1、AECMA PREN2LC-03 77 W L01231L 0002328 O I DRAFT prEN2158-3 A.E,C.M.A. STANDARD NORME A.E.C.M.A. Edition 1 A.E.C.M.A. NORM January 1979 Approved by COMITE DE NORMALISATION of A.E.C.M.A. 1877-06-24 ENG L ISH VERSION The equivalent versions in be supplied by B.N.A.E., 8, rue Moreau-Vauthier 92100 BOULO
2、GNE*BILLANCOURf - FRANCE. MJ THREADS AEROSPACE SERIES PART 3 -TOLERANCES AND LIMITING DIMENSIONS FILETAGES MJ TOLERANCES ET DIMENSIONS LIMITES MJ-G EW I ND E PARTIE 3 - TEIL 3 - TOLERANZEN UND GRENZMASSE LUFT-UND RAUMFAHRT SERIE AEROSPATIALE The text of this standard, which exists in three equivalen
3、t versions (English, French, German) has been drawn up under the responsability of A ECMA (Assockttion Europenne des Constructeurs de Matriel Arospatial) and has been circulated to Official Services. Any reservations expressed by Official Services and not remlvA3 in this issue, have been incorporate
4、d in the history sheet which has accompanied this prEN,to CEN. It is publislied on yell0 w 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). I _. -_ _ AECMA PREN2158-03 79
5、10L2311 0002329 2 prEN2158-3 Page 2 FOREWORD This standard is part 3 of EN2158, defining metric J threads aerospace series. The complete series is made up as follows : EN2158-1 - MJ threads - Part 1 - Basic profile EN2158-2 - MJ threads - Part 2 - Selection of nominal diame- ters - Pitches - Toleran
6、ces EN2158-3 - FU threads - Part 3 - Tolerances and limiting dimens ions, CONTENTS 1 SCOPE AND FIELD OF APPLICATION 2 REFERENCES 3 PROVISION FOR COATED THREADS 4 LIMITING DIMENSIONS 5 DESIGNATION AECMA PREN2158-03 79 W LO12311 0002330 7 = prEN2158-3 Page 3 DRAFT EUROPEAN STANDARD AEROSPACE SERIES pr
7、EN2158-3 MJ THREADS PART 3 - TOLERANCES AND LIMITING DIMENSIONS I 1 SCOPE AND FIELD OF APPLICATION This standard specifies the tolerances and/or the limiting dimensions for MJ threads selected in EN2158-2 for aerospace construction. For threads of nominal diameter 1 and 1,2 mm, refer to ISO/R 1501.
8、2 REFERENCES ISO/R 1501 - 1970, IS0 miniature screw threads EN2158-1, MJ threads - Part 1 - Basic profile EN2158-2, MJ threads - Part 2 - Selection of nominal diameters - Pitches - Tolerances, 3 PROVISION FOR COATED THREADS The dimensions, prior to coating, shall be compatible with both : - the thic
9、kness of the coating adopted, - the limiting dimensions specified in this standard. The standardised tolerances for threads (grade/position) should be used whenever possible, to reduce the number of manufacturing and inspection tools. 4 LIMITING DIMENSIONS or c - 4.2 I1 4.1 Validity The limiting dim
10、ensions specified in tables 1 to 4 are for components ready for use (coated or uncoated). These dimensions are checked by means of a ring plug gauge having a thread length of : Id-D for nominal d-D 10 mm ustration Figures 1 and 2 show the position as well as the form of the actual profile (min, max)
