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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
6.4.2 Shaft Coupling Material: The shaft coupling material consists of 3.750-inch outer
diameter by 0.500-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.
6.4.3 Helix Plate Material: The helix plates are factory welded to the lead or extension shaft
sections. Helix plates with outer diameters of 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.
6.4.4 Shaft Coupling Hardware: The lead and extension shaft sections are coupled with four
(4) bolts and nuts per coupled shaft section. The coupling hardware consists of 1.125-
inch standard hex bolts conforming to SAE J429 Grade 5 and standard hex jam nuts.
The bolts and nuts are zinc coated in accordance with ASTM B633.
6.4.5 Brackets: New construction bracket HP450NCB8 shall be used for tension and
compression applications and HP450NCBE8 shall be used for compression only
applications with the HP450 shaft. 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.
6.5 Model HP662 Helical Pile System
6.5.1 This section is for general information purposes only. Larger diameter product lines,
such as Model HP662, are typically customized on a project specific basis.
6.5.1.1 Central Steel Shaft: The central steel shaft of the lead and extension sections
are 6.625-inch outer diameter by 0.280-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.
6.5.1.2 Shaft Coupling Material: The shaft coupling material consists of 6.000-inch
outer diameter by 0.375-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.
6.5.1.3 Helix Plate Material: The helix plates are factory welded to the lead or extension
shaft sections. Helix plates with outer diameters of 10, 12 or 14 inches are
either 0.375 or 0.500-inch thick; 16-inch diameter helices are 0.500-inch thick.
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.
