4x4 Post Cap │ Black Flat Top

Four by four Black Flat Top Post Cap for wooden posts.

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Our black flat top 4x4 post caps are an excellent alternative to comparable wooden toppers that cost more. If you want to add a decorative element and color to an existing fence or one you’re about to install, check out our complete line of ASA resin fence post caps. They’ll not only make your landscape a lot more attractive and inviting. They’ll enhance your curb appeal and potentially increase the value of your property. For a small investment, you’ll reap enormous benefits.

View our installation instructions here.

4X4 Black Flat Top Post Caps

  • Comes in Nominal (3.5” x 3.5” up to 3.75" x 3.75") and Actual (4.0" x 4.0" to 4.6" x 4.6")

  • These caps slide down the post 1.5” and are 5.5” x 5.5” at their widest point.

  • 10 year guarantee against fading, discoloration and warping!

  • High impact, remarkably sturdy ASA resin. The same material used in automobiles!

  • Made in the U.S.A.

  • Quick and easy patented SNAP-CAP installation, built right into the cap!

  • Fraction of the cost of comparable wood caps.

  • Contractor and bulk pricing available!

The black flat top 4x4 post caps come in two versions: Nominal and True (or Actual.) Before machine milling existed, a 4x4 referred to green wood - or wood that hadn’t been kiln-dried or planed. Once the board went through those processes, it was half an inch smaller than it was as a rough cut plank. All posts whose measurements are smaller than the size indicated on the label are referred to as nominal. Actual or true refers to planks that have the same dimensions as those shown on the label.

  • Our Actual or True post caps will work with vinyl and Trex.
  • ASA resin is a man-made plastic that car and marine vehicle manufacturing companies use for their vehicles. It is stronger and more durable than wood, and it’s not subject to continual problems of contraction and expansion every time the humidity levels change. Over time, all of that movement can cause wood to warp and weaken.
  • Our black flat top 4x4 post caps cost a fraction of what you’d pay for comparable wood post toppers. They last a lot longer, too.
  • We guarantee all post caps made of ASA resin for ten years - against discoloring, fading, or warping.

Thanks to our patented SNAP-CAP installation technology, our fence post caps are easy to install. And you won’t see screws or nails when you’re done.

Frequently Asked Questions