GRK R4 Multi-Purpose Screw Review (2026)
By The DIYPicks Team · Updated July 2026
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- Framing
- Exterior
- Structural
- General purpose
A do-almost-everything, code-approved star-drive screw that justifies its price when you want one box for framing and exterior work.
Pros
- ESR-3201 code-approved and rated for structural loads, so it covers framing and ledger work
- Zip-Tip and CEE threads bite fast and resist splitting, usually eliminating pre-drilling
- ClimaTek coating is exterior- and treated-lumber-rated, so one screw handles most jobs
Cons
- Costs noticeably more per screw than bulk-box builder screws
- ClimaTek is corrosion-resistant but not stainless, so it is not ideal for coastal or ground-contact
- Sold in smaller counts at most retailers, so big projects mean buying several boxes
Specifications
| Drive | Star (T-25 / T-27) |
|---|---|
| Coating | ClimaTek (interior + exterior + treated lumber) |
| Length range | 1 in - 6 in (#8-#10) |
| Head | Flat / countersink with underhead cutting nibs |
| Material | Hardened steel |
| Thread | CEE thread + Zip-Tip (no pre-drill) |
| Code | ICC ESR-3201 (structural) |
| Best use | Framing, deck framing, general construction |