Soil Description

Blow Count (N)

HULK
H50

HULK
H80

HULK
H110

HULK HG100

HULK HG180

HULK
HG320

Ultimate anchor strength

N/A

45kN

45kN

45kN

280kN

280kN

280kN

Very dense / cemented sands; Coarse gravel and cobbles

60+

45kN
(1,3)

45kN
(1,3)

45kN
(1,3)

140-280kN
(1,3)

N/A
(5)

N/A
(5)

Dense fine compacted sands; Very hard silts or clays

45-60

27-45kN
(2,3,4)

45kN
(2,3)

45kN
(2,3)

105-140kN
(2,4)

170-280kN
(1,3,4)

201-280kN
(1,3)

Dense clays, sands and gravels; Hard silts and clays

35-50

18-27kN
(4)

24-36kN
(4)

45kN
(2,3)

75-100kN
(2,4)

113-170kN
(2,4)

160-201kN
(2,3,4)

Medium dense sandy gravel; Stiff to hard silts and clays

24-40

13-18kN
(4)

18-22kN
(4)

23-30kN
(4)

60-90kN
(4)

85-95kN
(2,4)

121-170kN
(2,4)

Mediums dense coarse sand and sandy gravel; Stiff to very stiff silts and clays

14-25

9-13kN
(4)

14-18kN
(4)

18-23kN
(4)

45-60kN
(4)

40-95kN
(4)

90-121kN
(4)

Loose to medium dense fine to coarse sand; Firm to stiff clays and silts

7-14

7-11kN
(4)

9-16kN
(4)

13-20kN
(4)

35-50kN
(4)

47-71kN
(4)

70-90kN
(4)

Loose fine sand; Alluvium; Soft clays; Fine saturated silty sand

4-8

4-7kN
(4,6)

6-10kN
(4,6)

8-13kN
(4,6)

25-40kN
(4,6)

38-56kN
(4,6)

45-70kN
(4,6)

1. Drilled pilot hole required for efficient installation.
2. Ease of installation may be improved by drilling a pilot hole.
3. Holding capacity limited by ultimate strength of anchors.
4. Holding capacity limited by soil structure.
5. Not recommended in these soils.
6. Wide variation in soil properties reduces prediction accuracy. Pre-construction field test is recommended.