1、BRITISH STANDARD BS EN Is0 26.220.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PEBMIITED BY COPYRIGHT LAW - - COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN IS0 q042-ENGL 2000 D LbZlbb7 0847007 blL = BS EN IS0 442:2000 been prepared under the
2、 direction of the Engineering Sector committee, was published under the authority of the Standards Commiaee and comes into effect on 16 May 2000 Amd. No. Q BSI 62000 _ ISBN O 580 34867 9 National foreword Date Coments This British Standard is the official Engiish anguage version of EN IS0 40421999.
3、It is identical with IS0 442:1999. The UK participation in its preparation was entrusted by Technical Committee FME/s, Bolts, nuts and accessories, to Subcommittee FME/s/1, Mechanical properties of fasteners, which has the responsibiuty to: - aid enquirers to undeistand the text; - present to the re
4、sponsible European committee any enquiries on the - monitor related intedonal and European developments and promulgate inkrpretaion, or proposals for change, and keep the UK interests inform4 them in the UK A list of organizations represented on this subcommittee can be obtained on request to its se
5、cretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to intemational publications with their corresponding European publications. The British Standards which implement international or European publications
6、 referred to in this document may be found in the BSI Standards Caalogue under the section entitled ?nmational Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a
7、contract Usem of British standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. - - - - - - - . - . _ . - . - . - - _ - - Summary of pages This document comprises a front cover, an inside front cover, the
8、 EN Is0 tie page, the EN Is0 foreword page, the IS0 title page, pages ii and iii, a blank page, pages 1 to 23, the annex ZA page, an inside back cover and a back cover. The BSI copyright notice displayed in this document indimhs when the document waslastissued. - . - - - - - - - . - - - . _ . . . -
9、- - _ - - COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN IS0 LiOLi2-ENGL 2000 ILI Lb2qbL7 08Li7008 558 EUROPEAN STANDARD EN IS0 4042 NORME EUROPENNE EUROPISCHE NORM June 1999 ICs 21.060.10 English version Fasteners - Electroplated coatings (IS0
10、 4042:1999) Elments de fixation - Revtements lectrolytiques (IS0 4042: 1 999) Verbindungselemente - Galvanische berzge (IS0 4042: 1999) This European Standard was approved by CEN on 26 May 1999. CEN members are bound to comply wiih the CENICENELEC tntemai Regulations which stipulate the conditions f
11、or giving this European Standard the status of a national standard without any alteraon. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exkts in three official v
12、enions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium
13、, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMiITEE FOR STANDARDIZATION EUROPISCHES KOMITEE FUR NORMUNG COMITE EUROPEEN DE NORMALISATION Central Secretariat:
14、rue de Stassart, 36 -1050 Brussels Q 1999 CEN All rights of exploitation in any tom and by any means resewed worldwide for CEN national Members. Ref. No. EN IS0 4042:1999 E COPYRIGHT European Committee for StandardizationLicensed by Information Handling Services STD.BSI BS EN IS0 4042-ENGL ZOG0 lb24
15、bL7 0847009 474 I Corrected 940416 Foreword The text of the International Standard from Technical Committee ISO/TC 2 Fasteners of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEWC 185 “Threaded and non-threaded mechanical
16、 fasteners and accessories, the secretariat of which is held by national standard body. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1999, and conflicting national standards shall be w
17、ithdrawn at the latest by December 1999. According to the CEWCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Ita
18、ly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 4042:1999 has been approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards ar
19、e listed in annex ZA (normative). COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesINTERNATIONAL STANDARD IS0 4042 Second edition 1 999-06-1 5 Fasteners - Electroplated coatings E/ments de fixation - Revtements /ectro/ytiques Reference number IS0 4042: 1999(E)
20、 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesIS0 4042:1999(E) Contents Page 1 Scope 1 2 Normative references 1 3 Terms and definitions . 2 4 Dimensional requirements and gauging . 3 4.1 Dimensional requirements before electroplating 3 4.2 Dimensional requ
21、irements after electroplating . 3 5 Other coating requirements 3 6 Hydrogen embrittlement relief 3 7 Corrosion protection . 4 8 Applicability to fasteners that cut or form their own mating threads 4 9 Specification of coating thickness . 4 10 Measurement of coating thickness 5 10.1 Local thickness .
22、 5 10.2 Batch average thickness 7 10.3 Agreement on test method 7 11 Sampling for thickness tests 7 12 Ordering requirements for electroplating . 7 13 Designation 7 Annex A (informative) Hydrogen embrittlement relief . 8 Annex C (informative) Guidance on procedures that may be adopted to accommodate
23、 thick coatings . 12 Annex D (normative) Determination of batch average thickness 13 Annex B (informative) Salt spray corrosion protection performance of metallic coatings . 10 Annex E (normative) Designation code, system A, for electroplated coatings on threaded parts . 16 Annex F (informative) Exa
24、mples for coating designation . 19 Annex G (informative) Surface areas of bolts, screws and nuts 20 Bibliography 23 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesForeword IS0 (the International Organization for Standardization) is a worldwide federation of
25、national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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. Inte
26、rnational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with th
27、e rules given in the ISOAEC Directives, Part 3. 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 Oh of the member bodies casting a vote. International Standard I
28、S0 4042 was prepared by Technical Committee ISOTTC 2, Fasteners, Subcommittee SC1, Mechanical propeflies of fasteners. This second edition cancels and replaces the first edition (IS0 4042:1989) which has been technically revised. Annexes D and E form a normative part of this International Standard.
