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1、BRITISH STANDARD BS EN ISO 10666:1999 Drilling screws with tapping screw threads Mechanical and functional properties The European Standard EN ISO 10666:1999 has the status of a British Standard ICS 21.060.10 BS EN ISO 10666:1999 This British Standard, having been prepared under the direction of the
2、 Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 1999 BSI 03-2000 ISBN 0 580 35004 5 National foreword This British Standard is the English language version of EN ISO 10666:1999. It is identical with ISO 10666:1999. The
3、UK participation in its preparation was entrusted by Technical Committee FME/9, Bolts, nuts and accessories, to Subcommittee FME/9/2, Slotted and recessed head screws, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee a
4、ny enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-referenc
5、es Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in
6、 the BSI Standards Catalogue under the section entitled “International 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 contract. Users of British Standards are
7、 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, pages i and ii, the EN ISO title page, page 2, the ISO title page, pages ii to iv,
8、pages 1 to 6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments BS EN ISO 10666:1999 BSI 03-2000i Contents Pa
9、ge National forewordInside front cover Foreword2 Forewordiii Text of ISO 106661 ii blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 10666 September 1999 ICS 21.060.00 English version Drilling screws with tapping screw thread Mechanical and functional properties (ISO 10666:1999) Vis aut
10、operceuses avec filetage de vis tle Caractristiques mcaniques et fonctionnelles (ISO 10666:1999) Bohrschrauben mit Blechschraubengewinde Mechanische und funktionnelle Eigenschaften (ISO 10666:1999) This European Standard was approved by CEN on 16 July 1999. CEN members are bound to comply with the C
11、EN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or t
12、o any CEN member. This European Standard exists in three official versions (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 version
13、s. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen
14、 de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 10666:1999 E EN ISO 10666:1999 BSI 03-2000 2 Foreword The text of th
15、e International Standard ISO 10666:1999 has been prepared by Technical Committee ISO/TC 2 “Fasteners” in collaboration with Technical Committee CEN/TC 185 “Threaded and non-threaded mechanical fasteners and accessories”, the secretariat of which is held by DIN. This European Standard shall be given
16、the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2000, and conflicting national standards shall be withdrawn at the latest by March 2000. According to the CEN/CENELEC Internal Regulations; the national standards organizations of
17、the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of th
18、e International Standard ISO 10666:1999 was approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative). EN ISO 10666:1999 ii BSI 03-2000 Contents Page Forewordiii 1Scope1 2Normative references1 3Requirements
19、1 4Testing2 5Torque wrenches5 Annex ZA (normative) Normative references to international publications with their relevant European publications6 Figure 1 Test fixture for the drilling and screwing-in-test3 Figure 2 Test arrangement for the drilling test4 Figure 3 Testing appliance for torsional test
20、5 Table 1 Case depth1 Table 2 Test data for the drilling and screwing-in-test3 Table 3 Test data for the drilled hole4 Table 4 Minimum torsional strength5 EN ISO 10666:1999 BSI 03-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standard
21、s 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 organiz
22、ations, 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
23、the ISO/IEC 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 % of the member bodies casting a vote. International Standard ISO 10666 was prep
24、ared by Technical Committee ISO/TC 2, Fasteners. iv blank EN ISO 10666:1999 BSI 03-20001 1 Scope This International Standard specifies the properties of heat treated screws with a tapping screw thread in accordance with ISO 1478, and which are designed with a drilling point which automatically drill
25、s the core hole for the screw during assembly. Such screws then automatically form the mating screw thread, either in a non-cutting or in a cutting operation, with the aid of the threaded portion of the screw adjoining the drilling point. The purpose of this International Standard is to ensure that
26、the screws are able to drill their core hole and form their mating screw thread without becoming distorted or fracturing in the process, provided that no overstressing has occurred. Consequently the following characteristics are regarded as representing the most important aspects for the assessment
27、of the mechanical and operational characteristics of a drilling screw: surface hardness; capability of core hole drilling and forming of the mating female screw thread; torsional strength. 2 Normative references The following normative documents contain provisions which, through reference in this te
28、xt, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re
29、cent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1478:1999, Tapping screw thread. ISO 4042:1999, Fasteners Elec
30、troplated coatings. ISO 6507-1:1997, Metallic materials Vickers hardness test Part 1: Test method. ISO 15330:1999, Fasteners Preloading test for the detection of hydrogen embrittlement Parallel bearing surface method. 3 Requirements 3.1 Material Case hardening steel or heat treatable steel shall be
