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:

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 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