ASME B1.13M:2005 pdf download.Metric Screw Threads:M Profile.
5.7 Circular Runout
Circular runout is the lull indicator movement (FIM) (see ASME Y14.5). Runout of the crest (minor diameter of internal thread or major diameter of external thread) relative to the pitch cylinder shall not be so great that the basic profile is transgressed.
5.7.1 Internal Thread. When measurement is speci. fled, the runout of the minor diameter cylinder relative to the pitch cylinder on the internal thread shall not exceed the difference between the measured minor diameter and the basic minor diameter. An out-of-round pitch cylinder may reduce the available runout.
5.7.2 External Thread. When measurement is specified, the runout of the major diameter cylinder relative to the pitch cylinder on the external thread shall not exceed the difference between the measured major diameter and the basic major diameter. An out-of-round pitch cylinder may reduce the available runout.
5.8 Lead and Flank Angle Tolerances See section 10.
5.9 Coated or Plated Threads
See section 8 for dimensional accommodation and limits for coated threads.
6 DESIGN FORMULAS AND TABULATED VALUES FOR ALLOWANCES AND TOLERANCES
6.1 General
This section provides the formulas and tabulated values for ISO allowances and tolerances in accordance with ISo 965-1. It is to be used for size limit calculation for non-standard threads, when required. See para. 9.2 for applications and limitations of formulas and tables.
6.2 Rounding Procedure for Tabulated Values
(a) The values for crest and pitch diameter tolerances (Tables 9, 10, 11, and 12), for length of engagement (Table 7), and for allowances/fundamental deviations (Table 13) have been calculated from formulas and then rounded off to the nearest values in the R40 series of preferred numbers in accordance with ISO 3 for the three decimal places required. If a fourth decimal place results, it is further rounded.
Circular runout is the lull indicator movement (FIM) (see ASME Y14.5). Runout of the crest (minor diameter of internal thread or major diameter of external thread) relative to the pitch cylinder shall not be so great that the basic profile is transgressed.
5.7.1 Internal Thread. When measurement is speci. fled, the runout of the minor diameter cylinder relative to the pitch cylinder on the internal thread shall not exceed the difference between the measured minor diameter and the basic minor diameter. An out-of-round pitch cylinder may reduce the available runout.
5.7.2 External Thread. When measurement is specified, the runout of the major diameter cylinder relative to the pitch cylinder on the external thread shall not exceed the difference between the measured major diameter and the basic major diameter. An out-of-round pitch cylinder may reduce the available runout.
5.8 Lead and Flank Angle Tolerances See section 10.
5.9 Coated or Plated Threads
See section 8 for dimensional accommodation and limits for coated threads.
6 DESIGN FORMULAS AND TABULATED VALUES FOR ALLOWANCES AND TOLERANCES
6.1 General
This section provides the formulas and tabulated values for ISO allowances and tolerances in accordance with ISo 965-1. It is to be used for size limit calculation for non-standard threads, when required. See para. 9.2 for applications and limitations of formulas and tables.
6.2 Rounding Procedure for Tabulated Values
(a) The values for crest and pitch diameter tolerances (Tables 9, 10, 11, and 12), for length of engagement (Table 7), and for allowances/fundamental deviations (Table 13) have been calculated from formulas and then rounded off to the nearest values in the R40 series of preferred numbers in accordance with ISO 3 for the three decimal places required. If a fourth decimal place results, it is further rounded.
