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HTT Heavy Tension Tie


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Holdowns and Tension Ties

This product's information may differ depending on the category of use. You are currently viewing details related to Holdowns and Tension Ties. You can also view product information related to the category: Tension Ties

The HTT is designed to resist medium tension loads that are fastened with #10 screws. This single-piece formed heavy tension tie has a four-ply formed seat, is designed without rivets and does not require washers. This tension tie provides high-strength, post-pour, concrete-to-steel connections.

Key Features

  • Ideal for retrofit or new construction projects
  • Can be installed with cast-in-place or post-installed anchor bolts
  • Four-ply formed steel provides increased tension capacity
  • Anchor bolt washers not required


  • See table


  • Galvanized. May be ordered HDG; contact Simpson Strong-Tie.


  • Use all specified fasteners.
  • Use the specified number and type of screws to attach the strap portion to the steel stud. Bolt the base to the wall or foundation with a suitable anchor; see table for the required bolt diameter.
  • See SB and SSTB anchor bolts for anchorage options.
  • See SET-3G™ and AT-XP® adhesive products for anchor bolt retrofit options.

Related Literature

Load Tables

  These products are available with additional corrosion protection.

  1. The designer shall specify the foundation anchor material type, embedment and configuration.
  2. Stud design by specifier. Tabulated loads are based on a minimum stud thickness for fastener connection.
  3. 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. See S/HDU holdown for installation detail.
  4. 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 tension tie to have a nominal strength to resist the lesser of the amplified seismic load or the maximum force the system can deliver.
  5. It is acceptable to use the capacity listed for the thickest single member or back-to-back members for thicker stud members in the same configuration. Stud design by specifier.
  6. See Fastening Systems for more information on Simpson Strong-Tie fasteners.

Code Reports & Compliance