R4 Multi-Purpose Screw Bulk

R4 Multi-Purpose Screw Bulk

GRK FASTENERS



  • Self-tapping
  • Self-countersinking head
  • patented head and thread
  • No predrilling
  • No stripped heads
  • Multi-purpose use: Wood, particle board, cement fiber board, MDF decking, plastic, sheet metal, PVC, and melamine
  • GRK's R4 self-countersinking screw has six self contained cutting pockets which act like a router and transport the drill dust away from the edge of the screw hole. In addition, the R4's patented head design also features cutting teeth which enable the R4 to flawlessly and effortlessly work in any material without the need for countersinking. In fact, the R4 head design is so effective that it will not crack even the most brittle of materials, such as melamine... and all this without pre-drilling or pre-countersinkin.
    • R4™ Shear Test Results:
    • Diameter #4 Avg. Ultimate Load (lbf) 139 Wood Failure Rate 50%
    • Diameter #6 Avg. Ultimate Load (lbf): 301 Wood Failure Rate: 70%
    • Diameter #8 Avg. Ultimate Load (lbf): 361 Wood Failure Rate: 30%
    • Diameter #9 Avg. Ultimate Load (lbf): 452 Wood Failure Rate: 65%
    • Diameter #10 Avg. Ultimate Load (lbf): 687 Wood Failure Rate: 75%
    • Diameter #12 Avg. Ultimate Load (lbf): 720 Wood Failure Rate: 75%
    • Test ASTM D 1761 Lateral Resistance/Slip, Wood to Wood connection.
    • Testing stopped when screw displaced 1/8" or upon wood failure. Wood failed in majority of tests prior to screw failure. Test conducted in wood with specific gravity 0.42.
    • Please note, the above stated values are ultimate loads. For construction design purposes an applicable safety margin should be applied. An architect or engineer should be consulted for this.


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