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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
6.1.2 Shaft Coupling Material: The shaft coupling material is factory welded to the extension
shaft and consists of 2.750-inch outer diameter by 0.156-inch nominal wall thickness,
hollow structural section in conformance with ASTM A513 Type 5, Grade 1026 with a
minimum yield strength of 70 ksi and a minimum tensile strength of 80 ksi. The shaft
coupling finish is either plain steel or hot-dip galvanized in accordance with ASTM A123.
6.1.3 Helix Plate Material: The helix plates are factory welded to the lead or extension shaft
sections and consist of either 0.313 or 0.375-inch thick ASTM A572 Grade 50 steel with
a minimum yield strength of 50 ksi and a minimum tensile strength of 65 ksi. Helix plate
outer diameters are 6, 8, 10, 12 or 14 inches. The helix plate finish is either plain steel or
hot-dip galvanized in accordance with ASTM A123.
6.1.4 Shaft Coupling Hardware: The lead and extension shaft sections are coupled with two
(2) bolts and nuts per coupled shaft section. The coupling hardware consists of 0.625-
inch standard hex bolts conforming to ASTM A325 and heavy hex jam nuts. The bolts
and nuts are hot-dip galvanized in accordance with ASTM A153.
6.1.5 Brackets: New construction bracket HP238NCB and retrofit brackets HP238B2 and
HP238BML are designed for use with the HP237 shaft. Bracket finishes are either plain
steel or hot-dip galvanized in accordance with ASTM A123. Bracket hardware finishes
for the new construction brackets are hot-dip galvanized in accordance with ASTM
A153. Bracket hardware finishes for the retrofit brackets are zinc coated in accordance
with ASTM B633.
6.2 Model HP287 and Model HP288 Helical Pile Systems
6.2.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 2.875-
inch outer diameter by 0.203-inch nominal wall thickness (HP287) or 0.276-inch nominal
wall thickness (HP288), hollow structural section in conformance with ASTM A500
Grade B or C with a minimum yield strength of 60 ksi and a minimum tensile strength
of 70 ksi. The shaft finish is either plain steel or hot-dip galvanized in accordance with
ASTM A123.
6.2.2 Shaft Coupling Material: The shaft coupling material is factory welded to the extension
shaft and consists of 3.500-inch outer diameter by 0.281-inch nominal wall thickness,
hollow structural section in conformance with ASTM A513 Type 5, Grade 1026 with a
minimum yield strength of 70 ksi and a minimum tensile strength of 80 ksi. The shaft
coupling finish is either plain steel or hot-dip galvanized in accordance with ASTM A123.
6.2.3 Helix Plate Material: The helix plates are factory welded to the lead or extension shaft
sections. Helix plates with outer diameters of 6, 8, 10, 12 or 14 inches are either 0.375 or
0.500-inch thick and 16-inch diameter helix plates are 0.500-inch thick. The helix plates
are manufactured with ASTM A572 Grade 50 steel with a minimum yield strength of 50
ksi and a minimum tensile strength of 65 ksi. The helix plate finish is either plain steel or
hot-dip galvanized in accordance with ASTM A123.
6.2.4 Shaft Coupling Hardware: The lead and extension shaft sections are coupled with two
(2) bolts and nuts per coupled shaft section. The coupling hardware consists of 0.750-
inch standard hex bolts conforming to SAE J429 Grade 8 and standard jam nuts. The
bolts and nuts are zinc coated in accordance with ASTM B633.
