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GRK R4 Multi Purpose Screw

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GRK R4 Multi Purpose Screw

GRK R4 Multi Purpose Screws

The R4 Multi Purpose Screws' design further enhances the R4’s versatility by allowing the fastener to be installed without countersinking into even the hardest woods. The screw head closes the hole off with precision, leaving no damaged fibers around the head. Repackaged under license from GRK.

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GRK’s R4 self-countersinking screw is designed with a novel under head & saw-blade like 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.  Available in Diameters #6 thru #12 and lengths from 1-14" thru 12", in Bulk Cartons, ProPaks, and HandyPaks. Several #9 & #10 sizes also available in Contractor Packs.

The R4 9 x 2-1/2" and 9 x 3-1/8" are the most commonly used for decks and are VALUE priced by us for that reason.

R4 Screw #4 requires a T-10 bit.

R4 Screws #6 & #8 requires a T-15 bit.

R4 Screws #9,#10 & #12/14 requires a T-25 bit.


Decimal Shank Diameter*

Nearest Fractional Measurement



















*Shank diameter is measured on the smooth portion of the screw above the threads.

Get all the facts by following the link in the Additional Info Tab to the manufacturer's page for this item

Package Quantity Various sizes of the GRK R4 Multi-Purpose Framing Screw are available.
Manufacturer GRK
Manufacturer Link

GRK Screws

GRK Fasteners supplies high quality deck screws that last. Climatek coated & approved for use in treated lumber, Screws for every application, GRK Screws drive faster & hold longer. All GRK Fasteners have a limited lifetime warranty.

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