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How To Select Turnbuckles
Turnbuckles are used to take up slack and apply tension to a rigging assembly.
They are designed to be loaded in straight pull, inline applications. They come in a variety of types, sizes, and coatings to suit many suspending, tie down, and tensioning type applications.
Turnbuckles are categorized by thread diameter, take up length, and end fittings.
Thread diameter refers to the diameter of the threaded portion of the end fittings. Larger thread diameters will have a greater load carrying capacity than smaller thread diameters.
Take Up Length
Take up refers to the total length that the end fittings can screw in and out of the turnbuckle body to take up tension.
To increase the amount of total take-up capability in your system, either choose a turnbuckle with more take-up, or attach 2 or more turnbuckles together, in line.
Turnbuckles can tension assemblies without twisting them up because one end fitting is left hand threaded and the other is right hand threaded. This design feature ensures only the turnbuckle body twists when tensioning.
Sizing Turnbuckles to Other Rigging Components
It is important to note that the working load limit should always be taken into consideration when sizing and matching turnbuckles to other rigging components.
For example, a 1/4”x 4” turnbuckle has a much lower working load limit than ¼” cable or ¼” eyebolt, and the fittings may not connect easily. Up-size the turnbuckle to a size that more closely matches or exceeds the working load limit of the rest of the assembly or a working load limit that meets your loading requirements.
E-Rigging offers typical turnbuckles with a selection of 3 different types of end fittings with each fitting having its own purpose, advantages, and disadvanatges.
Eye End Fittings
Eye end fittings are used with other components that can be opened and connect into the eye such as a shackle or quick link. They contain no moving parts and are the most cost-effective end fitting of the three.
Jaw End Fittings
Jaw end fittings are composed of a jaw, bolt, and nut. These are used to connect to other components that cannot be opened, such as an eyebolt or swaged sling eye.
Depending on size, some jaw turnbuckles only come with a pin and cotter.
You can find a list the of the components included with each jaw on our Turnbuckles page.
Hook End Fittings
Hook end fittings are used for temporary connections and are easily attached and detached from other rigging components.
Double check your fittings when using hook turnbuckles because the hooks are large and may not fit with other fittings having a similar working load limit.