OZCO T4-850 OZ-Post Anchor: 3-1/2" Square Post Foundation

OZCO T4-850 OZ-Post Anchor (3-1/2" Square) is a 34" heavy-duty anchor for 4x4 posts that need extra stability—taller fences, gates, railing posts, and exposed-frame projects. The long shaft and fin design help resist side loads and uplift, so posts stay straighter over time without the hassle of concrete piers.

It’s made from hot-dip galvanized steel for long-term outdoor performance and is approved for use with ACQ-treated lumber. Drive it with an Oz-Post manual or jackhammer driver kit, attach your 4x4 post, and start building.

Features & benefits

• 34"+ long anchor for 4x4 nominal posts (3-1/2" x 3-1/2")

• Deep embed for higher lateral and uplift resistance on tall or loaded posts

• Drive-in installation—no digging, no concrete, cleaner jobsites

• Hot-dip galvanized steel, suitable for ACQ-treated lumber

• Great for fences, railing posts, arbors, and other 4x4 structures

• Sold individually (1 post anchor)

Use the T4-850 when you want a deep 4x4 anchor that can handle taller posts and stronger loads.

Learn more at OZCO Building Products.