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1、 Reference number ISO 10684:2004(E) ISO 2004 INTERNATIONAL STANDARD ISO 10684 First edition 2004-07-15 Fasteners Hot dip galvanized coatings lments de fixation Revtements de galvanisation chaud Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=N
2、ASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:10:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10684:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or vi
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5、 for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any mea
6、ns, 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 office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyr
7、ightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:10:42 MDTNo reproduction or networking per
8、mitted without license from IHS -,-,- ISO 10684:2004(E) ISO 2004 All rights reserved iii Contents Page Forewordiv 1 Scope1 2 Normative references .1 3 Terms and definitions.2 4 Materials.3 4.1 Raw material of parts3 4.2 Zinc.3 5 Hot dip galvanizing procedures and precautions .3 5.1 Stress relief3 5.
9、2 Cleaning and pickling.3 5.3 Baking 3 5.4 Fluxing3 5.5 Hot dip galvanizing.3 5.6 Spinning and quenching4 5.7 Special requirements for nuts .4 5.8 Post-treatment.4 6 Requirements on thread tolerances and additional marking.4 6.1 General.4 6.2 Requirements and precautions in assembling hot dip galvan
10、ized threaded fasteners4 6.3 Special requirements for marking when supplying fasteners in sealed containers8 7 Mechanical properties of nuts tapped oversize and undersize threaded bolts, screws and studs.8 8 Coating requirements.8 8.1 Appearance of zinc coating .8 8.2 Considerations for hot dip galv
11、anized washers8 8.3 Zinc coating thickness .8 8.4 Adhesion of zinc coating8 9 Lubrication.9 10 Ordering requirements.9 11 Designation9 Annex A (normative) Special requirements for bolts, screws and nuts with thread sizes M8 and M10 .11 Annex B (normative) Limits of sizes for hot dip galvanized inter
12、nal and external screw thread M813 Annex C (informative) Calculation of minimum ultimate tensile loads and proof loads for bolts and screws M8 and M10 with threads undersized to tolerance class 6az15 Annex D (informative) Surface areas of bolts, screws and nuts .16 Annex E (normative) Adherence of h
13、ot-dip galvanized coating19 Annex F (informative) Strength of hot dip galvanized bolt or screw and nut assemblies20 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:10:42 MDTNo
14、 reproduction or networking permitted without license from IHS -,-,- ISO 10684:2004(E) iv ISO 2004 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Sta
15、ndards 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, governmental and non-governmental, in liaison with ISO, also
16、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 the ISO/IEC Directives, Part 2. The main task of technical committees
17、 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 the member bodies casting a vote. Attention is drawn to the possibi
18、lity 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 10684 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical properties of fasteners. Copyright In
19、ternational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:10:42 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 10684:2004(E) ISO 2004 All right
20、s reserved 1 Fasteners Hot dip galvanized coatings 1 Scope This International Standard specifies material, process, dimensional and some performance requirements for hot dip spun galvanized coatings applied to coarse threaded steel fasteners from M8 up to and including M64 and for property classes u
21、p to and including 10.9 for bolts, screws and studs and 12 for nuts. It is not recommended to hot dip galvanize threaded fasteners in diameters smaller than M8 and/or with pitches below 1,25 mm. NOTE Attention is drawn to the fact that the proof loads and stresses under proof load of oversize tapped
22、 nuts with threads M8 and M10 and the ultimate tensile loads and proof loads of undersize threaded bolts and screws with threads M8 and M10 are reduced as compared to the values specified in ISO 898-2 and ISO 898-1 respectively and are specified in Annex A. It primarily concerns the spun hot dip gal
23、vanizing of threaded steel fasteners, but it may also be applied to other threaded steel parts. The specifications given in this International Standard may also be applied to non-threaded steel parts such as washers. 2 Normative references The following referenced documents are indispensable for the
24、 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 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and
25、studs ISO 898-2, Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse thread ISO 965-1, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data ISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for
26、general purpose external and internal screw threads Medium quality ISO 965-3, ISO general purpose metric screw threads Tolerances Part 3: Deviations for constructional screw threads ISO 965-4, ISO general purpose metric screw threads Tolerances Part 4: Limits of sizes for hot-dip galvanized external
27、 screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing ISO 965-5, ISO general purpose metric screw threads Tolerances Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tol
28、erance position h before galvanizing Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:10:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10684:
29、2004(E) 2 ISO 2004 All rights reserved ISO 1460, Metallic coatings Hot dip galvanized coatings on ferrous materials Gravimetric determination of the mass per unit area ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles Specifications and test methods ISO 2064, Metallic and o
