
HDQ8/HHDQ Holdown
The HHDQ series of holdowns combines low deflection and high loads with ease of installation. The unique seat design of the HDQ8 greatly minimizes deflection under load. Both styles of holdown employ the Simpson Strong-Tie® Strong-Drive® screws (SDS) which install easily, reduce fastener slip and provide a greater net section area of the post when compared to bolts. They may be installed either flush or raised off the mudsill without a reduction in load value.
Special Features:
Material: HDQ8 - 7 gauge; HHDQ - Body: 7 gauge, washer: 1/2" plate
Finish: HDQ8 - Galvanized; HHDQ - Simpson Strong-Tie® gray paint
Installation:
For holdowns, per ASTM test standards, anchor bolt nut 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.
| Legacy Reports | |||||||
| IAPMO ES ER | ICC-ES ESR | CITY OF LOS ANGELES | STATE OF FLORIDA | ICC-ES NER | ICC-ES ER | ICC-ES ES | |
| HHDQ | See specific model numbers for code listings. | ||||||
| HHDQ11-SDS2.5 | ESR-2330 / ESR-2523 * | RR25720 | FL10441 | ||||
| HHDQ14-SDS2.5 | ESR-2330 / ESR-2523 * | RR25720 | FL10441 | ||||
| HHDQ8-SDS3 | 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
| ORTHOGRAPHIC | PERSPECTIVE | |
| HDQ8 |
HDQ8: DWG | DXF
HDQ8 front view: DWG | DXF HDQ8 left view: DWG | DXF HDQ8 right view: DWG | DXF HDQ8 top view: DWG | DXF |
High Wind-Resistant Construction D89: Holdowns: DWG
| DXF
HDQ8: DWG | DXF |
| HHDQ | None for this model | None for this model |
| HHDQ11 |
HHDQ11: DWG | DXF
HHDQ11 front view: DWG | DXF HHDQ11 left view: DWG | DXF HHDQ11 right view: DWG | DXF HHDQ11 top view: DWG | DXF |
None for this model |
| HHDQ14 |
HHDQ14: DWG | DXF
HHDQ14 front view: DWG | DXF HHDQ14 left view: DWG | DXF HHDQ14 right view: DWG | DXF HHDQ14 top view: DWG | DXF |
None for this model |
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