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Turnbuckles are adjustable devices consisting of three primary components: a body, a right-hand threaded end fitting and a left-hand threaded end fitting. Turnbuckles have three types of end fittings (hook, eye, or jaw) and can come in combinations with different fittings on the ends of the same piece of hardware. Additionally, turnbuckles can be open-bodied or pipe-bodied, depending on the needs to do your job safely.

In order to prevent undue damage to the markings or the turnbuckles themselves, there are many steps to consider before using rigging hardware for overhead lifts.

As an end-user, you want to pay attention to the effects of the environment in which your rigging gear is used, including the following:

Temperature
Chemically Active Environments
Training
Storage and Work Environments
Temperature

When adjustable hardware, excluding swivel hoist rings and carbon steel eyebolts, is to be used at temperatures above 400°F (204°C) or below -40°F (-40°C), the hardware manufacturer or a qualified person should be consulted.

When carbon steel eyebolts are to be used at temperatures above 275°F (135°C) or below 30°F (-1°C), the hardware manufacturer or a qualified person should be consulted.

Chemically Active Environments
The strength of adjustable hardware can be affected by chemically active environments such as caustic or acidic substances or fumes. The adjustable hardware manufacturer or a qualified person should be consulted before use in chemically active environments.

Training
Adjustable hardware users shall be trained in the selection, inspection, cautions to personnel, effects of environment, and rigging practices.

Storage and Work Environments
Adjustable hardware should be stored in an area where it will not be subjected to damage, corrosive action, or extreme heat.

If extreme temperatures or chemically active environments are involved, the guidance provided in the above sections discussing temperature and chemically active environments shall be followed.