Model 450 Helical Foundation System

Technical Specifications

Shaft Material: 4.50” OD x 0.337” Wall

ASTM A500 Grade B or C, Yield Strength = 50 ksi (min.)

Helix Blades: ASTM A572 Grade 50 x 3/8” Thick

Helix blade geometry in accordance with ICC‐ES AC358

Coupler Material: 3.75” x 0.500” Wall ASTM A513 Type 5, Yield Strength = 70 ksi (min.) Coupling Hardware: Four (4) 1‐1/8” Grade 8 Bolts with Nuts Finish: Available plain or with hot-dipped galvanized coating in accordance with ASTM A123

New Construction Helical Pile Capacities

Mechanical Axial Shaft Capacities:

Allowable Compression = 109.9 kips*

Allowable Tension = 54.7 kips*

*Capacity based on black, uncoated steel with a loss in steel thickness due to corrosion over a period of 50 years. The design period and corrosion loss rates are in accordance with ICC‐ES AC358. Mechanical compression limits are based on continuous lateral soil confinement. Piles with exposed unbraced lengths should be evaluated on a case by case basis by the project engineer.

Torque Limited Axial Design Capacities based on
Practical Torsional Resistance of Pile Shaft = 22,000 ft-lbs:

Ultimate Soil Capacity = 132 kips (with K=6 ft‐1)

Allowable Soil Capacity = 66 kips (FOS=2.0)