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S&G 831B/833C with Abloy Protec cyclinder, is it possible?

Information about locks themselves. Questions, tips and lock diagram information should be posted here.

S&G 831B/833C with Abloy Protec cyclinder, is it possible?

Postby Klaiviel » 11 Mar 2010 14:00

Is it possible to drop in or somehow modify a Abloy Protec cylinder to work in either a S&G 831B or a S&G 833C? As I understand it these lock's only weakness is their Medico cylinder so by installing the Protec cylinder you would pretty much be creating the best padlock period, no? Any thoughts?
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Re: S&G 831B/833C with Abloy Protec cyclinder, is it possibl

Postby Squelchtone » 11 Mar 2010 15:37

Klaiviel wrote:Is it possible to drop in or somehow modify a Abloy Protec cylinder to work in either a S&G 831B or a S&G 833C? As I understand it these lock's only weakness is their Medico cylinder so by installing the Protec cylinder you would pretty much be creating the best padlock period, no? Any thoughts?



We've all hand hand parties to this idea before, but you're gonna run into 2 problems. the hole in the bottom of the 833 padlock is made for the flat pin tumbler style key to rotate in an arc x degrees in either direction starting at what I would like to call home state or at 12 o'clock. the operator key has a longer shoulder that sticks out further and the shape of the opening on the bottom of the padlock only allows this key to turn from 12 to 3, and then the lock is unlocked. If you insert a control key which has a smaller shoulder area, it is allowed to turn from 12 back to 9 and you can pull open the shackle AND separate the padlock into two major halves in order to remove cylinder, lubricate parts, etc.

Now, the issue with putting an Abloy Protec in there is the fact that the Protec key is basically a round tube, and the opening on the bottom of the 833 would have to be altered slightly in order to allow for the key to insert into the center of the plug. Right now, I believe it would be off center, but I dont have an Abloy in front of me, just this 833 sitting on my office desk at work.

The other issue is the loss of control key ability with a Protec, unless is it properly pinned up so that you can turn the key left AND right, otherwise based on the basic premise of how Abloy locks work, you need to turn it usually in the clockwise direction to grab the discs and then turn further to allow the sidebar(s) to fall in. I do believe they make Abloy discs that have multiple cut outs for the sidebar and allow the key to turn left or right as in their deadbolt locks, but I will defer this to Jaakko or MitchCapper who know far more about how Abloy Protec works and what it can and can't do.

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Re: S&G 831B/833C with Abloy Protec cyclinder, is it possibl

Postby Klaiviel » 11 Mar 2010 17:33

Wow, thank you for that extremely informative post.

As far as modifing the bottom of the lock to fit the protec key I would not have a problem doing that assuming I could come up with a way to cut the material the lock is made out of enough to make it happen. Btw I would be using a S&G 831B for this as the 833 is much rarer and more valuable and I just wouldn't feel right experimenting on one if I ever acquired one.

As far as turning the key CCW yea I don't have enough experience with the protec yet to even begin to theorize on that. I will however say that I was planning on using a deadbolt cylinder provided I can convince it to fit.
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