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Internal thread (or nut thread) is a term to describe all internal threads in ISO metric thread standards. Metric internal thread dimensions chart according to ASME B1.13M "Metric Screw Threads: M Profile" standard. Minor diameter, pitch diameter and major diameter Note 1: Dimension is used in the design of tools, etc. In dimensioning internal threads it is not normally specified. Supplements: Metric external thread dimensions are given in the external thread chart below according to ASME B1.13M standard. Thread pitch diameter, major diameter and minor diameter thread tolerance class (Ex: M6 x 1 - 5H6H). In internal thread tolerance class designation, the pitch diameter tolerance is followed by minor diameter tolerance. If the two class designations for the pitch diameter and
thread tolerance class (Ex: M6 x 1 - 4g6g). In tolerance class designation, the pitch diameter tolerance is followed by major diameter tolerance. If the two class designations for the pitch diameter and