The most complete override locking system on an anti-ligature lockset, our 5-way mechanical SOS lockset provides five override methods to ensure you gain access. 

In the most common barricade scenario, the staff key dominates the internal turn/pull, ending the barricade quickly and simply.  It also contains additional emergency override methods to overcome determined barricades. We hope you rarely use them, but when you do, they might just save a life. 


NB: Our 5-way SOS (Staff Override System) was previously referred to as our twintech/ secondary override system. 


Watch the video

1. Key

The lock and the internal turn/pull operate independently, so the key always dominates. It’s a direct mechanical override, so there’s no geared cylinder to disengage the turn/pull or clutch mechanism involved.

2. Keyway

Concealed backup override directly turns the spindle, allowing entry if keyway is blocked with foreign objects, like chewing gum or paper.

3. Turn leverage

T-bar emergency tool provides superior leverage to rotate the turn/pull, even if the service user is stronger.

4. Spindle

Spindle shears under heavy resistance, ensuring entry if turn/pull is immobilised. So even in the most serious barricade attempts, where the service user attempts to jam the turn/pull with their bed or body, swift access is achieved without lockcase damage.

5. Pull advantage

T-bar provides significant power advantage to pull the door open – offering better grip than an anti-ligature handle and foiling attempts by a service user to hold the door shut.

Lifeline option

Available with Lifeline closed keyway

We believe prevention is better than cure. 

That's why our 5-way SOS locksets are available with Lifeline closed keyway locks.  Operated by staff-only keys, they’re designed to stop foreign objects jamming the keyway – minimising the chances of a determined barricade attempt and reducing the need to use the emergency override procedure.

Plus locks using Lifeline can be unified, providing one-key access for staff to operate all the locks – door, vision panel, anti-barricade stop and window – with a single key.  This eliminiates the complexity of chosing the right key in stressful situations.





Limitations of alternatives


Clutch cylinders

Clutch cylinders

When a service user holds the internal turn/pull to create a barricade, the catch is designed to slip at a higher torque. Operating on a spring and ball-bearing mechanism, the key then turns and unlocks the door.

Over time, however, doors moveexpand or distort, limiting clutch effectiveness and making entry times longer in stressful situations.

Wear and tear can also cause the clutch to permanently slip – trapping service users inside and causing distress and fire safety issues.

Geared cylinders

Geared cylinders

When the key is put into a geared cylinder, it mechanically disengages the internal turn/pull, allowing the door to be opened.

However, service users can easily rotate the turn/pull past its maximum closed position, preventing the key fully engaging. Although the key can eventually be forced home, it can damage the cylinder and the key may snap, causing risk of injury and prolonging the barricade because of a blocked keyway.

Issues also arise in rehabilitation or step- down units, where service users may have their own key. This can be inserted into another service user’s lock, disengaging the turn/pull and locking them inside, resulting in anxietydisruption and fire safety risks.

Square drive override

Square drive override

Square drive mechanisms are sometimes used on anti-barricade locksets to unlock the door when the keyway is blocked. However, the small square drive key doesn’t always provide enough turn leverage – allowing a strong service user to prolong a barricade by tightly holding or wedging the turn/pull.

Because the square drive key simply pulls out, it provides no pull advantage or improved grip to open a door outwards.

Plus the insecure square mechanism can easily be rotated – with two spoons, for example – minimising security and creating privacy concerns. Circular shaped mechanisms can reduce this particular risk.



Case study: St Andrew's Healthcare


Opened in Northampton in January 2017, FitzRoy House was purpose-built to provide residential care for up to 110 children and adolescents on 11 wards. An entirely new build, it was designed in partnership with the young people, setting new standards for Mental Health with an emphasis on welcoming, friendly and nurturing environments.  

The medium-secure unit serves a diverse range of needs, and is home to some of the UK’s most complex Mental Health issues. Creating a safe and secure environment was, therefore, a priority – with a homely, welcoming feel also vital.  

With such a delicate balance between aesthetics, safety and security, the designers looked to our 5-way SOS (Staff Override System). Combining multiple override functions, it gives staff peace of mind, knowing they have permanent access to rooms, regardless of keyway damage or tampering.  

The result? Staff can protect the vulnerable youngsters in their care, yet still address the challenging realities of everyday Mental Health environments.

Lockset builder




5-way SOS locksets are designed to ensure clinical staff can always gain room access – giving peace of mind and keeping service users safer.

Because of the vital access that locksets provide, selecting the right lockset, lock option, and handle and backplate for your project is critical.  That's why we've created our lockset builder.



Glasgow office

Level 4, Skypark 3
14 Elliot Place
G3 8EP

t: 0330 058 0988

Blackpool office 

Unit 8 Bankfield House
250 Bristol Avenue



© Safehinge Primera 2018.  Design By Submarine. Development By Crocodiles
Safehinge Primera is a trading name of Safehinge Limited (SC304496) and Primera Limited (03708136)