1、STD.BS1 BS EN IS0 LbLb-ENGL 1999 W lb24bb 080bOL2 499 BRITISH STANDARD Drilling screws with tapping screw threads - Mechanical and functional properties The European Standard EN IS0 10666:1999 has the status of a British Standard ICs 21.060.10 BS EN IS0 10666: 1999 NO COPYING WITHOUT ES1 PERMISSION
2、EXCEPT AS PERMITTED BY COPYRIGHT LAW STD.BS1 BS EN IS0 LObLb-ENGL 1977 = 1b24bb9 DBOb01i3 325 Amd. No. Date BS EN IS0 10666:1999 Comments This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee
3、and comes National foreword This Brim Standard is the English ianguage version of EN IS0 10666:1999. It is identical with EO 10666:1999. The UK participation in its prepamtion was entrusted by Technical Committee FIVE, Bolts, nuts and accessories, to Subcommittee FME/9/2, Slotted and recessed head s
4、crews, which has the responsibility to: - aid enquirers to undeistand the text; - present to the responsible internationalEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related intemational and European developments and
5、promulgate them in the UK A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards nonnally include an annex which lists normative references to international publications with
6、 their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entithi “International Stan- Correspondence Index”, or by using the “Find” facility of the BSI Standards Electr
7、onic Catalogue. A British Standard does not purport to include ail the necessary provisions of a conira-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,
8、 Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 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 Sta
9、ndards are listed in annex ZA (normative). - STDmBSI BS EN IS0 1Obbb-ENGL 1999 D lb24bb9 OBObOLb 034 EN IS0 10666:1999 INTERNATIONAL STANDARD IS0 10666 First edition 1999-09-01 Drilling screws with tapping screw thread - Mechanical and functional properties Vis autopetceuses avec fiietage de vis tle
10、 - Caractristiques mcaniques et fonctionnelles Reference number IS0 10666:1999(?1 - STD-BSI 8s EN IS0 LObbb-ENGL 1999 Lb24bb9 080bOL7 T70 EN IS0 10666:1999 Foreword IS0 (the Intemational Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The
11、 work of preparing International Standards is normally carried out through IS0 technical cornmittees. 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-gov
12、ernmental, 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. Intemational Standards are drafted in accordance with the rules given in the ISOAEC Directives, Part 3. Dr
13、aft 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 IS0 10666 was prepared by Technical Committee ISO/TC
14、 2, Fasteners. STDaBSI BS EN IS0 LObbh-ENGL 1999 Lb24hb9 O8ObO18 907 D EN IS0 10666:1999 Drilling screws with tapping screw thread - Mechanical and functional properties 1 scope This Intemational Standard specifies the properties of heat treated screws with a tapping screw thread in accordance with
15、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 in a non-cutting or in a cutting operation, with the aid of the threaded portion of the screw adjoining t
16、he drilling point. The purpose of this Intemational Standard is to ensure that 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 characterist
17、ics 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 hole drilling and forming of the mating female screw thread; - torsional strength. 2 Normative references The
18、 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 publications do not apply. However, parties to agreements based on this Interna
19、tional 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 applies. Members of IS0 and IEC maintain registers of currently valid Intern
20、ational Standards. IS0 1478:1999, Tapping screw thread. IS0 4O42:1999, Fasteners - Electroplated coatings. IS0 6507-1 :1997, Metallic materials - Vickers hardness test - Part I: Test method. IS0 15330:1999, Fasteners - Preloading test for the detection of hydrogen embrittlement - Parallel bearing su
21、rface method. 1 _ STD-BSI BS EN IS0 LObbb-ENGL 1999 H Lb24bb9 08ObOLS 843 EN IS0 106661999 Thread ST 2,9 and ST 3,5 ST 4,2 to ST 5.5 ST 6,3 3 Requirements 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 S
22、urface hardness The minimum surface hardness of drilling screws after heat treatment shall be 530 HV 0,3. 3.2.2 Com hardness The core hardness after heat treatment shall be - 320 HV 5 to 400 HV 5 for threads s Si 4,2 and - 320 HV 10 to 400 HV 10 for threads ST 4.2 including a recommended minimum tem
23、pering temperature of 330 “C. The tempering temperature range 275 OC to 315 OC shall be avoided in order to minimize the risk of tempered martensite embnttlement. Case depth mm min. max. 0,05 0,18 0,lO 0,23 0,15 0,28 3.2.3 Camdepth The case depth shall conform to the values given in Table 1. 39.4 Mi
