You advise that a decent closed shackle padlock is needed for maximum security but it is impossible to get two chain links into a close shackle padlock. Does this mean that closed shackle lock are only any good for attaching to a bolt or a hasp and staple?

It is true, a closed shackle padlock offers a lot more protection from bolt cutters and saws. However, that doesn’t mean you can’t use a chain. If you have an existing chain and both links on the end are the same size then you won’t get them both into the padlock. It is likely that your chain is cut from long reel in a hardware store or builders merchants. That also means it will be made from mild, galvanised or stainless steel.

The bad news is that all those metal types can be cut easily with a saw or bolt cutters. You need to get a specific length of ‘hardened steel’ chain which, if good quality, will have one long link on the end. This means you can thread the small link through the big link, and then attach it to your closed shackle padlock. See below:

Closed Shackle Padlock and Chain