![]() ![]() the metric thread/form identifier (M or MJ), the nominal diameter in millimeters, a lowercase “x,” the pitch in millimeters or for multiple start threads, L (lead in millimeters), P (pitch in millimeters), and number of starts in parcnthesesj, pitch diameter tolerance symbol, crest diameter tolerance symbol (if different from that of the pitch diameter), and any qualifying information. ![]() An alternate designation method for multiple start threads retains the number of threads (pitches) per inch and adds lead in inches (L) and number of starts in parentheses following it.įor 60 deg metric threads, the thread designation should include in sequence. For multiple start threads, replace the number of threads per inch with pitch in inches (P), lead in inches (L), and the number of starts in parentheses. ![]() ASME Y14.6-2001 pdf download – SCREW TEREAD REPRESENYATION.ģ.2.1 On drawings with threaded parts, for standard series screw threads, the designation of the screw thread is noted and optionally supplemented by the pitch diameter and its tolerance, or pitch diameter limits.ģ.2.1.1 For 60 deg inch threads, the thread designation should include, in sequence, the nominal diamctcr in inches, the number of threads pcr inch, the lettcr symbol of the thread series, the number and letter of the thread class, and any qualifying information. ![]()
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