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Internet # 205824747

Model # 4080

Store SKU # 1001308193

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4 in. x 4 in. Plastic Post Anchor

$17.98
  • Experience an easy stair solution, no more complex cuts
  • Perfect for any decks, patios, and indoor/outdoor spaces
  • Robust steel for superior strength and lasting durability
  • View More Details

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Return this item within 90 days of purchase.

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Product Details

About This Product

Combining strength, beauty and versatility, our range of Composite Plastic Post Anchors allow professional builders and DIY users to build a strong foundation for any deck. This durable post anchor is designed to attach 3.5 in. x 3.5 in. wooden post to any deck surface. Constructed from highly durable composite plastic for peace of mind with an attractive black finish that will complement any outdoor setting. Stainless steel fasteners are included in the package for a quick and easy installation. This plastic post anchor is not suitable for applications higher than 30 in. (762mm) from the ground.

Highlights

  • Designed to be used with 3.5 in. x 3.5 in. wooden posts
  • High-quality composite plastic construction
  • Attractive black finish
  • Stainless steel fasteners included
  • Not suitable for applications higher than 30 inches (762mm) from the ground
  • California residents see Prop 65 WARNINGS
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 205824747

Model # 4080

Store SKU # 1001308193

Additional Resources

Shop All PEAK
From the Manufacturer

Specifications

Dimensions: H 4 in, W 5.9 in, D 2.5 in

Dimensions

Nominal Post Size (in.)

4x4

Product Depth (in.)

2.5 in

Product Height (in.)

4 in

Product Width (in.)

5.9 in

Details

Base Type

Post Anchor Base

Connector Finish

None

Fasteners Included

Fasteners Included

Features

No Additional Features

Gauge

3

Material

Plastic

Material Connector Compatibility

Wood to Wood

Package Quantity

1

Product Weight (lb.)

1.29 lb

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

For more information, please contact Peak Products customer service at 1-877-883-7325

Questions & Answers

Why are these not suitable for use over 30” off the ground?
ByJul 7, 2026
1 Answer | 
Answer This Question

Hello Flora, thank you for your question. We do not have compliance documentation to certify the anchors as part of a guard rail, or to support any horizontal loads which are required for projects that are 30" or more off the ground. Please don't hesitate to reach out to us should you have any other questions. You can reach us at 1-877-883-7325 or cservice@peakproducts.com

By|Jul 10, 2026


    Is it neccesary to use Sleeve covers
    ByMay 5, 2026
    1 Answer | 
    Answer This Question

    Hi Jeff, Thank you for your question! Sleeve covers are not required for use with our 4 in. x 4 in. Plastic Post Anchor. Our PEAK railing posts are designed as a complete system and do not use sleeve covers as part of the installation. If you have any questions about your specific setup, feel free to contact our Customer Service team at 1-877-883-7373—we’d be happy to help. Thanks again,

    By|May 5, 2026


      How many comes in a pack?
      ByMay 3, 2026
      1 Answer | 
      Answer This Question

      Hello FloJayKen, Thank you for your question. The package includes 1 post anchor per pack, along with stainless steel fasteners for a quick and easy installation. If you need any additional information, feel free to contact us at 1-877-883-7325, and we’ll be happy to help.

      By|May 7, 2026


        Can they be used on the ground?
        ByOct 30, 2025
        1 Answer | 
        Answer This Question

        Hello Jimmy, thank you for your question. The 4 in. X 4 in. Plastic Post Anchor can be used on hard surface only.

        By|Oct 31, 2025


          what size and type of screw or bolt?
          BySep 10, 2025
          1 Answer | 
          Answer This Question

          Hello Errol, thank you for your question! Please note that screws are provided along with our post anchors. They are 1.5" Robertson screws which attach the post to the anchor and 2.5" x 3/8" Hex head screws which attach the anchor to the surface. Should you have any other questions please don't hesitate to reach out to us at cservice@peakproducts.com or at 1-877-883-7325.

          By|Jun 21, 2026

            (1)

            What is the best way to mount them on composite stair decking for a hand rail and should bolts or screw lags be used? Also what size because the ones I bought there don't have any included ! Thanks
            ByJun 9, 2025
            1 Answer | 
            Answer This Question

            Hello Rick, thank you for your question. We will need further details for your project. Please reach out to our Customer Service team at 1-877-883-7325 so that we can provide an appropriate solution for your project.

            By|Jun 12, 2025


              What size fasteners are best for this?
              ByApr 18, 2025
              1 Answer | 
              Answer This Question

              Hello Martin, thank you for your question. The fasteners are already included with the plastic post anchor. Please reach out to our Customer Service team at 1-877-883-7325 if you have further questions.

