Dead locks are popular in Winchester and across the UK. They boost security as either primary or secondary locks. Operated manually with a key, they secure firmly into a strike plate in the door frame. Compared to nightlatches, deadlocks offer much better protection against break-ins. Knowing the differences between deadlocks helps you pick the best lock for your needs.
Types of Dead Locks and Their Uses
3 Lever Dead Locks
The 3 lever deadlock provides basic security. It’s best suited for internal doors in Winchester homes. Common uses include bedrooms, storage cupboards, or utility rooms. These doors typically measure around 35mm thick, making 3 lever deadlocks ideal.
When to use: Internal, low-security doors.
5 Lever Dead Locks
The 5 lever deadlock offers stronger security than the 3 lever version. With additional levers, these locks are tougher to pick or bypass. They often come with extra features like anti-pick bolts, anti-saw bolts, and boxed strike plates. However, they’re not British Standard BS3621 rated, so they’re best for internal doors at least 45mm thick.
When to use: Internal doors needing higher security; not for external doors.
5 Lever British Standard Dead Locks (BS3621)
The 5 lever British Standard deadlock is the top choice for external doors in Winchester. Rated BS3621, these locks are recommended by insurers. They provide superior protection, featuring:
- Anti-pick and anti-saw bolts
- 20mm bolt throw into a solid steel strike plate
- Hardened steel plates to resist drilling
- Security curtain to prevent lock-picking
When to use: External doors, required for insurance compliance.
Checking Your Locks for BS3621 Standard
To quickly check if your locks meet the BS3621 standard, look for the British Standard kite mark. You’ll find it on the lock’s front edge near the bolt.
If you’re unsure or your locks don’t meet these standards, we recommend upgrading immediately. Our Winchester locksmith team provides professional installation, repairs, and replacements for all deadlock types.
Contact us today for advice or assistance—we’re here to keep your Winchester home secure.
