make sure the door opens and closes freely. A door that rubs, drags or springs back by hand will fight any closer, and turning the speed up only hides the fault.
If slowing the closer then leaves the door short of the latch, don't just wind it faster again. That pattern usually points at the swing, the strike plate or the closer itself, which the sections below sort out one at a time.
What a closer does on a hinged security door
A screen door closer is a tube that pulls the door shut after you let go, mounted between a bracket on the door and a bracket on the hinge side of the frame. Lockwood describes its 404 as a hydraulic closer that suits hinged screen and security doors up to 29 kg, and the kit includes the closer, a jamb bracket, a door bracket, a connecting pin and a hold-open washer.
Where the closer sits depends on which way the door swings. Lockwood says that for normal outward opening doors, the closer must be installed on the inside, at the hinged end of the door, and that for inward opening doors the closer goes on the outside. Its maximum door opening angle is 90 degrees.
The closer has two jobs on a security door. It controls how fast the door swings shut, so it doesn't bang, and it has to carry the door the last few millimetres into the latch. A good adjustment balances the two.
Door slams: turn the speed adjuster towards slower
Slowing a slamming security door is a small, repeatable adjustment, and both makers' instructions treat speed adjustment as part of fitting. Work in small turns, because a closer set far too slow can stop the door short of the latch. The steps below suit both the rotating body type and the screw type.
Open the door and check the hold-open washer on the rod is not engaged, so the closer can run its full stroke.
Find the adjuster. On a Lockwood 404 it's the closer body itself, with arrows for faster and slower. On a Lane Security adjustable closer it's the adjusting screw.
Make a small turn towards slower: rotate the Lockwood body following the slower arrow, or turn the Lane screw clockwise.
Open the door fully, let it go and watch it close without touching it.
Repeat in small steps until the door closes gently but still latches by itself.
If the door now stops short, back the adjustment off a little towards faster and test again.
If turning the adjuster changes nothing, stop adjusting and see the replacement section below.
Door stops short of the latch: check the washer, the swing and the strike
A security door that won't close completely is usually held back by one of three things: the hold-open washer, the door's own swing, or the strike plate. Check them in that order, because the first two are free to check.
The hold-open washer is designed to keep the door open. Lane Security's instructions describe placing it where it will hold the rod out and the door open, or moving it so the rod can close freely. A washer that has slipped into the hold position stops the closer working at all.
Next, unhook the closer from the door bracket and swing the door slowly by hand. If it binds or drops with the closer off, the closer isn't the problem. If it swings freely but bounces off the strike, the strike needs attention. Austral Lock's care sheet for its Elegance XC lock says to wipe the strike plates quarterly with a soapy rag, to remove built up debris and to prevent bouncing of the door.
Self latching also depends on how the closer was set up. Lockwood's fitting steps pre-load the closer with the rod extended to allow the door to self latch, so a closer refitted without that step may never quite finish the close.
Security screen door closer symptoms, likely causes and where each becomes a repair
What the door does
Likely cause
Safe owner check
Where it becomes a repair
Door slams shut
Closer set too fast
Turn the adjuster a little towards slower and retest
The adjuster changes nothing
Door stays open and won't close
Hold-open washer engaged on the rod
Move the washer so the rod runs freely
The rod won't move or is bent
Door stops a few millimetres short
Closer too slow, or a dirty or misaligned strike
Speed up slightly, wipe the strike plate
The strike needs packing or moving
Door bounces back off the frame
Debris on the strike plate
Clean the strike plate
It still bounces with the strike clean
Door binds even with the closer unhooked
Hinges, hang or frame
Watch where the door rubs as you swing it
If tightening a plainly loose hinge screw doesn't fix it
Security screen door closer symptoms, likely causes and where each becomes a repair
Door slams shut
Likely causeCloser set too fast
Safe owner checkTurn the adjuster a little towards slower and retest
Where it becomes a repairThe adjuster changes nothing
Door stays open and won't close
Likely causeHold-open washer engaged on the rod
Safe owner checkMove the washer so the rod runs freely
Where it becomes a repairThe rod won't move or is bent
Door stops a few millimetres short
Likely causeCloser too slow, or a dirty or misaligned strike
Safe owner checkSpeed up slightly, wipe the strike plate
Where it becomes a repairThe strike needs packing or moving
Door bounces back off the frame
Likely causeDebris on the strike plate
Safe owner checkClean the strike plate
Where it becomes a repairIt still bounces with the strike clean
Door binds even with the closer unhooked
Likely causeHinges, hang or frame
Safe owner checkWatch where the door rubs as you swing it
Where it becomes a repairIf tightening a plainly loose hinge screw doesn't fix it
A door that does not latch leaves a three point lock open
On a security door, a closer that stops a few millimetres short is a security fault, not just an annoyance. The National Security Screen Association (NSSA) says a compliant security door almost always has a 3-point lock, which secures the door at the top, middle and bottom. Those bolts can only do their job if the door is pulled fully into the frame first.
