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Pilot-Holes
CLEARANCE HOLE DIAMETERS AND
HARD SOIL PILOT HOLE DIAMETERS
FOR DUCKBILL® EARTH ANCHORS
INSTALLATION OF DUCKBILL ANCHORS IN HARD SOILS CAN BE GREATLY HELPED BY THE USE OF A PILOT HOLE. TYPICALLY, THE
PILOT HOLE HAS NO SIGNIFICANT AFFECT ON THE HOLDING POWER OF THE ANCHOR. THERE ARE MANY ACCEPTABLE METHODS OF DRILLING
PILOT HOLES AND MANY MANUFACTURES OF EQUIPMENT TO DO SO. RECOMMENDED HARD SOIL PILOT HOLE DIAMETERS AND CLEARANCE
HOLE DIAMTERS ARE CHARTED BELOW.
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MODEL
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CLEARANCE HOLE DIAMETER
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MINIMUM PILOT HOLE
DIAMETER FOR
HARD SOIL
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40-DB
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1.0"
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0.75"
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68-DB
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1.50"
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1.25"
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88-DB
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2.25"
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2.00"
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138-DB
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2.75"
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2.50"
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