24、crastructum 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 embnttlement. Therefore steps shall be taken b
25、y the manufacturer andor the electroplater to manage the risk including test detection in accordance with IS0 15330. In this connection IS0 4042, in which measures for hydrogen embnttlement relief are described for electroplated fasteners, shall also be consulted. 2 - STD-BSI 8s EN IS0 IObbb-ENGL 19
26、99 = Lb24bb9 080b020 5b5 EN IS0 106661999 3.3 Mechanical properties 3.3.1 Com 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 i
27、n 4.2.1. 3.3.2 Thread forming capability 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. 3.3.3 Torsional strength Drilling screws shall have a torsional str
28、ength such that the torque necessary to cause failure, when tested in accordance with 4.2.3, shall equal or exceed the minimum toque values given in Table 4 for the applicable screw threads. 4 Testing 4.1 Testing of metallurgical properties 4.1.1 Testing of surface hardness The surface hardness shal
29、l be tested by a Vickers procedure as specified in IS0 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 hardness The core hardness shall be tested on a transverse micro-section by a with Vickers method
30、 as specified in IS0 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 the case of drilling screws up to and including ST 4,2, in the root of the thread. For referee purp
31、oses, 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 recorded hardness is 30 HV above the actual core hardness. 4.1.4 Examination of the structure The m
32、aterial 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 test fixture. The test plate shall be made from low carbon steel with a carbon content not exceeding
33、0,23 %. The hardness of the plate shall be 110 HV 30 to 165 HV 30 measured in accordance with IS0 6507-1. The thickness of the test plate shall conform to the values given in Table 2. 3 4.2.1.2 Test procedure The sample screw (coated or uncoated, as received) shall be driven into the test plate unti
34、l 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 inspection of the drilled hole may also be carried
35、 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 maximum size of the drilled hole shall not exc
36、eed 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 thread. The length of the bush shall be se
37、lected in such a way that the drilling point protrudes out of the bush. bY 1 Test plate Figure 1 - Test fixture for the drilling and screwing-in-test 4 STD.BSI BS EN IS0 LObbb-ENGL 3999 = Lb24bb 080b022 338 EN IS0 10666:1999 Thread Table 2 - Test data for the drilling and screwingin-test Rotational
38、speed of screw uner load Thickness of test platea Axlal force Test duration mm N ma. min- S ST 2,9 ST 3,5 0,7 + 0,7 = 1,4 150 3 1800to2500 1+1=2 1 50 4 18oOto25oO ST 4,2 ST 4,a ST 5,5 ST 6,3 The axial forces specified in Table 2 can also be regarded as guideline values for the application of drillin
39、g screws. If these values are substantially exceeded, the drilling points may be partially destroyed by fracture or burning up. 1,5 + 1,5 = 3 250 5 1800to2500 2+2=4 250 7 1800to2500 2+3=5 350 11 1 M)o to 1 800 2+3=5 350 13 1000to1800 Key 1 bush 2 test plate 3 drilled hole Thread ST 2,9 ST 3,5 ST 4,2
40、 ST 4,8 CT 5,5 Figure 2 - Test arrangement for the drilling test Plate thickness Hole diameter mm mrn min. max. 1 22 25 1 2,7 3,O 2 32 3,6 2 3,7 42 2 42 48 5 STD-BSI BS EN IS0 lObbb-ENGL L999 = Lb24bb9 0806023 274 EN IS0 10666:1999 ST 3,s ST 4.2 4.2.3 Torsional test 2,8 4.7 The drilling screw to be
41、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. ST 5,5 ST 6,3 Figure 3 illustrates an example of a testing appliance. After clamping, at least two pitches of
42、 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, but the screw head
43、shall not rest on the face of the clamping device. 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. 10,4 16,9 W II I Key 1 Insert with tapped blind hole Figure
44、3 - Testing appliance for torsional test Table 4 - Minimum torsional strength I Thread Minimum torsional strenath Nam I ST 2,9 I I STDDBSI BS EN IS0 lObbb-ENGL 1997 lb24bb7 080b024 100 EN IS0 10666:1999 5 Torque wrenches Toque wrenches used in torsional test shall be accurate within I3 % of the spec
45、ified toques. Alternatively, a torque sensing power device of equivalent accuracy may be used. For referee purposes a manually-operated toque wrench shall be used. 7 STD=BSI BS EN IS0 1Obbb-ENGL 1999 = 1b24bb9 OBOb025 047 = EN IS0 10666:1999 Annex ZA (normative) Normative references to international
46、 publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, s
47、ubsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. Publication - Year Ji 020 8996 9001. Fax: 020 8996 7001. in respo
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