7x7 Flange - IF73
In stock
The IF73 (7x7 Post Saddle for 89 mm ground screws) is a robust, hot-dip galvanized steel adapter tailored to bolt onto the reinforced top cap of 89 mm (3.5" nominal) metric ground screws, providing a secure cradle for a nominal 7x7 (175 × 175 mm actual, or equivalent oversized North American timber) post in heavy timber-frame setups like large pergolas, timber-frame gazebos, commercial canopies, and elevated walkways.
Forged from 12–15 mm S355 structural steel with fully welded construction and integral 10 mm gusset plates for enhanced shear resistance, it incorporates a spacious 190–210 mm tall square pocket with densely spaced 16–18 mm pre-drilled holes on 60 mm grids across all four reinforced sides to accommodate M16–M20 heavy lag screws, through-bolts, or proprietary timber connectors, paired with a 6- or 8-bolt (M16–M20) base flange aligned to the standard 89 mm ground screw cap geometry from KRINNER Pro Line, Stopper-Fundament.
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Specifications
Specifications
Product Details
Product Details
Materials & Care
Materials & Care
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7x7 Flange - IF73
- Zero Concrete Needed
- Rot-Proof
- ICC-ES Certified
7x7 Flange - IF73
- Bolt-On, Zero-Weld Simplicity 10 web pages
- Nationwide Code Compliance
- Direct Heavy-Duty Mounting
Our standard shipping rates apply to all orders, with delivery handled by trusted carriers such as USPS, UPS, or FedEx depending on your location and selected speed. Shipping costs are calculated at checkout based on weight, dimensions, and destination. Once your order ships, you’ll receive a tracking number so you can follow its journey right to your door. We process and dispatch orders Monday through Friday (excluding holidays), and most in-stock items leave our warehouse within 1–2 business days.
We want you to love your purchase, which is why we offer a hassle-free 30-day return window from the date of delivery. Items must be returned unused, in the original packaging with all tags and accessories included, and in the same new condition in which they were received. A 25% restocking fee will be applied only if the product shows signs of use or has been removed from its original packaging. Simply contact our support team for a return authorization, ship the item back to us (you cover return shipping), and once we receive and inspect it, we’ll issue a refund to your original payment method minus any applicable restocking fee. Your satisfaction is our priority—shop with confidence!
Ground Screws are Best For
Deck Foundations
Deck Foundations
Perfect for residential and commercial decks where speed and precision matter. Ground screws eliminate digging and concrete, allowing same-day installation with immediate load-bearing capacity—ideal for tight schedules and clean job sites.
Fencing & Posts
Fencing & Posts
A fast, consistent solution for fence posts, gate systems, and signage. Ground screws provide straight, stable anchoring without the variability of hand-dug holes, reducing labor while improving alignment and long-term durability.
Pergolas & Outdoor Structures
Pergolas & Outdoor Structures
Ideal for pergolas, pavilions, and shade structures where aesthetics and structural integrity are both critical. Ground screws create a clean foundation solution with no visible concrete and excellent long-term support.
Solar Installations
Solar Installations
Widely used in ground-mounted solar arrays due to rapid deployment and minimal environmental impact. Ground screws allow installers to avoid concrete, reduce site disturbance, and maintain adjustability during layout and install.
Temporary or Modular Structures
Temporary or Modular Structures
Excellent for projects that may need to be removed or relocated, such as event structures, temporary buildings, or jobsite offices. Ground screws can be unscrewed and reused, making them a flexible and sustainable foundation option.
American Ground Screws vs Concrete Footings
| Feature |
American Ground Screws
Recommended
|
Concrete Footings | Helical Piers | Pier Blocks | Sonotube Footings |
|---|---|---|---|---|---|
| Installation Time | Minutes per screw | 24-48 hours cure time | Moderate | Quick | 24-48 hours cure time |
| Equipment Required | ✓ Handheld driver | Mixing tools, forms | Heavy machinery | Minimal | Mixing tools, tubes |
| Soil Disruption | Minimal | Extensive excavation | Moderate | Minimal | Moderate excavation |
| Environmental Impact | Low carbon | High carbon footprint | Moderate | Moderate | High carbon footprint |
| Removability | ✓ Fully reversible | Permanent | Difficult | Easy | Permanent |
| Load Capacity | Excellent | Excellent | Excellent | Limited | Good |
| Frost Heave Resistance | ✓ Excellent | Good if below frost line | Excellent | Poor | Good if below frost line |
| Weather Dependency | All season | Temperature sensitive | All season | All season | Temperature sensitive |
| Skill Level Required | Moderate | Professional recommended | Professional required | DIY friendly | Moderate |
| Material Waste | Zero waste | Excess concrete, forms | Minimal | Minimal | Cardboard tubes, excess |
| Adjustment After Install | ✓ Possible | Not possible | Limited | Limited | Not possible |
| Longevity | 50+ years galvanized | 50+ years | 50+ years | 20-30 years | 50+ years |
| Permit Requirements | Varies by jurisdiction | Typically required | Typically required | Often exempt | Typically required |
| Cost Efficiency | Competitive | Moderate to high | High | Low | Moderate |
| Suitable Soil Types | Most soil conditions | All soil types | All soil types | Stable soil only | All soil types |
| Labor Cost | Low | High | Very high | Low | Moderate |
| Immediate Load Bearing | ✓ Yes | No | ✓ Yes | ✓ Yes | No |
| Overall Recommendation | Best for fast installation, eco-conscious projects, and temporary or adjustable structures | Traditional choice for permanent structures | Heavy-duty commercial applications | Light-duty residential only | Budget-conscious permanent builds |
Ground Screw Foundation FAQs
Ground screws are steel foundation anchors that are installed into the soil using high-torque equipment to support structures without the need for concrete. They function similarly to helical piles but are specifically designed for fast installation and provide immediate load-bearing capacity.
