1、BRITISH STANDARDBS EN ISO 8748:2007Spring-type straight pins Coiled, heavy dutyThe European Standard EN ISO 8748:2007 has the status of a British StandardICS 21.060.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g5
2、3g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 8748:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 58493 0National forewordThis British Standard is the UK implementation
3、 of EN ISO 8748:2007. It supersedes BS EN ISO 8748:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee FME/9, Nuts, bolts and accessories/steering committee.A list of organizations represented on this committee can be obtained on request to its secret
4、ary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDN
5、ORME EUROPENNEEUROPISCHE NORMEN ISO 8748April 2007ICS 21.060.50 Supersedes EN ISO 8748:1997 English VersionSpring-type straight pins - Coiled, heavy duty (ISO 8748:2007)Goupilles lastiques spirales - Srie paisse (ISO8748:2007)Spiralspannstifte - Schwere Ausfhrung (ISO 8748:2007)This European Standar
6、d was approved by CEN on 22 March 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such n
7、ationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and
8、notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, M
9、alta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of explo
10、itation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 8748:2007: EForeword This document (EN ISO 8748:2007) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in collaboration with Technical Committee CEN/TC 185 “Fasteners”, the secretariat of whi
11、ch is held by DIN. 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 October 2007, and conflicting national standards shall be withdrawn at the latest by October 2007. This document supersedes EN IS
12、O 8748:1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ire
13、land, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 8748:2007 has been approved by CEN as EN ISO 8748:2007 without any modifications. EN ISO 8748:2007R
14、eference numberISO 8748:2007(E)INTERNATIONAL STANDARD ISO8748Third edition2007-04-15Spring-type straight pins Coiled, heavy duty Goupilles lastiques spirales Srie paisse EN ISO 8748:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national stan
15、dards 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 org
16、anizations, 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
17、 in the 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
18、 % of the 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 8748 was prepared by Technical Committee ISO/TC 2, Fasten
19、ers, Subcommittee SC 10, Product standards for fasteners. This third edition cancels and replaces the second edition (ISO 8748:1997), which has been technically revised. EN ISO 8748:2007blank1Spring-type straight pins Coiled, heavy duty 1 Scope This International Standard specifies the characteristi
20、cs of coiled heavy duty spring-type straight pins made of steel or of austenitic or martensitic stainless steel, with a nominal diameter, d1, from 1,5 mm to 20 mm inclusive. NOTE Spring-type straight pins, coiled, standard duty, and spring-type straight pins, coiled, light duty, are the subjects of
21、ISO 8750 and ISO 8751, respectively. 2 Normative references The following referenced documents are indispensable 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
22、) applies. ISO 286-2, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts ISO 3269, Fasteners Acceptance inspection ISO 4042, Fasteners Electroplated coatings ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO
23、8749, Pins and grooved pins Shear test 3 Dimensions See Figure 1 and Table 1. aSwaged chamfer at both ends. Figure 1 EN ISO 8748:20072 Table 1 Dimensions Dimensions in millimetres nom. 1,5 2 2,5 3 3,5 4 5 6 8 10 12 14 16 20 max. 1,71 2,21 2,73 3,25 3,79 4,30 5,35 6,40 8,55 10,65 12,75 14,85 16,9 21,
24、0d1before mounting min. 1,61 2,11 2,62 3,12 3,64 4,15 5,15 6,18 8,25 10,30 12,35 14,40 16,4 20,4d2before mounting max. 1,4 1,9 2,4 2,9 3,4 3,9 4,85 5,85 7,8 9,75 11,7 13,6 15,6 19,6a 0,5 0,7 0,7 0,9 1 1,1 1,3 1,5 2 2,5 3 3,5 4 4,5 s 0,17 0,22 0,28 0,33 0,39 0,45 0,56 0,67 0,9 1,1 1,3 1,6 1,8 2,2 a 1
