Holding Capacities>>>


Soil Description
Blow
Count (N)
SR-3
Ultimate:
100 kips
SR-2
Ultimate:
100 kips
SR-1
Ultimate:
100 kips
Very Dense/Cemented Sands, Coarse Gravel & Cobbles 45-60 n/a
(5)
66-81 (1,3) 58-65 (1)
Dense clays, sands and gravels,
hard silts and clays
35-50 81
(2,3)
62-81 (2,3) 39-58 (2)
Medium dense sandy gravel,
stiff to hard silts and clays
24-40 63-81 (2,3) 46-66 (2,3) 29-41
Medium dense coarse sand and sandy gravel,
stiff to very stiff silts and clays
14-25 48-63 31-48 24-32
Loose to medium dense fine to coarse sand,
firm to stiff clays and silts
7-14 37-48 (4) 27-36 (4) 16-24 (4)
Loose fine sand, alluvium, soft clays, fine saturated silty sand 4-8 24-37 (4) 19-28 (4) 13-19 (4)

1. Drilled pilot hole required to install.
2. Ease of installation may be improved by drilling a pilot hole.
3. Holding capacity limited by ultimate strength (120 kips) of anchors. Maximum working load should not exceed 90% of yield strength (80 kips).
4. Holding capacity limited by soil structure. Wide variation in soil properties reduces prediction accuracy. Pre-construction field test is highly recommended.
5. Not recommended in these soils.

Holding capacity in Kips and kN after anchor locking with no significant movement. Actual capacity must be tested with anchor load locker. Use this chart for estimation only.