Padlock with a lock system based on three password wheels (digits from 0 to 9). I used a real model as reference.

Model is composed by five pieces:
-Main body (blue part)
-Three password wheels
-Shackle

Geometry showed above is for model with no subdivisions. By default model have one subdivision level for display, and two subdivisions level for renders, increasing these geometry exponentially.

All pieces are parented to main body (excerpt this own), and have a control for each one, including constraints.

Textures and materials
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Each piece has his own textures (2048x2048): diffuse, specular and normal maps (this last only for main piece and password wheels), so there are a total of eight texture files.

I added a Principled BSFD material (Cycles) for each piece, with metallic-end and each neccesary map/texture linked to this.

UV maps
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Almost of UV maps aren't overlapping, excerpt for main piece, neccesary for mirrored sides.

Render samples and presentation
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Rendered with Cycles (textured, occlusion and wireframe). Including turn-arounds for each render, and an extra animation (textured only) to show how controllers work.

Finally, for all texture renders, I used an environment HDRI image from third part (not included in download) and a sun light.