11、 with respect to the basic profile. AECMA PREN2L5B-03 77 LOL231L 0002333 O W d min. TOI. 1,515 0,085 1,905 0,095 2,400 0,100 2,894 0,106 3.375 0,125 3,860 0,140 4,850 0,150 5,820 0,180 6,820 0,180 7820 0,180 9,788 0,212 11,788 0,212 13,764 0236 15,764 0,236 17,764 0,236 19,764 O236 2,764 0236 23,720
12、 0,sO 26,720 0,260 29,720 0,2260 32.720 0,280 35,720 0,280 38,720 0280 prEN2158-3 Page 4 4.3 External. thread max. 1,373 1,740 2,208 2,675 3,110 3545 4,480 5,350 6,350 7,350 9,188 11,188 13,026 15,026 17,026 19,026 21,026 22,701 25,701 28,701 31,701 34,701 37,701 Pitch k A 9- Thread MJ 1.60.35 - 4h6
13、h MJ 2 0.4 -4h6h MJ 250.45 - 4h6h MJ 2 0.5 -4h6h MJ 3.50.6 -4h6h MJ 4 xO, -4h6h MJ 5 0.8 -4h6h MJ 6 xl -4h6h MJ 7 xl -4h6h MJ 8 XI -4h6h MJ10 1,25*4h6h MJ12 125-4h6h MJ14 xi6 -4h6h MJ16 l,5 -4h6h MJ18 xl,5 -4h6h MJ20 13 -4h6h MJ22 XlB -4h6h MJ24 2 -4h6h MJ27 2 -4h6h MJ30 2 -4h6h MJ33 2 -4h6h MJ36 2
14、-4h6h MJ39 XZ -4h6h Basic prof ile 21-1 I V I max. 1,600 2,000 23CHl 3,000 3,500 4,000 5,000 6,000 7,000 8,000 10,ooO 12,000 14,000 16,000 18,000 20,oOO 22,WO 24,000 27,OW Xl,ooO 33,ooO 36,OOO 39,ooO c TOI. 0,040 0,042 0,045 0,048 0,053 0,056 0,060 0,07 1 0,07 1 0.07 1 0,075 0,085 0,090 0,090 0,090
15、0,090 0,090 0,106 0,106 0,106 0,106 0,106 0,106 i E c U max. 1,196 1,538 19so 2,423 2,807 3,192 4,076 4,845 51845 6845 8,557 10,557 12.268 14,268 16265 18,269 20333 21,691 24,691 27,691 30,691 33,691 36.691 Basic profile R min.=0,15011 pitch FIGURE 1 The blend between root diameter dg and the thread
16、 flanks is of rounded form. This blend consists of : - either a single radius “RI lying between 0,18042 x pitch and 0,15011 x pitch - or by 2 radiia0,15011 x pitch.and a flat Dimensions in millimetres TABLE 1 I d2 min. 1,333 1,698 2,163 2,627 3.m7 3,489 4,420 5379 6279 7 979 9,113 11,103 12,936 1493
17、6 16,936 18,936 20936 22,595 25,595 28,595 31,595 34,595 37,595 d3 min. 1,135 1,472 1,908 2,344 2.7 18 3,093 3,968 4,7 14 5.7 14 6.7 i4 8,406 10,396 12,087 14,087 16,087 18,087 20,087 21,463 2469 1 27,463 30,463 33,463 36,43 TOI. 0,061 0,066 0,072 0,079 0,089 0.099 0,108 0,131 0,131 0,131 0,151 0,16
18、1 0,181 0.181 0,181 0,181 0,181 0,228 0,228 0228 0,228 0,228 0228 AECMA PREN2158-03 79 m 1012311 0002332 2 m prEN2158-3 Page 5 TABLE 2 r Pitch 0 3 O,4 0 145 0s 0,6 0,7 0s 1 125 13 2 R max. min. - 0,063 0,053 0,072 0,060 0,081 0,068 0,090 0,075 0,126 0,105 0,180 0,150 0,226 0,188 0.271 0,225 0,361 0,
19、300 0,108 0,090 Oll 44 0,120 4.4 Internal thread FIGURE 2 The form of the blend between external diameter 11D311 and the thread flanks is arbitrary. In practice, however, the root is generally rounded outside the nominal diameter (d.D), without any specific value of the radius being required. AECMA
