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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
7.2 Model HA175 Helical Anchor System
7.2.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 1.75-
inch, solid, round-corner square (RCS) hot-rolled steel bars conforming to ASTM A29
with a minimum yield strength of 90 ksi and a minimum tensile strength of 115 ksi. The
shaft finish is either plain steel or hot-dip galvanized in accordance with ASTM A123.
7.2.2 Shaft Coupling Material: The extension shaft sections have an internally forged upset
socket coupling at one end. Since the socket coupling is internally forged from the parent
shaft material, the material properties of the coupling are similar to the central steel
shaft. The shaft coupling finish is either plain steel or hot-dip galvanized in accordance
with ASTM A123.
7.2.3 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.
7.2.4 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 hex jam nuts.
The bolts and nuts are mechanically galvanized in accordance with ASTM B695.
7.2.5 Brackets: New construction bracket HA175NCB and thread rod adaptor HA175TRA
are suitable for tension applications with the HA175 shaft. Bracket finishes are either
plain steel or hot-dip galvanized in accordance with ASTM A123. Bracket shaft coupling
hardware finishes are mechanically galvanized in accordance with ASTM B695.
7.3 Model HP237 Helical Pile/Anchor System
7.3.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 2.375-
inch outer diameter by 0.154-inch nominal wall thickness, 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.
7.3.2 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.
7.3.3 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.