Macro is about close up shots making the subject bigger and to see the detail in it. Distance from the subject is depends on the lens and or other macro tools like extension tubes, reverse ring,bellows and such. From the size of your subject(the locks) to take a macro shot would be to focus on a very small part of one of the locks so that it was inlarged as if under a magnifying glass.
So your shot isn't really a macro shot, but a close up of a clump of interesting locks. A good shot though.
Also macro lenses are quite capable of taking great shots that aren't macro shots. So they do great double duty when needed.
I hope this explanation helps answer you question.
Is there a max distance for macro? ISO 400 85mm f1.8 shot @ f4.0 and 1/250
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