Development of wireline drill rod threads — DrillSafe
2017-11-6u2002·u2002The original 'Q' series wireline drill rod designed by Boart Longyear in the 1950's was the only wireline drill rod available for nearly 3 decades. This thread has an efficiency of approximately 35% and so the depth capacity of the 'Q' series drill rods was therefore only 1 400 metres.
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