Holdowns & Tension Ties
HDQ8/HHDQ Holdowns Minimum Wood Member Thickness
Preservativetreated barrier may be required.
HDQ8 Vertical Installation
SO
Holdowns & Tension Ties
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 ® SDS Heavy-Duty Connector screws which install easily, reduce fastener slip and provide a greater net section when compared to bolts. They may be installed either flush or raised off the mudsill without a reduction in load value. SPECIAL FEATURES: • Uses Strong-Drive SDS Heavy-Duty Connector screws which install easily, reduce fastener slip, and provide a greater net section area of the post compared to bolts. • Strong-Drive SDS Heavy-Duty Connector screws are supplied with the holdowns to ensure proper fasteners are used. • No stud bolts to countersink at openings. MATERIAL: HDQ8—7 gauge; HHDQ—Body: 7 gauge, washer: 1⁄2" plate FINISH: HDQ8—Galvanized; HHDQ— Simpson Strong-Tie® gray paint INSTALLATION: • See General Notes on page 45. • No additional washer is required. • Strong-Drive SDS Heavy-Duty Connector screws install best with a low speed high torque drill with a 3⁄8" hex head driver. HDQ8: • 5⁄8" of adjustability perpendicular to the wall. HHDQ11/14: • No additional washer is required. • HHDQ14 requires a heavy hex anchor nut (supplied with holdown) CODES: See page 12 for Code Reference Key Chart.
HDQ8
U.S. Patents 6,006,487 and 6,327,831 Minimum Wood Member Thickness
Hanger not shown for clarity SO
HHDQ11
(HHDQ14 similar)
Vertical HHDQ11 Installation (HHDQ14 similar)
C-C-2015 © 2015 SIMPSON STRONG-TIE COMPANY INC. PRINTED 12/14
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Horizontal HDQ8 Installation
These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.
Model No.
HDQ8-SDS3
Dimensions (in.)
Fasteners
Ga
7
W
H
B
CL
SO
2 ⁄8
14
2 ⁄2
1 ⁄4
2 ⁄8
7
1
1
3
HHDQ11-SDS2.5
7
3
15 1⁄8
3 1⁄2
1 1⁄2
7
HHDQ14-SDS2.5
7
3
18 3⁄4
3 1⁄2
1 1⁄2
7
Anchor Bolt Dia. (in.) ⁄8
7
SDS Screws
Minimum Wood Member Thickness 4 (in.)
Allowable Tension Loads (160) Deflection at DF/SP SPF/HF Allowable Load 6 (in.)
20-SDS 1⁄4"x3"
3
5715
4115
0.064
20-SDS 1⁄4"x3"
3 1⁄2
7630
5495
0.094
20-SDS 1⁄4"x3"
4 1⁄2
9230
6645
0.095
5 1⁄2
11810
8505
0.131
7 1⁄4
13015
9370
0.107
5 1⁄22
13710
10745
0.107
⁄8
1
24-SDS 1⁄4"x2 1⁄2"
⁄8
1
30-SDS 1⁄4"x2 1⁄2"
Code Ref.
I6, L8, F5
1. See page 45 for Holdown and Tension Tie General Notes. 2. Noted HHDQ14 allowable loads are based on a 5 1⁄2" wide post (6x6 min.) Other loads based on 3 1⁄2" wide post minimum. 3. HHDQ14 requires heavy-hex anchor nut (supplied with holdown). 4. HDQ and HHDQ installed horizontally achieve compression loads with the addition of a standard nut on the underside of the load transfer plate. Refer to ICC-ES ESR 2320 for design values. HDQ8 requires a standard nut and BP7⁄8-2 (sold separately) load washer on the underside of the holdown for compression load. Design of anchorage rods for compression force shall be per the Designer.
47