Use and Care Manual

68
Copyright © 2020 MiTek Industries, Inc. All Rights Reserved
Holdowns
Holdowns
MiTek
®
Product Catalog
TD / TDX Holdowns
TD – Different welded congurations and sizes achieve a great deal
of versatility within the TD series.
TDX – The TDX2 and TDX5 feature formed designs, all others
are welded. All are self-jigging.
All models, except TD2, TD5, and TD7, feature a self-jigging design
with code required end distances built in. (End distance = 7 bolt
diameters from the top of the sill to the center of the rst bolt hole
in the studs or post.)
Materials: See chart
Finish: TDX5– G90 galvanizing; TDX2-TZ – G-185 galvanizing;
All others – Primer
Codes: See chart for code references
Patents: U.S. Patent No. 5,092,097 – TDX2
Installation:
• Use all specied fasteners. See Product Notes, page 18.
• Do not use lag bolts. Washers are not required for anchor bolts or
between holdown and bolt hex head, but standard washers should
be used against stud or post under the nut. See page 51 for BP/LBP
Bearing Plates.
• Bolt holes should be a minimum of 1⁄32" to a maximum of 1⁄16"
larger than the bolt diameter (as per NDS
®
specications).
• See pages 49-50 for STB Anchor Bolt section for anchorage
options. A design professional may specify alternate anchorage
with conventional anchor bolts.
• A design professional shall determine the adequacy of the stud to
resist published loads. Holdown fasteners specied shall not be
considered to attach multiple plies together.
• Self-jigging models are designed to provide the required minimum
end distance of 7 bolt diameters from the bottom of the stud or
post to the centerline of the rst bolt hole.
• Tighten anchor bolt nuts nger tight to base plus 1/3 to 1/2 additional
turns with a wrench. Wood members may shrink over time; if possible,
nut tightness should be checked periodically.
• If used to anchor a built-up post, such as a double 2x4, the post
component shall be designed to act as a single unit.
Typical TDX2-TZ
installation
Holdown installation
between oors
Typical TDX2-TZ
back-to-back
installation
Typical TD15
installation
TDX6
TDX2-TZ
Typical TDX6
installation
Moisture barrier
may be required
TD15 = 3-3/8"
TD9 & TD12 = 3-1/2"
Use standard cut washer,
metal plate, or metal strip
between nut and stud per
NDS. City of Los Angeles
requires use of BP bearing
plates between nut and stud.
End distance
Wall stud
Threaded
rod
H
D
W
CL
3-1/2"
BH
9/16"
H
D
W
CL
3-1/2"
BH
9/16"
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