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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.

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  • Are you able to predrill the holes? Screws can't really drill because they have no way to physically remove the chips/sawdust. That is why drills have flutes. Without removing the material from the hole, you are just compressing the wood fiber in the same place.
    – Harper - Reinstate Monica
    Commented Apr 18, 2018 at 16:19

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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:

torx screw

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"RSS structural screw" gets us some good results.

enter image description here

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It looks like a GRK R4™ Multipurpose Star/Torx Screw-#8 Torx Screw.

http://www.rockler.com/grk-r4trade-multipurpose-star-torx-screw-8-torx-screws

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  • That's a very different head profile.
    – isherwood
    Commented Apr 18, 2018 at 12:20
  • @isherwood I'd agree, but that shank spiral is quite distinctive (and perhaps patented) so John may have the right manufacturer.
    – Harper - Reinstate Monica
    Commented Apr 18, 2018 at 16:18
  • Maybe, but the tip isn't right, either.
    – isherwood
    Commented Apr 18, 2018 at 16:47

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