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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
6.2.5 Brackets: New construction brackets HP288NCB or HP288NCB8 shall be used for
tension and compression applications and HP288NCBE or HP288NCBE8 shall be used
for compression only applications with the HP287 or HP288 shafts. Retrofit brackets
FS288B, FS288BL, HP288B2, and HP288BML are designed for use 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.
6.3 Model HP350 Helical Pile System
6.3.1 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.
6.3.2 Shaft Coupling Material: The shaft coupling material consists of 4.250-inch outer
diameter by 0.344-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.
6.3.3 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.
6.3.4 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 1.000-
inch standard hex bolts conforming to SAE J429 Grade 8 and standard hex jam nuts.
The bolts and nuts are zinc coated in accordance with ASTM B633.
6.3.5 Brackets: New construction brackets HP350NCB or HP350NCB8 shall be used for
tension and compression applications and HP350NCBE or HP350NCBE8 shall be used
for compression only applications with the HP350 shaft. Retrofit brackets HP350B and
HP350BS are designed to use with the HP350 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.
6.4 Model HP450 Helical Pile System
6.4.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 4.500-
inch outer diameter by 0.337-inch nominal wall thickness, hollow structural section in
conformance with ASTM A500 Grade B or C with a minimum yield strength of 50 ksi
and a minimum tensile strength of 60 ksi. The shaft finish is either plain steel or hot-dip
galvanized in accordance with ASTM A123.
