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1、A Reference number ISO 5855-1:1999(E) INTERNATIONAL STANDARD ISO 5855-1 Third edition 1999-10-15 Aerospace MJ threads Part 1: General requirements Aronautique et espace Filetage MJ Partie 1: Exigences gnrales ISO 5855-1:1999(E) ISO 1999 All rights reserved. Unless otherwise specified, no part of thi
2、s publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch Pri
3、nted in Switzerland ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in
4、a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commissi
5、on (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an I
6、nternational Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 5855-1 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. This third edition cancels and replaces the secon
7、d edition (ISO 5855-1:1988), of which it constitutes a technical revision. ISO 5855 consists of the following parts, under the general title Aerospace MJ threads: Part 1: General requirements Part 2: Limit dimensions for bolts and nuts Part 3: Limit dimensions for fittings for fluid systems -,-,- IN
8、TERNATIONAL STANDARD ISOISO 5855-1:1999(E) 1 Aerospace MJ threads Part 1: General requirements 1 Scope This part of ISO 5855 specifies the general requirements for MJ threads used in aerospace construction. It determines the basic triangular profile for this type of thread and gives a system for des
9、ignating the diameter and pitch combinations. For all diameters 1,6 mm to 300 mm, it offers in the form of tables the basic dimensions and tolerances for a selection of diameter and pitch combinations. It also provides the method of calculation for the dimensions and tolerances for any diameter and
10、pitch combination not given in the tables, including threads with a diameter in excess of 300 mm. For limit dimensions for bolts and nuts of nominal diameter 1,6 mm to 39 mm, see ISO 5855-2. For limit dimensions for fittings for fluid systems, see ISO 5855-3. 2 Normative reference The following norm
11、ative document contains provisions which, through reference in this text, constitute provisions of this part of ISO 5855. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 5855 are encoura
12、ged 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 965-1:
13、1998, ISO general-purpose metric screw threads Tolerances Part 1: Principles and basic data. 3 Term and definition For the purpose of this part of ISO 5855, the following term and definition apply. 3.1 basic profile theoretical profile, in an axial plane, corresponding to the basic dimensions (witho
14、ut tolerances) of the thread, i.e. major diameter, pitch diameter and minor diameter See Figure 1. 4 Basic profile 4.1 Symbols See Figure 1. -,-,- ISO 5855-1:1999(E) ISO 2 4.2 Dimensions See Figure 1 and Table 1. Basic deviations shall be applied to the basic dimensions. where Dis the basic major di
15、ameter of internal thread D2is the basic pitch diameter of internal thread D1is the basic minor diameter of internal thread dis the basic major diameter of external thread d2is the basic pitch diameter of external thread d1is the basic minor diameter of external thread His the height of fundamental
16、triangle Pis the pitch a Axis of thread Figure 1 Basic profile -,-,- ISOISO 5855-1:1999(E) 3 Table 1 Dimensions -,-,- ISO 5855-1:1999(E) ISO 4 5 Position and form of limit profiles 5.1 External threads The actual thread profile is located between the limit profiles shown in Figures 2 and 3. Within t
17、hese limits, any continuous, non-reversing curve is permitted, provided that it comprises radii no less than 0,150 11P. a Pitch P b Basic and maximum profiles c Basic profile d Minimum profile Figure 2 Limit profiles for external threads (clearance may be nil) -,-,- ISOISO 5855-1:1999(E) 5 a Pitch P
18、 b Basic profile c Maximum profile d Minimum profile Figure 3 Limit profiles for external threads (systematic clearance) 5.2 Internal threads The actual thread profile is located between the limit profiles shown in Figures 4 and 5. The form of the connection between the root (corresponding to diamet
