![]() Tolerance grade designation Metric threads The letter A signifies external threads, and the letter B signifies internal threads. UTS thread tolerance designation uses only two letters, A and B. Table 1: Examples of fundamental deviations for internal and external metric threads. Some examples of deviation amounts are seen in Table 1. Internal thread dimensions must always be greater than or equal to the basic profile.įigure 3: Metric external thread tolerance deviation positions h (zero deviation) and g-a (negative deviations). An external thread’s dimensions must always be equal to or smaller than the basic profile. As seen in Figure 3, h describes tolerance with zero deviation from the basic profile, and g-a describe tolerance with deviation below the basic profile, which is a theoretical thread profile. As seen in Figure 2, H describes tolerance with zero deviation from the basic profile, and G describes tolerance with deviation above the basic profile. Internal threads only use G and H, and external threads use a-h. The letters A-H are in the metric tolerance system. Tolerance letter designation Metric threads Order: Pitch diameter tolerance comes before major diameter tolerance.Numbers: Numbers indicate the tolerance grade.For a UTS screw thread, A indicates external, and B indicates internal. ![]() These letters also designate tolerance position.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |