1、DEUTSCHE NORM Februarv 2000 I Drilling screws with tapping screw thread Mechanical and functional m-oDerties - EN IS0 10666 (IS0 10666 : 1999) English version of DIN EN IS0 10666 ICs 21.060.1 O This standard, together with DIN EN IS0 15480, DIN EN IS0 15481, DIN EN IS0 15482, and DIN EN IS0 15483, F
2、ebruary 2000 editions, supersedes DIN 7504, September 1995 edition. Bohrschrauben mit Blechschraubengewinde - Mechanische und funktionelle Eigenschaften (IS0 10666 : 1999) European Standard EN IS0 10666 : 1999 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword
3、 This standard has been published in accordance with a decision taken by CEN/TC 185 to adopt, without alteration, International Standard IS0 10666 as a European Standard. The responsible German body involved in its preparation was the Normenausschuss Mechanische Ver- bindungselemente (Fasteners Stan
4、dards Committee). The DIN Standards corresponding to the International Standards referred to in clause 2 of the EN are as follows: IS0 Standard DIN Standard IS0 1478 IS0 2702 IS0 4042 IS0 15330 DIN EN IS0 1478 DIN EN IS0 2702 DIN EN IS0 4042 DIN EN IS0 15330 Amendments DIN 7504, September 1995 editi
5、on, has been superseded by the specifications of EN IS0 10666, which is identical to IS0 10666. Previous editions DIN 7504: 1982-1 1, 1992-02, 1995-09 National Annex NA Standards referred to (and not included in Normative references and Annex ZA) DIN EN IS0 1478 DIN EN IS0 2702 DIN EN IS0 4042 DIN E
6、N IS0 15330 Tapping screw threads (IS0 1478 : 1999) Heat-treated steel tapping screws - Mechanical properties (IS0 2702 : 1992) Fasteners - Electroplated coatings (IS0 4042 : 1999) Fasteners - Preloading test for the detection of hydrogen embrittlement - Parallel bearing surface method (IS0 15330 :
7、1999) EN comprises 8 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN EN IS0 10666 : 2000-0 Y Deutsches Institut frNonunge. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, s the exclusive right of sale for German Standards (DIN-Normen). English pri
8、ce group 08 Sales No. 1108 05.00 COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesCOPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 10666 Septem
9、ber 1999 ICs 21.060.1 O English version Drilling screws with tapping screw thread Mechanical and functional properties (IS0 10666 : 1999) Vis autoperceuses avec filetage de vis tle - Caractristiques mcaniques et fonctionnelles funktionelle Eigenschaften (IS0 10666 : 1999) Bohrschrauben mit Blechschr
10、auben- gewinde - Mechanische und (IS0 10666 : 1999) This European Standard was approved by CEN on 1999-07-1 6. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alter
11、ation. Up-to-date lists and bibliographical references concerning such national stand- ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by trans
12、lation 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, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Irela
13、nd, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1999. CEN - All rights of
14、exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN IS0 10666 : 1999 E COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 2 EN IS0 10666 : 1999 Foreword International Standard IS0 10666 : 1999 which w
15、as prepared by ISO/TC 2 Fasteners of the International Organization for Standardization, has been adopted by Technical Committee CEN/TC 185 Threaded and non-threaded mechanical fasteners and acces- sories, the Secretariat of which is held by DIN, as a European Standard. This European Standard shall
16、be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by March 2000 at the latest. In accordance with the CENKENELEC Internal Regulations, the national standards organizations of the follow- ing countri
17、es are bound to implement this European Standard: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. Drilling screws with tapping screw thread - M
18、echanical and functional properties, Endorsement notice The text of the International Standard IS0 10666 : 1999 was approved by CEN as a European Standard without any modification. NOTE: Normative references to international publications are listed in Annex ZA (normative). 1 Scope This International
19、 Standard specifies the properties of heat treated screws with a tapping screw thread in accordance with IS0 1478, and which are designed with a drilling point which automatically drills the core hole for the screw during assembly. Such screws then automatically form the mating screw thread, either
20、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 the screws are able to drill their core hole and form their mating screw thread without becoming distorted or fract
21、uring in the process, provided that no overstressing has occurred. Consequently the following characteristics are regarded as representing the most important aspects for the assessment of the mechanical and operational characteristics of a drilling screw: - surface hardness; - capability of core hol
22、e 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 text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or
23、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 recent editions of the normative documents indicated below. For undated references, the latest edition of the n
24、ormative document referred to applies. Members of IS0 and IEC maintain registers of currently valid International Standards. IS0 1478:1999, Tapping screw thread. IS0 4042: 1999, Fasteners - Electroplated coatings. IS0 6507-1 :1997, Metallic materials - Vickers hardness test - Part 7: Test method. IS
25、0 15330:1999, Fasteners - Preloading test for the detection of hydrogen embrittlement - Parallel bearing surface method. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 3 EN IS0 10666 : 1999 Thread ST 2,9 and ST 3,5 ST 4.2 to ST 5,5 ST 6,3 3 Re
26、quirements 3.1 Material Case hardening steel or heat treatable steel shall be 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
27、after heat treatment shall be - 320 HV 5 to 400 HV 5 for threads s ST 4,2 and - 320 HV 10 to 400 HV 10 for threads ST 4,2 including a recommended minimum tempering temperature of 330 OC. The tempering temperature range 275 “C to 315 “C shall be avoided in order to minimize the risk of tempered marte
28、nsite embrittlement. Case depth mm min. max. 0,05 0,18 0,io 0,23 0,15 0,28 3.2.3 Case depth The case depth shall conform to the values given in Table 1 3.2.4 Microstructure The microstructure of drilling screws shall not exhibit any ferrite streaks between the surface zone and the core after heat tr
29、eatment. 3.2.5 Hydrogen embrittlement For electroplated drilling screws there is a risk of failure due to hydrogen embrittlement. Therefore steps shall be taken by the manufacturer and/or the electroplater to manage the risk including test detection in accordance with IS0 15330. In this connection I
30、S0 4042, in which measures for hydrogen embrittlement relief are described for electroplated fasteners. shall also be consulted. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 4 EN IS0 10666 : 1999 3.3 Mechanical properties 3.3.1 Core hole dri
31、lling 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 capability Drilling screws shall be able to form a matin
32、g 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 .I. 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
33、 4.2.3, shall equal or exceed the minimum torque values given in Table 4 for the applicable screw th reads. 4 Testing 4.1 Testing of metallurgical properties 4.1.1 Testing of surface hardness The surface hardness shall be tested by a Vickers procedure as specified in IS0 6507-1. The indentation shal
34、l 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 hardness The core hardness shall be tested on a transverse micro-section by a with Vickers method as specified in IS0 6507-1. 4.1.3 Measuring the case depth The case depth shall be
35、 measured microscopically on a longitudinal micro-section at the thread flank mid-point between crest and root or, in the 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
36、 on the thread profile of a properly prepared metallographic specimen. The case depth shall be the point at which the recorded 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 mechanica
37、l properties 4.2.1 Drilling and screwing-in-test 4.2.1.1 Test fixture Figure 1 illustrates an example of a suitable test 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 accor
38、dance with IS0 6507-1. The thickness of the test plate shall conform to the values given in Table 2. COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 5 EN IS0 10666 : 1999 4.2.1.2 Test procedure The sample screw (coated or uncoated, as received)
39、 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 drilled hole Subject to mutual agreement, an inspectio
40、n 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. After the test plate has been drilled through, the maxim
41、um 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 0,25 mm larger than the outside diameter of the screw t
42、hread. The length of the bush shall be selected in such a way that the drilling point protrudes out of the bush. Key 1 Test plate I I I l=l I Figure 1 -Test fixture for the drilling and screwing-in-test COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling Servic
43、esPage 6 EN IS0 10666 : 1999 ST 4,2 ST 4,8 Table 2 - Test data for the drilling and screwing-in-test 1.5 + 1,5 = 3 2+2=4 Thread Thickness of test platea ST 2,9 0,7 + 0,7 = 1,4 ST 6,3 2+3=5 Thread ST 2,9 ST 3,5 ST 4,2 Axial force Test duration 4-L Plate thickness Hole diameter mrn mm min. max. 1 22 2
44、s 1 2,7 3,o 2 32 3,6 +- 250 ST 4,8 ST 5,5 ST 6,3 Rotational speed of screw under load min- 2 3,7 42 2 42 48 2 43 5,4 1 800 to 2 500 1 800 to 2 500 1 800 to 2 500 1 800 to 2 500 1 O00 to 1 800 1 O00 to 1 800 I a The thickness of the test plate may be achieved by placing two steel sheets on top of one
45、 another. These values apply to I the acceptance test only. The axial forces specified in Table 2 can also be regarded as guideline values for the application of drilling screws. If these values are substantially exceeded, the drilling points may be partially destroyed by fracture or burning up. Key
46、 1 bush 2 test plate 3 drilled hole Figure 2 -Test arrangement for the drilling test Table 3 -Test data for the drilled hole COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 7 EN IS0 10666 : 1999 Thread 4.2.3 Torsional test Minimum torsional str
47、ength N.m 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
48、 least two pitches of the screw thread must protrude above the clamping device, and at least two pitches of the screw thread (without the drilling point) must be firmly clamped in the device or testing appliance. In the case of short drilling screws, the complete screw thread shall be firmly clamped
49、, but the screw head shall not rest on the face of the clamping device. ST 2,Q ST 3.5 By means of a suitably calibrated torque-measuring device, torque shall be applied to the screw until failure occurs. The screw shall meet the minimum torsional strenghts given in Table 4. 1,s 2.8 Key 1 Insert with tapped blind hole ST 4,2 Figure 3 -Testing appliance for torsional test ST 4,8 ST 5,5 ST 6,3 69 10,4 16,9 COPYRIGHT DIN DEUTSCHES Institut Fur Normung E.V.- EnglishLicensed by Information Handling ServicesPage 8 EN IS0 10666 : 1999 5 Torque wrenches Torque wrenches used in torsio
