The Simpson 1/4 in. x 3 in. Zinc-Plated Duplex-Head Split-Drive Anchor from Simpson is a one-piece mechanical expansion anchor built for fast, reliable fastening into concrete, grout-filled block, and stone. As the anchor is driven into a pre-drilled hole, the split-type expansion mechanism on the working end compresses and exerts force against the walls of the hole, creating a secure hold without the need for adhesive or additional hardware. The duplex head design adds practical flexibility, allowing the anchor to be removed with a claw hammer when the application is temporary - making it a trusted choice for specifiers and contractors across a wide range of structural and light-duty masonry fastening tasks.

Key Features

• Compatible with concrete, grout-filled block, and stone - gives contractors versatility across common masonry base materials without switching anchor types.
• Duplex head design - allows the anchor to be pulled cleanly with a claw hammer, making it well suited for temporary fastening applications where removal is required.
• One-piece split-drive expansion mechanism - compresses against the hole walls as the anchor is driven in, delivering a secure mechanical hold without additional components or adhesives.
• Zinc-plated carbon steel construction - provides a level of corrosion resistance while maintaining the structural integrity expected from a Simpson mechanical anchor.
• Requires a 1/4 in. drill bit - matches the anchor diameter exactly, simplifying tool setup and reducing the chance of installation error on the job site.

Why This Product

• Engineered for demanding structural applications - Simpson designed these mechanical anchors for optimum performance under the most demanding structural conditions, giving specifiers and contractors confidence in critical fastening situations.
• True removability sets it apart - the duplex head allows clean anchor removal with a standard claw hammer, a practical advantage on projects where temporary attachment to masonry is required and reuse of the base material matters.
• No-fuss installation with a single drill size - the anchor diameter and required drill bit diameter are both 1/4 in., so there is no guesswork involved, keeping installation straightforward and consistent across the work site.
• Broad base material compatibility in one anchor - the ability to fasten into concrete, grout-filled block, and stone from a single anchor type reduces the need to stock multiple fastener systems for masonry work.

Specifications

• Manufacturer Part Number (MPN): DSD25300
• Brand: Simpson Strong-Tie
• Diameter: 1/4 in.
• Length: 3 in.
• Head Type: Duplex 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 400

Approved Applications

• Concrete base material
• Grout-filled block (grouted CMU)
• Stone
• Temporary fastening applications requiring anchor removal
• Attaching wood or light gauge steel to concrete and grout-filled block surfaces

Frequently Asked Questions

What base materials is the Simpson DSD25300 Split-Drive Anchor compatible with?

The DSD25300 can be installed in concrete, grout-filled block, and stone, making it a versatile choice for a range of masonry fastening applications.

What drill bit size is required to install this anchor?

A 1/4 in. drill bit is required for proper installation of the DSD25300 Split-Drive Anchor.

Can this anchor be removed after installation?

Yes. The duplex head design allows the anchor to be removed with a claw hammer, making it well suited for temporary fastening applications.

What material and finish is the DSD25300 made from?

The DSD25300 is made from carbon steel with a zinc-plated finish, which provides a level of corrosion resistance for the anchor.

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