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Four black powder-coated carbon steel post bases with square tubes and wide flat plates

VEVOR

VEVOR 4×4 Post Base 4 Pcs 3.6″ Inner Black

SKU CH-S5NK-K9HZA

Four carbon-steel post bases with 3.6 inch inner size and 5.5 inch base plates include mounting hardware for 3.5 inch posts

  • TypeOther Appliances
  • Width11.02
  • Secure, wobble-free support from fully enclosed 3.78 × 3.78 in bases
  • Corrosion-resistant powder-coated carbon steel with 0.08 in wall thickness
  • Fits 3.5 in posts via 3.6 in inner sleeve and 5.5 in base footprint
  • Quick drill-and-screw mounting using included M8 and wood fasteners
  • Complete 4-piece kit with 24 self-tapping screws, 24 expansion bolts, 32 wood screws and wrench

4×4 Post Base Kit — 4 Pieces

This set includes four carbon-steel post bases designed for 3.5-inch square timber posts. Each bracket has an internal tube size of 3.6×3.6 inches and a bottom cross-section of 5.5×5.5 inches. The fully enclosed design prevents wobble and delivers stable support for deck, pavilion or railing projects. A black powder coating adds corrosion and rust resistance for extended outdoor life.

Installation Limits and Fastener Count

Mounting requires drilling holes and driving the supplied M8×60 self-tapping screws, 12×60 expansion bolts, M8 washers and M5×25 wood screws — 24 of the first three types and 32 wood screws in total. An 8–13 mm double-open-end wrench is included for tightening. The 2 mm wall thickness and fixed hole pattern mean the bracket suits only posts that match the 3.6-inch inner dimension; larger or smaller posts cannot be secured.

Build Quality and Daily Implications

Carbon-steel construction with a 0.08-inch wall gives each base a solid feel, and the kit weighs 11 lbs (5.0 kg) altogether. The powder-coated finish resists weathering without extra treatment. Because the brackets are fully enclosed, posts sit flush inside the tube, simplifying alignment but preventing any post-size adjustment after installation. The 5.51-inch cube footprint demands adequate concrete or timber surface area for the base plate.

Highlights

  • Secure, wobble-free support from fully enclosed 3.78 × 3.78 in bases
  • Corrosion-resistant powder-coated carbon steel with 0.08 in wall thickness
  • Fits 3.5 in posts via 3.6 in inner sleeve and 5.5 in base footprint
  • Quick drill-and-screw mounting using included M8 and wood fasteners
  • Complete 4-piece kit with 24 self-tapping screws, 24 expansion bolts, 32 wood screws and wrench

Specifications

TypeOther Appliances
Width11.02

Questions about this item

Should I choose the 4-piece kit or a single bracket for my deck?

The kit supplies four identical post bases, each with a 3.6-inch inner tube and 5.5-inch base cross-section, so one kit covers four 3.5-inch posts.

Will the 3.6-inch inner size fit my nominal 4×4 lumber?

The internal dimension is 3.6 inches square, matching standard 3.5-inch dressed posts and leaving a small clearance for easy insertion.

What do the M8 and M5 screw sizes mean for installation?

The package includes 24 M8×60 self-tapping screws with 12×60 expansion bolts for concrete, plus 32 M5×25 wood screws for timber, all with washers and an 8–13 mm wrench.

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