29、Annexes A, 9, C, F and G are for information only. . 111 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN IS0 LiCLi2-ENGL 2OUO I lib24bb 0847033 915 E INTERNATIONAL STANDARD IS0 4042: 1 999( E) Fasteners - Electroplated coatings 1 Scope I This In
30、ternational Standard specifies dimensional requirements for electroplated fasteners of steel or copper alloy. It specifies coating thicknesses and gives recommendations for hydrogen embrittlement relief for fasteners with high tensile strength or hardness and for surface-hardened fasteners. This Int
31、ernational Standard primarily concerns the electroplating of threaded fasteners, but it may also be applied to other threaded parts. For the applicability to screws that cut or form their own mating threads, see clause 8. The specifications given in this International Standard may also be applied to
32、 non-threaded parts such as washers and pins. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publica
33、tions do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to appl
34、ies. Members of IS0 and IEC maintain registers of currently valid International Standards. IS0 965-1:1999, IS0 general purpose metric screw threads - Tolerances - Part 1: Principles and basic data. IS0 965-2:1999, IS0 general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for ge
35、neral purpose bolt and nut threads - Medium quality. IS0 965-3:1999, /SO general purpose metric screw threads - Tolerances - Part 3: Deviations for constructional threads. IS0 1456:1988, Metallic coatings - Electrodeposited coatings of nickel plus chromium and of copper plus nickel plus chromium. IS
36、0 1458:1988, Metallic coating - Electrodeposited coatings of nickel. IS0 1502:1996, IS0 general purpose metric screw threads - Gauges and gauging. IS0 2064:1996, Metallic and other non-organic coatings - Definitions and measurement of thickness. IS0 2081 :1986, Metallic coatings - Electroplated coat
37、ings of zinc on iron or steel. ntions ncerning the IS0 2082:1986, Metallic coatings - Electroplated coatings of cadmium on iron or steel. 1 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesIS0 4042: 1 999( E) IS0 3269:-l), Fasteners - Acceptance inspection. IS
38、0 4520:1981, Chromate conversion coatings on electroplated zinc and cadmium coatings. IS0 9227:1990, Corrosion tests in artificial atmospheres - Salt spray tests. IS0 9587:2), Metallic and other inorganic coatings - Pre-treatments of iron or steel for reducing the risk of hydrogen embrittlement. IS0
39、 15330:2), Fasteners - Preloading test for the detection of hydrogen embrittlement - Parallel bearing surface method. 3 Terms and definitions For the purposes of this International Standard, the definitions given in IS0 2064 (in particular, the definitions of significant surface, measuring area, loc
40、al thickness and minimum local thickness) and IS0 3269 together with the following, apply. 3.1 batch quantity of identical fasteners from the same manufacturing lot processed together at one time 3.2 production run those batches of parts processed continuously without any changes in coating techniqu
41、es or constituents 3.3 batch average thickness calculated average thickness of a coating if it was uniformly distributed over the surface of the parts of the batch 3.4 baking process of heating parts for a definite time at a given temperature in order to minimize the risk of hydrogen embrittlement 3
42、.5 baking duration time at which the parts are held at the specified temperature which they shall have completely reached l) To be published. (Revision of IS0 3269:1988) 2, To be published. 2 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesIS0 4042:1999(E) 4
43、Dimensional requirements and gauging 4.1 Dimensional requirements before electroplating Before coating, parts shall comply with the relevant International Standards if applicable or other standards as specified, except where threads or other features are specifically manufactured to allow, for funct
44、ional reasons, the application of thicker coatings than are possible on normal threads. Coating thicknesses which can be applied on IS0 metric threads in accordance with IS0 965-1, IS0 965-2 and IS0 965-3 depend on the fundamental deviation available, which itself depends on the screw thread and the
45、 following tolerance positions: - g, f, e for external threads; - G for internal threads or H if required. The tolerance positions apply prior to application of the electroplated coating. 4.2 Dimensional requirements after electroplating After coating, IS0 metric screw threads shall be gauged in acc
46、ordance with IS0 1502 with a GO gauge of tolerance position h for external threads and H for internal threads. Other product dimensions apply only before coating. NOTE of internal drives; in these cases an agreement should be made between the supplier and the purchaser. Care should be exercised wher
47、e relatively thick coatings may affect dimensions with small tolerances as in the case The applicability of the recommended coatings to IS0 metric threads is limited by the fundamental deviation of the threads concerned and hence, by the pitch and tolerance positions. The coating shall not cause the
48、 zero line (basic size) to be exceeded in the case of external threads, nor shall it fall below this line in the case of internal threads. This means that for an internal thread of tolerance position H, a measurable coating thickness can only be applied I to the threads if the tolerance zone is not
49、taken up to the zero line (basic size). 5 Other coating requirements The electroplated coating shall comply with the provisions of the relevant International Standards (IS0 1456, IS0 1458, IS0 2081, IS0 2082) for the coating concerned in respect of appearance, adhesion, ductility, corrosion resistance, etc. 6 Hydrogen embrittlement relief In cases of parts - with high tensile strength or hardness or which have been surface hardened, - which have absorbed hydrogen and - are under tensile stress there is the risk of failure due to hydrogen embrittlemen
