It is important to have the well suited 6x6 flat post cap. Let’s take you step by step, type by type, and find the best 6x6 flat post cap for you.

Our review process: Show/Hide

Our Top Picks:

Best Overall: Buy: Nuvo Iron 6X6 Flat Post Cap READ REVIEW

Best For Perfect Fit: Buy: Jsp Manufacturing 6X6 Flat Post Cap READ REVIEW

Best For Solid Copper: Buy: Ht 6X6 Flat Post Cap READ REVIEW

Best For Stainless Steel: Buy: Deck Depot 6X6 Flat Post Cap READ REVIEW

Best For Worth The Money: Buy: Atlanta Post Caps Post Cap Base READ REVIEW

Best For Wooden Fence Post: Buy: Plum Fittings 6X6 Flat Post Cap READ REVIEW

Best For Great Protection: Buy: Atlanta Post Caps 6X6 Flat Post Cap READ REVIEW

Best Simple Design: Buy: Captiva 6X6 Flat Post Cap READ REVIEW

Best Clean Design: Buy: Deckorators 6X6 Flat Post Cap READ REVIEW

Best Overall: Nuvo Iron 6X6 Flat Post Cap

Buy on Amazon

The look and feel of these caps are consistent with the high quality we're used to from the rest of Nuvo Iron's lineup. The Nuvo Iron 6X6 Flat Post Cap is highly recommend, It looks really nice, it is used even on amazon and has a good design. Extends the life of your fence or deck post while preventing cracking, splitting and weathering. Also, it comes with quality screws, it looks nice, it installed easily and has a decorative pyramid design.

The cap is made for good value, is good for black plastic, it is great for brand name and has a durable design. Finally, the nuvo iron 6x6 flat post cap works well. is made with excellent quality, It is designed for super high quality and has a great shape.

Most customers opine that the cap is designed for posts with true dimensions of 5.5"x5.5. In addition, they also found that the cap would fit either a full 4"x6" or a nominal 4x6 (3-1/2" x 5-1/2") post by using the included adapter. In addition, a few say that the nuvo iron pcp14 cap fits over a rough sawn true 6x6 post, and measures 6.1 " x 6.1 " internally. Therefore, buyers were eager to recommend it to friends and families.

• They look great and they are a true 6x6 in size.
• The cap would fit a post 5 1/2 inch square perfectly.
• Its sleek, elegant and simple pyramid design will complement any project or space.
• This is a very good - quality aluminum cast cap.

Best For Perfect Fit: Jsp Manufacturing 6X6 Flat Post Cap

Buy on Amazon

The Jsp Manufacturing 6X6 Flat Post Cap is suitable and reliable and fits well with your daily purpose. The jsp manufacturing 6x6 flat post cap is much cheaper and it is white. Make sure this fits by entering your model number. Also, it can be painted, must use paint that adheres to plastic.

Most importantly, the jsp manufacturing 6x6 flat post cap is highly recommend, is easy to attach and it adds additional decking.

Most customers agree that the cap is easy to glue down on top of posts, and should make the posts last longer with no water sitting on top. Further, they say that the cap can be painted, must use paint that adheres to plastic. Also, a few also found that the cap can be secured with nails or glue, should be pre-drilled if secured with nails. With no doubts, this product passed the test and had very satisfied buyers eager to share their experience.

• 6X6 (5-5/8" x 5-5/8") plastic black fence post caps - quantity: 10 pack.
• This fits with the inside diameter of the cap.
• This as well, fits well and has a durable design.
• This is used for thick plastic and it is solar.

Best For Solid Copper: Ht 6X6 Flat Post Cap

Buy on Amazon

If you often find yourself confused about the appropriate and satisfactory cap, the 6x6 flat post cap should be your first option for buying. The 6x6 flat post cap is made for easy installing and it is designed for solid copper construction. Easily installs by applying outdoor adhesive on the inside lip of the cap. Further, this is designed for solid copper and it makes for a very nice quality.

Most importantly, the Ht 6X6 Flat Post Cap is 5-5/8" with a 1/2" lip and an overall height of 2-1/8.

Almost all customers opine that the cap is perfect and looks great. In addition, they say that the cap looks much better than any plastic version. Further, a few strongly agree that the cap fits a standard 6x6 that you would buy at any lumber outlet. In short, at the price, they believe that they got a steal of a deal with it.

• Measurements: base opening is 5-5/8" with a 1/2" lip and an overall height of 2-1/8".
• This looks awesome, is functional and as well.
• They fit tightly, work great and it is made with pure copper.
• This is great with great quality, is easy to attach and it is inexpensive.

Best For Stainless Steel: Deck Depot 6X6 Flat Post Cap

Buy on Amazon

The Deck Depot 6X6 Flat Post Cap is capable of outshining several other caps featured in this list in overall features for the price point. The deck depot 6x6 flatpost cap is easy to use and it comes with the correct size. Installs easily with a little adhesive applied to the inner flanges of the post cap. Also, the cap is made worth the price and it is perfect for great protection.

The cap measures 5 1/2" x 5 1/2. Moreover, it comes with solid powder coated aluminum construction, This matte bronze 6x6 post cap is sure to enhance and protect any outdoor deck or fence post for years to come. Finally, the deck depot 6x6 flat post cap is highly recommend, fits perfectly and it provides great value.

