4x4 vs 6x6 Post Bases: Which VEVOR Bracket Fits Your Post?
Choosing a post base is not just about the label on the lumber. A nominal 4 x 4 wood post is typically smaller than 4 inches in actual cross-section, and the same applies to nominal 6 x 6 posts. This VEVOR family includes both 4 x 4 and 6 x 6 post-base configurations, plus 2-side and 4-side fixed designs, so the right choice depends on the actual post dimensions, the support style you want, and how many bases your project needs.
Which VEVOR post base fits a 4x4 or 6x6 post?
For nominal 4 x 4 lumber, these brackets list an internal size around 3.6 x 3.6 in and recommend posts around 3.5 x 3.5 in. For nominal 6 x 6 lumber, the listed internal size is about 5.6 x 5.6 in and the recommended post is around 5.5 x 5.5 in. Measure the actual post before ordering.
Compare All VEVOR Post Base Options →Key Takeaways
Nominal lumber size and actual lumber size are not the same.
Listed internal size is about 3.6 x 3.6 in for posts around 3.5 x 3.5 in.
Listed internal size is about 5.6 x 5.6 in for posts around 5.5 x 5.5 in.
The family includes both 2-side fixed and 4-side fixed configurations.
4x4 vs 6x6 Post Bases: What Size Actually Fits?
| Nominal Post | Listed Internal Size | Recommended Post Size | Available Fixed Styles |
|---|---|---|---|
| 4 x 4 in | Approx. 3.6 x 3.6 in | Approx. 3.5 x 3.5 in post | 2-side or 4-side fixed |
| 6 x 6 in | Approx. 5.6 x 5.6 in | Approx. 5.5 x 5.5 in post | 2-side or 4-side fixed |
The safest buying method is to measure the actual post cross-section instead of relying only on the nominal label printed on the lumber or project plan.
2-Side Fixed vs 4-Side Fixed Post Bases
2-Side Fixed
These configurations use the two-sided post-base shape shown in the product family. They are available in 4x4 and 6x6 nominal sizes, with multiple kit quantities for 4x4 projects.
4-Side Fixed
These versions use a more enclosed four-sided post-holder design. The 4x4 family lists a 3.6 x 3.6 in internal size, while the 6x6 version lists about 5.6 x 5.6 in internally.
How to Choose the Right VEVOR Post Base
01 · Measure the actual post
Measure both width and depth near the bottom of the post. Do not assume a nominal 4x4 is a true 4.0 x 4.0 in piece of lumber.
02 · Match 4x4 or 6x6 family
Choose the bracket family whose listed internal dimensions match your actual post size with the intended fit.
03 · Choose 2-side or 4-side fixed design
Compare the bracket shape, mounting access, and how enclosed you want the lower end of the post to be.
04 · Choose the kit quantity
This family includes 2, 4, 8, and 10-piece options depending on configuration. Count the posts in your project before choosing the pack size.
05 · Check the mounting surface
The product information describes hardware suitable for both concrete and wood-floor installations. Use the hardware and installation method intended for your exact surface and configuration.
Installation Notes Before You Drill
- Confirm post size and bracket fit before drilling the base location.
- Place the bracket where the post can remain aligned with the structure above.
- Use the supplied or specified fastening method that matches the mounting surface.
- Keep the post fully seated and centered inside the bracket before final tightening.
- For load-bearing structural work, follow applicable local building requirements and project specifications.
Common Buying Mistakes to Avoid
- Buying a 4x4 post base for a true 4.0 x 4.0 in post without checking the listed internal dimensions.
- Assuming 2-side and 4-side fixed versions are the same shape.
- Choosing a kit quantity before counting every post in the project.
- Mixing 4x4 and 6x6 brackets in the same project without checking each actual post size.
- Ignoring the mounting surface when planning anchors and fasteners.
Quick Selection Checklist
- I measured the actual post width and depth.
- I selected the 4x4 or 6x6 bracket family based on actual dimensions.
- I chose between 2-side and 4-side fixed construction.
- I counted the number of post bases required.
- I confirmed the mounting surface and fastening method.
VEVOR Post Bases: 4x4 & 6x6 Options
Compare current prices, pack quantities, 2-side vs 4-side designs, and exact SKU dimensions before ordering.
View All Post Base Options →Frequently Asked Questions
For structural applications, confirm post dimensions, mounting conditions, loads, and local project requirements before installation.