1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 7048:2011Cross-recessed cheese headscrewsBS EN ISO 7048:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 7048:2011. It sup
2、ersedes BS EN ISO 7048:1999, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e F M E / 9 / 3 , F a s t e n e r s - P r o d u c t S t a n d a r d s .A list of organizations represented on this committee can be obtained on request to its se
3、cretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 71154 1 ICS 21.060.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was
4、 published under the authority of the Standards Policy and Strategy Committee on 31 July 2011.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7048 April 2011 ICS 21.060.10 Supersedes EN ISO 7048:1998English Version Cross-recesse
5、d cheese head screws (ISO 7048:2011) Vis mtaux tte cylindrique empreinte cruciforme (ISO 7048:2011) Zylinderschrauben mit Kreuzschlitz (ISO 7048:2011) This European Standard was approved by CEN on 31 January 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipul
6、ate 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 CEN-CENELEC Management Centre or to any CEN member. This European St
7、andard 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the n
8、ational standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swit
9、zerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.
10、 EN ISO 7048:2011: EBS EN ISO 7048:2011 EN ISO 7048:2011 (E) 3 Foreword This document (EN ISO 7048:2011) 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 shal
11、l be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2011, and conflicting national standards shall be withdrawn at the latest by October 2011. Attention is drawn to the possibility that some of the elements of this docu
12、ment may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 7048:1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are
13、bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spai
14、n, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 7048:2011 has been approved by CEN as a EN ISO 7048:2011 without any modification. BS EN ISO 7048:2011ISO 7048:2011(E) ISO 2011 All rights reserved iiiForeword ISO (the International Organization for Standardization) i
15、s a worldwide federation of national standards 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 represe
16、nted on that committee. International organizations, 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 d
17、rafted in accordance with the rules given 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
18、Standard requires approval by at least 75 % 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 7048 was prepare
19、d by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 10, Product standards for fasteners. This second edition cancels and replaces the first edition (ISO 7048:1998), of which it constitutes a minor revision. BS EN ISO 7048:2011BS EN ISO 7048:2011INTERNATIONAL STANDARD ISO 7048:2011(E) ISO 2
20、011 All rights reserved 1Cross-recessed cheese head screws 1 Scope This International Standard specifies the characteristics of cross-recessed cheese head screws of product grade A, with threads from M2,5 to M8 inclusive, and with cross recesses of types H and Z. NOTE The head dimensions of these sc
21、rews are identical to those of the slotted cheese head screws in ISO 1207. If, in special cases, specifications others than those listed in this International Standard are required, they can be selected from existing International Standards, for example ISO 261, ISO 888, ISO 898-1, ISO 965-2, ISO 35
22、06-1 and ISO 4759-1. 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) applies. ISO 2
23、25, Fasteners Bolts, screws, studs and nuts Symbols and descriptions of dimensions ISO 261, ISO general purpose metric screw threads General plan ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs with specified property classes Coarse
24、thread and fine pitch thread ISO 965-2, ISO general purpose metric screw threads Tolerances Part 2: Limits of sizes for general purpose external and internal screw threads Medium quality ISO 3269, Fasteners Acceptance inspection ISO 3506-1, Mechanical properties of corrosion-resistant stainless stee
25、l fasteners Part 1: Bolts, screws and studs ISO 4042, Fasteners Electroplated coatings ISO 4757, Cross recesses for screws ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C ISO 6157-1, Fasteners Surface discontinuities Part 1: Bolts, screws and stud
