Knowing about THREADS: Do you have all the information required to make an knowledgeable purchase on the drilling rods, hammers and bits and knowing what to ask before ordering. Thread design and dimensions vary according to the application and standards. In the water well drilling they have adapted the American Petroleum Institute (A.P.I) standards which was developed for rotary drilling. There are two types of threads basically API regular and API Internal Flush (IF). The information on the identifying of the threads are given below:
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