Chain scale simulation Units

I am doing a small test on a chain simulations .Simple physix shape and a physics collision operand.
Alll works with default settings if scale of one piece of the chain is roughly 50sm.

The moment I change the scale to a very small setup ( new one)
chain is 1 sm  in  radiius all simulation breaks apart..Adjusting the vocal size would not solve the problem so what is causing that 

Did you forget to adjust other related forces, like gravity?

Also the smaller the size of your objects (if gravity stays the same), the more simulation steps you'll need to prevent collisions and such.

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