Description
Overview
The GRK Fasteners Caliburn Concrete Screw (57778) is designed for anchoring and fastening applications in concrete, masonry, and similar substrates. Engineered by ITW Brands, this 25-pack of 19/64 in. x 3-1/2 in. screws delivers professional-grade holding performance in demanding construction environments where traditional anchors were previously required.
| MPN | 57778 |
|---|---|
| Brand | GRK Fasteners / ITW Brands |
| Size | 0.29 in. Diameter x 3.5 in. Length |
| Pack Quantity | 25 screws |
| Package Weight | 4.82 lb |
| Coating | Climatek |
| Certifications | ESR-3251 (concrete anchoring); AC257 code approved (treated lumber) |
| Head Style | Caliburn XL Washer Head |
| Color | Yellow |
Technical Features
- Patented thread design: Aggressive heavy-duty threads lock mechanically into concrete, enabling secure engagement with the substrate for high draw and pullout strength.
- Six-point contact drive system: Zero-strip design provides full torque transfer to the fastener head, reducing cam-out and driver bit wear during installation.
- Re-enterable pilot hole compatibility: Screws can be removed and reinserted into the same pilot hole multiple times without fastener breakage or thread degradation, reducing material waste on adjustable or temporary assemblies.
- Climatek corrosion-resistant coating: Provides high corrosion resistance and is AC257 code approved for use in treated lumber, expanding application suitability in both interior and exterior environments.
- ESR-3251 certified: Independently evaluated and approved for use in concrete anchoring applications, supporting use on code-compliant and engineered projects.
- Caliburn XL washer head design: Engineered for superior holding power, distributing clamping load over a larger bearing surface compared to standard head profiles.
- Anchor-replacement capability: Uncompromised draw and pullout strength allows substitution for traditional concrete anchors in qualifying applications, streamlining fastener selection on job sites.
Applications
- Direct fastening into concrete and masonry substrates
- Anchoring structural and non-structural components to concrete where ESR-3251 compliance is required
- Fastening into treated lumber in code-regulated applications (AC257 approved)
- Installations requiring removable and reinstallable fasteners without pilot hole damage
- Applications previously requiring mechanical concrete anchors
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