              By|Apr 21, 2025


                Are these made in the U.S.A.?
                ByFeb 24, 2024
                1 Answer | 
                Answer This Question

                Hello Dennis, thank you for your question. These are made in China.

                By|Jan 2, 2025

                  (1)

                  Viewing 1-8 of 61

                  Customer Reviews

                  4.6 out of 5

                  • 4.6 out of 309 reviews
                  • 91% recommend this product
                  Filter by:
                  Showing 1-10 of 309 reviews
                  Easy to install, holds the 4x4 in place and looks good. Solves the problem of where to attach the 4x4. Good product.
                  by
                  • Verified Purchase
                  Provided fasteners are bad and need to be replaced
                  While anchors themselves looks sturdy at first glance the aluminum deck fasteners are absolute useless. See attached photo. They cannot bear any load at all and that's something they should! I had to go to the hardware store and buy good fasteners. Now I am worrying about actual anchors how long they will last....
                  by
                  Response from Product ExpertMay 31, 2023
                  Hello Dmitry, thank you for your comments. The anchoring fasteners supplied are 1/4” x 2-1/4” long, and are made from corrosion resistant stainless steel. We recommend drilling pilot holes to reduce the torque load applied to the fastener when installing, and to not over-tighten. To create a water-tight seal, coat the fastener with some non-corrosive silicone caulking prior to installing. This also lubricates the fastener for easy installation. Remember to ensure your project complies with applicable building codes in your area. Please feel free to give our customer service team a call at 877-883-7325 at your convenience should you have any additional questions. Thank you for your support, Dmitry!
                    what a disappointment!!
                    I am disappointed with this. I took the time and money using these which were easy, looks nice, but, after a few months they started to crack around the mounting screws on the sides. I do not feel like they were over tightend. Out of 18 mounts, i would say around 15 are cracked. This would be a major task to replace them with something else. I will not use these again
                    by
                    Response from Product ExpertApr 19, 2023
                    Hello Dale, we apologize that the product did not meet your project requirements. Please contact us directly at our toll-free number +1 (877) 883-7325 to discuss this matter further. Thank you.
                      • Recommended
                      Pressure Treated Posts
                      Great product for attaching posts to stone but I did have to shave the pressure treated post to get it to fit. And then paint the post again.
                      by
                      Response from Product ExpertMay 17, 2023
                      Hello Teeinep, thank you for your support. We appreciate you sharing your experience. Please remember to ensure your project complies with applicable building codes in your region.
                        • Recommended
                        Post holders
                        I was skeptical but I wanted to build my deck without post all the way to the ground. I just cleared trees and had massive roots so I couldn't space my post the way I wanted. I used these and was surprised how Ridgid they were.I could move them before bolting them down so I would get a good tight fit on my railing. Very pleased with the results and I would recommend them.
                        by
                        Response from Product ExpertMay 17, 2023
                        Hello, Thank you for your valuable feedback and support. Please ensure your project complies with applicable building codes in your region. Thank you!
                        • Verified Purchase
                        • Recommended
                        4 found this review helpful
                        Deck Post
                        Very good product. I purchased 13 or 14 for deck post. The post do not wobble at all.
                        by
                        Response from Product ExpertMay 17, 2023
                        Hi Ted! Thank you for your support. Please be reminded to ensure your project complies with applicable building codes in your region. Thank you!
                        • Verified Purchase
                        1 found this review helpful
                        Building a guard rail around my attic steps opening, using these to attahs 4x4s. I had to trim 4x...
                        Building a guard rail around my attic steps opening, using these to attahs 4x4s. I had to trim 4x4s as they swell up from treatments.
                        by
                        Response from Product ExpertMay 17, 2023
                        Hello Thunder, thank you for your feedback. Please ensure your project complies with applicable building codes in your region. Thank you!
                        • DIY
                        • Verified Purchase
                        • Recommended
                        Post caps make construction easy
                        Worked great with the treated posts, the veranda balusters and the solar lights. Very sturdy and easy to use.
                        by
                        • Verified Purchase
                        • Recommended
                        This post mount is a awsome product. Is to use and make the post strong.
                        This post mount is a awsome product. Is to use and make the post strong.
                        by
                        • Verified Purchase
                        • Recommended
                        1 found this review helpful
                        The plastic anchors are heavy duty, lightweight, and easy to use.
                        The plastic anchors are heavy duty, lightweight, and easy to use.
                        by
                        • Verified Purchase
                        • Recommended
                        2 found this review helpful
                        Showing 1-10 of 309 reviews