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HDU Holdown

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The HDU series of holdowns are the latest in a long series of innovations from Simpson. These holdowns combine the advantages of low deflection and high capacity from the pre-deflected geometry with the ease of installation of Simpson's patented SDS screws.

HDU 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:
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HDU Vertical HDU Installation

top Load Table:
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.
  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.
  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 and raised off of sill plate.
  6. Deflection at Highest Allowable Tension Load includes fastener slip, holdown elongation, and anchor bolt elongation (L = 5"). Additional elongation of anchor bolts longer than 5" 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.
  10. Allowable loads are based on criteria in ICC-ES AC155. Therefore, they are the lower of the strength determined from the test value on a wood jig divided by 3.0, the load at the AC155 deflection limit, and the fastener calculation based on the 2005 NDS.
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 No code listing. Please contact us for test data.
HDU11-SDS2.5  ESR-2330 RR25720 FL6482      
HDU14-SDS2.5  ESR-2330   FL10246      
HDU2 No code listing. Please contact us for test data.
HDU2-SDS2.5  ESR-2330 RR25720 FL6482      
HDU4 No code listing. Please contact us for test data.
HDU4-SDS2.5  ESR-2330 RR25720 FL6482      
HDU5 No code listing. Please contact us for test data.
HDU5-SDS2.5  ESR-2330 RR25720 FL6482      
HDU8 No code listing. Please contact us for test data.
HDU8-SDS2.5  ESR-2330 RR25720 FL6482      

   
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