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S-Mount for the Logitech C920 camera, designed by Matthew Lai.
Matthew said on the thingiverse page for this that he used two M2x0.8 screws to attach it to the circuit board, I think he meant two M2x0.4x8.
You would also need a locking ring like this one: http://www.m12lenses.com/M12x0-5-Lock-Ring-Plastic-p/pt-lr001p.htm
Original thingiverse link: http://www.thingiverse.com/thing:225196
Thanks to Matthew!