20、PREN2158-03 79 m 1012311 0002333 4 m grEN2158-3 Page 6 Thread MJ 1,6 x 0,35 - 4H6H MJ 2 xO, -4H6H MJ 2,5 x 0,45 - 4H6H MJ 3 xO, -4H6H MJ 3,50,6 -4H6H MJ 4 xO, -4H6H MJ 5 xO, -4H6H MJ 6 XI -4H5H MJ 7 XI -4H5H MJ 8. XI -4H5H MJ10 x 1,25 - 4H5H MJ12 x 1,25 - 4H5H MJ14 1,5 -4H5H MJ16 1,5 -4H5H MJ18 1,5
21、-4H5H MJ20 x 1,5 - 4H5H MJ22 x 1,5 -4H5H MJ24 2 -4H5H MJ27 2 -4H5H MJ30 2 -4H5H MJ33 2 -4H5H MJ36 2 -4H5H MJ39 2 -4H5H D, 1) rnax. 1,704 2,114 2,62 5 3,135 3,658 4,176 5,195 62% 7239 8,239 1 0,280 12,292 14,334 16,334 18,334 20,334 22,334 24,429 27,429 30,429 33,429 36,429 39,429 TABLE 3 min. 1,373
22、1,740 2,208 2,675 3,110 3345 4,480 5,350 6,350 7350 9,188 11,188 13,026 15,026 17,026 19,026 2 1,026 22,70 1 25,701 28,701 31 ,701 34,701 37 ,701 D2 max. 1,426 1,796 2,268 2,738 3,181 3,620 4,560 5,445 6,445 7,445 9,288 1 1.300 13,144 153 44 17,144 19,144 21,144 22,841 25,841 28,841 31,841 34,841 37
23、,841 TOI. O ,053 0,056 0,060 0,063 0,071 0,075 0,080 0,095 0,095 0,095 0,100 0,112 0,118 Oll 18 Oll 18 0,118 0,118 0,140 0,140 0,140 0,140 0.1 40 0,140 Dimensions in millimetres min. 1259 1,610 2,062 2,513 2,915 3,318 4,221 5,026 6,026 7 ,O2 6 8,7 82 10,782 12,539 14539 16,539 18,539 20339 22,051 25
24、,051 28,051 31,051 34,05 1 37 ,O5 1 D, max. 1,359 1,722 2,187 2,653 3,075 3,498 4,421 5.21 6 6,216 7,216 8,994 10,994 12,775 14,775 16,775 18,775 20,775 22,351 25,35 1 28,351 31,351 34,35 1 37,351 Toi. 0,100 0,112 0,125 0,140 0.1 60 0,180 o 200 0,190 0,190 0,190 0212 0,212 0236 0,236 0,236 0,236 0,2
25、36 0,300 O ,300 0,300 O ,300 O ,3O O ,300 1) D3 min is not specified, nevertheless it must be greater than the diameter D max. AECMA PREN2158-03 77 = 201231L 0002334 b m 4.5 4.6 Cumulta prEN2158-3 Page 7 ive tolerances Within the limits of the thread pitch diameter, the total errors embracing pitch,
26、 flank angle, helix, taper, circularity and all other errors affecting the form of the thread, shall not exceed 0,5 times the tolerance on the pitch diameter. Tolerances on pitch and flank angle In view of the requirements of clause 4.5, the values indicated in table 4 are provided for reference onl
27、y. TABLE 4 Dimensions in millimetres Dord 16 2 25 3 3 3 4 5 6-7 -8 10 12 6-18-2 - 22 4 - 27 - 30 - 33 - 36 - 3 14 - external thread t: Apm 9s 9 d 10,4 11,l 122 129 13,9 16,4 17,3 19,6 20 l8 24,5 1 45 137 132 128 121 113 19 1 5 055 1 2 055 049 interna I thread +Apm 122 129 13,9 16,4 17,3 184 21 9 23,
28、l 259 272 32,3 145 219 28 22 155 l“48 1 38 132 127 113 1022 l“12 1 O4 DESIGNATION The threads specified in this standard are designated by : - M : Code letter for metric threads - J : Code letter for the thread profile - Nominal diameter x Pitch : quoted in millimetres - Tolerance class of pitch diameter, as well as major diameter (for external threads) or minor diameter (for internal threads), this data being written in the following manner : Examples : - For a bolt : MJ6x1-4h6h - For a nut : MJ6x1-4H5H I
