The Simpson 1/4 in. x 2 in. Countersunk Split-Drive Anchor from Simpson is a one-piece mechanical expansion anchor built for fast, reliable fastening into concrete, grout-filled block, and stone. Engineered by Simpson Strong-Tie, it features a split-type expansion mechanism on the working end that compresses as the anchor is driven into the pre-drilled hole, exerting outward force against the hole walls for a firm, secure hold without the need for nuts, washers, or adhesives. The countersunk head sits flush with the surface for a clean finish, making it a practical choice for attaching wood or light gauge steel to concrete and grout-filled block in dry, interior applications.

Key Features

• One-piece split-drive expansion mechanism - compresses against hole walls as the anchor is driven in, creating a secure hold without extra hardware or assembly steps
• Countersunk head design - sits flush with the work surface for a smooth, snag-free finish that does not interfere with overlying materials
• Compatible with concrete, grout-filled block, and stone - gives contractors and builders flexibility across common masonry substrates without switching anchor types
• Requires a 1/4 in. drill bit - matches the anchor diameter exactly, so hole prep is straightforward and no upsizing or special tooling is needed
• Made from zinc-plated carbon steel - the zinc plating provides a protective barrier suited to dry, interior and non-corrosive environments where these anchors are approved for use
• Approved for attaching wood and light gauge steel to concrete and grout-filled block - covers two of the most common interior fastening tasks with a single anchor solution

Why This Product

• Simple, tool-driven installation - the split-drive mechanism requires no setting tool, adhesive, or secondary hardware, meaning anchors can be driven and set quickly to keep projects moving on schedule
• Trusted Simpson Strong-Tie engineering - Simpson Strong-Tie mechanical anchors are relied on by specifiers and contractors for performance under demanding structural applications, bringing that same standard to everyday concrete fastening tasks
• Flush finish for cleaner results - the countersunk head eliminates raised fastener profiles, which is a practical advantage when attaching wood framing or light gauge steel where a flat bearing surface matters
• Consistent performance across common masonry bases - with verified compatibility in concrete, grout-filled block, and stone, this anchor reduces the guesswork of selecting the right fastener for typical interior masonry substrates

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: CSD25200
• Material: Carbon Steel
• Coating/Finish: Zinc Plated
• Diameter: 1/4 in.
• Length: 2 in.
• Head Type: Countersunk Head
• Head Diameter: 1/2 in.
• Drill Bit Diameter: 1/4 in.
• Packaging: Packs of 100 and Cartons of 500

Approved Applications

• Concrete surfaces in dry, interior and non-corrosive environments
• Grout-filled block and grouted CMU (Concrete Masonry Unit)
• Stone substrates
• Attaching wood to concrete and grout-filled block surfaces
• Attaching light gauge steel to concrete and grout-filled block surfaces

Frequently Asked Questions

What base materials can the Simpson CSD25200 Split-Drive Anchor be installed in?

The CSD25200 Split-Drive Anchor can be installed in concrete, grout-filled block, and stone. It is not intended for use in hollow CMU or ungrouted masonry applications.

What drill bit size is required to install the CSD25200 anchor?

A 1/4 in. drill bit is required to create the proper hole for installing the CSD25200 Split-Drive Anchor.

Is the Simpson CSD25200 suitable for outdoor or corrosive environments?

No. The CSD25200 is made from zinc-plated carbon steel and is approved for use in dry, interior and non-corrosive environments only. It should not be used in wet, outdoor, or corrosive 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 and exerts outward force against the walls of the hole, securing the anchor firmly in place without the need for additional hardware or setting tools beyond a hammer.

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