Helical Pile Torque-to-Capacity

Ultimate axial capacity from torque × Kt and allowable from factor of safety. Engineer of record governs.

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Formula and source

Ultimate axial capacity = Kt × installation_torque (lb-ft). Allowable = ultimate / factor_of_safety. Kt by shaft type (engineering-practice values): 1.5 in solid 10, 1.75 in solid 9, 2.875 in pipe 7, 3.5 in pipe 5.

ICC-ES Acceptance Criteria AC358 (helical foundation systems) by name; manufacturer technical bulletins (CHANCE, Magnum, Ram Jack, AB Chance) by name.

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