26、s for general requirements ISO 8839, Mechanical properties of fasteners Bolts, screws, studs and nuts made of non-ferrous metals ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts ISO 10683, Fasteners Non-electrolytically applied zinc flake coatings BS EN ISO 7048:2011ISO 704
27、8:2011(E) 2 ISO 2011 All rights reserved3 Dimensions See Figure 1 and Table 1. The shank diameter is approximately equal to the pitch diameter or equal to the permissible major thread diameter. The symbols and descriptions of dimensions are specified in ISO 225. a) Type H b) Type Z a Edge may be rou
28、nded or flat. b As-rolled end. Figure 1 BS EN ISO 7048:2011ISO 7048:2011(E) ISO 2011 All rights reserved 3Table 1 Dimensions Dimensions in millimetres Thread, d M2,5 M3 (M3,5)aM4 M5 M6 M8 Pb0,45 0,5 0,6 0,7 0,8 1 1,25 a max. 0,9 1 1,2 1,4 1,6 2 2,5 b min. 25 25 38 38 38 38 38 max. 4,50 5,50 6,00 7,0
29、0 8,50 10,00 13,00 dkmin. 4,32 5,32 5,82 6,78 8,28 9,78 12,73 damax. 3,1 3,6 4,1 4,7 5,7 6,8 9,2 max. 1,80 2,00 2,40 2,60 3,30 3,9 5,0 k min. 1,66 1,86 2,26 2,46 3,12 3,6 4,7 r min. 0,1 0,1 0,1 0,2 0,2 0,25 0,4 x max. 1,1 1,25 1,5 1,75 2 2,5 3,2 Recess No. 1 2 2 2 2 3 3 m ref. 2,7 3,5 3,8 4,1 4,8 6,
30、2 7,7 min. 1,20 0,86 1,15 1,45 2,14 2,25 3,73 Type H Penetration max. 1,62 1,43 1,73 2,03 2,73 2,86 4,36 m ref. 2,4 3,5 3,7 4,0 4,6 6,1 7,5 min. 1,10 1,22 1,34 1,60 2,26 2,46 3,88 Cross recess Type Z Penetration max. 1,35 1,47 1,80 2,06 2,72 2,92 4,34 lcnom. min. max. Approximate mass in kilograms p
31、er 1 000 pieces (r = 7,85 kg/dm3) (for information only) 2 1,8 2,2 3 2,8 3,2 0,272 4 3,76 4,24 0,302 0,515 5 4,76 5,24 0,332 0,560 0,786 1,09 6 5,76 6,24 0,362 0,604 0,845 1,17 2,06 8 7,71 8,29 0,422 0,692 0,966 1,33 2,20 3,56 10 9,71 10,29 0,482 0,780 1,08 1,47 2,55 3,92 7,85 12 11,65 12,35 0,542 0
32、,868 1,20 1,63 2,80 4,27 8,49 16 15,65 16,35 0,662 1,04 1,44 1,95 3,30 4,98 9,77 20 19,58 20,42 0,782 1,22 1,68 2,25 3,78 5,69 11,0 25 24,58 25,42 0,932 1,44 1,98 2,64 4,40 6,56 12,6 30 29,58 30,42 1,66 2,28 3,02 5,02 7,45 14,2 35 34,5 35,5 2,57 3,41 5,62 8,25 15,8 40 39,5 40,5 3,80 6,25 9,20 17,4 4
33、5 44,5 45,5 6,88 10,0 18,9 50 49,5 50,5 7,50 10,9 20,6 60 59,05 60,95 12,7 23,7 70 69,05 70,95 26,8 80 79,05 80,95 29,8 NOTE Preferred lengths are those between the solid, bold, stepped lines. aThe size in parentheses should be avoided, if possible. bP is the pitch of the thread. cScrews with nomina
34、l lengths above the discontinuous line are threaded up to the head (b = l a). BS EN ISO 7048:2011ISO 7048:2011(E) 4 ISO 2011 All rights reserved4 Requirements and reference International Standards See Table 2. Table 2 Requirements and reference International Standards Material Steel Stainless steel
35、Non-ferrous metal General requirements International Standard ISO 8992 Tolerance class 6g Thread International Standard ISO 261, ISO 965-2 Property class 4.8, 5.8 A2-70 Mechanical propertyaInternational Standard ISO 898-1 ISO 3506-1 Materials are specified in ISO 8839. Product grade A Tolerance Inte
36、rnational Standard ISO 4759-1 Cross recesses ISO 4757 As processed As processed As processed Requirements for electroplating are specified in ISO 4042. Requirements for electroplating are specified in ISO 4042. Requirements for non-eletrolytically applied zinc flake coatings are specified in ISO 106
37、83.Finish Coating Additional requirements or other finishes or coatings shall be agreed between the supplier and the purchaser. Surface integrity Limits for surface discontinuities are specified in ISO 6157-1. Acceptability Acceptance inspection is specified in ISO 3269. aTo meet the requirements of
38、 the torsional test, fracture shall occur in the shank or the thread of the screw and not in the junction of the head and shank or the junction of the shank and recess. 5 Designation EXAMPLE A cross-recessed cheese head screw with thread M5, nominal length l = 20 mm, property Class 4.8 and cross rec
39、ess type Z is designated as follows: Cheese head screw ISO 7048 - M5 20 - 4.8 - Z BS EN ISO 7048:2011ISO 7048:2011(E) ISO 2011 All rights reserved 5Bibliography 1 ISO 888, Bolts, screws and studs Nominal lengths, and thread lengths for general purpose bolts 2 ISO 1207, Slotted cheese head screws Pro
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