CDFYJHFDQ 22-inch Fence Post Anchor Ground Spike for 4x4 Posts — Black Powder-Coated Carbon Steel, Includes Fasteners

The CDFYJHFDQ 22-inch fence post anchor is a heavy-duty, powder-coated carbon steel ground spike designed to secure 3.6" x 3.6" (nominal 4" x 4") wooden posts quickly and without concrete.

This single-piece ground spike gives you a straightforward, long-lasting alternative to poured footings. Built from rust-resistant carbon steel with a black powder coat, the anchor slips into soil or can be driven into compacted ground to hold pergolas, mailboxes, signposts, bird feeders and standard fence posts. It ships with the fasteners and a wrench you need for immediate installation so a single DIYer can set a post in minutes rather than hours.

How does the anchor fasten a 4x4 post securely?

The interior sleeve is sized to fit nominal 4" x 4" posts (actual 3.6" x 3.6"). Once the spike is driven to depth, the post is dropped into the sleeve and fixed with the supplied hex screws and flat-head screws; spring washers help maintain clamp tension over time. This direct connection transfers lateral and vertical loads into the ground spike, avoiding the need for wet concrete.

• Inner sleeve dimensions: 3.6" x 3.6" for a snug fit with trimmed 4x4 posts.
• Four hex screws with spring washers clamp the post; eight flat screws offer extra stability.
• 22" total length gives roughly 17" embedment to stabilize the post in soil.
• Black powder-coating resists corrosion at the screw and contact points.

What are the dimensions and how deep should I install it?

The anchor measures 22" overall with a 17" lower section designed to be driven into the ground and a 5" above-ground collar for post attachment. For typical fencing or light structures, drive the lower section fully into the soil so the post sleeve sits near ground level; adjust depth for frost lines or uneven terrain.

• Total length: 22"; lower embedment length: 17"; exposed collar: 5".
• Designed to accept posts cut to fit the 3.6" x 3.6" interior dimension.
• Embed the spike deep enough for stability yet leave enough collar for screw access.
• Use a mallet, sledge or driving bar; concrete settings can be anchored into compacted fill.

Which materials and conditions is this anchor best suited for?

The spike is formed from carbon steel and finished with an anti-rust black powder coat for outdoor durability. It performs best in firm soils, compacted gravel or leveled backfill; extremely rocky ground may require pre-drilling or an alternative foundation method.

• Material: carbon steel with black powder-coat for corrosion resistance.
• Best used in garden soil, compacted fill, or gravel beds; not for unstable swamp or very loose sand.
• Includes corrosion-resistant fasteners for long-term outdoor exposure.
• Suitable for posts supporting lightweight structures like trellises, bird feeders, signs, and standard fencing.

Who is this for: This ground spike is intended for homeowners, landscapers and small contractors who want a fast, reusable way to install 4x4 posts without mixing concrete. It’s ideal for temporary or permanent light-to-medium outdoor projects—deck railings, mailbox posts, pergola legs, fencing runs, and garden structures—where a stable, low-profile foundation is needed and speed of installation matters.