The Simpson 1/4 in. x 3 in. Countersunk Split-Drive Anchor is a one-piece mechanical expansion anchor from Simpson Strong-Tie, built for fast, reliable installation into concrete, grout-filled block, and stone. Its split-type expansion mechanism on the working end compresses as the anchor is driven into a pre-drilled hole, exerting outward force against the hole walls to create a secure hold without adhesives or setting tools. The countersunk head sits flush with the surface after installation, making this anchor a clean, efficient solution for anchoring applications in dry, interior, and non-corrosive environments.

Key Features

• One-piece split-drive construction - the integrated expansion mechanism activates on installation, eliminating the need for separate setting tools or adhesives and saving time on the job.
• Countersunk head design - sits flush with the surface after driving, producing a smooth, low-profile finish that works well when attaching materials directly to concrete or grout-filled block.
• Compatible with concrete, grout-filled block, and stone - versatile base material support means this anchor handles a broad range of common structural and general anchoring tasks in one product.
• Zinc-plated carbon steel construction - the zinc plating provides a level of corrosion resistance appropriate for dry, interior, and non-corrosive environments, while carbon steel delivers solid structural integrity.
• Requires a 1/4 in. drill bit - the matching drill bit diameter simplifies hole preparation and ensures a consistent, properly sized hole for reliable expansion every time.
• Rated for dry, interior, and non-corrosive environments - a clearly defined use environment helps contractors and specifiers select the right anchor for the application and avoid improper installation.

Why This Product

• Tool-free setting process - because the split-drive expansion mechanism is built into the anchor itself, installation requires only a hammer and a pre-drilled hole, reducing equipment needs and speeding up repetitive anchoring tasks.
• Flush finish without additional hardware - the countersunk head eliminates protruding fastener profiles, making this anchor well suited for surface-sensitive applications where a clean, flat finish matters.
• Trusted Simpson Strong-Tie engineering - Simpson Strong-Tie mechanical anchors are designed and specified for demanding structural applications, giving contractors and project managers confidence in consistent, repeatable performance.
• Solid material and coating match for the application - zinc-plated carbon steel is matched specifically to dry, interior conditions, meaning buyers get a coating level appropriate for the environment without paying for unnecessary corrosion upgrades.

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: CSD25300
• Anchor Diameter: 1/4 in.
• Length: 3 in.
• Head Type: Countersunk Head
• Head Diameter: 1/2 in.
• Drill Bit Diameter: 1/4 in.
• Material: Carbon Steel
• Coating/Finish: Zinc Plated
• Packaging: Packs of 100 and Cartons of 400

Approved Applications

• Concrete
• Grout-filled block
• Stone
• Dry, interior, and non-corrosive environments only

Frequently Asked Questions

What base materials are compatible with the CSD25300 Split-Drive Anchor?

The CSD25300 is designed for installation into concrete, grout-filled block, and stone. It is not intended for hollow CMU or other non-solid base materials in this configuration.

What size drill bit is required to install the CSD25300?

A 1/4 in. diameter drill bit is required to prepare the hole for this anchor prior to driving it into place.

Is the CSD25300 suitable for outdoor or high-moisture environments?

No. The CSD25300 is rated for use in dry, interior, and non-corrosive environments only. It should not be used in outdoor, wet, or chemically aggressive conditions.

How does the split-drive expansion mechanism work?

As the anchor is driven into the pre-drilled hole, the split-type expansion mechanism on the working end compresses against the walls of the hole, generating outward force that holds the anchor securely in place without the need for adhesives or setting tools.

Note: Product dimensions may differ from picture. Please see the item description above for specifications.