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GRK Fasteners utilizes strict quality control procedures. Every batch of screws produced is independently random sampled and quality controlled to the highest standards.

Accreditations for independent test laboratories include:

Installation procedure for Fasteners

  • Use appropriate driver bit.
  • No pre-drilling except where wood limitations require.
  • DO NOT use deck cleaners which contain bleach with coated metals.
  • Always consult wood supplier's / manufacturer's recommendations.
  • Metal to wood connections: avoid damage to the coating by pre-drilling the metal.
  • Cedar & Redwood: For best results use PHEinox Stainless Steel. If using coated fasteners, seal wood immediately with a quality sealer to lessen the likelihood of tanic acid stains.
GRK Headquarters

GRK Fasteners USA ITW Renovations / Remodeling
955 National Pkwy, Suite 95500
Schaumburg, IL 60173
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


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