R4™ Multi Purpose Screw

  •  Interior / Exterior Use

         - Decking
         - Stairs
         - Residential Construction

  •  No Pre-Drilling Unless Material Requires
  •  Self Countersinking
  •  Starhead Recess / Non Stripping Heads
  •  Can Be Used With Fibrous Materials
  •  Extreme Threads

Some Sizes Available in PHEINOX™ Stainless Steel


  GRK’s R4™ self-countersinking screw has a patented underhead with saw-blade like patented cutting teeth and six self-contained cutting pockets. Together these features act like a circular saw blade, transporting the "drill dust" away from the edge of the screw hole while cutting a perfectly clean hole into even the most brittle materials without cracking any surface treatment. This design enhances the R4™’s versatility by allowing the fastener to countersink into even the hardest woods. The screw head closes the hole off with precision, not leaving any damaged fibers around the head.

R4™ screws which are 2" and longer have a four threaded CEE thread that enlarges the screw hole for the non-threaded portion of the fastener. This technological advancement allows the wood to settle easily and increases the screw’s drawing strength, reducing the friction on the screw shank and lowering the driving torque. The R4™ is a multi-purpose screw that can be used in all woodworking and plastic applications.

Because the head has a 90 degree angle at the underside, the screw fits perfectly into the pre-countersunk holes of hardware fittings such as hinges or locks. Stocking of different screws is no longer necessary because the R4™ is a very versatile screw.

The R4™ is also known as : Foot Long Annihilators, (torx, torks, torque, torqs) 6 lobe flat head, and of course: The Best Screw Ever.

Mobile Version | Standard Version