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HDU Holdown

HDU

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The HDU is designed for use in shearwalls and braced-wall panels, as well as other lateral applications in wood construction. The HDU uses 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 holdown to ensure proper fasteners are used
  • Predeflected seat eliminating deflection under load
  • No stud bolts to countersink at openings

Material

  • See table

Finish

  • Galvanized

Installation

  • See General Notes for Holdowns and Tension Ties.
  • The HDU requires no additional washer.
  • Strong-Drive SDS Heavy-Duty Connector screws install best with a low-speed, high-torque drill equipped with a 3/8" hex-head driver.
  • Fasteners and crescent washer are included with the holdowns. For replacements, order part no. SDS25212-HDU_. (Fill in the size needed, e.g., HDU2.)

Related Literature

Product Information Table

Fastener Production Information and Stuff & Things
Model No. Ga. W (in.) H (in.) B (in.) CL (in.) SO (in.) Coating/Material Product Includes Packaging Qty.
HDU11-SDS2.5 10 3 22 1/4 3 1/2 1 3/8 1 1/2 Zinc Galvanized, G90 (30) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU11-SDS2.5HDG 10 3 22 1/4 3 1/2 1 3/8 1 1/2 Hot-Dip Galvanized (30) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU14-SDS2.5 7 3 25 11/16 3 1/2 1 9/16 1 9/16 Zinc Galvanized, G90 (36) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, (1) crescent washer and (1) heavy-hex anchor nut 1
HDU14-SDS2.5HDG 7 3 25 11/16 3 1/2 1 9/16 1 9/16 Hot-Dip Galvanized (36) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws, (1) crescent washer and (1) heavy-hex anchor nut 1
HDU2-SDS2.5 14 3 8 11/16 3 1/4 1 5/16 1 3/8 Zinc Galvanized, G90 (6) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU2-SDS2.5HDG 14 3 8 11/16 3 1/4 1 5/16 1 3/8 Hot-Dip Galvanized (6) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU4-SDS2.5 14 3 10 15/16 3 1/4 1 5/16 1 3/8 Zinc Galvanized, G90 (10) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU4-SDS2.5HDG 14 3 10 15/16 3 1/4 1 5/16 1 3/8 Hot-Dip Galvanized (10) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU5-SDS2.5 14 3 13 3/16 3 1/4 1 5/16 1 3/8 Zinc Galvanized, G90 (14) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU5-SDS2.5HDG 14 3 13 3/16 3 1/4 1 5/16 1 3/8 Hot-Dip Galvanized (14) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU8-SDS2.5 10 3 16 5/8 3 1/2 1 3/8 1 1/2 Zinc Galvanized, G90 (20) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1
HDU8-SDS2.5HDG 10 3 16 5/8 3 1/2 1 3/8 1 1/2 Hot-Dip Galvanized (20) 1/4 in. x 2-1/2 in. Strong-Drive SDS Heavy-Duty Connector screws and (1) crescent washer 1

Load Tables

  These products are available with additional corrosion protection.

HDU Load Table
  1. HDU14 requires heavy-hex anchor nut to achieve tabulated loads (supplied with holdown).
  2. Where noted in table, loads are applicable to installation on either the narrow or the wide face of the post.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT