1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationRoad vehicles Flat attachment fixing nuts for commercial vehicles Test methodsBS ISO 10597:2012National forewordThis British Standard is the UK implementation of ISO 10597:2012.T
2、he UK participation in its preparation was entrusted to Technical CommitteeAUE/4, Tyres and wheels for motor vehicles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contr
3、act. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 76631 2 ICS 43.040.50Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the aut
4、hority of the Standards Policy and Strategy Committee on 31 March 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS ISO 10597:2012 ISO 2012Road vehicles Flat attachment fixing nuts for commercial vehicles Test methodsVhicules routiers crous de fixation des roues a
5、ttache plate pour vhicules utilitaires Mthodes dessaiINTERNATIONAL STANDARDISO10597Third edition2012-03-01Reference numberISO 10597:2012(E)BS ISO 10597:2012ISO 10597:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of
6、 this 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 either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1
7、211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 10597:2012ISO 10597:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Test method for nut body 13.1 Proof load
8、 test procedure . 13.2 Rejection criteria . 34 Nut assembly test methods 44.1 Torque/tension Clamping force 44.2 Torque/tension Retorque 5Bibliography . 6BS ISO 10597:2012ISO 10597:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards
9、 bodies (ISO 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 organiza
10、tions, governmental 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.International Standards are drafted in accordance with the rules given in th
11、e ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of t
12、he member bodies casting a vote.Attention 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.ISO 10597 was prepared by Technical Committee ISO/TC 22, Road vehicles
13、, Subcommittee SC 19, Wheels.This third edition cancels and replaces the second edition (ISO 10597:2004), of which this constitutes a minor revision.iv ISO 2012 All rights reservedBS ISO 10597:2012ISO 10597:2012(E)IntroductionThis International Standard was developed to provide test methods for eval
14、uating flat attachment fixing nuts for use as wheel fasteners. The test methods are based on the needs of the wheel in order to function properly. These fasteners were first standardized dimensionally in ISO 7575 and this International Standard extends this standardization. ISO 2012 All rights reser
15、ved vBS ISO 10597:2012Road vehicles Flat attachment fixing nuts for commercial vehicles Test methods1 ScopeThis International Standard specifies test methods and performance requirements for ensuring proper wheel or rim assembly on road vehicles by means of hexagonal nuts with a flat seating captive
16、 washer used with 18 mm, 20 mm and 22 mm studs. It is applicable to commercial vehicles as defined in ISO 3833 and to those nuts as specified in ISO 7575. It is not applicable to fasteners for less common or special applications.2 Normative referencesThe following referenced documents are indispensa
17、ble for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6157-2, Fasteners Surface discontinuities Part 2: Nuts3 Test method for nut body3.1 Proof load
18、test procedureUse only fully processed nut assemblies with required corrosion protection which are production parts intended for the vehicle.Measure the initial height of the nut, H, before beginning the proof load/compression test.Load the nut on a threaded fixture or bolt as shown in Figure 1 or 2
19、. The complete nut assembly shall be loaded axially through the threads three times to a load of 0,6 proof load (F).Measure the final height of the nut, H.After three loadings, apply a fourth loading of 1 F. The values for proof load F calculated for nuts in property class 10 shall be according to T
20、able 1. Hold the load for 15 s.The nut shall resist the load without failure by stripping or rupture and shall be removable by hand after the load is released. If the threads on the bolt or test fixture are damaged during the test, the test should be discarded. The test fixture or test bolt (suggest
21、ed class 10.9 or higher) used shall be threaded to a tolerance class that is representative of the parts to be used in production.It could be necessary to use a manual wrench to start the nut in motion. Such wrenching is permissible, provided that it is restricted to one half-turn and that the nut i
22、s then removable by hand.INTERNATIONAL STANDARD ISO 10597:2012(E) ISO 2012 All rights reserved 1BS ISO 10597:2012ISO 10597:2012(E)Dd=+025040,whereD is the diameter of the clearance hole, in millimetres;d is the nominal diameter of the thread, in millimetres.Key1 bolt or threaded fixture2 nut assembl
