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"Pro Post Foundation Screw Piles" Physical Characteristics
Outside Diameter of Anchor	Wall Thickness of Anchor	Diameter of Helix Blade	Thickness of Helix Blade
48 mm	3.7 mm	200 mm	8 mm
48 mm	3.7 mm	250 mm	8 mm
60 mm	3.9 mm	200 mm	8 mm, 9.5 mm or 12.7 mm
		250 mm
		300 mm
		350 mm
		400 mm
		450 mm
		500 mm
		600 mm
73 mm	4.8 mm	250 mm	8 mm, 9.5 mm or 12.7 mm
		300 mm
		350 mm
		400 mm
		450 mm
		500 mm
		600 mm
		750 mm
89 mm	5.5 mm	250 mm	8 mm, 9.5 mm or 12.7 mm
		300 mm
		350 mm
		400 mm
		450 mm
		500 mm
		600 mm
		750 mm
		900 mm
101 mm	5.7 mm	300 mm	8 mm, 9.5 mm or 12.7 mm
		350 mm
		400 mm
		450 mm
		500 mm
		600 mm
		750 mm
		900 mm
114 mm	6.0 mm	300 mm	8 mm, 9.5 mm or 12.7 mm
		350 mm
		400 mm
		450 mm
		500 mm
		600 mm
		750 mm
		900 mm
141 mm	6.6 mm	350 mm	9.5 mm or 12.7 mm
		400 mm
		450 mm
		500 mm
		600 mm
		750 mm
		900 mm
168 mm	7.1 mm	350 mm	9.5 mm or 12.7 mm
		400 mm
		450 mm
		500 mm
		600 mm
		750 mm
		900 mm

Allowable Compressive and Tensile Loads^{Footnote (1)} for the Proposed Auger-Installed Pile in Granular Soil^{Footnote (2)} or Silt^{Footnote (3)}
Applied Torque		Allowable Load^{Footnote (4)}
Applied Torque		Compression		Tension
N∙m	(lbf)	kN	(lb)	kN	(lb)
678	500	16	3 600	10	2 250
1 017	750	22	4 950	15	3 375
1 356	1 000	28	6 300	20	4 500
1 695	1 250	34	7 650	25	5 625
2 034	1 500	40	9 000	30	6 750
2 373	1 750	46	10 350	35	7 875
2 712	2 000	52	11 700	38	8 550
3 051	2 250	58	13 050	40	9 000
3 390	2 500	64	14 400	42	9 450

Notes:

Footnote 1

These allowable loads are only valid when the product is installed in granular soil or silt. Special attention is required when the auger-installed steel piles are installed in a recently backfilled site, where the granular material exceeds 200 mm in diameter or in cohesive soils. In these cases, Table 4.1 does not apply and the allowable loads need to be determined by on-site confirmatory testing.

Return to footnote 1 referrer

Footnote 2

Granular soils (coarse-grained soil) are non-cohesive soils (e.g., sand, gravel or silt with little or no clay content and little to no cohesive strength).

Return to footnote 2 referrer

Footnote 3

Silt is that portion of soil material passing through a No. 200 (75-µm) U.S. standard sieve that is non-plastic or very slightly plastic and exhibits little or no strength when air-dried.

Return to footnote 3 referrer

Footnote 4

The load values in this table include a minimum safety factor of 2.0.

Return to footnote 4 referrer

Allowable Compressive and Tensile Loads for the Proposed Auger-Installed Pile in Cohesive Soil^{Footnote (1)}
Applied Torque		Allowable Load^{Footnote (2)}
Applied Torque		Compression^{Footnote (3)}		Tension^{Footnote (4)}
N∙m	(lbf)	kN	(lb)	kN	(lb)
678	500	9	2 025	3	675
1 017	750	15	3 375	8	1 800
1 356	1 000	21	4 725	12	2 700
1 695	1 250	27	6 075	16	3 600
2 034	1 500	32	7 200	20	4 500
2 373	1 750	38	8 550	25	5 625
2 712	2 000	44	9 900	29	6 525
3 051	2 250	50	11 250	33	7 425
3 390	2 500	55	12 375	37	8 325

Notes:

Footnote 1

These allowable loads are valid only when the pile is installed in a cohesive (clay) soil. Always check the nature of the soils in place before using this table.

Return to footnote 1 referrer

Footnote 2

If the granular material exceeds 200 mm in diameter, the permissible load capacity listed above will be an overestimate. Table 4.2 does not apply in such a case and the allowable loads need to be determined by on-site confirmatory testing.

Return to footnote 2 referrer

Footnote 3

The load values in this table include a minimum safety factor of 2.0.

Return to footnote 3 referrer

Footnote 4

The tightening torque corresponds to the torque measured on the manometer when screwing the last centimeters of the pile.

Return to footnote 4 referrer

Footnote 5

The tightening torque corresponds to the average measured on the gauge when screwing the last 50 cm of the pile.

Return to footnote 5 referrer

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