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RTUD Ratcheting Take-Up Device


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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 shrinkage compensation solution for continuous rod systems. The RTUD is threaded rod diameter specific and allows for unlimited shrinkage. 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. 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.

Key Features

  • Maintains rod-system tightness, allowing it to perform as designed
  • Pass-through design provides unlimited shrinkage compensation
  • Available for 3/8", 1/2", 5/8" and 3/4" diameter threaded rod
  • 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

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
Bearing Plates
Length Width Height
RTUD4B 1/2 2 3/4 1 1/2 1 9,210 0.040 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
  1. Allowable loads are for 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 or 1A in accordance with ANSE/ASME B1.1.
  3. No further increase in allowable load is permitted.
  4. RTUD4B fastens to the wood plate with the BPRTUD bearing plate and (2) #9 x 1 1/2" or 2 1/2" Strong-Drive SD Connector screws. RTUD5-6 fastens to the wood plate with the BPRTUD bearing plate and (2) #9 x 2 1/2" Strong-Drive SD Connector screws.
  5. The specified minimum tensile strength, Fu, of the threaded rod must not exceed 125 ksi for the RTUD4B, RTUD5 and RTUD6.

* Refer to BPRTUD table below.

BPRTUD Technical Data
Model No. Length
Thickness Hole Diameter
Allowable Loads (lbs.) (160)2
BPRTUD3-4B 3 1/2 3 3 ga. 5/8 6,415 5,975 4,475 4,700
BPRTUD5-6A 4 1/2 3 3 ga. 1 7,080 6,575 5,175 5,355
BPRTUD5-6B 5 1/2 3 1/2 in. 1 10,295 9,305 6,670 7,000
BPRTUD5-6C 7 1/2 3 3/4 in. 1 13,385 12,100 8,675 9,105
  1. No further increase in allowable load permitted.
  2. Plate bearing area based on rod diameter plus 1/4"-diameter drilled hole through wood plate below steel bearing plate. Reduce allowable load per code for larger holes.
  3. Bearing plate load capacity is based on the steel plate bearing on the wood sole plate perpendicular to the grain and steel plate bending in cantilever action.

Code Reports & Compliance