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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
6
HELICAL SOIL NAIL MATERIALS
6.1 Model HS150 Helical Soil Nail System
6.1.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 1.50-
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.
6.1.2 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.
6.1.3 Helix Plate Material: The helix plates are factory welded to the lead or extension
shaft sections. The helix plates have outer diameters of either 6 or 8 inches and are
manufactured from 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. 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 one
(1) bolt and nut per coupled shaft section. The coupling hardware consists of 0.750-inch
standard hex bolts conforming to SAE J429 Grade 8 and jam nuts. The bolts and nuts
are mechanically galvanized in accordance with ASTM B695.
6.1.5 Thread Rod Adapter: Thread rod adaptor HA150TRA is suitable for use with the
HS150 shaft. Thread rod adapter finishes are either plain steel or hot-dip galvanized
in accordance with ASTM A123. Adapter shaft coupling hardware is mechanically
galvanized in accordance with ASTM B695.
6.2 Model HS175 Helical Soil Nail System
6.2.1 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.
6.2.2 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.
6.2.3 Helix Plate Material: The helix plates are factory welded to the lead or extension
shaft sections. The helix plates have outer diameters of either 6 or 8 inches and are
manufactured from 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. The helix plate finish is either
plain steel or hot-dip galvanized in accordance with ASTM A123.
