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HD Holdown

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The HD is designed to create high allowable loads for both vertical and horizontal applications in wood construction. This holdown is installed with bolts into posts or columns. The HD can be installed back to back when eccentricity is an issue.

Key Features

  • High-capacity low-deflection holdown
  • Self-jigging, ensuring the code-required minimum of seven bolt diameters from the end of the post when installed flush with the sill plate
  • May be raised and installed off the sill plate


  • See table


  • Simpson Strong-Tie gray paint; HDG available


  • See General Notes for Holdowns and Tension Ties
  • Bolt holes shall be a minimum of 1/32″ to a maximum of 1/16″ larger than the bolt diameter (per 2015/2018 NDS, section
  • Stud bolts should be snugly tightened with standard-cut washers between the wood and nut (BPs are required in the City and County of Los Angeles)
  • Standard-cut washer is required under the anchor nut for HD12 with 1″ anchor and HD19 with 1 1/8″ anchors
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