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This is Steve of Pragmasis and I'm glad you found our stuff helpful and thanks also for posting your findings with the Ingersoll locks. Ingersoll have an excellent reputation, but they are pricey.
You didn't mention how you got on with the Abloy PL362 with those spare links we sent in combination with various chains? That is a popular topic as the Protec is a very highly respected cylinder (certainly one of the best in the world as a padlock cylinder). However, we advise against use of the PL362 with any 16mm+ chain as the shackle is very very exposed as the opening below the shackle is extremely wide. So, if you've found that you can compensate for that by using odd links of smaller chains, that may offset this concern. Personally, I'd still prefer both of the Ingersoll locks you mentioned, or the similarly-closer-fitting SS65CS from Squire, as relying on e.g. a 13mm chain link to protect the shackle means there is a possible Achille's heel, if someone chooses to crop that thinner link. Even so, those that already have a PL362 may wish to consider it, if you found it workable, as it increases the work a thief needs to do to get at the shackle on that lock.
Thanks again.
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Pragma
@GA2G not sure if there's space for the info but after reading your recommendations and other sources I went for a Pragmasis 19mm chain and an Abloy 362 padlock as my main lock I leave at the station.
My research suggested Almax and Pragmasis are equal in all practical regards.
I needed another lock for outside the flat.
(EDIT: Mispelt Ingersoll all through this - correcting my mistakes, once GAG2 pointed them out)
I read that Ingersoll padlocks are very good and liked the form of their Extra Closed Shackle padlock. Abloy are supposedly harder to pick - namely impossible, but Ingersoll are supposedly nearly as unpickable whilst more resistant to brute force attack. Their "extra closed" shackle appeals for the incredibly limited access it offers between padlock and chain.
I just bought a 16mm Almax chain to use with it, but they are not compatible. The links in the chain are quite circular and the padlock can't close around them. I've had to use the Ingersoll Closed Shackle padlock instead.
When I bought the 19mm chain from Steve at Pragmasis he was really helpful, and sent me sample 13mm and 16mm links to use to restrict the gaps between my chain and the Abloy.
The 16mm sample Pragmasis chain link is a narrower design - they are more oblong in shape than the Almax - and fits the Ingersoll extra closed.
Tl;Dr - My research so far suggests to me that the best 16mm chain and padlock option is the Pragmasis chain and Ingersoll Extra Closed Shackle.