A brief introduction to the Willenhall CT12 7 lever safe lock

A brief introduction to the Willenhall CT12 7 lever safe lock

Note:
This article does not include drill points or explicit instructions on how to pick this lock – as with locks that are new to you, it is best to get hold of one or two, take them apart and see how they work, and on the bench work through the best opening method for your own abilities.

[dropcap]H[/dropcap]ere we have probably the most basic safe lock available.  Commonly found on low grade safes and gun cabinets as it has no security ratings such as ENV1300 or VdS.  Also very popular on underfloor safes, and for this reason, if you are making a 2 in 1 for this lock, it is worth using a longer than standard pick for ease of use in the deep neck of floor safes.

There are several versions of this lock, according to the Willenhall website, the standard deadlock, a slam lock, flanged and nozzle versions, as well as a case that takes a standard euro profile cylinder.

CT12 non-key retaining 7 lever safe deadlock with 3 position keyhole

Here we are looking at the most common lock, the deadlock.

This can be mounted in 1 of 3 positions, as shown by the keyhole. Not all caps have all the options available.

Case sizes are 60.3mm wide by 81mm high. Bolt throw is 11mm, bolt is 9.5mm thick, and the case is 16.5mm thick.

Key is 7g and sometimes 6.5g, depending upon how worn they are.

Internally the case is fairly empty, with no internal relock trigger.  No barrel or curtain to prevent picking.

Inside the CT12 - Cap off

Note on this close up that the stump doesn’t have a serrated edge.

No serrations on this stump

There are 5 lever heights in this lock, shown below, 1 to 5 – the similar Lowe and Fletcher 2802 has 4 lifts.  Also similar is the Ace lock, but beware, the keyhole is in a slightly different position and will not easily retro fit to the CT12.  Levers are made from polished brass.

Older versions of the lock have numbers stamped on the levers, 1 being a dead lift, 5 the highest.

Note the position of the anti pick notches on the levers if you intend picking using a 2 in 1.

Here are the 4 lever heights used in a random lock.  Notice how easy the key is to read, shown on the right.

All you need to re-make a lock

A make up key should be a relatively simple project, allowing locks with broken keys to be opened, or the use of a scope to read the lever bellies.

Showing the bellies of the levers - easily decoded with a little practise

If you do end up having to retro fit one of these locks, note that not all bolts are predrilled and tapped.

Note the mounting holes

Sometimes the existing relocker strap may be welded to the bolt head, but it can easily be swapped into the new lock.

Adding the relocker strap - not all bolts are pre-drilled though

With the first paragraph in mind, picking should be fairly routine for anyone used to using a 2 in 1 or confident in opening BS3621 locks with a curtain picks.  There is a pin and cam available, but a long version of the RB 7g 2 in 1 should do the trick.  You can buy these locks from ebay for between £5-10, should you want to practice picking.  The lanket slot makes this easy, or you can drill and tap a hole for a small bolt to hold fewer levers as you practice.
Like I said, a basic intro to this lock, but common enough to be worth the effort of getting a pick and spending a bit of time practicing.

Staff Technical Writer

Leave a Comment

You must be logged in to post a comment.