Page 127 - Cable Art Inc Catalog

Structural Rod Systems

Turnbuckle Overview

Applications Threads
Turnbuckles are used to provide length and tension adjustment Standard threads are UNC 2B, RH/LH, with other thread
of tie rods and hanger assemblies. They are widely used in series and profiles also available by special order. Hot
structural steel bracing and pipe support applications. dip galvanized turnbuckles are normally tapped oversize
after galvanizing to accommodate the zinc coating on
the rod threads.
Dimensions
Refer to the turnbuckle table for turnbuckle body
dimensions. Please note that the nut area is round
instead of hex-shaped for the 2-1/4” and 2-1/2” sizes.

Typical turnbuckle application Turnbuckle with hexagonal ends

Relevant Standards
Our forged turnbuckle bodies are manufactured to
meet ASTM F1145, Type 1, Grade 1 Class B. They also
meet the dimensions and load ratings shown in the STRUCTURAL ROD SYSTEMS
American Institute of Steel Construction Inc. (AISC) Steel
Construction Manual, 13th edition, page 15-16.
Materials
We stock turnbuckle bodies in C1035 steel. Heat-treated
carbon steel turnbuckle bodies and stainless steel
turnbuckle bodies are available by special order.
Finishes Turnbuckle with round ends
Standard finish is plain steel, shot blasted after forging. Hot
dip galvanizing is available as well as zinc electroplating.

Notes Regarding Strength
ASTM F1145 and Federal Specification FF-T-791b tabulate
the recommended working loads and minimum breaking
strengths for each size of turnbuckle body. Our turnbuckles
meet the slightly higher safe working loads listed in the
table which are taken from the AISC Manual of Steel
Construction. These safe working loads are based on
safety factor of 5:1.

115

Cat21 S7 98-117.indd 115 12/3/20 12:48 AM