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Simpson HDQ8-SDS3 14" inch Heavy Duty Holdown with Quick Install Screws


MSRP: $45.99
Price: $45.72
You Save: $0.27 (1 %)
Item Number: HDQ8-SDS3
Manufacturer: Simpson Strong-tie
Manufacturer Part No: HDQ8-SDS3

Simpson HDQ8-SDS3 14" inch Heavy Duty Holdown with Quick Install Screws

The HHDQ series of holdowns combines low deflection and high loads with ease of installation. The unique seat design of the HDQ8 greatly minimizes deflection under load. Both styles of holdown employ the Simpson Strong-Tie Strong-Drive screws (SDS) which install easily, reduce fastener slip and provide a greater net section area of the post when compared to bolts. They may be installed either flush or raised off the mudsill without a reduction in load value.

Special Features:

  • Uses SDS screws which install easily, reduce fastener slip, and provide a greater net section area of the post compared to bolts.
  • SDS screws are supplied with the holdowns to ensure proper fasteners are used.
  • No stud bolts to countersink at openings.

Material: HDQ8—7 gauge; HHDQ - Body: 7 gauge, washer: 1/2" plate

Finish: HDQ8—Galvanized; HHDQ—Simpson Strong-Tie gray paint

Installation:

    • Use all specified fasteners. See General Notes.
    • For use in vertical and horizontal applications.
    • No additional washer is required.
    • To tie multiple 2x members together, the Designer must determine the fasteners required to join members without splitting the wood.
    • See SB and SSTB Anchor Bolts for anchorage options.
    • SDS screws install best with a low speed high torque drill with a 3/8" hex head driver.
    • Refer to Anchor Designer Software for ACI 318 for anchoring solutions.


HDQ8:
    • 5/8" of adjustability perpendicular to the wall.
    • See SSTB Anchor Bolts for anchorage options. For 2-2x and 3x sill plates use SSTBL models. The Designer may specify any alternate anchorage calculated to resist the tension load for a specific job. Anchorage length should take the bearing plate/washer height into account, to ensure adequate length of threads to engage the nut.


HHDQ11/14:
  • No additional washer is required.
  • HHDQ14 requires a heavy hex anchor nut (supplied with holdown)
  • See SB Anchor Bolts for anchorage options
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. Table
  1. Allowable loads have been increased for earthquake or wind load durations with no further increase allowed; reduce where other load durations govern.
  2. The Designer must specify anchor bolt type, length and embedment. See SB and SSTB Anchor Bolts. Refer to Anchor Designer Software for ACI 318 for anchoring solutions.
  3. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. Values in the tables reflect installation into the wide face. See technical bulletin T-SCLCOLUMN for values on the narrow face (edge).
  4. Post design by Specifier. Tabulated loads are based on a minimum 3 1/2" wide post (in a 3 1/2" wall). Post may consist of multiple members provided they are connected independently of the holdown fasteners. See Post Capacities for common post allowable loads.
  5. Tension values are valid for holdowns flush or raised off of sill plate.
  6. Deflection at Allowable Tension Load includes fastener slip, holdown deformation and anchor rod elongation for holdowns installed up to 6" 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.
  7. Tabulated loads may be doubled when holdowns are installed on opposite sides of the wood member provided either the post is large enough to prevent opposing holdown screw interference or the holdowns are offset to eliminate screw interferences.
  8. Noted HHDQ14 allowable loads are based on a 5 1/2" wide post (6x6 min.). All other loads are based on 3 1/2" wide post minimum.
  9. Requires heavy hex anchor nut to achieve tabulated loads (supplied with holdown).
  10. HDQ and HHDQ holdowns installed horizontally can achieve compression loads with the addition of a standard nut on the underside of the load transfer plate. Refer to ESR 2330 for design values. Design of anchorage rods for the compression force shall be per the Designer.

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