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RTUD Ratcheting Take-Up Device

Strong-Rod® ATS Components

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

The RTUD ratcheting take-up device is a cost-effective wood shrinkage compensation solution for continuous threaded rod systems. The RTUD is rod-diameter specific and allows for unlimited shrinkage. It is hand-installed on top of the BPRTUD (bearing plate), and after the SD9 screws have fastened the take-up device through the bearing plate and into the wood sole plate, the device provides continuous engagement with the rod, enabling the system to perform as designed at all times.

RTUD devices 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

  • Maintains rod-system tightness, allowing it to perform as designed
  • Pass-through design provides unlimited shrinkage compensation
  • Available for threaded rod in a range of diameters
  • Very minimal force required to allow rod to pass through take-up device, so mitigating rod buckling during wood shrinkage


  • High-strength steel inserts and mild-strength outer body


  • Corrosion-resistant finish


  • The RTUD should be hand-installed until the base of the device fully bears on top of the BPRTUD
  • Once the fastener holes are aligned and the RTUD is flush, install the Strong-Drive® fasteners
  • 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

Patent Information

  • US Patents 9,394,706; 8,881,478; RE48,981

Related Literature

Load Tables

RTUD Technical Data

Model No. Threaded
Rod Dia. (in.)
Dimensions (in.) Allowable Load
Seating Increment ΔR
Deflection at
Allowable Load ΔA
Average Ratcheting Force (lb.) Compatible
Bearing Plates
Length Width Height
RTUD3B 3/8 2 3/4 1 1/2 1 5,180 0.044 0.010 20 BPRTUD3-4B
RTUD4B 1/2 2 3/4 1 1/2 1 9,210 0.045 0.003 20 BPRTUD3-4B
RTUD5 5/8 3 7/8 2 1 3/8 14,495 0.056 0.007 20 BPRTUD5-6, 5-8
RTUD6 3/4 3 7/8 2 1 3/8 20,830 0.057 0.010 15 BPRTUD5-6, 5-8
RTUD7 7/8 4 1/2 2 1/4 2 28,185 0.059 0.012 30 BPRTUD7-8, 5-8
RTUD8 1 4 1/2 2 1/4 2 33,135 0.066 0.013 30 BPRTUD7-8, 5-8
RTUD9 1 1/8 6 1/4 3 3 1/4 38,830 0.07 0.021 25 BPRTUD9-10
RTUD10 1 1/4 6 1/4 3 3 1/4 47,935 0.071 0.025 30 BPRTUD9-10
  1. Allowable loads for the RTUD only. The attached components must be designed to resist design loads in accordance with the applicable code.
  2. Thread specification for threaded rod used with the RTUD must be UNC Class 2A, in accordance with ANSE/ASME B1.1, unless where ASTM A307 Grade A threaded rod is specified, then UNC Class 1A thread may be accepted per ASME B18.
  3. No further increase in allowable load is permitted.
  4. 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.
  5. The RTUD fastens to the wood plate with the BPRTUD bearing plate and (2) #9 x 2 1/2" Strong-Drive SD Connector screws.
  6. The specified minimum tensile strength, Fu, of the threaded rod must not exceed 125 ksi.

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