Round shaft helical anchors are deep foundation systems that transfer loads to stable soil strata through a screw-like configuration. The system features a central steel shaft with one or more welded helical plates, installed by applying torque to rotate the anchor into the ground. These anchors serve both tension and compression applications across new construction and foundation repair projects.
The helical plates act as screws during installation, penetrating soil while hydraulic equipment monitors torque to verify load capacity in real-time. This process continues until the anchor reaches competent bearing strata, providing immediate load transfer with minimal vibration or excavation. The design delivers enhanced lateral stability and resistance to deflection compared to alternative foundation systems.
Material specifications typically include high-strength steel shafts (API 5CT N80 or ASTM A500 Grade B/C) with helical plates fabricated from ASTM A572 or A36 hot-rolled plate. Hot-dip galvanizing per ASTM A123 or A153 standards provides corrosion protection. Technical capacities range from shaft diameters of 1-1/2 to 12-3/4 inches, supporting loads up to 800,000 pounds in compression and tension, with ultimate torsional strengths from 4,500 to 180,000 foot-pounds.
Applications include utility pole foundations, communication towers, retaining walls, slope stabilization, and residential or commercial foundation repairs. The system accommodates challenging soil conditions from soft to moderately hard soils, with installation possible year-round using compact equipment to reduce site disruption and mobilization costs.
Leading Wholesaler of Durable Round Shaft Helical Anchors
RaxPower is proud to be a leading manufacturer of helical anchors, with our Round Shaft Helical Anchor featuring innovative systems designed to install faster, perform stronger, and last longer.
With over 21 years of experience in helical manufacturing, we leverage advanced hot forging technology for superior strength and precise sizing, ensuring each anchor delivers reliable performance in compression applications.
Our state-of-the-art production facilities in Hebei Province, covering 17,000 square meters, provide the capacity to support projects of any scale, while strict quality control—including hot-dip galvanization per ISO 1461 for corrosion resistance and rigorous load testing—guarantees durability.
Contractors nationwide praise our products for their ease of installation, minimal vibration, and immediate load transfer, making them ideal for foundation repair, new construction, and challenging soil conditions.
At RaxPower, your success is our mission, and we are committed to customer-centric innovation, collaborating closely with engineers to tailor solutions. Join our network of satisfied partners; contact us today to discuss your project or become a RaxPower distributor.
| Shaft OD (in) | Wall Thickness (in) | Shaft Material | Shaft Coupling | Coupling Materials | Helix Material | Corrosion Protection | Ultimate Tension Strength (lbs) | Compression Load Limit (lbs) | Ultimate Torsional Strength (ft-lbs) | Uplift/Compression Capacity (lbs) | Installation Torque Factor (Kt) (ft⁻¹) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.375 | 0.190 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 125,000 | 100,000 | 6,500 | 65,000 | 10 |
| 2.375 | 0.254 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 125,000 | 135,000 | 9,000 | 90,000 | 10 |
| 2.875 | 0.217 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 180,000 | 140,000 | 13,000 | 117,000 | 9 |
| 2.875 | 0.276 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 180,000 | 180,000 | 16,000 | 144,000 | 9 |
| 3.500 | 0.254 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 250,000 | 210,000 | 18,000 | 144,000 | 8 |
| 3.500 | 0.368 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 250,000 | 290,000 | 27,000 | 216,000 | 8 |
| 4.500 | 0.250 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 275,000 | 260,000 | 30,000 | 195,000 | 6.5 |
| 4.500 | 0.337 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 360,000 | 350,000 | 48,000 | 312,000 | 6.5 |
| 5.000 | 0.362 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 413,000 | 413,000 | 74,000 | 413,000 | 6 |
| 5.500 | 0.361 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 510,000 | 466,000 | 90,700 | 466,000 | 5.5 |
| 7.000 | 0.498 | API 5CT N80 | Inertia Welded | AISI 4140/4125 | ASTM A572 | Hot-Dip Galvanized (ASTM A123/A153) | 999,000 | 814,000 | 180,000 | 810,000 | 4.5 |
Frequently Asked Questions
What are the typical applications for round shaft helical anchors?
Round shaft helical anchors from RaxPower are ideal for both tensile and compressive loads in various foundation environments. They are commonly used in new construction, foundation repair, utility poles, signs, wall retention, and sites affected by harsh soil conditions, providing cost-effective support while reducing soil movement and increasing bearing capacity.
What shaft sizes and load capacities do you offer?
RaxPower offers round shaft helical anchors in outer diameters from 2 3/8
How is the installation torque related to load capacity?
Installation torque is directly related to load capacity through the capacity-to-torque ratio (Kt). The ultimate axial capacity is determined by the equation Pu = Kt * T, where T is installation torque. Kt values vary based on shaft size and soil conditions, typically ranging from 4.5 to 10 ft⁻¹ for different diameters. Torque is monitored during installation to ensure the desired capacity is achieved.
What corrosion protection is provided for the anchors?
All RaxPower round shaft helical anchors are protected with hot-dip galvanizing per ASTM A153 or A123 standards, providing excellent corrosion resistance with coating thicknesses typically between 70μm to 120μm, ensuring long-term durability in various soil conditions.
What is the warranty on your helical anchors?
RaxPower provides a 2-year warranty on all our round shaft helical anchor products, covering defects in materials and workmanship.
Do you provide third-party certification or test reports?
Yes, RaxPower provides type test reports and third-party certifications upon request, including compliance with IEC, IEEE, and national grid standards. Our products undergo rigorous testing, such as load tests and gauge tests per IEC 120, and have passed SGS evaluations to ensure they meet industry requirements for reliability and safety.
Can you customize helical anchors to fit our specific project or OEM needs?
Yes, RaxPower offers comprehensive customization of shaft diameters, wall thicknesses, helix configurations, bracket types, and accessories based on your project requirements. We provide OEM/ODM services including material selection, structural optimization, and surface treatments, backed by strict quality control and multi-stage testing to ensure consistent quality.
What is your lead time for bulk orders, and do you offer expedited shipping?
Lead times depend on order volume and part complexity, but we prioritize efficient production with options for rush orders. For large projects, we leverage our 17,000 sqm production facility and streamlined processes to ensure on-time delivery, with expedited shipping available to keep your schedule on track.
Do you provide samples or accept small quantity orders for product evaluation?
Absolutely. RaxPower offers samples and accepts small quantity orders with a minimum order quantity of 1 piece, allowing you to evaluate product quality, dimensional accuracy, and performance before committing to larger purchases.
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