GRK R4 Multi-Purpose Screw Review (2026)
By Nate Sawyer, Editor · Updated July 2026
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- Framing
- Exterior
- Structural
- General purpose
GRK's R4 is a code-listed (ESR-3201) star-drive construction screw whose Zip-Tip and CEE threads sink into framing and exterior work without pre-drilling, with a ClimaTek coating rated for treated lumber. One box covers most jobs, but it costs far more than bulk builder screws and isn't stainless for coastal or ground-contact use.
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 |
Frequently Asked Questions
- Are GRK R4 screws code-approved for structural use?
- Yes - they carry ICC ESR-3201 and are rated for structural loads, which covers framing and ledger work where a generic builder screw would not be acceptable. That code listing is the main reason to pay the premium.
- Do you need to pre-drill for GRK R4 screws?
- Usually not. The Zip-Tip and CEE threads bite fast and resist splitting, which normally eliminates pre-drilling even near board ends. The head has underhead cutting nibs so it countersinks itself cleanly.
- Can GRK R4 be used outdoors and in treated lumber?
- Yes, the ClimaTek coating is rated for interior, exterior and treated lumber, so one screw covers most jobs. The limit is that ClimaTek is corrosion-resistant, not stainless, so for coastal exposure or ground contact you want a stainless fastener instead.
- Why are they so expensive?
- You are paying for the code listing, the coating and the thread geometry, and they cost noticeably more per screw than bulk-box builder screws. Most retailers also sell them in smaller counts, so a large project means buying several boxes.