Thread repair inserts are used to repair or to reinforce a thread while maintaining the initial diameter. The following tools are required: twist drill, screw tap, installation handle and break tool. Thread inserts which are made from stainless steel have a very high corrosion and heat resistance. The profile is rhomboid. The wire is rolled to an elastic spring. A lag pin is located at the bottom end. While installing the screw insert the spring gets tension and holds the inserts into the external thread. Therefore the thread insert is longer when installed than in the original state. There are different sizes which are oriented to the thread diameter (1 x d, 1,5 x d, 2,5 x d).
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