Simpson Strong-Tie HD Holdown
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Simpson Strong-Tie HD Holdown
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
Finish
- Simpson Strong-Tie gray paint; HDG available
These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.
To achieve published loads, machine bolts shall be installed with the nut on the opposite side of the holdown. If this orientation is reversed, the Designer shall reduce the allowable loads shown per NDS requirements when bolt threads are in the shear plane.
All references to bolts are for structural quality through bolts (not lag screw or carriage bolts) equal to or better than ASTM A307, Grade A.
HD19 with 1 1/4" anchor rod requires No.1 post (or better) to achieve published loads.