Does anyone know what brand is this screw? I thought it might have good performance on hard wood, and want to buy some but don't know what brand it is. Here are the pictures of the screw.
If one does not require the center spiral section, I think you'll find a match with a round washer (truss head) multipurpose torx screw:
"RSS structural screw" gets us some good results.
It looks like a GRK R4™ Multipurpose Star/Torx Screw-#8 Torx Screw.