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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
7.3.4 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.
7.3.5 Brackets: New construction bracket HP238NCB shall be used for both tension and
compression applications with the HP237 shaft. Bracket finishes are either plain steel
or hot-dip galvanized in accordance with ASTM A123. Bracket hardware finishes are
hot-dip galvanized in accordance with ASTM A153.
7.4 Model HP287 and Model HP288 Helical Pile/Anchor Systems
7.4.1 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.
7.4.2 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.
7.4.3 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.
7.4.4 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.
7.4.5 Brackets: New construction brackets HP288NCB or HP288NCB8 shall be used for both
tension and compression applications with the HP287 or HP288 shafts. Bracket finishes
are either plain steel or hot-dip galvanized in accordance with ASTM A123. Bracket
hardware finishes are zinc coated in accordance with ASTM B633.
7.5 Model HP350 Helical Pile/Anchor System
7.5.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 3.500-
inch outer diameter by 0.313-inch nominal wall thickness, hollow structural section that
is fabricated from ASTM A572 sheet, rolled to tube form. Wall thickness tolerances
conform to ASTM A513. The shaft material shall have a minimum yield strength of 65 ksi
and a minimum tensile strength of 75 ksi. The shaft finish is either plain steel or hot-dip
galvanized in accordance with ASTM A123.
