Specification

ManualsBrandsSimpson Strong-Tie ManualsKitchen1/2 in. Ratcheting Take-Up Device

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.

FEATURES:

• Maintains rod-system tightness, enabling it to perform as designed

• Pass-through design provides unlimited shrinkage compensation

• Available for

⁄8" and

⁄2" diameter threaded rod

• Fastens easily to the wood plate with the BPRTUD3-4

bearing plate and (2) 8dx1

⁄2" nails (minimum) or (2)

#9x1

⁄2" Strong-Drive

SD structural-connector screws

INSTALLATIONS:

• See the General Notes in the Simpson Strong-Tie

Wood Construction Connectors catalog.

• RTUD3 and RTUD4 must be installed with the BPRTUD3-4 bearing

plate (sold separately) to function properly within a rod system

• Additional instructions on back page

CODES:

ICC-ES ESR-2320

RTUD4 (RTUD3 Similar)

(Patent Pending)

RTUD Ratcheting Take-Up Device

BPRTUD3-4

(Sold Separately)

1. ATR: all-thread rod tensile capacity shown is for ASTM F1554

Grade 36, A36 or A307 standard steel, F

= 58ksi.

2. Thread specification for threaded rod must be UNC Class 2A, in accordance with ANSI/ASME B1.1.

3. No further increase in allowable load permitted.

4. Bearing plate loads based on

⁄4" diameter hole through wood plate below steel

bearing plate. Modify allowable load per code for different hole size.

Model No.

Threaded

Rod Dia.

(in.)

Dimensions (in.)

Allowable

Load

(lbs.)

Seating

In c r em e n t

∆

(in.)

Deflection

at Allowable

Load

∆

(in.)

Length Width

Height

RTUD3

⁄8 2

⁄8 1

⁄4

⁄16 3335 0.053 0.015

RTUD4

⁄2 2

⁄8 1

⁄4

⁄16 6665 0.048 0.011

Model No.

Length

(in.)

Width

(in.)

Thickness

(ga.)

Allowable Loads (lbs.) (100/160)

½" Dia.

ATR

(lbs.)

⅜" Dia.

ATR

(lbs.)

DF SP SPF

BPRTUD3-4 3 3 3 5965 5390 4055 4270 2400

1. Allowable loads are for RTUD only. The attached components must be designed to

resist design loads in accordance with the applicable code. See table below.

2. Thread specification for threaded rod must be UNC Class 2A, in accordance with ANSI/ASME B1.1.

3. No further increase in allowable load permitted.

Summary of content (2 pages)

PAGE 1
RTUD Ratcheting Take-Up Device 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.
PAGE 2
RTUD Ratcheting Take-Up Device RTUD Installation and Design Notes for Simpson Strong-Tie® Rod Systems 1. 2. 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 structural-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.