(0.1875/0.0625=3) Designation Examples of Acme Threads For example, 1/4– 0.0625 P – 0.1875 L-ACMEdenotes an 0.25″ ACME thread with 3 starts. For a multiple-start thread, the lead is also indicated by the letter L. 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.You cannot tell from the description alone if the thread is external or internal. Internal and external destination is exactly the same. The class is defined by a number between 2 and 4.This class defines a more restricted clearance at the major diameter of both the internal and external screws that prevent wedging on the flanks. For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI). On multiple starts threads (see below), the pitch is indicated 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.It is also allowed to denote the diameters with a decimal value.The diameter can range between 1/4″ to 5″.
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