These innovative foundation solutions are commonly used for a wide variety of applications including:
- Residential decks and outdoor structures
- Houses and permanent buildings
- Solar panel arrays and renewable energy installations
- Modular and prefabricated buildings
- Commercial signage and billboards
- Fencing systems
- Light structures and temporary installations
YES!! Ground screws offer numerous advantages over traditional concrete footings:
- Fast installation – Install in minutes with no excavation or curing time required
- Build immediately – No waiting days or weeks for concrete to set and cure
- Lower total cost – Significantly reduced labor, equipment, and material costs
- Versatile performance – Performs reliably in a wide range of soil conditions and climates, including winter installations
- Environmentally friendly – Lower carbon footprint with minimal site disturbance and no concrete waste
- Removable and reusable – Ideal for temporary or relocatable structures, with the ability to reuse screws
- Code-compliant – Evaluated under ICC-ESR-4226, helping streamline the permitting process with building officials
AGS ground screws are widely accepted across North America because they are evaluated under ICC-ESR-4226 for compliance with International Building Code (IBC) requirements. This evaluation report provides building officials with the technical documentation they need to approve ground screw foundations.
Final approval is determined by your local building department and project engineer based on specific factors including soil conditions, project loads, and local code requirements. We recommend consulting with your local building official early in the planning process.
Yes, ground screws perform exceptionally well in cold climates and frost-prone areas when properly installed. The key requirement is that at least two-thirds (2/3) of the thread must be installed below the local frost depth.
Because ground screws are embedded deep into the soil below the frost line, they are commonly used in northern regions where frost heave is a significant concern with traditional shallow foundations. Proper engineering design and correct embedment depth ensure long-term stability and prevent frost-related movement.
The load capacity of a ground screw depends primarily on two factors: soil conditions and the ground screw diameter. In many soil types, individual screws can support thousands of pounds of axial load when properly engineered and installed.
Specific load capacities are listed in Table 5, Page 13 of the ICC-ESR-4226 evaluation report. For your specific project, we recommend consulting with a structural engineer who can evaluate your soil conditions and determine the appropriate screw size and spacing for your load requirements.
Yes, ground screws can often be successfully installed in rocky soil, though some sites may require additional preparation. When encountering rocks or dense layers, installers may need to use pre-drilling techniques or remove obstructions.
Common methods include using rock augers or specialized drilling tools to penetrate dense or rocky layers before installing the screw. This ensures proper depth and alignment while maintaining the structural integrity of the installation. Review our detailed installation instructions for specific guidance on rocky soil conditions.
Our ground screws are manufactured from hot-dip galvanized steel specifically designed to resist corrosion for decades. The actual service life depends on soil conditions, moisture levels, and coating thickness, but properly specified ground screws are engineered for long-term structural use.
AGS warranties our ground screws for 25 years, with a life expectancy of 50+ years in most soil conditions. This makes them a durable, long-lasting foundation solution comparable to or exceeding traditional concrete footings.
Yes, one of the significant advantages of ground screws is that they can often be removed and reused. Unlike concrete footings which are permanent and create waste when removed, ground screws can be unscrewed from the ground using the same equipment used for installation.
This makes them an excellent foundation option for temporary structures, modular buildings, seasonal installations, and projects where minimal environmental impact is important. The ability to reuse ground screws also provides cost savings for future projects.
Yes, this is absolutely required. Call 811 from anywhere in the United States several days prior to installing your ground screws. Your call will automatically be routed to your local one-call center.
Utility companies that have potential facilities in the area of your installation site will be notified of your intent to dig. Each affected utility company will send a locator to mark the approximate location of your underground utility lines. This service is free and typically occurs within 2-3 working days.
For safety and to avoid damaging underground utilities, it is recommended that you install ground screws at least 18 inches from either side of marked utility lines.
Ground screws require low-speed, high-torque drivers for proper installation. Equipment options include:
- Handheld electric or hydraulic installation units
- Hydraulic attachments for skid steers
- Hydraulic attachments for mini skid steers
- Hydraulic attachments for excavators
DIY-friendly: Many homeowners and contractors successfully install ground screws themselves by renting installation equipment from AGS or our authorized distributors. However, engineered projects require proper equipment and technique to ensure correct depth, alignment, and performance that meets structural requirements.
In many cases, yes, a permit is required for any permanent structure, regardless of whether it's supported by concrete or ground screws. Permit requirements vary by jurisdiction, project type, and load conditions.
AGS ground screws are evaluated under ICC-ESR-4226, which helps streamline the approval process with many building officials by providing the technical documentation they need. In some smaller or non-structural applications, permits may not be required, but it's always best to confirm with your local building department before beginning your project.
Installation time varies based on several factors:
- Ground screw diameter and length – Larger, longer screws take more time to install
- Soil type – Soft soils install faster than dense clay or rocky conditions
- Installation equipment – Hydraulic attachments on machinery are faster than handheld units
- Site accessibility – Easy access allows for faster installation
- Installer experience – Experienced installers work more efficiently
In typical conditions, individual ground screws can be installed in just a few minutes each. A complete foundation for a deck or small structure can often be installed in a single day, compared to several days required for concrete footings to be poured and cured.
Where Exceptional Materials Meet Real Expertise
We don’t just stock products; we curate and manufacture them. Every item in our collection is hand-picked from the world’s finest manufacturers, rigorously tested in real builds, and backed by a small, obsessive team that knows each product inside out. We deliver boutique quality, tailored solutions, and zero-compromise performance—for discerning builders, architects, and homeowners who refuse to settle.
Better Materials, Smarter Service
American Ground Screws
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