The Simpson 1/4 in. x 4 in. Mushroom Head Crimp Drive Anchor is an easy-to-install expansion anchor engineered for use in concrete and grout-filled block. The preformed curvature along the shaft creates a built-in expansion mechanism that locks the anchor firmly in place once driven, eliminating the need for a secondary tightening procedure and accelerating installation across a wide range of structural and light-duty fastening tasks. With its low-profile mushroom head and zinc-plated carbon steel construction, this anchor is equally at home fastening wood or light-gauge steel, securing concrete formwork, or providing overhead support for sprinkler pipes and suspended ceiling panels.

Key Features

• Unique curved shaft design - the preformed curvature acts as a self-contained expansion mechanism, gripping the base material firmly so the anchor stays securely in place without any post-installation adjustment.
• No secondary tightening required - the built-in expansion action eliminates an entire step from the installation process, saving time on the job and reducing the risk of under- or over-tightening.
• Mushroom head provides a tamper-proof solution - the low-profile head offers no accessible grip point for removal tools, making this anchor a dependable choice wherever security and tamper resistance matter.
• Zinc-plated carbon steel construction - the zinc plating delivers a corrosion-resistant finish over a strong carbon steel core, supporting reliable long-term performance in concrete and grout-filled block applications.

Why This Product

• One-step installation in demanding base materials - the crimp drive anchor's self-expanding curved shaft secures itself in concrete and grout-filled block in a single drive operation, removing the extra tightening step that conventional expansion anchors require.
• Versatile across multiple fastening applications - a single anchor model handles wood-to-concrete fastening, light-gauge steel attachment, concrete formwork, and overhead support for sprinkler pipes or suspended ceiling panels, reducing the number of different fastener types needed on a job site.
• Tamper-resistant by design - the mushroom head style is purpose-built for applications where unauthorized removal is a concern, providing added security without any supplemental hardware or additional steps.
• Trusted Simpson engineering in a field-ready format - manufactured from zinc-plated carbon steel and backed by Simpson's reputation for structural fastening solutions, this anchor is a straightforward, reliable choice for contractors and installers working in concrete and masonry environments.

Specifications

• Model Number (MPN): CD25400M
• Brand: Simpson Strong-Tie
• Size: 1/4 in. x 4 in.
• Head Type: Mushroom Head
• Material: Carbon Steel
• Coating: Zinc Plated
• Finish: Zinc Plated
• Packaging: Packs of 100 and Cartons of 400

Approved Applications

• Fastening wood to concrete and grout-filled block
• Fastening light-gauge steel to concrete and grout-filled block
• Attaching concrete formwork
• Hanging overhead support for sprinkler pipes
• Supporting suspended ceiling panels

Frequently Asked Questions

What type of base material is the Simpson CD25400M anchor designed for?

The Simpson Strong-Tie Crimp Drive anchor is designed for use in concrete and grout-filled block, making it suitable for a wide range of structural and light-duty fastening applications in these substrates.

Why does this anchor not require a secondary tightening procedure?

The anchor features a unique preformed curvature along its shaft that acts as a built-in expansion mechanism. Once driven into the drilled hole, this curved shaft expands against the base material to lock the anchor firmly in place, eliminating the need for any additional tightening step.

What makes the mushroom head style a tamper-proof option?

The mushroom head design sits flush and low-profile once installed, offering no accessible grip point for removal tools. This makes it an ideal choice for applications where tamper resistance and security are priorities.

What materials can be fastened using the CD25400M mushroom head anchor?

The mushroom head style is well-suited for fastening wood or light-gauge steel to concrete and grout-filled block, as well as for applications such as attaching concrete formwork and hanging overhead supports for sprinkler pipes or suspended ceiling panels.

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