Federal Wood Post Cap (4x4, 5x5, 6x6) Cedar, Redwood, Mahogany

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Wood Type: Cedar
Post Size: 3-1/2"
Sale price$19.00 Regular price$22.33


The top-selling Federal wood post cap is made in the USA and features a classic pyramid top design with rounded edges. Each handcrafted post cap is sanded smooth and made from the finest materials: western red cedar, all-heart clear vertical grain redwood or kiln-dried African mahogany. Slips over the top of your posts for easy DIY installation. 

The Federal post cap is fabricated to fit various 4x4, 5x5, and 6x6 posts. See table below for actual product dimensions.

Click here for large posts measuring 7” to 10” square, in full and half sizes.

Custom sizes available: Call or email us at hello@idealgardenlights.com for details, pricing, and availability.

Product Details:

  • Qty: 1 wood post cap
  • Post Cap only - NOT a light
  • Materials:
    • Clear, Vertical Grain Cedar 
    • Clear Redwood
    • Kiln-dried African Mahogany
  • Cedar and Redwood must be treated prior to being installed
  • Slip-over style for easy installation
  • Made in the USA
  • Manufacturer: Nantucket Post Cap
  • One-year manufacturer warranty

Product Dimensions:

Order by post size: Measure the length and width of your post for the best fit. Post Cap opening will be 1/8" larger to allow the wood to naturally expand and contract.

*All measurements shown in inches. 

Post Size Opening Size Moulding Height Product Size (LxWxH)
3-1/2" 3-5/8" 1-1/2" 5.75 x 5.75 x 3 
3-3/4" 3-7/8" 1-1/2" 6 x 6 x 3 
4"  4-1/8" 1-1/2" 6.25 x 6.25 x 3 
4-1/2" 4-5/8" 1-1/2" 6.75 x 6.75 x 3 
4-3/4" 4-7/8" 1-1/2" 7 x 7 x 3 
5" 5-1/8" 1-1/2" 7.25 x 7.25 x 3
5-1/2" 5-5/8" 1-1/2" 7.75 x 7.75 x 3
5-3/4" 5-7/8" 1-1/2" 8 x 8 x 3
6" 6-1/8" 1-1/2" 8.25 x 8.25 x 3
6-1/2" 6-5/8" 1-1/2" 8.75 x 8.75 x 3


Post caps are made of clear, vertical grain, kiln-dried redwood, clear western cedar or Kiln Dried African Mahogany. These wood types are known for their beauty and durability in harsh environments. Cedar resists mold and mildew, plus its low density makes it less likely to swell, warp, cup or twist, as compared to other softer wood types.  

Product Care:

Nantucket wood products are sold in their "natural" state so they can be stained or painted to match or coordinate with any project. Because post caps are installed horizontally on top of the post, they receive the most sun exposure. Although you may leave cedar posts to weather naturally, to meet warranty requirements all cedar and redwood items must be treated prior to being installed. Apply an exterior urethane stain or paint to all surfaces, including inside and under the base, to ensure long life. Many semi-transparent seals are available for cedar to maintain its natural look, while still protecting the caps.


For a nail-free look, simply apply an exterior marine adhesive like 3M 5200 to the top of the post and slip the post cap over. Stainless steel finish nails may be used as an alternative.

Shipping: This product ships directly from the manufacturer's warehouse in Vermont. Caps are built after the order is received. Orders typically ship in 1-4 business days via UPS Ground and will arrive within 1-5 business days from the ship date. 

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