19、er D3) and the thread flanks is not mandatory. The root is generally rounded beyond the nominal diameter. The radius is not specified. -,-,- ISO 5855-1:1999(E) ISO 6 a Pitch P b Basic profile c Maximum profile d Basic and minimum profiles Figure 4 Limit profiles for internal threads (clearance may b
20、e nil) a Pitch P b Maximum profile c Minimum profile d Basic profile Figure 5 Limit profiles for internal threads (systematic clearance) -,-,- ISOISO 5855-1:1999(E) 7 6 Tolerances 6.1 Tolerances on diameters The grades, positions and basic upper and lower (es and EI) tolerance deviations (see Figure
21、s 3 and 5) shall be as specified in ISO 965-1. 6.2 Tolerances on other parameters Tolerances on pitch P and on the half flank angle shall be determined from the formulae given in clause 10. Within the limits of the thread pitch diameter, and over the chosen length of measurement, the sum of the effe
22、cts of variations in the pitch, flank angle, helix, taper and circularity and all other variations affecting the form of the thread shall not exceed 0,5 times the tolerance on the pitch diameter. The following information is therefore given for information only. The thread pitch may vary by P from t
23、he basic profile, but the total variation between any two threads located within the length of engagement should not exceed P. 6.3 Provisions for coated threads In order to reduce the number of manufacturing and inspection tools, it is recommended that, where possible, standardized tolerance classes
24、 for threads (grade and position) as specified in ISO 965-1 be used. 7 Limit dimensions The limit dimensions, shown in Figures 2 to 5, shall be determined from the formulae given in clause 10. 8 Nominal diameter and pitch combinations The threads in 5.1 and 5.2 and indicated in Table 2 meet most req
25、uirements. If other diameter and pitch combinations or threads larger than 300 mm in diameter are required, then these shall be calculated using the formulae in clause 10. 9 Designation 9.1 General The threads specified in this part of ISO 5855 are designated by: M, a letter identifying metric threa
26、ds; J, a letter symbolizing the thread profile; the nominal diameter pitch, expressed in millimetres; the tolerance class on pitch diameter, followed by the tolerance class on the major diameter or on the minor diameter1). 1) If a single tolerance class is given, it refers to the pitch diameter d2 o
27、r D2 and the major diameter d or minor diameter D 1. -,-,- ISO 5855-1:1999(E) ISO 8 EXAMPLE 1 An external MJ thread, of nominal diameter 6 mm, pitch 1 mm and tolerance classes 4h6h is designated as follows: MJ6 1-4h6h EXAMPLE 2An internal MJ thread, of nominal diameter 6 mm, pitch 1 mm and tolerance
28、 classes 4H5H is designated as follows: MJ6 1-4H5H 9.2 Special cases MJ threads not specified in this part of ISO 5855 are special threads. They shall be calculated in accordance with clause 10 and designated by MJ, see 9.1; S, a letter symbolizing a special thread; all the information necessary to
29、produce the thread. EXAMPLE 1An external MJ thread, of nominal diameter 13 mm, pitch 1 mm and tolerance class 4h2) is designated as follows: MJS13 1-4h 13 Major diameter d =12,888 mm 12,350 Pitch diameter d2 =12,275 mm 11,845 Minor diameter d3 =11,709 mm 0,18 Root radius =0,15 mm EXAMPLE 2 An intern
30、al MJ thread of nominal diameter 13 mm, pitch 1 mm and tolerance class 4H5H, is designated as follows: MJS13 1-4H5H Major diameter D3 max. =13,244 mm 12,450 Pitch diameter D2 =12,350 mm 12,216 Minor diameter D1 =12,026 mm 2) If a single tolerance class is given, it refers to the pitch diameter d2 or
31、 D2 and the major diameter d or minor diameter D 1. -,-,- ISOISO 5855-1:1999(E) 9 9.3 Left-hand threads In the case of left-hand threads, the designation given in 9.1 and 9.2 is followed by the letters LH (Left-Hand). 9.3.1 General EXAMPLE 1 MJ6 1-4h6h-LH EXAMPLE 2 MJ6 1-4H5H-LH 9.3.2 Special cases
32、EXAMPLE 1 MJS13 1-4h-LH EXAMPLE 2 MJS13 1-4H5H-LH 10 Calculation formulae 10.1 External threads (see Figures 2 and 3) d max. = d es es: in accordance with ISO 965-1 d min. = d max. Td Td: in accordance with ISO 965-1 or as defined by part designer d2 max. = d2 = d max. 0,649 519P 0,649 519P: see Tab
