A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one screwed into each end of a small metal frame, one with a left-hand thread and the other with a right-hand thread.

        A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts, one screwed into each end of a small metal frame, one with a left-hand thread and the other with a right-hand thread.

A turnbuckle is a mechanical device used to adjust the tension in ropes, cables, tie rods and other tensioning systems. It is also known as a stretching screw or a bottle screw.

Turnbuckles are used in many industrial applications that require a large amount of tension. The tension can be in the range of 10 grams for thin cables used in garden fences to thousands of the kilograms to hold large structures used in buildings and bridges. Turnbuckles are almost always used in harsh environments and thus they need to be constructed of materials that can withstand the corrosive elements. This is one of the primary reasons that the manufacturing materials for turnbuckles should be corrosion-resistant. One material that shows such properties is high tensile strength stainless steel, which is used because it has properties of steel and is corrosion-resistant.

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