1、BRITISH STANDARD AEROSPACE SERIES BS EN 2649:1995 Screws, pan head, slotted, threaded to head, in alloy steel, cadmium plated Classification: 900MPa (at ambient temperature)/235 C The European Standard EN2649:1995has the status of a British StandardBSEN2649:1995 This British Standard, having been pr
2、epared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15September1995 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment88/76216 DC ISBN 0 580 2
3、4004 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, upon which the following bodies were represented: Association of Electronics, Telecommunications and Business Equip
4、ment Industries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBSEN2649:1995 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scop
5、e 3 2 Normative references 3 3 Required characteristics 3 4 Designation 5 5 Marking 6 6 Technical specification 6 Figure 1 4 Table 1 5 Table 2 6 List of references Inside back coverBSEN2649:1995 ii BSI 11-1999 National foreword This British Standard has been prepared by Technical Committee ACE/12and
6、 is the English language version of EN2649:1995, Aerospace series Screws, pan head, slotted, threaded to head, in alloy steel, cadmium plated Classification:900MPa (at ambient temperature)/235 C, published by the European Committee for Standardization (CEN). EN2649:1995was produced as a result of in
7、ternational discussions in which the United Kingdom took an active part. The British Standards corresponding to the European Standards referred to in the text are identical in number and title with those given in clause 2, with the exception of EN2133, EN2205, EN2438, EN2444and TR3775, for which no
8、corresponding British Standards exist. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cr
9、oss-references Publication referred to Corresponding British Standard ISO 3353:1992 BS 2A231:1993 Rolled threads for bolts. Lead and runout requirements ISO5855-2:1988 BS6293 Aerospace MJ threads Part2:1994 Limit dimensions for bolts and nuts ISO7689:1988 BS A300:1989 Specification for procurement o
10、f alloy steel bolts with strength classification1100MPa and MJ threads ISO 7913:1985 BS A296:1986 Specification for tolerances of form and position for bolts and screws. Metric series Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pa
11、ges2to 6, an inside back cover 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2649 July 1995 ICS 49.040.20 Des
12、criptors: Aircraft industry, aircraft equipment, cheese head, screw, slotted head screw, alloy steel, cadmium, screw thread, specification, characteristic, dimension, mass, dimensional tolerance, surface treatment, designation, marking English version Aerospace, series Screws, pan head, slotted, thr
13、eaded to head, in alloy steel, cadmium plated Classification: 900MPa (at ambient temperature)/235 C Srie arospatiale Vis tte cylindrique fendue, filetes jusqu proximit de la tte, en acier alli, cadmies Classification: 900MPa ( temprature ambiante)/235 C Luft- und Raumfahrt Flachkopfschrauben mit Sch
14、litz, Gewinde annhernd bis Kopf, aus legiertem Stahl, verkadmet Klasse: 900MPa (bei Raumtemperatur)/235 C This European Standard was approved by CEN on1995-01-14. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standar
15、d 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 to any CEN member. The European Standards exist in three official versions (English, French, Ger
16、man). 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 versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France,
17、Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995Co
18、pyright reserved to CEN members Ref. No. EN 2649:1995EEN2649:1995 BSI 11-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this standard has
19、successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a National Standard, either by publication of an identical text or by endorsement, at the
20、latest by January1996, and conflicting national standards shall be withdrawn at the latest by January1996. According to the Common CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ice
21、land, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom.EN2649:1995 BSI 11-1999 3 1 Scope This standard specifies the characteristics of screws, pan head, slotted, threaded to head, in alloy steel, cadmium plated. Classification: 900MPa 1) /2
