ClarkDietrich Holdown (CD Series)



ClarkDietrich holdowns provide cost-effective shearwall attachment and are used to transfer tension loads between floors or from structural members to the foundation.

Two-piece welded construction comes in three sizes for optimal performance. Installation is made easy with prepunched holes. 

Material: 7 Gauge (179mil) with 1/2" bearing plate

ASTM: A36, A1011

Anchor hole size:

7/8" x 1-1/8" for CD8 & CD10

1" x 1-1/8" for CD15



Product Data & Ordering Information

Product code Simpson reference Gauge Mils Design thickness (in) Size (in) Packaging
CD8 S/HD8S 7 179 0.188 2-5/8 x 11 Dependent on Order Quantity
CD10 S/HD10S 7 179 0.188 2-5/8 x 13-1/2
CD15 S/HD15S 7 179 0.188 2-5/8 x 19



  • Install the holdowns using anchor bolts or alternate anchorage calculated to resist the tension load for your specific application. 
  • Use steel nylon locking nuts or thread adhesive to minimize the chance of nut spin. Anchor bolt washer is not required.
  • Secure the CD holdown to the steel framing member by filling all the prepunched holes with #14 screws to achieve listed capacities.
  • Boundary members (back-to-back studs) shall be designed by a qualified professional. To tie back-to-back stud members together, the Designer must determine the fasteners required to bind members to act as one unit.
  • CD holdowns can be welded per Designer's recommendation and specification.
  • Welding procedures shall be qualified as specified in AWS D1.3.
  • Welded connections used for cold-formed steel structural members in which the thickness of the thinnest connected part is 0.18 inch or less shall comply to AISI S100-2012 specification Section E2.

Reference section R603.9.4.2 of the International Residential Code (IRC) for holdown requirements in residential applications. Consult the engineer of record for commercial applications.


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