ISO 3161 pdf download

ISO 3161 pdf download.Aerospace — UNJ threads — General requirements and limit dimensions 1 Scope This International Standard specifies the general requirements and limit dimensions of inch series UNJ threads with controlled root radius for aerospace construction. It determines the basic triangular profile for this type of thread and gives a system for designating the diameter and number of threads per inch combinations. For all diameters 0,060 in (1 ,524 mm) to 6,000 in (1 52,4 mm), it offers in the form of tables the basic dimensions and tolerances for a selection of diameter and number of threads per inch combinations. It also provides the method of calculation for the dimensions and tolerances for any diameter and number of threads per inch combination not given in the tables, including threads with a diameter in excess of 6,000 in. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1 5872:— 1 ? , Aerospace — UNJ threads — Gauging. 3 Term and definition For the purposes of this International Standard, the following term and definition apply. 3.1 basic profile in an axial plan, the theoretical profile corresponding to the basic dimensions See Figure 1. 4 Basic profile 4.1 Symbols See Figure 1 . 5.3 Number of threads perinch (n) 5.3.1 General Columns 3 to 9 (inclusive) of Table 3 give the numbers of threads per inch which are recommended to be associated with the diameters in columns 1 and 2. These columns of the numbers of threads per inch are divided into two groups: ? series with increasing (progressive) pitches: columns 3, 4 and 5; ? constant (uniform) pitch series: columns 6, 7, 8 and 9. 5.3.2 Series with increasing (progressive) pitches There are three series of increasing pitches. They are headed “Coarse pitch”, “Fine pitch” and “Extra fine pitch” in accordance with current practice. These terms indicate the relative pitches of the three series for each given thread diameter...