1、BSI Standards PublicationBS ISO 10959:2016Aerospace MJ threads GaugingBS ISO 10959:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 10959:2016.It supersedes BS ISO 10959:2000 which is withdrawn.The UK participation in its preparation was entrusted to Techni
2、calCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. Th
3、e British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 86451 3ICS 49.030.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 M
4、arch 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 10959:2016 ISO 2016Aerospace MJ threads GaugingAronautique et espace Filetage MJ Vrification par calibresINTERNATIONAL STANDARDISO10959Second edition2016-03-01Reference numberISO 10959:2016(E)BS ISO 10959:2016
5、ISO 10959:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photoco
6、pying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 0
7、1 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 10959:2016ISO 10959:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Types of gauges 24.1 Gauges and setting plugs for external product threads . 24.2 Gauges for internal product threads 25 Refer
8、ence temperature 26 Function, design, and use of gauges 36.1 Gauges for external threads . 36.1.1 Virtual pitch diameter indicating thread gauges . 36.1.2 Solid or adjustable GO screw ring gauges 36.1.3 Simple pitch diameter indicating thread gauges 36.1.4 Major diameter gauges . 46.1.5 Minor diamet
9、er gauges. 46.1.6 Optical comparator checks 46.2 Gauging for internal threads . 46.2.1 GO screw plug gauges 46.2.2 NOT GO screw plug gauges . 46.2.3 Minor diameter gauges. 46.2.4 Virtual pitch diameter indicating thread gauges . 46.2.5 Simple pitch diameter indicating thread gauges 57 Setting gauges
10、 58 Gauging of threads 5Annex A (normative) Prevalence of gauging by GO gauges .19Bibliography .20 ISO 2016 All rights reserved iiiContents PageBS ISO 10959:2016ISO 10959:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (I
11、SO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, gov
12、ernmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further mainte
13、nance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attent
14、ion is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction
15、and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity
16、 assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace faste
17、ner systems.This second edition cancels and replaces the first edition (ISO 10959:2000), which has been technically revised.iv ISO 2016 All rights reservedBS ISO 10959:2016ISO 10959:2016(E)IntroductionThe purpose of this International Standard, which differs from ISO 1502, is to take into account th
18、e basic characteristics of the ISO MJ threads (restricted form variation and increased root radius of the external thread) as well as the specific tolerances and to standardize the gauging principles for ISO MJ threads, intended for products for aerospace applications. ISO 2016 All rights reserved v
19、BS ISO 10959:2016BS ISO 10959:2016Aerospace MJ threads Gauging1 ScopeThis International Standard contains information for the gauging of ISO MJ threads in accordance with ISO 5855-1, ISO 5855-2, and ISO 5855-3.Other methods of ensuring that the product is within the specified limits may be used prov
20、ided correlation with the specified gauges is established see 8.2, e).2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated reference
21、s, the latest edition of the referenced document (including any amendments) applies.ISO 1, Geometrical Product Specifications (GPS) Standard reference temperature for geometrical product specification and verificationISO 1502:1996, ISO general-purpose metric screw threads Gauges and gaugingISO 5408,
22、 Screw threads VocabularyISO 5855-1, Aerospace MJ threads Part 1: General requirementsISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nutsISO 5855-3, Aerospace MJ threads Part 3: Limit dimensions for fittings for fluid systems3 Terms and definitionsFor the purposes of this do
23、cument, the terms and definitions given in ISO 5408 and the following apply.3.1best wire sizecylinder or sphere which has a radius so that it will contact the thread flanks at the pitch cylinder intersectionNote 1 to entry: The radius of the best wire or sphere is theoretically equal to 0,288 68 P.3
24、.2indicating gaugedevice having contacts which will precisely compare the size of a work piece thread to a setting standard of known dimensionsNote 1 to entry: The value for the indicated characteristic thus established is the dimensional value attributed to the work piece. An indicating gauge may h
25、ave contacts designed to measure any thread characteristic. This International Standard specifies the characteristics and designs for ISO MJ threads.3.3simple pitch diameterdiameter of an imaginary cylinder intersecting an actual thread over the width of one groove where that width is equal to one h
26、alf of the basic pitchINTERNATIONAL STANDARD ISO 10959:2016(E) ISO 2016 All rights reserved 1BS ISO 10959:2016ISO 10959:2016(E)3.4virtual pitch diameterpitch diameter of the smallest (for external threads) or largest (for internal threads) perfect thread form with GO gauge profile which can engage t
27、he product threads for a distance equal to the GO gauge thread engagement4 Types of gauges4.1 Gauges and setting plugs for external product threadsGauge type Referencea) GO screw ring gauges 6.1.2b) Setting plug for adjustable GO screw ring and indicating thread gauges 7.1c) Virtual pitch diameter i
28、ndicating thread gauges 6.1.1d) Simple pitch diameter indicating thread gauges 6.1.3e) Flat contact gauges for major diameter 6.1.4f) Point contact indicating thread gauges for minor diameter 6.1.5g) Optical comparator for root radius and minor diameter 6.1.64.2 Gauges for internal product threadsGa
29、uge type Referencea) GO screw plug gauges 6.2.1b) NOT GO screw plug gauges 6.2.2c) Plain gauges for minor diameter (plug gauge) 6.2.3d) GO full form screw plug gauges 6.2.3.2e) Virtual pitch diameter indicating thread gauges 6.2.4f) Simple pitch diameter indicating thread gauges 6.2.55 Reference tem
