The Simpson 1/4 in. x 4 in. Countersunk Split-Drive Anchor is a one-piece mechanical expansion anchor from Simpson engineered for fast, reliable fastening into concrete, grout-filled block, and stone. The split-type expansion mechanism on the working end compresses as the anchor is driven into the pre-drilled hole, exerting outward force against the walls to create a secure mechanical hold - no adhesives, setting tools, or secondary hardware required. The countersunk head sits flush with the surface for a clean finish, making this anchor a dependable choice for attaching wood or light gauge steel to solid base materials in dry, interior applications.

Key Features

• One-piece split-drive design - installs with a single driving motion, reducing labor time and eliminating extra components on the job site
• Countersunk head - sits flush with the surface after installation, producing a smooth, low-profile finish ideal for wood and light gauge steel attachments
• Compatible with concrete, grout-filled block, and stone - provides reliable holding performance across the most common solid masonry base materials
• 1/4 in. drill bit diameter matches anchor diameter - simplifies hole preparation with a single, easy-to-source bit size and helps ensure a snug, consistent fit
• Zinc-plated carbon steel construction - delivers solid mechanical strength for dry, interior and non-corrosive environments where moisture and chemical exposure are not a concern
• Rated for dry, interior and non-corrosive environments only - clearly defined application limits help contractors and specifiers select the right anchor for the job and avoid field failures

Why This Product

• No setting tool or adhesive needed - the self-contained expansion mechanism compresses on impact, so installation is straightforward and requires only a hammer and a standard 1/4 in. drill bit, keeping your toolkit and process simple
• Trusted Simpson engineering for demanding structural applications - specifiers and contractors rely on Simpson mechanical anchors for consistent, repeatable performance in concrete and masonry fastening applications where dependability matters
• Flush countersunk head keeps surfaces clean and professional - the countersunk profile eliminates protrusions above the work surface, making this split-drive anchor a practical solution when attaching wood or light gauge steel and a finished appearance is required
• Broad base material compatibility in one anchor - with approved use in concrete, grout-filled block, and stone, this anchor covers a range of common interior masonry substrates without needing multiple anchor types on hand

Specifications

• MPN: CSD25400
• Brand: Simpson Strong-Tie
• Anchor Type: Split-Drive Anchor
• Diameter: 1/4 in.
• Length: 4 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

• Fastening into concrete
• Fastening into grout-filled block
• Fastening into stone
• Attaching wood to concrete or grout-filled block surfaces
• Attaching light gauge steel to concrete or grout-filled block surfaces
• Dry, interior and non-corrosive environments only

Frequently Asked Questions

What base materials can the Simpson CSD25400 Split-Drive Anchor be installed in?

The CSD25400 Split-Drive Anchor can be installed in concrete, grout-filled block, and stone. It is not intended for use in hollow CMU or other unsupported base materials.

What drill bit size is required to install the CSD25400 anchor?

A 1/4 in. diameter drill bit is required to install the Simpson CSD25400 Split-Drive Anchor.

What environments is the CSD25400 rated for?

The CSD25400 is designed for use in dry, interior and non-corrosive environments only. Its zinc-plated carbon steel construction is not suitable for wet, exterior, 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 force outward against the walls of the hole, creating a secure mechanical hold without the need for adhesives or additional setting tools.

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