Simpson CSD25300MG CSD 1/4 in. x 3 in. Mechanically Galvanized Split-Drive Anchor is a one-piece expansion anchor from Simpson Strong-Tie engineered for fast, secure 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 strong mechanical hold without the need for adhesives or secondary components. The countersunk head sits flush with the surface, making it ideal for attaching wood or light gauge steel to concrete and grout-filled block surfaces in dry, interior, and non-corrosive environments.

Key Features

• One-piece split-drive design with a split-type expansion mechanism that locks in place as the anchor is driven into the hole
• Countersunk head allows for a smooth, flush surface finish when securing materials to concrete and grout-filled block
• Can be installed in concrete, grout-filled block, and stone
• Made from mechanically galvanized carbon steel for corrosion resistance in appropriate environments
• Mechanical galvanizing meets ASTM B695, Class 55, Type 1
• Requires a 1/4 in. drill bit for installation
• For use in dry, interior, and non-corrosive environments only
• Trusted by specifiers and contractors for demanding structural applications

Specifications

• Brand: Simpson Strong-Tie
• MPN: CSD25300MG
• 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: Mechanically Galvanized
• Finish: Mechanically Galvanized
• Galvanizing Standard: ASTM B695, Class 55, Type 1
• Packaging: Packs of 100 and Cartons of 400
• Country of Origin: Taiwan

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 can the Simpson CSD25300MG Split-Drive Anchor be installed in?

This anchor can be installed in concrete, grout-filled block, and stone. It is not intended for use in hollow CMU or non-solid base materials unless they are grout-filled.

What drill bit size is required for installation?

Installation requires a 1/4 in. diameter drill bit, which matches the anchor's nominal diameter for a proper interference fit as the expansion mechanism drives into the hole.

Is the CSD25300MG suitable for outdoor or high-moisture environments?

No. This anchor is designed for use in dry, interior, and non-corrosive environments only. While the mechanically galvanized finish meets ASTM B695, Class 55, Type 1, it is not rated for exterior, wet, or corrosive conditions.

What does the countersunk head design offer compared to other head types?

The countersunk head allows the anchor to sit flush with or below the surface of the material being fastened, providing a smooth surface finish. This is particularly advantageous when attaching wood or light gauge steel to concrete or grout-filled block where a protruding fastener head would be undesirable.

Note: Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.