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Recent content by DS1Guru

  1. DS1Guru

    API 7: IF vs. REG vs. FH Threads

    Cnuk: Generally you will not find anyone cutting actual IF connections any longer. The IF threadform was replaced by API in 1968 with the NC threadform. The real IF threadform has a a V065 0.015 inch thread radius and was very prone to fatigue failures. The NC connections have a V038R thread...
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