Thread repair inserts are used to repair defective threads when the nominal diameter is obtained or to reinforce threads when the nominal diameter is obtained (thread armouring).
The following tools are required: Core hole twist drills, special taps, insertion tools and edge breakers. Thread inserts made of stainless steel ensure very good corrosion and heat resistance. The cross section is rhombic and the wire is rolled up into an elastic spring. At the lower end there is a driving pin. When the threaded insert is screwed in, the spring is slightly tensioned and holds the insert in the external thread. The threaded insert is therefore larger when screwed in than in its initial state. There are three sizes in total, each of which is aligned with the nominal dimension ( 1xd, 2xd and 3 x d).