ABSTRACT
Looking at the face of the thread (Fig. 10, right), the minor diameter is now shown in a full circle, whereas the major diameter is shown in a three-quarter circle with a thin line.
The thread tolerance symbol is composed of a number and a letter, e.g., 6g, 6H. The number indicates the tolerance range, and the letter, the tolerance position. In simpler terms, therletter indicates the starting point of the tolerance (see Fig. 11). In U.S. terminology this is referred to as the allowance.
