1、BSI Standards PublicationBS EN ISO 14581:2013Fasteners Hexalobularsocket countersunk flat headscrewsBS EN ISO 14581:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO14581:2013.The UK participation in its preparation was entrusted to TechnicalCommittee FME
2、/9, Fasteners.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published b
3、y BSI StandardsLimited 2013ISBN 978 0 580 75164 6ICS 21.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September 2013.Amendments issued since publication
4、Date Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14581 September 2013 ICS 21.060.10 English Version Fasteners - Hexalobular socket countersunk flat head screws (ISO 14581:2013) lments de fixation - Vis tte fraise rduite six lobes internes (ISO 14581:2013) Mechanische Verbin
5、dungselemente - Senkschrauben mit Innensechsrund (ISO 14581:2013) This European Standard was approved by CEN on 24 August 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard
6、 without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any o
7、ther language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republi
8、c, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN CO
9、MMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14581:2013: EBS EN
10、ISO 14581:2013EN ISO 14581:2013 (E) 3 Foreword This document (EN ISO 14581:2013) has been prepared by Technical Committee ISO/TC 2 “Fasteners“ in collaboration with Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by DIN. This European Standard shall be given the status of
11、 a national standard, either by publication of an identical text or by endorsement, at the latest by March 2014, and conflicting national standards shall be withdrawn at the latest by March 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of p
12、atent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. 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,
13、Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey a
14、nd the United Kingdom. Endorsement notice The text of ISO 14581:2013 has been approved by CEN as EN ISO 14581:2013 without any modification. BS EN ISO 14581:2013ISO 14581:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Dimensions . 24 Requirements
15、 and reference International Standards 55 Marking 66 Designation 6Bibliography 7BS EN ISO 14581:2013ISO 14581:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standa
16、rds 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 tak
17、e part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In par
18、ticular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this d
19、ocument may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org
20、/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The committee responsible for this document is ISO/TC 2, Fasteners, Subcommittee SC 11, Fasteners with metric external thread.iv ISO 2013 All rights reservedBS EN ISO
21、 14581:2013INTERNATIONAL STANDARD ISO 14581:2013(E)Fasteners Hexalobular socket countersunk flat head screws1 ScopeThis International Standard specifies the characteristics of hexalobular socket countersunk flat head screws in product grade A and with threads from M2 to M10 inclusive and with reduce
22、d loadability according to Table 3.If, in special cases, specifications other than those listed in this International Standard are required, they can be selected from existing International Standards, e.g. ISO 261, ISO 888, ISO 898-1, ISO 965-2, ISO 3506-1 and ISO 4759-1.NOTE Countersunk head screws
23、, high head, made of steel, with property classes 4.8, 8.8 and 10.9, are specified in ISO 14582, but these products are not interchangeable, because of different head heights.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indis
24、pensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and descriptions of dimensionsISO 261, ISO general pur
25、pose metric screw threads General planISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch threadISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of
26、 sizes for general purpose external and internal screw threads Medium qualityISO 3269, Fasteners Acceptance inspectionISO 3506-1, Mechanical properties of corrosion-resistant stainless steel fasteners Part 1: Bolts, screws and studsISO 4042, Fasteners Electroplated coatingsISO 4759-1, Tolerances for
27、 fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and CISO 6157-1, Fasteners Surface discontinuities Part 1: Bolts, screws and studs for general requirementsISO 7721, Countersunk head screws Head configuration and gaugingISO 8992, Fasteners General requirements for bolts, screws,
28、studs and nutsISO 10664, Hexalobular internal driving feature for bolts and screwsISO 10683, Fasteners Non-electrolytically applied zinc flake coatingsISO 10684, Fasteners Hot dip galvanized coatingsISO 16048, Passivation of corrosion-resistant stainless-steel fasteners ISO 2013 All rights reserved
29、1BS EN ISO 14581:2013ISO 14581:2013(E)3 DimensionsSee Figure 1 and Table 1. Symbols and descriptions of dimensions are specified in ISO 225.a) Screws without shoulder for sizes M2 to M4b) Fully threaded screws with shoulder for sizes M5 to M102 ISO 2013 All rights reservedBS EN ISO 14581:2013ISO 145
30、81:2013(E)c) Partially threaded screws with shoulder for sizes M5 to M10KeyNOTE Shank diameter, ds, is approximately equal to the pitch diameter or equal to the permissible major thread diameter.aEdge of the head flat or rounded.bAs rolled end.cAny shape or size of the reinforcing feature is at the
31、discretion of the manufacturer and shall not exceed d.damax 2P.eamax 2,5P.Figure 1 Hexalobular socket countersunk flat head screw ISO 2013 All rights reserved 3BS EN ISO 14581:2013ISO 14581:2013(E)Table 1 Dimensions for hexalobular socket countersunk flat head screwsDimensions in millimetres Thread,