22、35 C 2) 2 Normative references 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, subsequent amendments to or
23、 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. ISO 3353, Aerospace Rolled threads for bolts Lead and runout requirements. ISO 5855-2, Aer
24、ospace MJ threads Part2: Limit dimensions for bolts and nuts. ISO 7689, Aerospace Alloy steel bolts with strength classification1100MPa and MJ threads Procurement specification. ISO 7913, Aerospace Bolts and screws, metric Tolerances of form and position. EN 2000, Aerospace series Quality assurance
25、EN aerospace products Approval of the quality system of manufacturers. EN 2133, Cadmium plating of steels with maximum specified tensile strength equal to or less than1450MPa and copper and copper alloys Aerospace series 3) . EN 2424, Aerospace series Marking of aerospace products. TR 3775, Aerospac
26、e series Bolts and pins National materials 4) . 3 Required characteristics 3.1 Configuration Dimensions Masses See Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. 3.2 Tolerances of form and position ISO7913, Figure 1 and Table 1 3.3 Mat
27、erials TR3775 (alloy steel, classification: 900MPa) 3.4 Surface treatment EN2133, 8m to14m, on all surfaces which can be contacted by a20mm diameter ball. On all other surfaces, a continuous deposit shall be present, but no value is specified. Black colour option: code B 1) Minimum tensile strength
28、of the material at ambient temperature 2) Maximum temperature that the screw can withstand without continuous change in its original characteristics, after return to ambient temperature. The maximum temperature is determined by the surface treatment. 3) Published as AECMA Standard at the date of pub
29、lication of this standard 4) Published as AECMA Technical Report at the date of publication of this standardEN2649:1995 4 BSI 11-1999 Figure 1 EN2649:1995 BSI 11-1999 5 Table 1 Table 1 4 Designation EXAMPLE: NOTEIf necessary, the code19005shall be placed between the description block and the identit
30、y block. Diameter code Thread a D 1 D 2 D 3 E F G H min. nom. Tol. nom. Tol. min. min. nom. Tol. 016 MJ1,60,35 4h6h 3,2 1,9 1,1 1 0,4 0,4 0,45 020 MJ20,4 4h6h 4 2,7 1,4 1,2 0,5 0,5 0,55 025 MJ2,50,45 4h6h 5 3,7 1,9 1,5 0,6 0,6 0,65 030 MJ30,5 4h6h 6 4,7 2,3 1,8 0,7 0,7 0,85 035 MJ3,50,6 4h6h 7 5,7 2
31、,7 2,1 0,8 0,8 0,95 040 MJ40,7 4h6h 8 6,7 3 2,4 1 1 1,05 050 MJ50,8 4h6h 10 8,7 3,4 0,5 3 1,2 1,2 1,25 060 MJ61 4h6h 12 10,7 4,2 3,6 1,5 1,5 1,65 Diameter code L 0,3L bc R S T Mass d Code nom. max. min. e f 016 004 to 022 4 to 22 0,3 0,7 0,2 0,08 0,100 0,023 020 004 to 028 4 to 28 0,8 0,1 0,176 0,03
32、7 025 004 to 036 4 to 36 1 0,3 0,12 0,321 0,060 030 004 to 042 4 to 42 0,4 1,2 0,15 0,524 0,088 035 006 to 050 6 to 50 1,4 0,4 0,17 0,91 0,12 040 006 to 056 6 to 56 1,6 0,2 1,29 0,15 050 008 to 070 8 to 70 0,5 2 0,5 0,25 2,61 0,25 060 010 to 084 10 to 84 0,7 2,4 0,6 0,3 4,54 0,35 a In accordance wit
33、h ISO 5855-2 b Increments: 2 for L k 100 4 for L 100 c If greater lengths are required, they shall be chosen using the above increments. The length code corresponds to the length L, completed by one or two zeros to the left, where necessary, to obtain a three digit code. d Approximate values (kg/100
34、0 pieces), calculated on the basis of 7,85 kg/dm 3 , given for information purposes only e Value for head and first L f Increase for each additional 2 mm of L. 0 0,3 0 0,5 0 0,2 +0,15 0 +0,25 0 0 0,3 0 0,2EN2649:1995 6 BSI 11-1999 5 Marking See Table 2, plus MJ, and Figure 1. Table 2 6 Technical spe
35、cification ISO7689, with the following modifications: 6.1 Approval of manufacturers EN2000 6.2 Other modified requirements Hardness at the end of the thread, apply: in Brinell: 269/321HBS, in Vickers: 284/340 HV 30; Inspection for discontinuities shall be carried out during the microstructure inspec
36、tion. 6.3 Requirements deleted Qualification of screws; Tensile strength; Double shear strength; Tension fatigue strength; Head to shank fillet work effect. Diameter code EN 2424 Style 016 to 035 G 040 to 060 F (indented)BSEN2649:1995 BSI 11-1999 List of references See national foreword.BS EN 2649:1
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