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Specs - R4

Multi Purpose Screw

  • Self-tapping, countersink head
  • W-Cut™ thread design, ZipTip™
  • Climatek™ coated
  • For use in wood, particle-board, cement fibreboard, plastic, sheet metal.
  • Not all sizes and types continue to be manufactured,
    please contact us for availability.
Mechanical Data Supported by ICC: ESR-3201 www.icc-es.org
R4™ Shear Test Results
Diameter Avg. Ultimate Load (lbf) Wood Failure Rate
#4 139 50%
#6 301 70%
#8 361 30%
#9 452 65%
#10 687 75%
#12 720 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.
  • 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.
GRK Headquarters

GRK Fasteners USA
ITW Renovations / Remodeling
155 Harlem Avenue, Building N3E
Glenview, IL 60025
Tel: 877-489-2726
Fax: 847-619-8403

GRK Fasteners Canada
ITW Construction Products
120 Travail Road
Markham, ON L3S 3J1
Tel: 800-263-0463
Fax: 800-895-5160