HDC Concentric Holdown

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HDC 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

Installation:

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.

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 not to over-torque the nut. Impact wrenches should not be used.

top Gallery:

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HDC10 Patents: U.S. 6,513,290 Canada 2,364,585		Typical HDC Installation with 2-2x4 studs (Similar with 2-2x6 studs)

top Load Table: See code report listings below

The Designer must specify anchor bolt type, length and embedment. See SB and SSTB Anchor Bolts.
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.
Deflection at Highest Allowable Tension Load includes fastener slip, holdown elongation, and anchor bolt elongation.
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.
Higher values may be obtained when HDC is not placed at an edge or with f'_c concrete strength > 2500 psi.
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).
Post design shall be by Designer. See Post Capacities for common post allowable loads.

top Code Reports (PDFs):

					Legacy Reports
	IAPMO UES ER	ICC-ES ESR	CITY OF LOS ANGELES	STATE OF FLORIDA	ICC-ES NER	ICC-ES ER	ICC-ES ES
HDC	See specific model numbers for code listings.
HDC10/22-SDS2.5		ESR-2330 / ESR-2523 *
HDC10/4-SDS2.5		ESR-2330 / ESR-2523 *
HDC5/22-SDS2.5	No code listing. Please contact us for test data.
HDC5/4-SDS2.5	No code listing. Please contact us for test data.

* 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
HDC	None for this model	High Wind-Resistant Construction D100: Holdowns: Typical HDC Installation with 2-2x4 Studs: DWG \| DXF HDC: DWG \| DXF
HDC10/22	HDC10/22: DWG \| DXF HDC10/22 front view: DWG \| DXF HDC10/22 left view: DWG \| DXF HDC10/22 right view: DWG \| DXF HDC10/22 top view: DWG \| DXF	None for this model
HDC10/4	HDC10/4: DWG \| DXF HDC10/4 front view: DWG \| DXF HDC10/4 left view: DWG \| DXF HDC10/4 right view: DWG \| DXF HDC10/4 top view: DWG \| DXF	None for this model
HDC5/22	HDC5/22: DWG \| DXF HDC5/22 front view: DWG \| DXF HDC5/22 right view: DWG \| DXF HDC5/22 top view: DWG \| DXF	None for this model
HDC5/4	HDC5/4: DWG \| DXF HDC5/4 front view: DWG \| DXF HDC5/4 right view: DWG \| DXF HDC5/4 top view: DWG \| DXF	None for this model