R4™ MULTI-PURPOSE FRAMING AND DECKING SCREW (Bulk)
- Self-tapping, countersinking head, W-Cut thread design, CEE Thread, Zip-Tip™, and Climatek™ coated.
For use in wood, particle-board, cement fiberboard, plastic, sheet metal, etc.
- patented head and thread
- No predrilling
- No stripped heads
- Multi-purpose use: Wood, particle board, cement fiber board, MDF decking, plastic, sheet metal, PVC, and melamine
- GRK's R4™ self-countersinking screw has a new underhead with saw-blade
like cutting teeth and six self-contained cutting pockets. Together they act
similar to 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 also
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 2" and longer have a four threaded CEE Thread. This enlarges
the screw hole for the non-threaded portion of the fastener, allowing the
wood to settle easily. It increases the screw’s drawing strength and reduces
the friction on the screw shank that lowers the driving torque.
The R4™ is available in 59 sizes: 4 x 3/8" to 12 x 12".
Multi-use: wood, particle board, plastic, sheet metal, cement fiberboard,
composite decking, wood decking, melamine.
Some sizes available in PHEINOX™ Stainless Steel, see blue tabbed pages.
- R4™ Shear Test Results:
- Diameter #4 Avg. Ultimate Load (lbf) 139 Wood Failure Rate 50%
- Diameter #6 Avg. Ultimate Load (lbf): 301 Wood Failure Rate: 70%
- Diameter #8 Avg. Ultimate Load (lbf): 361 Wood Failure Rate: 30%
- Diameter #9 Avg. Ultimate Load (lbf): 452 Wood Failure Rate: 65%
- Diameter #10 Avg. Ultimate Load (lbf): 687 Wood Failure Rate: 75%
- Diameter #12 Avg. Ultimate Load (lbf): 720 Wood Failure Rate: 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.
- Please note, 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.