10/4/2023 0 Comments Thread forming tap drill chartFor example: 3/4– 0.0625 P – 0.1875 L UNF denotes a 3/4″ UNF thread with 3 starts. For a multiple-start thread, the lead is also indicated. Number of Starts: By default, all threads have a single start.For a left-hand thread, add the suffix -LH. Direction: By default, the thread is right-hand.For a detailed explanation of classes, read the dedicated section below. ![]() 1=Tight fit, 2=Medium fit, and 3=Loose fit. The first character is a digit between 1 and 3.The class is defined by a two-character code.The pitch remains the same for the whole diameter range in these series. ASTM B1.1, also defines several constant pitch series. ![]()
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