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Drill Rod

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A self-drilling drill bar is a hollow tube that is threaded along its length. This is done by cold rolling of a long tube. Drilling bars are used for post-tensioning and other geotechnical and engineering works. A drill rod is made of bar stock. It can be used to create tools such as drill bits and taps, dowel pins. It is soft enough to form but can be heated up to return to its original hardness. Drill rods are made from tool-steel that has been ground to an exact tolerance. They are often tempered prior to being machined to make the steel more machine-friendly. There are three types: water hard, oil hard and air hard drill rods.
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