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HDQ Holdown, Quick-Install

HDQ

On This Page

The HDQ is designed for high loads and provides ease of installation. The unique design of the seat in this holdown allows installation raised above the sill plate and greatly minimizes deflection under load. The HDQ comes with Strong-Drive® SDS Heavy-Duty Connector screws, which install easily, reduce fastener slip and provide a greater net section than bolts.

Key Features

  • Strong-Drive SDS Heavy-Duty Connector screws are supplied with the holdowns to ensure proper fasteners are used
  • Screws may be installed either flush or raised off the mudsill without a reduction in load value
  • No stud bolts to countersink at openings

Material

  • 7 ga.

Finish

  • Galvanized

Installation

  • See General Notes for Holdowns and Tension Ties
  • No additional washer is required
  • Strong-Drive SDS Heavy-Duty Connector screws install best with a low-speed, high-torque drill equipped with a 3/8" hex-head driver
  • 5/8" of adjustability perpendicular to the wall

Related Literature

Wood Construction Connectors 2021-2023
C-C-2021
A catalog including new product information as well as any applicable specification and installation instructions for wood-to-wood and wood-to-concrete structural connectors.
Catalog
Conectores para la construcción con madera 2021–2023
C-C-2021SP
El catálogo incluye información sobre nuevos productos, así como especificaciones e instrucciones de instalación aplicables para conectores estructurales de madera a madera y de madera a concreto.
Catalog
High Wind Guide
F-C-HWG20
A comprehensive guide to help Designers select the most appropriate connections for challenging, high-wind regions.
Product Guide
Connectors Installed on SCL Columns
T-C-SCLCLM21
A technical bulletin discussing the structural properties of the two different surface sides of SCL columns.
Technical Bulletin
Connectors Installed on SCL Columns
T-C-SCLCLMCAN20
A Canadian Limit States technical bulletin addressing typical installations of Simpson Strong-Tie® connectors on SCL columns as well as reduction factors for narrow-face SCL installations.
Technical Bulletin
Simpson Strong-Tie® Stainless-Steel Holdowns
L-C-SSHD20
The Simpson Strong-Tie bolted holdown (HDSS) and screw holdown (DTTSS & HHDQSS) are manufactured from Type 316L stainless steel, which provides superior durability in a highly corrosive environment.
Engineering Letter
Simpson Strong-Tie® Holdowns on Cross-Laminated Timber Panels
L-C-HDCLT21
Simpson Strong-Tie evaluated the HDQ/HHDQ, HDU and HTT holdowns in cross-laminated timber (CLT) panel applications installed with SD and SDS screws.
Engineering Letter

Load Tables

    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.

    For stainless-steel fasteners, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

  1. HHDQ14 requires a heavy-hex anchor nut (supplied with holdown).
  2. HDQ and HHDQ installed horizontally achieve compression loads with the addition of a standard nut on the underside of the load transfer plate. Refer to ICC-ES ESR-2330 for design values. HDQ8 requires a standard nut and BP 7/8-2 load washer (sold separately) on the underside of the holdown for compression load. Design of anchorage rods for compression force shall be per the Designer.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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