General Note: All dimensions are in millimeters. They are used to form pressure-tight joints when assembled with an NPT external taper thread. threads with the same thread form as NPT. Machining Calculators Raw Materials Carbide Grades Machining Charts Glossary. After all, the threads will be identical in gage and will accommodate the type and size of external fastener threads. Metric External Thread Chart: Metric External Thread Chart - Limiting Dimensions for M Profile Tap Drill Sizes Charts GLOSSARY G-CODES Main Menu. Major diameter are same, it is not necessary to repeat the symbols. If the two class designations for the pitch diameter and Hardware High Precision Metric HSS M12 Roll Forming Tap STI Roll Tap Drill Sizes, STI Tap Drill Sizes, and Pipe Tap Drill Calculator - GUHRING TTap Drill. The major diameter still extends to within 1/8H. In tolerance class designation, the pitch diameter tolerance is followed by major diameter tolerance. The thread form is slightly modified to increase the minor diameter, and thus the strength of screws and taps. Thread tolerance class (Ex: M6 x 1 - 4g6g). The thread symbol, the nominal size, the pitch, and the for a no-allowance fit at maximum material, suchĮxternal thread tolerance classes 6g and 4g6g apply priorĪllowance may thus be used to accommodate the coating thickness on coated parts. If accuracy is critical, base your final decisions on the data provided in the root document. The intention is to provide accurate information regardless errors may exist in the supplied information. This data is provided for general information only. for tighter tolerance - tolerance class 4g6g METRIC THREAD - FINE PITCH - M (30 mm - 64 mm) Male Thd. for normal tolerance - tolerance class 6g With threads that are based on ISO 68-1 basic profile and Threads produced to ASME B1.13M standard are fully interchangeable Thread pitch diameter, major diameter and minor diameterįor M profile external threads are given. Metric external thread dimensions are given in the external thread chart below according to ASME B1.13M standard.
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