Description
GRKs R4 self-countersinking screwhas a patented underhead with saw-bladelike cutting teeth and six self-containedcutting pockets. Together they act similarto a circular saw-blade, transporting thedrill dust away from the edge of the screwhole while cutting a perfectly clean holeinto even the most brittle materialswithout cracking any surface treatment.
This design enhances the R4s versatilityby allowing the fastener to countersinkinto even the hardest woods. The head ofthe screw closes the hole off with precision,leaving no damaged fibers around the head.
R4 screws 3-1/8 and longer have a fourthreaded CEE Thread. This enlarges thescrew hole for the non-threaded portionof the fastener, allowing the wood to settleeasily. It increases the screws drawingstrength and reduces the friction on thescrew shank that lowers the driving torque.
Fast Bite Tip: Eliminates pre-drilling and provides afast start for one-step installation.
W-Cut: Low torque, faster drive.
Precision Fit: Reduces wobble between R4 screwsand GRK bits for improved productivity.
Star Drive: Zero stripping, with 6 points of contact.
Optimized Thread Length: Improves clamping forcefor increased drawing power
CEE Thread: Enlarges hole to reduce splitting.
Cutting Teeth: Cuts wood fiber & provides flush seating.
GRK Head Markings: Easy identification of genuineGRK screws.
ESR-3201 Approved for structural applications.
Climatek Coating is AC257 code approvedfor use in treated lumber.
For interior / exterior use in; wood, plastic, cementfiber board, particle board, sheet metal, wood deckingand melamine.
Also available in PHEINOX 305 and 316 gradeStainless Steel.
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