30、ther inorganic coatings Definitions and conventions concerning the measurement of thickness ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic method ISO 8991, Designation system for fasteners 3 Terms and definitions For the purposes of this document, th
31、e terms and definitions given in ISO 2064 (in particular, the definitions of significant surface, measuring area, local thickness, minimum local thickness and average thickness) and the following apply. 3.1 batch quantity of identical parts cleaned, pickled, fluxed and galvanized together at one tim
32、e in a galvanizing basket 3.2 production lot batches of parts originating from the same manufacturing lot, processed continuously through cleaning, pickling, fluxing, dipping in molten zinc and spun in a centrifuge without any change in temperature and concentration of the constituents of the proces
33、s 3.3 batch average thickness calculated average thickness of a coating as 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 3.5 stress reli
34、ef process of heating parts for a definite time at a given temperature in order to relieve stress induced by work hardening 3.6 hot dip galvanizing of fasteners process whereby steel fasteners are zinc coated by immersion in a bath of molten zinc, resulting in the formation of a zinc-iron alloy coat
35、ing or a zinc-iron alloy coating plus a zinc coating at the surface of the fastener NOTE This process involves the removal of excess zinc by spinning the parts in a centrifuge or by an equivalent method. Copyright International Organization for Standardization Provided by IHS under license with ISO
36、Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:10:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10684:2004(E) ISO 2004 All rights reserved 3 4 Materials 4.1 Raw material of parts 4.1.1 Chemical composition Materials as included in ISO
37、898-1 and ISO 898-2 are suitable for hot dip galvanizing except if the total content of phosphorus and silicon is between 0,03 % and 0,13 %, in which case high temperature galvanizing (530 C to 560 C) is recommended. 4.1.2 Surface condition The surface of the fastener, before immersion in the molten
38、 zinc, shall be clean and free from all contaminants that would adversely effect the galvanizing. 4.2 Zinc The zinc used for this process shall be in accordance with ISO 1461. 5 Hot dip galvanizing procedures and precautions 5.1 Stress relief Fasteners subjected to severe work hardening may require
39、stress relief before acid cleaning and hot dip galvanizing. 5.2 Cleaning and pickling Parts shall be cleaned. During the cleaning process, hydrogen could be absorbed into the steel. The hydrogen may not effuse completely in the galvanizing bath and consequently, may lead to brittle failure. Unless o
40、therwise agreed, parts heat treated or work hardened to a hardness of W 320 HV shall be cleaned using an inhibited acid, alkaline or mechanical process. Immersion time in the inhibited acid depends on the as-received surface condition and should be of minimum duration. NOTE An inhibited acid is an a
41、cid to which a suitable inhibitor has been added to reduce corrosive attack on the steel and absorption of hydrogen. 5.3 Baking If baking is carried out, it shall be carried out prior to surface activation. 5.4 Fluxing Parts shall be surface activated, and dried if necessary. 5.5 Hot dip galvanizing
42、 Normal temperature galvanizing is carried out at a bath temperature of 455 C to 480 C. High temperature galvanizing is used to produce a smoother and thinner coating and is carried out at a bath temperature of 530 C to 560 C. The finish obtained using the high temperature process is dull. In order
43、to avoid micro- cracks, bolts, screws and studs of property class 10.9 in sizes M27 and above, shall not be high temperature galvanized. Galvanizing shall not be carried out at bath temperatures between 480 C and 530 C. Copyright International Organization for Standardization Provided by IHS under l
44、icense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 20:10:42 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10684:2004(E) 4 ISO 2004 All rights reserved 5.6 Spinning and quenching Parts shall be spun immediately following removal f
45、rom the galvanizing bath and quenched in water or air cooled depending on size consideration. 5.7 Special requirements for nuts Nut threads and other internal threads shall be tapped after hot dip galvanizing. Retapping shall not be permitted. 5.8 Post-treatment Most galvanized parts do not require
46、any post treatment. When required by the purchaser, treatments such as chromating or phosphating may be applied to reduce the possibility of wet storage staining (white corrosion) or to assist subsequent painting. 6 Requirements on thread tolerances and additional marking 6.1 General Dimensional lim
47、its for ISO metric screw threads M10 to M64 before and after coating are specified in ISO 965-1 to ISO 965-5. All other dimensions and tolerances of fasteners apply before hot dip galvanizing. Dimensional limits for internal and external screw threads M8 with thread tolerances 6AX and 6AZ for intern
48、al threads and 6az for external threads are specified in Annex B. NOTE It is not possible to check the thread tolerance of a hot dip galvanized part by stripping the coating and gauging the thread thereafter, since some steel is dissolved from the part during the galvanizing process. 6.2 Requirements and precautions in assembling hot dip galvanized threaded fasteners 6.2.1 General This clause applies only to parts with thread tolerances in accordance with ISO 965-1 to ISO 965-5 and with