Federal Wood Post Caps by Nantucket Post Cap

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Since 1988, The Nantucket Post Cap Company has been creating fine post caps, finials, arbors, gates, benches, tables, and pergolas made out of the highest grade of redwood and cedar. All their high quality Post Caps are made from the best grade of clear, all heart, vertical-grain Redwood or Clear Western Red Cedar, so you can choose the wood species that works best for your fencing, deck, or other landscaping project.

Both Red Cedar and Redwood have great resistance to moisture, decay and insect damage. These wood types also have exceptional dimensional stability. Your Post Cap will lay flat, stay straight, retain fasteners, and provide a firm base for many types of stains and paints, giving you a post cap that will hold up to the elements for years to come.

Post caps are decorative structures covering the tops of wooden posts on outdoor decks and wooden fences. Not only do they enhance the outdoor wooden structure, but they protect the top of the wooden post from cracking and splintering. Post caps will also cover up any uneven mill cuts or other eyesores on top of the fence or deck post. Available for nominal post sizes of 4x4, 5x5, 6x6, 7x7, 8x8, 9x9, and 10x10.

Federal Post Cap:

  • Fits standard wood posts from 3-1/2" x 3-1/2" up to 10" x 10"
  • Comes in Western Red Cedar and Kiln-Dried Redwood
  • Also available in custom specialty sizes - please call or email for pricing

Some post cap sizes are special order items.  Please see shipping information below.

How to choose the correct post cap size:

Nantucket Post Cap LogoNantucket Post Caps are sized according to the actual physical measurement of your post.  All post caps are made 1/8" larger on the opening then the actual post size you specify.  For example, if your 4x4 standard post truly measures 3-1/2" x 3-1/2", then you would choose that size and your cap would come with an inside measurement of 3-5/8" x 3-5/8". 

All Nantucket Post Cap products are made in the U.S.A.


Post caps for 3-1/2" to 6" posts usually ship within 2-3 business days.  Larger sizes are special order and usually ship within 5-7 business days.

Please see our return policy for additional details.