Almost all buyers found that the cap is easy to install but make sure your post is really 5 1/2. In addition, they say that the cap looks great, They’re a little thinner and flimsier than expected, but it actually helped mold some of the posts. Moreover, they say that the cap is easy to glue and they look good too.

• This fits nicely on a standard 6" post.
• This is perfect and is very thick aluminum.
• Solid matte bronze powder coated aluminum construction.
• This allows for a great fit, has a good snug fit and it is for stainless steel.

Best For Worth The Money: Atlanta Post Caps Post Cap Base

Buy on Amazon

We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a convenient and appropriate cap. The Atlanta post caps post cap base is exactly that - it's a simple cap that hits all the right notes. The Atlanta post caps post cap base can be used on automobiles and marine vehicles. The Manufacturer says: Although they do not require painting, we recommend using outdoor spray paint intended for plastics to give your caps a durable, long-lasting finish. Further, it is made of durable plastic and it is worth the money.

The cap offers substantial improvements over plain wood. Lastly, the Atlanta Post Caps Post Cap Base can see the bottom of your post cap base is smaller than the top of the post cap, and the two cap supports should be on the top of the base.

Most buyers opine that the cap is easy to install and has tabs on the inside to adjust the fit prior to screwing it to the post and then the top cap piece snaps on. And, they say that the cap fits on the post great and looks very nice. Overall, the tone of buyers is very positive and we believe that the cap suits the purpose.

• This is perfect for fence posts and it fits perfectly.
• Simply press and the cap will 'snap' firmly into place.
• This fits without nailing in and it is not a good secure fit.
• It looks good on the pole but it is made very cheaply.

Best For Wooden Fence Post: Plum Fittings 6X6 Flat Post Cap

Buy on Amazon

Compared with other caps in this category, the Plum Fittings 6X6 Flat Post Cap has a convenient design. The plum fittings 6x6flat postcap built to last, It fits very well and has great style. These sleek and durable post caps come in a pack size of 32, so you can easily tackle large fencing projects. These black post caps are designed to fit 6"x 6" pressure treated wood posts and have a pre-cut nail hole to make installation a breeze.

The cap features a black polypropylene construction that is both weather and uv resistant, for long-lasting color and performance. Most importantly, the plum fittings 6x6 flat post cap fits externally onto the fence post and only requires one screw for sturdy installation.

One customer says - "The hole in the top requires some work to make the cap function as it should. ". Most customers quickly discovered that the cap measures 2.5" x 2.5 plus it has a reflective finish that paint will not adhere to well. Overall, most buyers agree that the cap suits them best, and no one questions it.

• Good brand reputation.
• Lot of satisfied buyers.

Best For Great Protection: Atlanta Post Caps 6X6 Flat Post Cap

Buy on Amazon

Next on the list, we've got yet another cap that manages to win our hearts. It's the Atlanta post caps 6x6 flat post cap and it's widely considered as the cap that has the most suitable features. The atlanta post cap 6x6 flatpost cap is made for great fit, It fits well and has a good design. The manufacturer says: We believe so firmly in the superiority of Asa resin that we give you a 10. And, the cap is a hard plastic that is the same material that car and marine vehicle manufacturing companies use.

The cap is built with great quality, It is white and has great style. Most importantly, the Atlanta post caps 6x6flat post cap looks nice, it is decorative and has a durable design.

Almost all customers found that the caps are light weight, durable and very easy to install. In addition, they strongly agree that the cap looks brand new 2 years later. Furthermore, a few also found that the cap looks great but are very difficult to get and keep straight on the wood posts. So, customers were very happy to recommend it to friends and would-be buyers.

• The cap fits well even when the posts are cut at an angle.
• This fits over a full size 6 x 6" post.
• It looks really nice, plus it is best to use pliers.

Best Simple Design: Captiva 6X6 Flat Post Cap

Buy on Amazon

If you often find yourself scrambling for an appropriate and satisfactory cap, Captiva 6X6 Flat Post Cap is your end point. The captiva 6x6 flat postcap is designed to provide the best protection from water. Make sure this fits by entering your model number. Also, the cap is not permanent without protective spray (sold separately), will patina to a rustic green color.

Most importantly, the captiva 6x6 flat post cap fits 5-1/2" square posts plus it is unmatched on the market.

Most buyers agree that the cap is easy to install and looks like it will last.

• 3/4" lip extends down the side of the wood post for ultimate fence post protection.
• 100% copper will not rust; don't get fooled by fake copper.
• Seamless 1-piece design; screws included; 20-gauge copper, thickest on the market.
• Fits 5-1/2" square posts; interior dimension is 5-5/8".

Best Clean Design: Deckorators 6X6 Flat Post Cap

Buy on Amazon

We know from years of feedback from readers, amazon sellers, and family and friends what most people want in a convenient and appropriate cap. The Deckorators 6X6 Flat Post Cap is exactly that - it's a simple cap that hits all the right notes. The deckorators 6x6 flat post cap is used for fence posts, It is hassle-free and has a classic design. Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known by the state of California to cause cancer. The new classic flat top post cap adds a simplistic touch to deck posts.

Above all, the deckorators 6x6 flat post cap is strong and naturally resists rot and decay for long-lasting performance.

They also found that the post cap fits a nominal 6 - in x 6 - in wood post.

• This fits perfectly, it fits very well and has an attractive design.
• Good investment for the long term.