32、 d M2 M2,5 M3 (M3,5)aM4 M5 M6 M8 M10 without shoulder with shoulder Pb0,4 0,45 0,5 0,6 0,7 0,8 1 1,25 1,5 b min. 25 25 25 38 38 38 38 38 38 dkctheoretical max. 4,4 5,5 6,3 8,2 9,4 10,4 12,6 17,3 20 actual nom. = max. 3,80 4,70 5,50 7,30 8,40 9,30 11,30 15,80 18,30 min. 3,50 4,40 5,20 6,94 8,04 8,94
33、10,87 15,37 17,78 kcnom. = max. 1,20 1,50 1,65 2,35 2,70 2,70 3,30 4,65 5,00 r max. 0,5 0,6 0,8 0,9 1,0 1,3 1,5 2,0 2,5 x max. 1,00 1,10 1,25 1,50 1,75 2,00 2,50 3,20 3,80 Hexalobular socketdSocket No. 6 8 10 15 20 25 30 45 50 A ref. 1,75 2,40 2,80 3,35 3,95 4,50 5,60 7,95 8,95 t max. 0,64 0,79 0,83
34、 1,32 1,53 1,51 1,78 2,54 2,80 min. 0,51 0,66 0,70 1,16 1,14 1,12 1,39 2,15 2,41 lenom.amin. max. 3 2,8 3,2 4 3,76 4,24 5 4,76 5,24 6 5,76 6,24 8 7,71 8,29 10 9,71 10,29 12 11,65 12,35 (14) 13,65 14,35 16 15,65 16,35 20 19,58 20,42 25 24,58 25,42 30 29,58 30,42 35 34,5 35,5 40 39,5 40,5 45 44,5 45,5
35、 50 49,5 50,5 (55) 54,05 55,95 60 59,05 60,95 NOTE Preferred lengths are between the bold, stepped lines. aSizes in brackets should be avoided if possible. bP is the pitch of the thread. cThe gauging of head dimensions is specig976ied in ISO 7721. dThe acceptance procedure for the hexalobular socket
36、 and corresponding gauges are specig976ied in ISO 10664. eScrews with nominal lengths above the discontinuous, stepped line are threaded up to the head b = l (k + a). 4 ISO 2013 All rights reservedBS EN ISO 14581:2013ISO 14581:2013(E)4 Requirements and reference International StandardsSee Table 2 an
37、d Table 3.Table 2 Requirements and reference International StandardsMaterial Steel Stainless steelGeneral requirements International Standard ISO 8992ThreadTolerance class 6gInternational Standards ISO 261, ISO 965-2Mechanical propertiesProperty class/ steel grade4.8, 8.8aA2-50, A4-50 A2-70, A4-70Ma
38、rking symbol 04.8, 08.8A2-050, A4-050 A2-070, A4-070bInternational Standards ISO 898-1 ISO 3506-1cToleranceProduct grade AInternational Standard ISO 4759-1Hexalobular socket International Standard ISO 10664Finish null CoatingAs processed Requirements for electro-plating are specified in ISO 4042. Re
39、quirements for non-electrolytically applied zinc flake coatings are specified in ISO 10683. Requirements for hot dip galvanizing are specified in ISO 10684.Clean and bright A method for passivation is specified in ISO 16048.Additional requirements or other finishes or coatings shall be agreed betwee
40、n the supplier and the purchaser.Surface integrityLimits for surface discon-tinuities are specified in ISO 6157-1.Acceptability The acceptance procedure is specified in ISO 3269.aBecause of their head configurations, these screws might not meet the minimum ultimate tensile loads specified in ISO 898
41、-1. They shall meet the other requirements for the respective property class specified in ISO 898-1.In addition, when full-size screws are tensile tested in accordance with ISO 898-1, they shall withstand the reduced minimum ultimate tensile loads given in Table 3. When tested to the ultimate tensil
42、e load, the fracture might occur in the threaded section, the head, the shank or at the head/shank junction.bThe marking symbols for stainless steel fasteners with reduced loadability are intended to be included in the next revision of ISO 3506-1.cBecause of their head configurations, these screws m
43、ight not meet the minimum ultimate tensile loads specified in ISO 3506-1. They shall meet the other requirements for the respective steel grade specified in ISO 3506-1.In addition, when full-size screws are tensile tested in accordance with ISO 3506-1, they shall withstand the reduced minimum ultima
44、te tensile loads given in Table 3. When tested to failure, the fracture might occur in the threaded section, the head, the shank or at the head/shank junction.For reduced minimum ultimate tensile load values determined on the basis of Rm,minand As,nomaccording to property classes 50 and 70 of ISO 35
45、06-1, see Table 3. ISO 2013 All rights reserved 5BS EN ISO 14581:2013ISO 14581:2013(E)Table 3 Reduced minimum ultimate tensile loads for hexalobular socket countersunk flat head screwsThread, dProperty class4.8a8.8a50b70bReduced minimum ultimate tensile loadNM2 820 1 160M2,5 1 350 1 900M3 1 690 3 22
46、0 2 010 2 810M3,5 2 280 4 340 2 710 3 790M4 2 950 5 620 3 510 4 910M5 4 770 9 080 5 680 7 950M6 6 750 12 900 8 000 11 200M8 12 300 23 400 14 600 20 400M10 19 500 37 100 23 200 32 400a80 % of the values for Fm,minspecified in ISO 898-1.b80 % of the values for Fm,min(Rm,min As,nom). Rm,minand As,nomar
47、e specified in ISO 3506-1.5 MarkingWhen requested, screws of diameter M5 and above with reduced loadability shall be marked: for steel fasteners in accordance with ISO 898-1; for stainless steel fasteners in accordance with ISO 3506-1, but with the marking symbols specified in Table 2.6 DesignationT
48、he designation requirements for fasteners with reduced loadability shall apply for all sizes: for steel fasteners as specified in ISO 898-1; for stainless steel fasteners as specified in this International (product) Standard in addition to ISO 3506-1.EXAMPLE 1 A hexalobular socket countersunk flat h
49、ead screw with thread M5, nominal length l = 20 mm and property class 4.8 in accordance with ISO 898-1 is designated as follows:Hexalobular socket countersunk flat head screw ISO 14581 - M5 20 - 04.8EXAMPLE 2 A hexalobular socket countersunk flat head screw with thread M5, nominal length l = 20 mm, stainless steel grade A2 and property class 50 in accordance with ISO 3506-1 is designated as follows:Hexa
