HD12 Holdown

*For further description please see Simpson Strong-Tie Wood Construction Connectors Catalog.

**Click Load Table icon for size & fastening requirements.

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HDB/HD Holdowns

Simpson Strong-Tie offers a wide range of bolted holdowns offering low-deflection performance for a range of load requirements. All of these holdowns have been tested in accordance with ICC-ES's AC 155 acceptance criteria and are approved for use in vertical and horizontal applications.

The NEW HD3B is light-duty holdown designed for use in shearwalls and braced-wall panels, as well as other lateral applications.

The NEW HD5B, HD7B and HD9B bolted holdowns incorporate the proven design of our HDQ8 SDS-style holdown and feature a unique seat design which greatly minimizes deflection under load. HDB holdowns are self jigging, ensuring that the code-required minimum of seven bolt diameters from the end of the post is met. They can be installed directly on the sill plate or raised above it and are suitable for back-to-back applications where eccentricity is a concern. HDBs are designed to provide loads for intermediate-load-range shearwalls, braced-wall panels and lateral applications.

HDBs available April 2011.

HD holdowns offer the highest allowable loads, providing high capacity for both vertical and horizontal applications. The HD12 and HD19 are self jigging, ensuring that the code-required minimum of seven bolt diameters from the end of the post is met. They can be installed back-to-back when eccentricity is an issue.

Material: See table

Finish: HD3B/HD5B/HD7B/HD9B – Galvanized; some models available in HDG

HD – Simpson Strong-Tie® gray paint

Installation:

•Use all specified fasteners. See General Notes.

•Bolt holes shall be a minimum of 1/32" to a maximum of 1/16" larger than the bolt diameter (per NDS, section 11.1.2).

•Stud bolts should be snugly tightened with standard cut washers between the wood and nut (BP's are required in the City and County of Los Angeles).

•The Designer must specify anchor bolt type, length, and embedment. See SB and SSTB Anchor bolts.

• To tie multiple 2x members together, the Designer must determine the fasteners required to join members to act as one unit without splitting the wood

•Refer to Anchor Designer Software™ for ACI 318 for anchoring solutions.

For holdowns, per ASTM test standards, anchor bolt nut should be finger-tight plus 1/3" to 1/2" turn with a hand wrench, with consideration given to possible future wood shrinkage. Care should be taken to not over-torque the nut. Impact wrenches should not be used.