30、peratureIn accordance with ISO 1, the dimensions of the gauge and the product shall be checked at the temperature of 20 C.If the product and the gauge have the same coefficients of linear expansion, the temperature may deviate from 20 C, provided the temperature of the product and the gauge are the
31、same.If the product and the gauge have different coefficients of linear expansion, the temperature of both, at the time of gauging, shall bea) 20 C 2 C for sizes MJ24 and smaller, andb) 20 C 1 C for larger threads.2 ISO 2016 All rights reservedBS ISO 10959:2016ISO 10959:2016(E)6 Function, design, an
32、d use of gauges6.1 Gauges for external threads6.1.1 Virtual pitch diameter indicating thread gauges6.1.1.1 It measures, on two or three segments or rolls, the maximum material virtual pitch diameter, taking into account variations of form such as pitch variation, helix and flank variations, roundnes
33、s, and taper which produces an enlargement of the virtual pitch diameter. In addition, virtual pitch diameter control ensures the flank angle contact is sufficient to ensure that the root radius does not exceed the maximum limit. Measurement of virtual pitch diameter with indicating gauges shall be
34、obtained to calculate virtual-minus-simple pitch-diameter differential unless the simple pitch diameter limits, gauged in accordance with the measurements given in 6.1.3, are within the limits defined by the maximum pitch diameter and the form variation limits in ISO 5855-1.6.1.1.2 Indicating gauges
35、 have two or three contacts at 180 or 120 respectively. Gauges with segments or rolls are designed with the length of the GO virtual maximum material gauging elements equal to the GO ring gauge length (see Table 1). For configuration and profile requirements, see Figure 1.6.1.1.3 The minor diameter
36、of the GO virtual maximum material thread segments and the diameter of the circle surrounded by the roll cluster of GO virtual maximum material rolls shall be equal to the pitch diameter of the product minus 0,375 H, less the TPL, minus tolerance when assembled in the gauge frame, where TPLis specif
37、ied in ISO 1502. This corresponds to a flat width of 0,312 5 P on the minor crest for the thread. The crest shall be flat in an axial plane and parallel to the axis of the segments or rolls.6.1.1.4 The major diameter of the GO virtual maximum material segments and the root of the GO virtual maximum
38、material rolls shall be cleared beyond a 0,125 P flat, either by an extension of the flanks of the thread toward a sharp vee or by an undercut no greater than 0,125 P maximum width and approximately central. The root clearance shall be such that the major diameter of the full form section of the thr
39、ead setting plug gauge is cleared after the assembled gauge has been properly set to size. Optional clearance specifications given in ISO 1502 may be used.6.1.1.5 The simple pitch diameter cylinder axis of threaded segments and rolls shall be straight within the diameter tolerance zone equal to TPLa
40、s specified in ISO 1502. The segment or roll thread profile, lead, pitch, and the half-angle variations shall be within the limits specified in ISO 1502.6.1.2 Solid or adjustable GO screw ring gaugesTo ensure the ease of assembly of product threads and conformance to the maximum material virtual pit
41、ch diameter limits, GO screw ring gauges with thread form as shown in Figure 1 and setting gauges in accordance with the details described in 6.1 may be used. Solid GO screw ring gauges shall not be permitted to exceed the product thread dimensional limits. The gauge thickness/length shall be standa
42、rdized as shown in Table 1. The gauge tolerances, WGO, shall be in accordance with ISO 1502.6.1.3 Simple pitch diameter indicating thread gaugesThe simple pitch diameter indicating gauge with cone and vee rolls or segments or rolls with the best wire size radius allows to ensure that the pitch diame
43、ter is greater than the minimum limit. The indicators are set to the GO threaded setting plug gauge. Readings indicate the position of the pitch diameter and the minimum measurement shall be no less than the minimum pitch diameter limit. The minimum measured pitch diameter shall be within the ISO 58
44、55-1 form variation limit compared to the virtual pitch diameter measurement in accordance with the differential value given in 6.1.1. The simple pitch diameter contacts have cone and vee rolls or segments which contact the product pitch cylinder. Other designs have two or three rolls with radii on
45、annular ribs on rolls made to best ISO 2016 All rights reserved 3BS ISO 10959:2016ISO 10959:2016(E)wire size. The product thread contacts is restricted to 1,5 pitch lengths. See Figures 2 and 3 for design and contact form.6.1.4 Major diameter gaugesThe maximum limit of the major diameter may be chec
46、ked with a plain ring gauge, a plain GO calliper, or plain diameter measuring device (see Figure 4). The minimum limit of the major diameter shall be measured with a plain diameter measuring device set to a plain diameter plug with HPtolerance in accordance with ISO 1502. Plain micrometer calliper m
47、ay be used to measure the major diameter and may have standard gauge block settings.6.1.5 Minor diameter gaugesIt shall be set to the plain minor diameter setting plug with HPtolerance, in accordance with ISO 1502. See Figure 5 for design and contact form.6.1.6 Optical comparator checksThe optical c
48、omparator shall be used to verify the root radius by comparing the shadow contour to the radius charts. The minor diameter may also be measured with an optical comparator using appropriate measuring techniques.6.2 Gauging for internal threads6.2.1 GO screw plug gaugesTo ensure ease of assembly of th
49、reads and conformance to the maximum material virtual pitch and major diameter limits, GO screw plug gauges specified in ISO 1502 or the full form GO screw plug gauge in accordance with the details described in 6.2.3.2 shall be used.6.2.2 NOT GO screw plug gaugesTo check that the minimum virtual pitch diameter is not greater than the maximum limit, NOT GO screw plug gauges specified in ISO 1502 shall be used.6.2.3 Minor diameter gauges6.2.3.1 The minimum minor diameter may be evaluated by a plain cylindrical GO p
