Product Description
OZ-Post® T4-600 Wood Post Anchor — 4″×4″ (Fits 3-1/2″×3-1/2″) — 24″ Length
- No-Dig Foundation for 4×4 Posts — Drive-in ground anchor for standard dimensional lumber (actual 3-1/2″ square)
- Engineered for Hard/Dense Soils — Shorter, thicker fin profile improves penetration in hard-pack, rocky, asphalt, or root-laden areas
- Rugged, Long-Lasting Build — Hot-dip galvanized steel; suitable for contact with pressure-treated lumber
- Fast, Clean Install — Set posts without digging or concrete; build immediately after driving
- Chosen by Contractors — Ideal for picket & garden fences, signs, mailboxes, and similar light-to-medium-duty projects
The OZ-Post T4-600 is a 24″ drive-in anchor sized for 4×4 wood posts. Compared to the deeper T4-850, the T4-600’s fin is 30% shorter and 50% thicker to enhance driveability where soil is dense or obstructed—perfect when excavation is impractical. For taller fences, gate posts, or higher wind exposure, step up to the deeper T4-850 (34″). Installing a simple mailbox or similar? See the MB-24 Mailbox Anchor (27″).
Why Choose This
- Cleaner jobsites — No digging, no concrete, minimal mess
- Drive-and-build workflow — Set posts and start framing the same day
- Soil versatility — Optimized fin geometry for hard-packed and obstructed ground
Specifications
| Model | T4-600 (Item #30180) |
| Fits Post Size | 4″×4″ nominal wood post (actual 3-1/2″×3-1/2″) |
| Anchor Length | 24″ overall |
| Top Sleeve Length | Approx. 6″ |
| Fin Geometry | 30% shorter and 50% thicker than T4-850 (for dense/obstructed soils) |
| Material / Finish | Hot-dip galvanized steel; compatible with pressure-treated lumber |
| Approx. Weight | ~5 lb (each) |
| Included | T4-600 post anchor (post fasteners not included) |
| Driver Options | Manual Driver Kit (MDK-13) or Jackhammer Driver Kit (JDK-10) |
| Typical Usage | Picket & garden fences, mailboxes, small signs, light landscape structures |
Installation
Lay out post locations and call 811 to locate utilities. Drive the T4-600 to grade with a manual driver or jackhammer driver kit, keeping it plumb. Insert the 4×4 post and fasten through the sleeve per your fastening method. In applications where securing holes end up below grade, seal with polyurethane adhesive to reduce moisture intrusion. Use the deeper T4-850 when posts are tall, carry higher loads, or soil is soft.
Resources: Manufacturer’s Warranty
Buying Guide
- Soil & load: Choose T4-600 for dense/obstructed soils and light-to-medium-duty projects. For taller posts, gates, or windier sites, step up to T4-850 (34″).
- Post length: No concrete means you can often use shorter posts than dig-and-set methods.
- Tools: Small runs are manageable with a manual driver; larger jobs go faster with a jackhammer driver kit.
Frequently Asked Questions
- Do I need to pour concrete?
- No. The T4-600 is a drive-in anchor intended to replace digging and concrete in qualifying applications.
- When should I pick the T4-850 instead?
- Use the deeper T4-850 for taller posts, gate posts, higher wind exposure, or softer soils.
- Is it compatible with pressure-treated lumber?
- Yes. It is suitable for contact with modern treated lumber.
- Can I use it in asphalt or rocky ground?
- Yes. The T4-600 is optimized for hard-packed soils, asphalt, rocky conditions, or driving into old/rotten posts.
- Are fasteners included?
- No. Select exterior-grade screws or bolts appropriate for your application.
Comparison
| Option | Strengths | Considerations | Best For |
|---|---|---|---|
| T4-600 (24″) (this item) | Optimized fin for hard/dense soils; quick no-dig installs | Shallower embedment than T4-850 | Pickets, garden fences, mailboxes, small signs |
| T4-850 (34″) | Deeper embedment for taller posts and higher loads | More driving effort | Fence lines in softer soils; gate posts; windier sites |
| MB-24 (27″) | Great for simple, light-duty posts | Not intended for taller/heavier loads | Mailboxes and similar projects |
Need help choosing between the 24″ and 34″ OZ-Post anchors for your soil and fence height? Contact us and we’ll help you plan a clean, durable installation from anchor to fasteners.
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Product Reviews
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Oz-post t4-600
Works like a charm. Jack hammer is definitely needed. Pray that you don't run into a boulder underground...Works flawlessly when you don't have rocks in the ground like I do. Thanks..
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OZ-Post anchors
I have used these post anchors for years in many different applications. Bought a used electric jack hammer from a rental business to install them. Super happy with how they speed up the process of putting in fences and decks. Had to pull a few out to move in a building recently--took a skid steer to get them out of the ground! Great product that not enough people know about!
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Post Anchors
Ordered these for a small project for a friend. Shipment late one day due to missed connection enroute. Product great! Easy to install and rigid support for walkway/small step railing. Would recommend for almost any post application
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post sleeve
Good quality and good price.
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Post Holder Purchase
The post holders are the easiest thing I've ever done for putting up a fence. The quality is excellent and with) l last for years. I've already recommend this product to several friends.
