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HDU Holdown

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HDU Holdowns are pre-deflected during the manufacturing process, virtually eliminating deflection under load due to material stretch. They use Simpson Strong-Tie® Strong-Drive® screws (SDS) which install easily and provide reduced fastener slip. Using SDS screws results in a greater net section, when compared to bolts, as no material is removed.

The HDU series of holdowns are designed to replace previous versions of the product such as PHD’s as well as bolted holdowns. The HDU2, 4 and 5 are direct replacements for the PHD2, 5 and 6, respectively.

For more information on holdown options, contact Simpson Strong-Tie.

Special Features:

Material: See table.

Finish: Galvanized.

Installation:

For holdowns, per ASTM test standards, anchor bolt nuts 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.

top Gallery:
  roll over images below to see larger image
 
HDU
U.S. Patent
6,112,495
Typical HDU Tie Between Floors
 
Vertical HDU Installation   Horizontal HDU Offset Installation
(Plan View)
See footnote 7.

top Load Table:See code report listings below
Table
  1. Allowable loads have been increased for wind or earthquake 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. Allowable load values are based on a minimum wood member thickness in the direction of the fastener penetration. Posts may consist of multiple 2x members provided they are designed to act as one unit independently of the holdown fasteners. Holdowns shall be installed centered along the width of the attached post.
  5. Tension values are valid for holdowns flush or raised off of sill plate.
  6. Deflection at Highest Allowable Tension Load includes fastener slip, holdown elongation, and anchor bolt elongation (L = 6"). Additional elongation of anchor bolts longer than 6" shall be added to holdown deflection.
  7. Tabulated loads may be doubled when the HDU is installed on opposite sides of the wood member provided either the post is large enough to prevent opposing holdown screw inferference or the holdowns are offset to eliminate screw interferences.
  8. Noted HDU14 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).
next  top Code Reports (PDFs):
Legacy Reports
  IAPMO ES ER ICC-ES ESR CITY OF LOS ANGELES STATE OF FLORIDA ICC-ES NER ICC-ES ER ICC-ES ES
HDUSee specific model numbers for code listings.
HDU11-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU11-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU14-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU14-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU2-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU4-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU5-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      
HDU8-SDS2.5  ESR-2330 / ESR-2523 * RR25720 FL10441      

* ESR-2523 is an Index of many of Simpson Strong-Tie Stamped and Welded Cold-formed Steel Products for Wood or Cold-formed Steel Construction

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 ORTHOGRAPHIC
PERSPECTIVE
HDUNone for this model None for this model
HDU11-SDS2.5None for this model None for this model
HDU11-SDS2.5None for this model None for this model
HDU14-SDS2.5None for this model None for this model
HDU14-SDS2.5None for this model None for this model
HDU2-SDS2.5None for this model None for this model
HDU4-SDS2.5None for this model None for this model
HDU5-SDS2.5None for this model None for this model
HDU8-SDS2.5None for this model None for this model

   
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