OZ-POST ISW- 850 34" Steel Post Anchor for 2-3/8" Diameter Round Posts - Individual or Cases of 6

Product Description

OZ-Post® ISW-850 Steel Post Anchor — Fits 2-3/8″ (2.375″ O.D.) Round Posts — 34″ Length

• No-Dig Post Foundation — Drive-in ground anchor for standard 2-3/8″ O.D. steel posts; set terminals, corners, or sign posts without digging or concrete
• Deeper Embedment vs. 24″ Models — 34″ overall length with a ~5″ top sleeve for added depth and stability on taller/windier runs
• Hot-Dip Galvanized Steel — Heavy steel, zinc-coated for long outdoor service; compression cap locks the pipe at grade
• Fast, Clean Installs — Drive with a manual or jackhammer driver kit; no forms, no cure time, minimal mess
• Field-Proven Performance — OZCO testing cites up to 120 mph wind-load for privacy fencing when properly installed

Want to install your steel posts faster, without pouring messy concrete? If so, then the OZ-Post ISW-850 Steel Post Anchors are the right tool for the job. These hot-dip galvanized anchors are made from heavy duty steel and are driven into the ground, either manually or with a jackhammer. Taking as little as 4 minutes per post, these anchors can be installed in a wide variety of ground types, including asphalt, clay, sand, and rocky soil.  The ISW-850 is 34" long, with a 5" sleeve, making it perfect for securing privacy fencing with steel posts. The larger fin profile provides a lot of surface area to bite into the ground and ensure that your posts don't move, and they have been tested to withstand up to 120 mph winds for privacy fencing.

ISW-850 anchors are designed to fit standard 2-1/2" chain link fence pipe, which has an actual outside diameter of 2-3/8". The compression collar slides down over the post and can be pounded into place with a sledge hammer or the cap driving tool (CDT-07). The collar keeps the posts in place and ensures that they cannot be pulled out of the anchor.

ISW-850 anchors can be driven completely into the ground, so that the top of the anchor is flush with the surface of the ground, or you can also leave a small part of the anchor protruding from the surface to make it easier to install the compression collar. 

OZ-Posts steel anchors are great for temporary projects too. They can be pulled out of the ground using the OZ-Puller and reused for different projects.

There are 2 ways to install ISW-850 Post Anchors:

1) Use the Manual Driving Kit (MDK-13), which uses its own weight & gravity to do most of the work of driving the anchor down into the ground. This is good for a small to medium number of posts.

2) Rent a jackhammer and purchase a Jackhammer Driver Kit (JDK-10) to drive your posts into the ground. This usually takes one person about 4 minutes per post, and is the most efficient way to install all OZ-Post post anchors.

Why Choose This

• Speed & consistency — Drive, drop, clamp; repeatable results that keep projects on schedule
• Cleaner jobsites — Minimal disturbance and no concrete washout
• Durability — Hot-dip galvanized body and elevated post base help mitigate corrosion risks

Specifications

Installation

Lay out post centers and call 811 to locate utilities. Using a manual or jackhammer driver kit, drive the ISW-850 to grade keeping it plumb. Insert the 2-3/8″ pipe fully, verify plumb, then set the compression cap (cap-driving tool recommended) until the post is clamped snugly. On rocky or bedrock sites, pre-drilling may be required; through asphalt is often feasible. Always follow local code for post spacing, height, and wind exposure.

Download the OZCO OZ-Post Steel Post Anchor Installation Instructions Here

Manufacturer’s Warranty

Buying Guide

• Choosing depth: Pick ISW-850 (34″) for taller/windier lines and general soils; for hard-packed soils or asphalt where a shorter, thicker fin can help penetration, see IS-600 (24″).
• Surface-mount alternative: Setting posts on slabs or wood/steel surfaces? Use the 238-IS/PB surface base.
• Tools: For fast, consistent cap setting, add the CDT-07 cap driving tool.

Frequently Asked Questions

What post size does ISW-850 fit?

Standard 2-3/8″ O.D. round steel pipe used on many chain link terminal posts.

How long is the anchor and sleeve?

The anchor is 34″ overall with an approximately 5″ top sleeve.

Do I need concrete?

No. This is a drive-in system designed to eliminate digging and concrete in qualifying applications.

Can it be driven through asphalt?

Often yes. Many installs can be driven through asphalt and compacted soils; very rocky sites may require pre-drilling or a different footing.

Is it wind-rated?

The manufacturer cites lab testing up to 120 mph for privacy fencing; always size to local code and conditions.

Comparison

Not sure whether the 34″ ISW-850 or 24″ IS-600 fits your soil and fence height? Contact us and we’ll help you choose anchors, drivers, and hardware for a clean, code-conscious install.