4X4 Post Cap │ White Slim Profile

Four by four White Slim Profile Pyramid Post Cap. Actual Measurements fit three and one half inch post.

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These white 4x4 post caps belong to the slimline series, our most affordable post cap design. Our company manufacturers our own fence post caps in a variety of styles, sizes, and design series. And we’re proud of the fact that all of the products we sell are made in the U.S.A. These plastic post caps serve two purposes: they will protect the top of your fence support posts, and they’ll give your entire fence or deck rail, a more sophisticated, elegant, and overall beautiful look.

View our installation instructions here.

4x4 Post Cap (3.5") - White Slim Profile

  • Fits a standard (Nominal) post. (3.5” x 3.5” up to 3.75" x 3.75").

  • Slim Profile caps slide down the post 3/4” and are 4.5” x 4.5” 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! 

Our white slimline 4x4 post caps are made of ASA resin, a hard plastic that is used in automobile and marine vehicle manufacturing. It is an ideal material to use for making plastic post caps because it’s strong and durable. It is also impact and UV resistant. You’ll never have to worry about fading, discoloring, or warping because the purchase of all ASA resin plastic post caps come with a ten-year guarantee against discoloration, fading, or warping.

ASA resin fence post caps are superior to wood post toppers because there’s no chance that water can seep under the post caps, and because it isn’t subject to alternating cycles of shrinking and expansion, a pattern that weakens wood and shortens its lifespan. Our plastic post caps cost much less than comparable wood fence post caps, and they last far longer than wood ones do, too. And unlike wood post caps which require lots of care, our plastic post caps will never need any maintenance.

The white 4x4 post caps in this slimline series are only available in the nominal size. Nominal is the term the lumber industry uses to describe wood that is cut to size in its green state. Wood that is referred to as green is wood that hasn’t been dried - either in a kiln or by allowing it to age. The white slimline 4x4 nominal fence post caps will fit posts that are between 3.5” x 3.5” and 3.85” x 3.85,” 

Our patented two-piece SNAP-CAP system ensures that installation is a breeze. The bottom part of the two-piece cap is a sleeve that slides ¾” down the post from the top. The plastic post cap toppers screw to the sleeve, but you’ll never see them once the installation is complete. AT the widest point, the plastic post caps extend out 4 ½” x 4 ½” from the side of each post.  

Frequently Asked Questions


 Order online or 770-808-0200 to order by phone.