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Simpson HDC10/4-SDS2.5 Heavy Duty Concentric Holdown


Price: $93.27
Item Number: HDC10/4-SDS2.5
Manufacturer: Simpson Strong-tie
Simpson HDC10/4-SDS2.5 Heavy Duty Concentric Holdown
The unique design of the HDC holdowns eliminate eccentricity. They install with Simpson Strong-Tie Strong-Drive SDS screws (included) to reduce slip and provide a greater net section area of the post compared to bolts.

Material: 10 gauge strap

Finish: Galvanized strap, aluminum base

  • Use all specified fasteners. See General Notes.
  • Install on concrete.
  • For use in vertical and horizontal applications.
  • Sized for 2-2x, and 4x. Center 2-2x posts on holdown.
  • Uses SDS screws supplied with the holdowns to ensure proper fasteners are used.
  • Slot in the seat allows for 3/8" of adjustment perpendicular to plate.
  • Cut washer required between base and anchor nut. HDC10 models use narrow cut washer with outside diameter of 1 3/4".
  • Witness slot in the base to inspect the nut.
  • Maximum anchor bolt height above concrete is 2 1/8".
  • To tie multiple 2x members together, the Designer must determine the fasteners required to join members without splitting the wood.
  • Aluminum standoff cannot be in contact with preservative-treated wood.
  • 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.
Table
  1. 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.
  2. Loads are based on static tests on wood studs, limited by the lowest of 0.125" deflection, tested lowest ultimate divided by 3, or the wood screw value.
  3. Deflection at Highest Allowable Tension Load includes fastener slip, holdown elongation, and anchor bolt elongation.
  4. The HDCs will be limited by wood compression capacity if installed on a sill plate. HDC10/22 will achieve an allowable load of 4005 lbs. on a DFL plate. HDC10/4 will achieve an allowable load of 4940 lbs. on a DFL plate, which does not take deflection into account. Full tension values apply when installed on a sill, deflections may be higher.
  5. Higher values may be obtained when HDC is not placed at an edge or with f'c concrete strength > 2500 psi.
  6. 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 bulletinn T-SCLCOLUMN for values on the narrow face (edge).
  7. Post design shall be by Designer. See Post Capacities for common post allowable loads.

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