Difference between 2.5" and 3" mortice dead lock

ey143

Hi

Is one better than the other in terms of security?

If I'm installing a fresh new lock (not replacement) and door width and frame is not an issues, which 5 lever mortice deadlock to get? I don't get why there are two sizes.

Thx.

Biggles

There are several different sizes, to suit different doors.

The security is down to whether they are BS3621 or not.

ey143

Assuming all sizes are BS3621 - any difference in lock security or strength? Does bigger = better/stronger?

joinaman

Simple answer == No


Lock sizes differ due to the difference in door stiles/framework


Just make sure it has a BS number with hardened pins/bolt Don't bother with the anti drill plates either, unless you need this type for insurance, most 5 lever standard locks are more than adequate for household doors and insurances
It is not just the lock that needs to be strong, also the door stile as well. Most doors are broken into by kicking/ramming so the lock stays intact and the door itself breaks apart
If you want better security than just the lock, ask your local ironmongers for plates to bolt through the door stile around the lock and also long plates for fixing down the internal face of the door frame to prevent the frame splitting away


I assume your lock is wanted for a timber door? otherwise a British standard snap cylinder lock will be adequate

ey143

Correct wooden door. I've just ownership of a new (not new build) property and the door and frame is **it. There is only a single night latch and both else and that too the latch guard thingy on the inside is wobbling. I can push the front door and see it move which means it is not secure.

Problem is all of this is temporary as we are gutting out the place which is still set in the 1980s period. All the new locks I put on are going to be temporary as I plan to replace and move the front door.

Alarm will go in but just confused about the lock size, but cleaner now. Seems the ERA Fortress and Union 2134E are suitable for my needs then - both prices around £18 on amazon.

Thx.