Making  bypass tools


Many padlocks are of inferior design and the lock mechanism easily bypassed to open the lock.  Here is a selection of typical bypass ideas.


Padlock shims.

Commercial padlock shims are available, made of spring steel.  They rely on large manufacturing tolerances that leave a small gap between the hasp and the lock body, into which a thin shim can be inserted to push the bolt out of the detents in the hasp. It should be noted that some padlocks have a detent on both ends of the hasp, and therefore two shims would be required. They will not work on all locks, but on those that they do, they offer a very quick way of bypassing the lock mechanism.

HPC padlock shims.


You can make your own shims and the following videos explain the details .....

Beer can padlock shims. Part 1 

Beer can padlock shims. Part 2


Combination lock shim for the Master Padlock.

Bypassing the Master combination padlock with a shim. The video explains it all. A wonderful chance to make yet another shim tool with all that spring steel.


While you are at it make a Peterson style tool for decoding combination locks, of the type used on brief cases etc.


The "American" lock bypass tool.


Warded lock bypass keys.

These rely on the fact that lots of warded padlocks have only one active wafer at the back of the lock and rely on several wards to give the lock some measure of 'security'. These keys ignore the wards and manipulate only the back one or two wafers.


Bypass awl tool. 

Most easily made from a windscreen wiper steel blade. A sharp pint is required on the end, particularly for direct manipulation of the bolt. Works best if fitted with a handle to increase purchase.


Mortise lock key turners.

Where do you leave the key for your back door ? .  Perhaps it is time to change ones habits ?.



Euro Thumb turn lock bypass.

Works on some Euro locks, but lock manufacturers are now wise to this and have started removing the groove that used to make this possible. In reality it will work on many old locks that are still installed.


Comb bypass tools.

Although often described a a comb pick, it is actually a bypass tool. It works by pushing all pins into the lock body, allowing the plug to turn and the lock to open. It works OK on those locks that have a large enough keyway to allow the comb to enter.


Filing cabinet lock Jimmy

Take a windscreen wiper steel blade (2.5mm wide)  and grind one end at an angle of  about 30 degrees.  The tip should look something like this ...


Slide the jimmy to the back of the lock keyway,  Press the jimmy against the bolt and force the bolt downward against the return spring and the lock will open. Also master filing cabinet keys can be purchased that will open 95% of filing cabinet locks.


To be continued