Feel Safe In Seconds
Our portable DoorJammers instantly turn inward-opening doors into barricades...
With 2 versatile options, the DoorJammer range provides instant, simple and effective door security options for inward-opening doors and prevents unwanted and forced entry in seconds.
THE ORIGINAL PORTABLE DOOR LOCKING DEVICE
✔ Award-Winning
✔ TSA Approved
✔ Police-Accredited
✔ Patented Design








How To Use

1
Insert the flat part of DoorJammer all the way under the door directly beneath the handle or where the handle would be

2
Twist the screw clockwise to extend the foot until it is firm against the floor

3
Pull the handle to check that the door is secure

The Original Portable Door Locking Devices
Thanks to a patented system of hinges and angles, force from outside the door is redirected downwards, wedging DoorJammer firmly into the ground.
The easy to use devices fit by hand and immediately work on almost any inward-opening door, even without a lock.
DoorJammers install in seconds without tools and is removable in a hurry - just pull the handle upward. The quick-release lifts DoorJammer away without fuss.
Bulk Order Discounts
Are you looking to buy multiple DoorJammers for a school or business? Contact us today to discuss available discounts for large quantity orders...
TWIN PACK DoorJammer: Lockdown
TWIN PACK DoorJammer: Lockdown
TWIN PACK
DoorJammer Lockdown - Award-Winning, Heavy-Duty Portable Door Security Barricade
Enhance your safety with DoorJammer Lockdown, the police-accredited, heavy-duty portable door security device engineered to transform inswinging doors into instant strongholds. Trusted globally by schools, offices, medical facilities, and public buildings for its reliability and rapid deployment.
Built with a patented steel design, DoorJammer Lockdown creates a strong physical barrier against forced entry in seconds. It works on almost any inswinging door - even if the door has no lock or handle - and installs quickly by simply turning the screw.
Why Choose DoorJammer Lockdown?
- Proven & Trusted – Award-winning and police-accredited for reliable door security.
- Versatile Protection – Perfect for schools, offices, businesses, and public buildings, adding an extra layer of protection during lockdowns and emergencies.
- Easy to Use – No tools required; installs in seconds.
- Fast Deployment in Emergencies – Designed in collaboration with emergency services, includes a quick-release function for immediate removal.
- Robust & Reliable – At 810g and 192mm tall, this XL model is twice the size and power of the standard Portable version - perfect for commercial and high-risk environments.
- Patented Stability – Advanced hinge-and-angle design redirects force downward, anchoring firmly on all floor types: carpet, tile, wood, laminate, etc.
DoorJammer Lockdown is ideal for emergency security in classrooms, offices or public spaces, can be rapidly deployed during lockdown scenarios and can be used as a temporary security aid in hospitality and healthcare environments.
This TWIN PACK includes 2 DoorJammer Lockdown DJ4s.
Important for proper use of the DoorJammer Lockdown:
- It needs to be set on a flat surface.
- No weather seals or protective strips - Many residential front doors will have a riser, flashing, weather stripping or sealing etc. that will impede the DoorJammer Lockdown or not allow it to fit properly. You will need to observe the condition of your front residential door if buying for that purpose.
- There needs to be a 3mm minimum clearance between the bottom of the door and the floor to fit the DoorJammer Lockdown.
- Designed for inswinging/inward-opening doors only.
Increase security and enjoy peace of mind with DoorJammer Lockdown - your door safety solution and door lock alternative.
Share this product
FAQs
Explore our frequently asked questions for more information on our DoorJammer portable door lock range.
Click the button below to see all questions.
Still unsure? Feel free to reach out to our team on +44 (0) 1424 239284 or salesuk@door-jammer.com

How much space is needed under the door to use DoorJammer?
How much space is needed under the door to use DoorJammer?
You will need a minimum of 3mm to fit DoorJammer. The maximum gap for DoorJammer is approximately 33mm and for Lockdown, it's 42mm.
Does DoorJammer fit to a uPVC door?
Does DoorJammer fit to a uPVC door?
DoorJammer requires a minimum 3mm gap under a door to fit - most uPVC doors do not have this gap.
Can I take my DoorJammer onboard a plane in overhead luggage?
Can I take my DoorJammer onboard a plane in overhead luggage?
Yes, DoorJammer is TSA-friendly, compact and lightweight.
What materials are used to make DoorJammer?
What materials are used to make DoorJammer?
We only use high-grade steel to achieve DoorJammer's incredible strength. Smaller parts and accessories are rubber and plastic.