Are you tired of searching for the perfect bolt alpha?
Search no more! Check out this awesome tool by Sergey Gricay.
You can use it inside Substance Painter to generate them on the fly, or use Substance Player to create a height map that can be used on any other software like Unreal Engine, Zbrush, etc.
Download it for free at: gumroad.com/1squad
Happy Hard Surface Modelling!