The S/HD series of holdowns is designed for installation with either screws or bolts into the studs or column. The S/HDS series installs with #14 screws and has been designed to utilize fewer fasteners to reduce installation time. The S/HDB series is ideal for bolt-on applications where the cold-formed stud manufacturer can prepunch the bolt holes.
Simpson Strong‑Tie® gray paint. Hot-dip galvanized available; see Corrosion Information.
Use all specified fasteners; some models have extra fastener holes. See General Notes.
Anchor bolt washer is not required.
Standard washers are required on stud bolt nuts for model S/HDB.
Thin wall socket (OD = 2" maximum) is required for S/HD15 to tighten the 1" anchor bolt.
Stud bolts — use A307.
Boundary members (back-to-back studs) design shall be by Designer.
S/HDS and S/HDB holdowns can be welded per Designer’s recommendation and specification. To tie back-to-back stud members together, the Designer must determine the fasteners required to bind members to act as one unit. Welders and welding procedures shall be qualified as specified in AWS D1.3. Welded connections used for cold-formed steel structural members in which the thickness of the thinnest connected part is 0.18 inch or less shall comply to AISI S100 Specification Section E2.
See SB, SSTB and PAB anchor bolts for anchorage options.
See SET-XP® and AT-XP® adhesive products for anchor bolt retrofit options.
The Designer shall specify the foundation anchor material type, embedment and configuration. Some of the tabulated holdown tension loads exceed the tension strength of typical ASTM A36 or A307 anchor bolts.
Stud design by Specifier. Tabulated loads are based on a minimum stud thickness for fastener connection.
1/4" self-drilling screws may be substituted for #14 self-tapping screws.
Deflection at ASD or LRFD includes fastener slip, holdown deformation and anchor rod elongation for holdowns installed up to 4" above top of concrete. Holdowns may be installed raised, up to 18" above top of concrete, with no load reduction provided that additional elongation of the anchor rod is accounted for.
The Nominal Tension Load is based on the tested average ultimate (peak) load and is provided for design in accordance with section C5 of AISI S213 that requires a holdown to have a nominal strength to resist the lesser of the amplified seismic load or the maximum force the system can deliver.
Not all fastener holes for S/HDS holdowns need to be filled, as additional fastener holes provided. Install fasteners symmetrically.