33、le 1. d2 min. = d2 max. Td2 Td2: in accordance with ISO 965-1 or as defined by part designer d3 max. = d3 = d2 max. 0,505 18P 0,505 18P: see Table 1. d3 min. = d2 min. 0,565 80P 0,565 80P: see Table 1. P = 0,4 Td2/1,732 1 is such that tan () = 0,3 Td2/1,125P Tables 3 and 4 give information for the l
34、imit dimensions for respectively 4h6h and 4g6g external threads. Table 5 gives information for the root radii for external threads. Table 6 gives information for the maximum permissible deviations on pitch (lead) and on half flank angle. -,-,- ISO 5855-1:1999(E) ISO 10 10.2 Internal threads (see Fig
35、ures 4 and 5) D1 min. = D 0,974 28P + EI 0,974 28P: see Table 1. EI: in accordance with ISO 965-1 D1 max. = D1 min. + TD1 TD1: in accordance with ISO 965-1 or as defined by part designer D2 min. = D2 = D 0,649 519P + EI 0,649 519P: see Table 1. D2 max. = D2 min. + TD2 TD2: in accordance with ISO 965
36、-1 or as defined by part designer D3 max. = D2 max. + 0,793 86P 0,793 86P: see Table 1. P = 0,4TD2/1,732 1 is such that tan () = 0,3TD2/1,125P Table 7 gives information for the limit dimensions for internal threads. Table 6 gives information for the maximum permissible deviations on pitch (lead) and
37、 on half flank angle. -,-,- ISOISO 5855-1:1999(E) 11 Table 2 Nominal diameter and pitch combinations Dimensions in millimetres D PD PD PD PD PD PD P 1,6 0,3517 139 262 285 3140 6220 3 1,8 0,3517 1,539 362 385 4145 2220 4 2 0,418 139 462 485 6145 3220 6 2,2 0,4518 1,540 1,564 1,588 1,5145 4225 3 2,5
38、0,3518 240 264 290 1,5145 6225 4 2,5 0,4518 2,540 364 390 2150 2225 6 3 0,3520 142 1,564 490 3150 3230 3 3 0,520 1,542 264 690 4150 4230 4 3,5 0,3520 242 365 1,590 6150 6230 6 3,5 0,620 2,542 465 295 2155 3235 3 4 0,522 142 4,565 395 3155 4235 4 4 0,722 1,545 1,565 495 4155 6235 6 4,5 0,522 245 268
39、1,595 6160 3240 3 4,5 0,7522 2,545 368 2100 2160 4240 4 5 0,524 145 468 3100 3160 6240 6 5 0,824 1,545 4,568 4100 4165 3245 3 5,5 0,524 248 1,568 6100 6165 4245 4 6 0,7524 348 270 1,5105 2165 6245 6 6 125 148 370 2105 3170 3250 3 7 0,7525 1,548 470 3105 4170 4250 4 7 125 248 570 4105 6170 6250 6 8 0
40、,7526 1,550 1,570 6110 2175 3255 4 8 127 150 272 1,5110 3175 4255 6 8 1,2527 1,550 372 2110 4175 6260 4 9 0,7527 252 1,572 3110 6180 3260 6 9 127 352 272 4115 2180 4265 4 9 1,2528 152 372 6115 3180 6265 6 10 0,7528 1,552 475 1,5115 4185 3270 4 10 128 252 575 2115 6185 4270 6 10 1,2530 155 1,575 3120
41、 2185 6275 4 10 1,530 1,555 275 4120 3190 3275 6 11 0,7530 255 376 1,5120 4190 4280 4 11 130 355 476 3120 6190 6280 6 11 1,2530 3,556 1,576 4125 2195 3285 4 11 1,532 1,556 276 6125 3195 4285 6 12 132 256 378 1,5125 4195 6290 4 12 1,2533 1,556 478 2125 6200 3290 6 12 1,533 256 5,578 3130 2200 4295 4
42、12 1,7533 358 1,580 1,5130 3200 6295 6 14 133 3,558 280 2130 4205 3300 4 14 1,2535 1,558 380 3130 6205 4300 6 14 1,535 258 480 4135 2205 6 14 236 1,560 1,580 6135 3210 3 15 136 260 282 1,5135 4210 4 15 1,536 360 382 2135 6210 6 16 136 460 482 3140 2215 3 16 1,538 1,560 5,585 1,5140 3215 4 16 239 1,5
43、62 1,585 2140 4215 6 -,-,- ISO 5855-1:1999(E) ISO 12 Table 3 Limit dimensions for 4h6h external threads Dimensions in millimetres Major diameter d Pitch diameter d2 Minor diameter d3 Thread designationTdTd2Td3 max.min.(6h) amax.min.(4h) amax.min. MJ1,6 0,35-4h6h1,6001,5150,0851,3731,3330,041,1961,13
44、50,061 MJ1,8 0,35-4h6h1,8001,7150,0851,5731,5330,041,3961,3350,061 MJ2 0,4-4h6h2,0001,9050,0951,7401,6980,0421,5381,4720,066 MJ2,2 0,45-4h6h2,22,10,11,9081,8630,0451,6801,6080,072 MJ2,5 0,35-4h6h2,5002,4150,0852,2732,2330,042,0962,0350,061 MJ2,5 0,45-4h6h2,52,40,12,2082,1630,0451,9801,9080,072 MJ3 0
45、,35-4h6h3,0002,9150,0852,7732,7310,0422,5962,5330,063 MJ3 0,5-4h6h3,0002,8940,1062,6752,6270,0482,4232,3450,078 MJ3,5 0,35-4h6h3,5003,4150,0853,2733,2310,0423,0963,0330,063 MJ3,5 0,6-4h6h3,5003,3750,1253,1103,0570,0532,8072,7180,089 MJ4 0,5-4h6h4,0003,8940,1063,6753,6270,0483,4233,3440,078 MJ4 0,7-4h6h4,003,860,143,5453,4890,0563,1923,0940,098 MJ4,5 0,5-4h6h4,5004,3940,1064,1754,1270,0483,9233,8440,078 MJ4,5 0,75-4h6h4,504,360,144,0133,9570,0563,6343,5330,101 MJ5 0,5-4h6h5,0004,8940,1064,6754,6270,0484,4234,3440,078 MJ5 0,8-4h6h5,004,850,154,484,420,064