31、used as the material for drilling screws. 3.2 Metallurgical properties 3.2.1 Surface hardness The minimum surface hardness of drilling screws after heat treatment shall be 530 HV 0,3. 3.2.2 Core hardness The core hardness after heat treatment shall be 320 HV 5 to 400 HV 5 for threads u ST 4,2 and 32
32、0 HV 10 to 400 HV 10 for threads ST 4,2 including a recommended minimum tempering temperature of 330 C. The tempering temperature range 275 C to 315 C shall be avoided in order to minimize the risk of tempered martensite embrittlement. 3.2.3 Case depth The case depth shall conform to the values give
33、n in Table 1. Table 1 Case depth 3.2.4 Microstructure The microstructure of drilling screws shall not exhibit any ferrite streaks between the surface zone and the core after heat treatment. 3.2.5 Hydrogen embrittlement For electroplated drilling screws there is a risk of failure due to hydrogen embr
34、ittlement. Therefore steps shall be taken by the manufacturer and/or the electroplater to manage the risk including test detection in accordance with ISO 15330. In this connection ISO 4042, in which measures for hydrogen embrittlement relief are described for electroplated fasteners, shall also be c
35、onsulted. 3.3 Mechanical properties 3.3.1 Core hole drilling capability The point of the drilling screw shall be shaped in such a way that it is capable of drilling the necessary core hole for forming the mating female screw thread under the test conditions specified in 4.2.1. 3.3.2 Thread forming c
36、apability Drilling screws shall be able to form a mating thread in the core hole drilled according to 3.3.1, without deforming their own thread when driven into a test plate in accordance with 4.2.1.1. Thread Case depth mm min.max. ST 2,9 and ST 3,50,050,18 ST 4,2 to ST 5,50,100,23 ST 6,30,150,28 EN
37、 ISO 10666:1999 2 BSI 03-2000 3.3.3 Torsional strength Drilling screws shall have a torsional strength such that the torque necessary to cause failure, when tested in accordance with 4.2.3, shall equal or exceed the minimum torque values given in Table 4 for the applicable screw threads. 4 Testing 4
38、.1 Testing of metallurgical properties 4.1.1 Testing of surface hardness The surface hardness shall be tested by a Vickers procedure as specified in ISO 6507-1. The indentation shall be made on a portion of the screw as flat as possible, preferably on the head of the screw. 4.1.2 Testing of the core
39、 hardness The core hardness shall be tested on a transverse micro-section by a with Vickers method as specified in ISO 6507-1. 4.1.3 Measuring the case depth The case depth shall be measured microscopically on a longitudinal micro-section at the thread flank mid-point between crest and root or, in t
40、he case of drilling screws up to and including ST 4,2, in the root of the thread. For referee purposes, a micro-hardness plot shall be made using a Vickers indenter and a 300 g load on the thread profile of a properly prepared metallographic specimen. The case depth shall be the point at which the r
41、ecorded hardness is 30 HV above the actual core hardness. 4.1.4 Examination of the structure The material microstructure shall be examined by metallography. 4.2 Testing of mechanical properties 4.2.1 Drilling and screwing-in-test 4.2.1.1 Test fixture Figure 1 illustrates an example of a suitable tes
42、t fixture. The test plate shall be made from low carbon steel with a carbon content not exceeding 0,23 %. The hardness of the plate shall be 110 HV 30 to 165 HV 30 measured in accordance with ISO 6507-1. The thickness of the test plate shall conform to the values given in Table 2. 4.2.1.2 Test proce
43、dure The sample screw (coated or uncoated, as received) shall be driven into the test plate until a thread of full diameter is completely through the test plate. Axial forces and rotational speeds as specified in Table 2 shall be applied for the drilling and screwing-in-test. 4.2.2 Inspection of the
44、 drilled hole Subject to mutual agreement, an inspection of the drilled hole may also be carried out. For this purpose, test plates in accordance with 4.2.1.1 but with thicknesses as given in Table 3 shall be used. The test plate shall be centered with a light punch mark at the spot to be drilled. A
45、fter the test plate has been drilled through, the maximum size of the drilled hole shall not exceed the limits specified in Table 3. Figure 2 illustrates a suitable testing arrangement as an addition to the test fixture illustrated in Figure 1. The inside diameter of the bush shall be approximately
46、0,25 mm larger than the outside diameter of the screw thread. The length of the bush shall be selected in such a way that the drilling point protrudes out of the bush. The axial forces specified in Table 2 can also be regarded as guideline values for the application of drilling screws. If these valu
47、es are substantially exceeded, the drilling points may be partially destroyed by fracture or burning up. EN ISO 10666:1999 BSI 03-20003 Table 2 Test data for the drilling and screwing-in-test Figure 1 Test fixture for the drilling and screwing-in-test Thread Thickness of test platea Axial forceTest
48、duration Rotational speed of screw under load mmNmax.min1 s ST 2,90,7 + 0,7 = 1,415031 800 to 2 500 ST 3,51 + 1 = 215041 800 to 2 500 ST 4,21,5 + 1,5 = 325051 800 to 2 500 ST 4,82 + 2 = 425071 800 to 2 500 ST 5,52 + 3 = 5350111 000 to 1 800 ST 6,32 + 3 = 5350131 000 to 1 800 a The thickness of the t
49、est plate may be achieved by placing two steel sheets on top of one another. These values apply to the acceptance test only. EN ISO 10666:1999 4 BSI 03-2000 Table 3 Test data for the drilled hole 4.2.3 Torsional test The drilling screw to be tested shall be clamped in a split clamping device with a female screw thread, or in an equivalent testing device in such a way that the clamped portion of the drilling screw is not damaged. Figure 3 illustrates an example of a testing appliance. After clamping, at l