RTUD Ratcheting Take-Up Device
Strong-Rod™ ATS Components
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The RTUD ratcheting take-up device is a cost-effective shrinkage compensation solution for continuous rod systems. The RTUD is now code-listed for use with rod systems to ensure highly reliable performance in a device that allows for unlimited shrinkage. Once the RTUD is installed, a series of internal threaded wedges enable the device to ratchet down the rod as the wood structure shrinks, but engage the rod in the reverse direction when under tensile loading. Continuous engagement is maintained on the rod at all times by the take-up device, enabling the rod system to perform as designed from the time of installation.
- Maintains rod-system tightness, allowing it to perform as designed
- Pass-through design provides unlimited shrinkage compensation
- Available for 1/2", 5/8" and 3/4" diameter threaded rod
- Fastens easily to the wood plate with the BPRTUD bearing plate and (2) 8dx1 1/2" nails (minimum) or (2) #9x1 1/2" Strong-Drive® SD Connector screws (not included)
- 1.33-degree rod offset (1 3/4" max) allowed per floor
- Very minimal force required to allow rod to pass through take-up device to mitigate rod buckling during wood shrinkage
RTUD—ASTM A732; BPRTUD—3 Gauge
RTUD—Corrosion-resistant finish; BPRTUD—None
The RTUD3 or RTUD4 must be installed on top of the BPRTUD3-4 bearing plate and fastened through the bearing plate to the wood top plates or bottom plate with (2) 8dx1 1/2" min. nails or (2) #9x1 1/2" Strong-Drive® SD Connector screws.
- In order for the RTUD to ratchet properly, rods must be installed at less than 1.33° from vertical or 1 3/4" offset per floor whichever is less.
- Carefully align the holes through the wood floor system so they align vertically (through top plates, floor sheathing and bottom plate). If misaligned, the rod will be installed at an angle that may bind on the wood framing.
- The RTUD compensates for an unlimited amount of wood shrinkage provided there are no obstructions to the travel of the RTUD along the length of the threaded rod and adequate clearance above the RTUD. Holes in the wood top or bottom plates must be oversized adequately to allow the all-thread rod to freely pass through. The more vertical the rod, the smaller the possible hole diameter.
- The Designer should verify maximum hole size in plates to ensure there is enough shear capacity – for drag and chord forces in plates – and bearing capacity due to area of bearing plate compared to area of wood plate beneath.
- Simpson Strong-Tie does not require the all-thread rod be pre-tensioned when used with RTUD. The rod will normally feel "loose." However, as long as the RTUD is firmly seated on the bearing plate, and the rod can move freely through the lumber and RTUD, the system is properly installed.
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STRONG-ROD™ SYSTÈMES de retenue contre les renversements pour les bâtiments à plusieurs étagesC-L-SRSCAN16CFConception aux états limites canadiens pour le système d’arrimage Strong-Rod™. Informations sur produits, méthodes de conception, séries précalculées avec compensation du retrait et autres composants.Catalog
High Wind-Resistant Construction Application GuideF-C-HWRCAG16The newly updated High Wind-Resistant Construction Application Guide offers new applications, updated loads, as well as more fastening information that is used to resist high-wind.Product Guide
Strong-Rod™ Systems RTUD Ratcheting Take-Up DeviceF-L-RTUD15This flier introduces Designers to the RTUD5 and RTUD6. It includes features and benefits, installation instructions, and load tables. It also contains complementary information for the BPRTUD5-6.Flier
Installation Guide for Simpson Strong-Tie® Take-Up DevicesT-L-TUDINSTLL17A technical bulletin covering the installation of take-up devices with raised-floor Strong-Wall® Shearwalls and holdowns.Technical Bulletin
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Rod Dia. (in.)
|Dimensions (in.)||Allowable Load
|Seating Increment ΔR
Allowable Load ΔA
|RTUD3||3/8||2 3/8||1 1/4||15/16||3,335||0.053||0.015||BPRTUD3-4||URS|
|RTUD4||1/2||2 3/8||1 1/4||15/16||6,665||0.048||0.011||BPRTUD3-4||ATS/URS|
|RTUD4B||1/2||2 3/4||1 1/2||1||9,210||0.0396||0.003||BPRTUD3-4B||ATS/URS|
|RTUD5||5/8||3 7/8||2||1 3/8||14,495||0.056||0.007||BPRTUD5-6*||ATS/URS|
|RTUD6||3/4||3 7/8||2||1 3/8||20,830||0.057||0.010||BPRTUD5-6*||ATS/URS|
|Allowable Loads (lbs.) (160)2|
|BPRTUD3-4B||3 1/2||3||3 ga.||6,415||5,975||4,475||4,700|
|BPRTUD5-6A||4 1/2||3||3 ga.||7,080||6,575||5,175||5,355|
|BPRTUD5-6B||5 1/2||3||1/2 in.||10,295||9,305||6,670||7,000|
|BPRTUD5-6C||7 1/2||3||3/4 in.||13,385||12,100||8,675||9,105|
|Part||IAPMO UES ER||ICC-ES ESR||City of Los Angeles||State of Florida|
|BPRTUD||No code listing. Please contact us for test data.|
|BPRTUD3-4||No code listing. Please contact us for test data.|
|BPRTUD5-6||No code listing. Please contact us for test data.|
|RTUD||See specific model numbers for code listings.|