Simpson CSD25400MG CSD 1/4 in. x 4 in. Mechanically Galvanized Split-Drive Anchor is a one-piece mechanical expansion anchor from Simpson Strong-Tie, engineered 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 outward force against the walls of the hole, creating a secure mechanical hold without adhesives or additional hardware. The countersunk head sits flush with the surface, making it ideal for attaching wood or light gauge steel to concrete and masonry surfaces with a clean, low-profile finish.

Key Features

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

Specifications

• Manufacturer: Simpson Strong-Tie
• MPN: CSD25400MG
• 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: 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 substrates
• Fastening into grout-filled concrete masonry units (CMU)
• 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 CSD25400MG Split-Drive Anchor be installed in?

This anchor is designed for installation in concrete, grout-filled block, and stone. It is not intended for use in hollow CMU or brick without grout fill, and should only be used in dry, interior, and non-corrosive environments.

What drill bit size is required to install the CSD25400MG anchor?

A 1/4 in. diameter drill bit is required to pre-drill the hole for this anchor. The anchor itself has a 1/4 in. diameter and 4 in. length.

What does the mechanically galvanized finish mean, and what standard does it meet?

Mechanically galvanized means the carbon steel anchor has been coated through a mechanical process that applies a zinc layer for corrosion resistance. This coating meets ASTM B695, Class 55, Type 1 specifications. The anchor is suitable for dry, interior, and non-corrosive environments only.

How does the split-drive expansion mechanism work?

The CSD25400MG is a one-piece anchor with a split-type expansion mechanism located on its working end. As the anchor is driven into the pre-drilled hole, the split expansion section compresses inward and simultaneously exerts outward force against the walls of the hole, creating a secure mechanical grip without the need for nuts, bolts, or adhesives.

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