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Drill rods for geological operations consist of one end threaded internally to form a pin, and the other end threaded externally to form a box. The 3.1m long rods are fit together to provide the length needed for drilling. Originally, these AISI 4130 steel drill rods were imported. It was then decided to manufacture these locally by threading rods imported from India. These rods began seizing prematurely in the field.</p>