Austral Lock's troubleshooting for its Elegance XC lock shows how this plays out. A door that won't lock or won't stay closed indicates the auxiliary bolt isn't being tripped as the door closes, and the fix is a gap between door and strike plate of no more than 3 mm, made by packing the hinges or the strike plate. Austral Lock also says to operate the lock with the door open first; if it works correctly, there's a fitting problem.
So after any closer adjustment, close the door with the closer alone and then check the lock catches at every point. Our guide to a security screen door lock not working covers the lock side of that check.
Closer damaged or no longer holding: replace the whole kit
When the speed adjuster no longer changes how the door closes, or the closer, rod or brackets are bent or damaged, the fix is a replacement closer rather than more adjustment. Both makers are clear on how that replacement is done. Lockwood says that when replacing an existing door closer, all parts should be replaced, including the door and jamb mounting brackets. Lane Security says the same: replace all parts, including all mounting brackets and jamb brackets.
That matters because the new closer's geometry depends on its own brackets. Lockwood positions its jamb bracket 40 mm down from the frame head, with a gap of 12 to 25 mm between the door and the bracket. It fixes the door bracket through a slot first to allow horizontal adjustment, then adds a second screw once the closer operates correctly. Mixing a new closer with old brackets skips that setup.
A closer kit change involves drilling the door and the frame, so treat it as fitting work on a security door rather than a quick swap.
When the hinges or frame are the real problem
If the door slams, stalls or springs open even after the closer is adjusted, test the door with the closer unhooked. A security door that still drags, sits crooked or binds by hand has a hang problem, and no closer setting fixes it. Both closer makers start their instructions from a door that opens and closes freely, so the hang comes first.
Signs worth checking for are a fresh scrape on the sill, a gap that's wide at the top on the lock side and tight at the bottom, or a lock that turns easily with the door open but fights you with it shut. Our guide to security door hinges explains how to tell loose screws from worn hinges or a moving frame.
Near the coast, look at the closer brackets and screws too. The Australian Stainless Steel Development Association (ASSDA) says salt significantly increases the conductivity of water, so galvanic corrosion between different metals is normally more severe near the coast. A corroded bracket screw is worth checking and replacing.
Adjust, replace or call for a repair
The owner's side of a closer fault stops at the adjuster, the hold-open washer, cleaning the strike plate and unhooking the closer to test the swing. Moving brackets, re-drilling, packing hinges or strike plates and fitting a new closer kit are fitting work. For installing a whole security door in Queensland, the QBCC lists fabricating and installing security screens and doors within the scope of its glass, glazing and aluminium licence class, and the NSSA recommends a security door be installed by an NSSA member rather than DIY.
The NSSA also warns that compliant doors are made and installed to very tight tolerances with specialised fixings, and that a screen can be made to operate without providing proper security. A door that swings shut again after a quick fix isn't proof that all three lock points engage.
We repair security doors onsite, including replacing door closers, hinges, triple locks and patio bolts, and our doors are made to measure in Cairns if one is past saving. See what a visit covers on our onsite repairs page, check the areas we serve, or request a quote.
Questions we get asked
Why does my security door slam shut?
Usually because the closer is set too fast. Find the speed adjuster and turn it a little towards slower: on a Lockwood 404 you rotate the closer body following the arrows, and on a Lane Security adjustable closer you turn the screw clockwise. Test after each small turn. If the adjuster changes nothing, or the door also drags by hand, the closer or the hinges need a repairer.
Why won't my security door close all the way?
Check three things in order. First, the hold-open washer on the closer rod may be holding the door open. Second, unhook the closer and swing the door by hand: if it binds, the hinges or frame are the cause. Third, a dirty or misaligned strike plate can make the door bounce back. Austral Lock suggests wiping strike plates quarterly with a soapy rag to prevent bouncing.
Can a closer be added to a security door that never had one?
Yes, if the door suits the closer. Lockwood rates its 404 for hinged screen and security doors up to 29 kg, with a maximum opening angle of 90 degrees. It fits on the inside at the hinged end of an outward opening door, or on the outside of an inward opening one. The door must also close freely before fitting, and the brackets need room on the frame.
Does a security door need to latch to be secure?
Yes. The National Security Screen Association says a compliant security door almost always has a 3-point lock, securing it at the top, middle and bottom, and those bolts need the door fully closed to engage. On Austral Lock's Elegance XC, a door that won't stay closed means the auxiliary bolt isn't being tripped as it shuts. A closer that stops short leaves the door unsecured.
Why do closer screws and brackets corrode near the sea?
Salt in the air speeds up corrosion where two different metals meet. The Australian Stainless Steel Development Association says salt significantly increases the conductivity of water, so galvanic effects are normally more severe near the coast. It adds that plastic strips, washers or sleeves separating the metals stop galvanic corrosion. A corroded closer screw is worth checking and replacing.
Do you replace security door closers in Cairns?
Yes. We repair security doors onsite around Cairns, including replacing door closers, hinges, triple locks and patio bolts. When you book, tell us whether the door slams, stops short or drags, and send a photo of the closer and its brackets if you can. If the door itself is past repair, our doors are made to measure and manufactured in Cairns.
Where this comes from
The published sources this guide draws on, and the date each one was checked.
