1、AECMA PREN2358-01 77 = LO1231L 0002323 8 P Approved by COMITE DE NORMALISATION of A.E.C.M.A. 1977.06-24 A.E ,C .M .A. STAN DAR D NORME A.E.C.M.A. A.E.C.M.A. NORM The equivalent versions in be supplied by B.N.A.E., 8, rua Moreau-Vauthier 92100 BOULOGNE-BILLANCOURT - FRANCE. DRAFT prEN2158-1 Edition 1
2、 Januar/ 1979 ENGLISH VERSION MJ THREADS AEROSPACE SERIES PART 1 - BASIC PROFILE FILETAGES MJ PARTIE 1 - PROFIL DE BASE SER I E AERO SPAT I A LE MJ-GEWI NDE TEIL 1 - GRUNDPROFIL LU FT-UND RAUMFAHRT The text of this standad, which exists in three equivalent versions (English, French, German) has been
3、 drawn up under the responsability of A ECMA (Association Europenne des Constructeurs de Matriel Arospatial) and has been circulated to Official Services Any reservations expressed by Official Services and not resolved in this issue, have been incorporated in the history sheet which has accompanied
4、this prEN to CEN. It ispublished on yellow paper as a draft European Standard intended to receive, under the same presentation and according to its own rules, the approval of CEN (European Committee for Standardization). AECMA PREN2L5-OL 77 = LOL23LL 0002322 T prEN2158-1 Page 2 FOREWORD This standar
5、d is part aerospace series, of EN2 defining metric threads, The complete series is made up as f0110WS : EN2158-1 - MJ threads - Part 1 - Basic profile EN2158-2 - MJ threads - Part 2 - Selection of nominal diame- ters - Pitches - Tolerances 111) EN2158-3 - MJ threads - Part 3 - Tolerances and limitin
6、g dimensions. The basic profile of the MJ thread differs from that of the IS0 metric thread (IS0 68) solely by the increase of the truncation on the minor diameter of the internal thread (0,3125 H instead of 0,2500 HI. This increase results from adoption of a maximum radius of 0,18042 pitch on the m
7、inor diameter d3 of the external thread (see EN2158-3). CONTENTS 1 SCOPE AND FIELD OF APPLICATION 2 REFFXENCES 3 DEFINITIONS 4 BASIC PROFILE DIMENSIONS prEN2158-1 Page 3 DRAFT EUROPEAN STANDARD AEROSPACE SERI ES prEN2158-1 MJ THREADS PART 1 - BASIC PROFILE 1 SCOPE AND FIELD OF APPLICATION This stand
8、ard defines the basic profile for MJ threads. This profile is applicable to all components used in aerospace construction, should conform to ISO/R 1501. with the exception of threads with a nominal diameter of 1 and 1,2 mm which 2 REFERENCES ISO/R 1501 - 1970,-IS0 miniature screw threads EN2158-2, M
9、3 threads - Part 2 - Selection of nominal diameters - Pitches - EN2158-3, Tolerances MJ threads - Part 3 - Tolerances and limiting dimensions 3 DEFINITIONS The basic profile (see figure i) is the theoretical profile corresponding to the basic thread dimensions (without tolerances) : major diameter,
10、pitch diameter and minor diameter. Deviations are applied to the basic dimensions. v t v I 1 AECMA PREN215-O1 79 W 1012311 0002324 3 ppEN2158-1 Page 4 I C P U n a Thread axis - O FIGURE 1 - Basicprofile U O 3125 P D D, Dl d d, d, H : Height of basictriangle. P : Pitch. : Basic major diameter for int
11、ernal thread. : Basic pitch diameter for internal thread. : Basic minor diameter for internal thread. : Basic major diameter for external thread. : Basic pitch diameter for external thread. : Basic minor diameter for external thread. 4 BASIC PROFILE DIMENSIONS The basic profile dimensions are given
12、in table P 0,125P 0,04375 O ,05000 0,05625 0,06250 0,07500 0,08750 0,10000 0,12500 0,15625 Oll 8750 0,25000 TABLE 1 Dimensions in millimetres H 1 0,8660254038P 0,10938 O, 12500 0,14062 0,15625 0,18750 0,2 1875 0,25000 O ,3 1250 0,39062 0,46875 0,62500 0,3031 1 0,34641 0,38971 O ,4330 1 0,51962 0,606
13、22 0,69282 0,86603 1,08253 1,29904 1,73205 0,125H 0,108258 O ,03789 0,04330 0,04871 0,05413 O ,06495 0,07578 0,08660 0,10825 0,13532 0,16238 0,21651 0,3125H 0,27063P 0,09472 0,10825 0,12178 Oll 3532 0,16238 O ,I 8944 0,21651 0,27063 0,33829 0,40595 O ,54 12 7 0,375H 0,32476P 0,11367 O, 12990 0,1461 4 0,16238 O, 19486 0,22733 0,25981 0,32476 0,40595 0,48714 0,64952 0,5625H 0,487 14P 0,17050 0,19486 0,21921 0,24357 0,29228 0,34100 O ,3897 1 0,48714 0,60892 0,7307 1 0,97428 -. - I
