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ATUD/TUD Take-Up Device

Strong-Rod® URS Components

This product's information may differ depending on the category of use. You are currently viewing details related to Strong-Rod® URS Components. You can also view product information related to the category: Strong-Rod® ATS Components

The ATUD and TUD expanding take-up devices are suitable for rod diameters from 1/2" up to 2" and shrinkage up to 3". Expanding screw-style take-up devices provide the lowest device displacements. For installation, ensure that the activation pin is pointing up and facing toward the inside of the building space. The pin can be pulled anytime after the nut has been tightened onto the top bearing plate and must be pulled by the time the building is fully loaded. Shrinkwrap should remain on the device until the pin is ready to be pulled. Before activating an ATUD make sure the pin on the take-up device on the floor below has been pulled.

The ATUD and TUD are now rated as UL-qualified through-penetration firestop systems. The devices received F (flame) and T (temperature) ratings per ASTM E814 when they are installed in conjunction with the Simpson Strong-Tie BPRTUD steel bearing plate (RTUD) or the PL steel bearing plate with top plate and nut (ATUD and TUD), eliminating the need for additional fire resistance material at the hole in the plate.

Key Features

ATUD Features

  • Easy to install
  • Lowest device deflection
  • Fits up to 2" diameter rods

TUD Features

  • Easy to install
  • Lowest device deflection
  • Coated for corrosion protection and lubricity
  • Fits up to 1-1/4" diameter rods

Material

  • ATUD — ASTM B221 6061-T6511 aluminum; TUD — ASTM A311 Class B, Grade 1144

Finish

  • ATUD — none; TUD — corrosion resistant finish

Installation

  1. Install the specified bearing plate over the threaded rod onto the bottom plate of the wall.
  2. Install ATUD/TUD, with either end up, over the threaded rod and onto the bearing plate with the activation pin facing out.
  3. Install specified plate washer and then nut on top.
  4. Finger-tighten nut plus an additional 1/3- to 1/2-turn with a wrench.
  5. Remove shrink wrap from ATUD/TUD.
    IMPORTANT: Do not remove activation pin until nut is installed.
  6. Remove activation pin.

Related Literature

RTUD and ATUD Now UL Listed as a Through-Penetration Firestop System
S-L-SRSFIREUL22
A sales flier on the UL listing for the Strong-Rod® Systems RTUD and ATUD components.
Flier
Connectors and Fasteners for Mass Timber Construction Catalog
C-C-MASSTIMBER20
A catalog featuring connectors and fasteners for mass timber and CLT construction solutions.
Catalog
Strong-Rod® Systems Seismic and Wind Restraint Systems Guide
F-L-SRS21
A design guide explaining how to specify Strong-Rod anchor tiedown systems for shearwall overturning restraint and the uplift restraint system for roofs.
Flier
Installation Guide for Simpson Strong-Tie® Take-Up Devices with Holdowns
T-L-TUDHD21
A technical bulletin providing technical information on the installation of take-up devices with raised-floor shearwalls and holdowns.
Technical Bulletin

Load Tables

ATUD/TUD Models

ATUD/TUD Models Load Table
  1. Allowable compression capacities are for TUD or ATUD only and are based on ICC-ES ESR-2320.
  2. No further increase in allowable load is permitted.
  3. Total device deflection = ΔT = ΔR + ΔA(PD/PA), where PD = Demand Load; PA = Allowable Load.
  4. For cases where the ATUD14-1 bears on a PL16, the smallest diameter threaded rod that should be used with this device is a 1 1/4". If bearing on a PL14, use the ATUD14-2 compatibility.

Fire Rating

Fire Rating Table
  1. The F-rating criteria prohibits flame passage through the system and requires acceptable hose-stream test performance.
  2. The T-rating criteria prohibits flame passage through the system and requires the maximum temperature rise on the unexposed surface of the wall or floor assembly, on the penetrating item and on the fill material not to exceed 325°F above ambient, and requires acceptable hose-stream test performance.
  3. The L-rating criteria determines the amount of air leakage in cubic feet per minute per square foot of opening (CFM/sq.ft.) or in cubic feet per minute per unit (CFM/unit) for fixed-size opening units, through the firestop system at ambient and /or 400°F air temperatures at an air-pressure differential of 0.011 psi. L-rating listed is for both ambient temperature and at 400°F.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT