DeWALT Mushroom Head Spring Spike, 1/2 in. x 4 in. - 25 Pack is a one-piece, vibration-resistant concrete and masonry anchor engineered for permanent, tamper-proof fastening in concrete, block, and stone applications. Formed from carbon steel with a zinc finish, this pre-expanded spike anchor eliminates secondary tightening steps, making it a reliable choice for professional contractors who need fast, secure anchoring without added labor. The distinctive "S" shaped configuration at the working end creates a built-in expansion mechanism that locks the anchor in place once seated - no additional hardware or tools required after driving.

Key Features

• Pre-expanded anchor design - the anchor arrives ready to install with no pre-setting or secondary tightening required, significantly reducing installation time and overall cost per anchor point.
• Mushroom head style with tamper-proof design - once installed, the low-profile mushroom head resists unauthorized removal, making this spike ideal for security-sensitive or public-facing applications in concrete and masonry.
• "S" shaped expansion mechanism at the working end - residual spring forces create a self-locking grip inside the anchor hole, so the anchor holds firmly even when subjected to vibratory loads or dynamic stresses.
• Vibration-resistant construction - the spring action of the expansion mechanism causes the anchor to expand further under vibratory conditions, increasing holding power over time rather than loosening.
• Carbon steel body with zinc finish - the zinc plating provides a corrosion-resistant barrier on a high-strength carbon steel core, balancing durability with economy for interior and protected exterior masonry installations.
• Sold in a pack of 25 - buying in quantity reduces per-unit cost and keeps your fastener supply ready for multi-anchor projects in concrete block or stone.
• One-piece construction - the single-body design removes variables from the installation process, reducing the chance of component misalignment or installation error compared to multi-part anchor systems.

Why This Product

• No secondary tightening needed - because the anchor is pre-expanded at the factory, installation is faster and more consistent than traditional expansion anchors that require torque verification after setting, cutting labor on large projects.
• Built-in tamper resistance in the mushroom head - for installations in publicly accessible areas such as walls, floors, or structural fixtures in concrete block or stone, the tamper-proof head style discourages unauthorized removal without special tools.
• Reliable holding power under vibration - the "S" shaped spring mechanism does not rely on friction alone; it actively expands under dynamic load, making this spike a strong fit for anchoring applications near machinery, heavy traffic, or other sources of ongoing vibration.
• Efficient multi-piece packaging - the 25-piece pack format makes this anchor practical for job-site use, keeping installation moving without constant restocking on projects with multiple anchor points in concrete and masonry substrates.

Specifications

• Brand: DeWALT
• Manufacturer Part Number: 05572-PWR
• Product Type: Spike
• Head Style: Mushroom
• Diameter: 1/2 in.
• Fastener Length: 4 in.
• Primary Material: Carbon Steel
• Finish: Zinc
• Connection Design: Concrete and Masonry
• Power Source: Non-Energy Using
• Package Quantity: 25
• Weight: 0.256 lb.
• Country of Origin: Taiwan
• Warranty: N/A

Approved Applications

• Anchoring into concrete block and concrete substrate
• Fastening into brick and stone masonry
• Permanent tamper-proof installations in publicly accessible masonry structures
• Applications subject to ongoing vibration or dynamic loading where anchor loosening is a concern
• Temporary installations using the forming spike variant for removable anchoring needs
• Alternative to direct fastening methods such as powder-actuated tools in pipe and tie-wire applications

Frequently Asked Questions

Does this spike anchor require any tightening after it is driven into the hole?

No. The DeWALT mushroom head spring spike is pre-expanded at the factory. The "S" shaped configuration at the working end of the anchor forms the expansion mechanism before installation, so once the anchor is driven to the required embedment depth, no secondary tightening operation is needed. This pre-expanded design is a key advantage that reduces installation time and cost.

What base materials is this spike anchor designed for?

This spike anchor is designed for use in concrete, block, brick, and stone substrates. The connection design is rated for concrete and masonry applications. It is not intended for wood, metal, or drywall installations.

Is the mushroom head style tamper-proof?

Yes. Mushroom head spike anchors are tamper-proof by design. Once the anchor is seated at the required embedment, the mushroom head resists removal without specialized tools, making it well-suited for security-sensitive or publicly accessible installations in masonry.

How does this anchor perform under vibration?

The spike anchor is specifically described as vibration resistant. The residual spring forces developed in the "S" shaped expansion mechanism at the working end of the anchor create three compression forces at the bottom of the anchor hole. When the anchor is subjected to vibratory loads, the spring action of the expansion mechanism causes the anchor to expand further, increasing holding power rather than allowing loosening over time.