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Four black powder-coated steel ground spikes, 36 inch tall, square 3.5 inch inner width

VEVOR

VEVOR Fence Post Anchor Ground Spike 4 Pack 36 Inch 3.5 Inch Inner Diameter Black Powder Coated Steel

SKU CH-P8QN-EJZ87

Four 36-inch steel ground spikes with 3.5-inch inner diameter secure fence posts, deck rails or mailboxes without concrete

  • TypeOther Appliances
  • Width12.4
  • Thickened solid steel resists bending under load
  • Powder coating blocks rust from soil and rain
  • 7 in inner width fits 3.5 in square timber
  • Four anchors with eight screws and eight anti-loose nuts included
  • 36 in total height with 30 in nail depth drives deep for firm hold

Heavy-duty fence post anchor

This 36-inch ground spike is built from thickened hard steel with a black powder coating that resists corrosion and protects timber from rot. Each unit has a 3.5-inch inner diameter suited to 3.5 x 3.5 square posts and includes screws and anti-loose nuts for a secure fit. The four-piece set covers a typical fence line or mailbox installation.

Sustained ground contact performance

The 1.7 mm steel thickness on both the nail and fixing plate maintains rigidity when driven 30 inches into soil, preventing bending under lateral fence loads. Powder coating withstands continuous moisture and soil acidity without flaking, so the anchor keeps its protective barrier season after season. Wood stays dry inside the 3.7-inch socket, reducing rot at the critical ground-line zone.

Installation limits and compatibility

The anchor accepts only 3.5-inch square lumber; round posts or larger timbers will not seat properly. Hard or rocky ground may require pre-drilling because the spike relies on direct driving force. The 36-inch total height with 30-inch nail length fixes the post elevation, so terrain grading must match the set depth.

Highlights

  • Thickened solid steel resists bending under load
  • Powder coating blocks rust from soil and rain
  • 7 in inner width fits 3.5 in square timber
  • Four anchors with eight screws and eight anti-loose nuts included
  • 36 in total height with 30 in nail depth drives deep for firm hold

Specifications

TypeOther Appliances
Width12.4

Questions about this item

How much ground depth does the 36 in spike reach when driven all day?

The nail section extends 30 in (762 mm) below grade, leaving the 6 in collar above ground for the post.

What post size must I already have for the 3.5 in inner width to fit?

The square socket accepts 3.5 in × 3.5 in (89 mm) timber; the inner clearance is 3.7 in.

Will the 1.7 mm steel plates and included screws hold a reused 3.5 in post without bending?

Yes — each anchor uses 1.7 mm thick fixing plates and comes with eight screws and anti‑loose nuts for a rigid connection.

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