For 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.In most cases, the series will be UN C, UN F, or UN EF (Coarse, Fine, or Extra fine pitch).For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI). It is also allowed to denote the pitch by distance.For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″). By default, the pitch is given in TPI.
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