R4™ Multi-Purpose Screws by GRK Fasteners
GRK R4™ self-countersinking screw has a new under head with 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.
This 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.
R4™ screws which are 1-1/4 inches and longer have a four threaded CEE thread that enlarges the screw hole for the non-threaded portion of the fastener. This technological advancement allows the wood to settle easily and increases the screw's drawing strength, reducing the friction on the screw shank and lowering the driving torque.
The R4™ is a multi-purpose screw that can be used in all woodworking and plastic applications. Because the head has a 90 degree angle at the underside, the screw fits perfectly into the pre-countersunk holes of hardware fittings such as hinges or locks. Stocking of different screws is no longer necessary because the R4™ is a very versatile screw. These screws work great in wood, plastic, particle board, sheet metal, cement fiber board, composite decking, wood decking, melamine and much more.
GRK Limited Lifetime Warranty (85 KB)
|Drive Type||T-25 Star/Torx|
|Screw Length||1-1/4 in, 1-1/2 in, 1-3/4 in, 2 in, 2-1/2 in, 2-3/4 in, 3-1/8 in, 4 in, and 4-3/4 in|
|Screw Size||#8, #9, and #10|
|Pack Size||Varies by screw size/length|
|Coverage Estimate||12 in OC (100 sq ft): 464 screws|
16 in OC (100 sq ft): 348 screws
|Included Accessories||None (#25 Starhead Bit by GRK Fasteners sold separately)|
|Warranty||View GRK Warranty Information|