23、y3 fixed plateFigure 1 Two-piece flange nut proof/tension test arrangement2 ISO 2012 All rights reservedBS ISO 10597:2012ISO 10597:2012(E)Dd=+025040,whereD is the diameter of the clearance hole, in millimetres;d is the nominal diameter of the thread, in millimetres.Key1 bolt or threaded fixture2 nut
24、 assembly3 fixed plateFigure 2 Two-piece flange nut proof/compression test arrangementTable 1 Proof loadsThread Proof load valuesFkNM18 1,5 235M20 1,5 295M22 1,5 3603.2 Rejection criteriaThe criteria for rejection due to cracks or other surface discontinuities shall be according to ISO 6157-2.The pe
25、rmanent deformation in nut height H after unloading shall not exceed 0,13 mm. ISO 2012 All rights reserved 3BS ISO 10597:2012ISO 10597:2012(E)Thread deformation shall be checked with a go/no-go thread gauge built to the specifications of the particular thread designation.4 Nut assembly test methods4
26、.1 Torque/tension Clamping force4.1.1 PurposeThe purpose of this test is to ensure the ability of the nut assembly with required corrosion protection to provide proper clamping force. If the use of a lubricant is found to be necessary in order for components to conform to the acceptance criteria, th
27、is shall be stated in the test results. The specification of the lubricant, details of the surfaces lubricated and the frequency of reapplication shall also be stated. The coefficient of friction should be representative of production parts. The wheel or vehicle manufacturer may determine the fricti
28、on levels necessary for actual applications.4.1.2 SelectionUse only fully processed nut assemblies with required corrosion protection which are representative of production parts intended for the vehicle. New and separate nuts and studs or bolts should be used for each test.4.1.3 Test procedureTest
29、the nut on a bolt test stand which can display all necessary data. Record the overall tightening torque and the bolt tension; optionally, the head friction torque/thread friction torque may also be recorded.Apply the force using a tightening device with a rotational speed of 2 r/min to 10 r/min. The
30、 washer reaction face on the fixture should be secured against rotation. Test bolts shall be representative of those used in production. Torque to the initial value given in Table 2, take measurements of the tension of the bolt and then continue to torque to the final value according to Table 2, aga
31、in measuring the tension of the bolt. Table 2 gives minimum and maximum test torques and tensions.Table 2 Test torques and tensionsThread Initial torqueNmMinimum initial tensionkNFinal torqueNmMaximum final tensionkNM18 1,5 250 80 420 225M20 1,5 339 100 610 295M22 1,5 500 133 700 3104.1.4 Rejection
32、criteriaThe component shall be rejected if any of the following occurs:a) inability to reach minimum tension value at initial torque;b) exceeding of maximum tension value at final torque;c) stripping of the nut thread;d) inability to withstand final torque;e) new, visible crack penetrating through a
33、 section (commercially available crack detection devices and techniques may be used to supplement visual inspection).4 ISO 2012 All rights reservedBS ISO 10597:2012ISO 10597:2012(E)If the threads of the test bolt are damaged during testing, the test shall be discarded. Nuts shall be evaluated for cr
34、acks prior to, as well as after, the test.If any of the criteria listed in items a) to e) are noted, it may be necessary to rerun the torque tension test on a hardened mandrel, in order to determine which part (nut or bolt) is the cause of the failure. This mandrel should be hardened to 45 HRC minim
35、um and have threads representative of production bolts.4.2 Torque/tension Retorque4.2.1 PurposeThe purpose of this test is to ensure the repeatability of the torque/tension curve.4.2.2 SelectionUse only fully processed nut assemblies with required corrosion protection and bolt surfaces which are rep
36、resentative of production parts intended for the vehicle. New and separate nuts and studs or bolts should be used for each test.4.2.3 Test procedureRetorque the nut to the final torque shown in Table 2 five times on a machine according to the procedure given in 4.1.3.4.2.4 Rejection criteriaRejectio
37、n criteria shall be the same as those given in 4.1.4 and, in addition, a 30 % drop in tension between the initial and fifth retorque shall also constitute a failure. ISO 2012 All rights reserved 5BS ISO 10597:2012ISO 10597:2012(E)Bibliography1 ISO 898-6, Mechanical properties of fasteners Part 6: Nu
38、ts with specified proof load values Fine pitch thread2 ISO 3833, Road vehicles Types Terms and definitions3 ISO 3894, Road vehicles Wheels/rims for commercial vehicles Test methods4 ISO 3911, Wheels and rims for pneumatic tyres Vocabulary, designation and marking5 ISO 4107, Commercial vehicles Wheel
39、-hub attachment dimensions6 ISO 7575, Commercial road vehicles Flat attachment wheel fixing nuts6 ISO 2012 All rights reservedBS ISO 10597:2012This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other
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