Thread inspection is used to check the condition, wear and damage of threads on bolts, pipes and components to ensure correct joining and load transfer.
Thread inspection is a control method where threads are inspected visually and mechanically using thread gauges, plugs, rings or special tools. The method is used to detect damages such as wear, deformation, corrosion, galling and incorrect geometry. Thread inspection is especially important in applications where threaded connections are critical for safety, tightness and functionality.
How the method works
The threads are cleaned and checked using calibrated thread gauges. The inspection can be supplemented with visual testing and other NDT methods if needed. The results are evaluated against applicable standards and acceptance criteria.
Typical applications
- Bolt and nuts
- Pipes and pipe couplings
- Flanges and pressure equipment
- Lifting equipment and critical connections
The method is particularly well suited to detect wear, deformations, damaged thread profiles and corrosion that may affect load-bearing capacity and function.
Advantages
- Simple and effective inspection tool
- Detects wear and damage early
- Contributes to increased safety and operational reliability
- Can be combined with visual testing and NDT