25、,9 3,5 5,5 7,6 10 13,5 20 30 53 84 120 165 210 340 Minimum shear strength, double, kN b 1,45 2,5 3,8 5,7 7,6 10 15,5 23 41 64 91 l cnom. min. max. 4 3,75 4,25 5 4,75 5,25 6 5,75 6,25 8 7,75 8,25 10 9,75 10,25 12 11,5 12,5 14 13,5 14,5 16 15,5 16,5 18 17,5 18,5 20 19,5 20,5 22 21,5 22,5 24 23,5 24,5
26、26 25,5 26,5 28 27,5 28,5 Range 30 29,5 30,5 32 31,5 32,5 35 34,5 35,5 of 40 39,5 40,5 45 44,5 45,5 50 49,5 50,5 commercial 55 54,25 55,75 60 59,25 60,75 65 64,25 65,75 lengths 70 69,25 70,75 75 74,25 75,75 80 79,25 80,75 85 84,25 85,75 90 89,25 90,75 95 94,25 95,75 100 99,25 100,75 120 119,25 120,7
27、5 140 139,25 140,75 160 159,25 160,75 180 179,25 180,75 200 199,25 200,75 aApplies to steel and martensitic corrosion-resistant steel products. bApplies to austenitic stainless steel products. cFor nominal lengths above 200 mm, steps of 20 mm. EN ISO 8748:200734 Application The diameter of the hole
28、into which the spring pin is to be inserted shall be equal to the nominal diameter, d1, of the mating pin and to tolerance class H12, in accordance with ISO 286-2. 5 Requirements and reference International Standards See Table 2. Table 2 Requirements and reference International Standards Steel Auste
29、nitic stainless steel Martensitic stainless steel St A C All pin diameters Alternative for pin diameters d1 12 mm Chemical composition limits (chemical analysis) % Chemical compositions limits (chemical analysis) % C W 0,64 Mn W 0,60 Si W 0,15 Cr b P u 0,04 S u 0,05 C W 0,38 Mn W 0,70 Si W 0,20 Cr W
30、 0,80 V W 0,15 P u 0,035 S u 0,04 C u 0,15 Mn u 2,00 Si u 1,50 Cr 16 to 20 Ni 6 to 12 P u 0,045 S u 0,03 Mo u 0,8 C W 0,15 Mn u 1,00 Si u 1,00 Cr 11,5 to 14 Ni u 1,00 P u 0,04 S u 0,03 Hardened and tempered to a Vickers hardness of 420 HV to 545 HV Cold worked Hardened and tempered to a Vickers hard
31、ness of 460 HV to 560 HV Material aHardness testing according to ISO 6507-1. Hardness testing according to ISO 6507-1. Plain, i.e. pins to be supplied in natural finish, treated with a protective lubricant, unless otherwise specified by agreement between customer and supplier. If pins are surface co
32、ated, appropriate plating or coating processes should be employed to avoid hydrogen embrittlement. Due to the risk of hydrogen embrittlement, pins should not be electroplated or phosphate-coated. If electroplating or phosphate coating is required for corrosion prevention, by agreement between custom
33、er and supplier, it is mandatory that the pins be baked immediately after plating to minimize the risk of hydrogen embrittlement, see also hydrogen embrittlement relief according to ISO 4042. Nevertheless, freedom from hydrogen embrittlement is not absolutely guaranteed. Surface finish All tolerance
34、s shall apply prior to the application of a plating or coating. Plain, i.e. pins to be supplied in natural finish. Workmanship Pins shall be free of irregularities or detrimental defects. No burrs shall appear on any part of the pin. Shear strength test The test shall be in accordance with ISO 8749.
35、 Acceptability The acceptance procedure shall be in accordance with ISO 3269. aOther materials as agreed between customer and supplier. bUse of Cr is optional. EN ISO 8748:20074 6 Designation EXAMPLE 1 A spring-type straight pin, coiled, heavy duty, with nominal diameter d1= 6 mm and nominal length
36、l = 30 mm, made of steel (St) is designated as follows: Spring pin ISO 8748 - 6 30 - St EXAMPLE 2 A spring-type straight pin, coiled, heavy duty, with nominal diameter d1= 6 mm and nominal length l = 30 mm, made of austenitic stainless steel (A) is designated as follows: Spring pin ISO 8748 - 6 30 -
37、 A EN ISO 8748:20075Bibliography 1 ISO 8750, Spring-type straight pins Coiled, standard duty 2 ISO 8751, Spring-type straight pins Coiled, light duty EN ISO 8748:2007BS EN ISO 8748:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsi
38、ble for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments
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