The Simpson 1/4 x 1-1/2 Countersunk Split-Drive Anchor from Simpson is a one-piece mechanical anchor engineered for fast, reliable fastening into concrete, grout-filled block, and stone. Its split-type expansion mechanism on the working end compresses as the anchor is driven into the pre-drilled hole, exerting force against the hole walls to create a secure, high-strength connection without the need for additional hardware or epoxy. The countersunk head sits flush with or below the surface of the attached material, making this anchor well suited for attaching wood or light gauge steel to concrete and masonry surfaces in dry, interior, and non-corrosive environments.

Key Features

• One-piece split-drive design - no separate components to manage during installation, reducing labor time and the risk of lost parts on the job site.
• Split-type expansion mechanism - compresses against the walls of the pre-drilled hole as the anchor is driven in, delivering a secure mechanical hold without adhesives or setting tools.
• Countersunk head profile - sits flush with or below the surface of the attached material for a clean, low-profile finish that does not interfere with overlying surfaces or finishes.
• Compatible with concrete, grout-filled block, and stone - versatile base material compatibility keeps a single anchor solution working across multiple masonry applications on the same project.
• Zinc-plated carbon steel construction - provides a corrosion-resistant finish appropriate for dry, interior, and non-corrosive environments, while maintaining the structural integrity expected from a carbon steel anchor.
• Requires a 1/4 in. drill bit - the hole diameter matches the anchor diameter exactly, simplifying tool selection and helping ensure a properly sized hole for optimal expansion performance.

Why This Product

• Trusted Simpson engineering for demanding structural applications - Simpson split-drive anchors are a go-to choice for specifiers and contractors who need consistent, predictable holding performance in concrete and masonry base materials.
• Streamlined installation with no special tooling - the one-piece construction and simple drive-in installation method mean faster placement compared to multi-component anchoring systems, keeping projects on schedule.
• Flush finish where appearance and clearance matter - the countersunk head makes this anchor particularly practical for wood-to-concrete and light gauge steel-to-concrete connections where a protruding fastener head would be a functional or aesthetic problem.
• Consistent performance across common masonry substrates - verified compatibility with concrete, grout-filled block, and stone means crews can rely on a single anchor selection for a wide range of interior fastening tasks rather than stocking multiple anchor types.

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: CSD25112
• Diameter: 1/4 in.
• Length: 1-1/2 in.
• Head Type: Countersunk Head
• Head Diameter: 1/2 in.
• Drill Bit Diameter: 1/4 in.
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Packaging: Packs of 100 and Cartons of 500

Approved Applications

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

Frequently Asked Questions

What base materials is the Simpson CSD25112 Split-Drive Anchor compatible with?

The CSD25112 can be installed in concrete, grout-filled block, and stone. It is not designed for use in hollow CMU or other unsupported base materials.

What drill bit size is required to install the CSD25112 anchor?

A 1/4 in. drill bit is required to create the properly sized hole for this anchor prior to installation.

Is the Simpson CSD25112 suitable for outdoor or corrosive environments?

No. The CSD25112 is zinc-plated carbon steel and is approved for use in dry, interior, and non-corrosive environments only. It should not be used in wet, exterior, or corrosive conditions.

What is the benefit of the countersunk head on the CSD25112?

The countersunk head is designed to sit flush with or below the surface of the attached material, providing a smooth, low-profile finish - making it particularly useful when attaching wood or light gauge steel to concrete and grout-filled block surfaces.

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