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5/16 x 5-1/8" GRK RSS PHEINOX 305 Stainless Steel Rugged Structural Screw 300 packPHEINOX 305 Stainless Steel
Maximum Corrosion Protection for Harsh Environments
- Interior / Exterior Use
- No Pre-Drilling Unless Material Requires
- Self Countersinking
- Starhead Recess / Non Stripping Heads
- Can Be Used With Fibrous Materials
The unique characteristics of the PHEINOX wire give the stainless steel screws unmatched performance, by maximizing both torque and increasing bending strength.
GRK's R4 self-countersinking screw has an under head with saw-blade like patented 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.
GRK recommends the use of its PHEINOX stainless steel fasteners in tropical woods, cedar wood, pool, hot tub, sauna and seaside applications in areas with large daily temperature variances. The ultimate finish for superior all weather corrosion protection.