1、CEN EM*2949 95 3404589 O323654 Lb2 D BRITISH STANDARD AEROSPACE SERIES Screws, 100“ countersunk head, offset cruciform recess, threaded to head, in heat resisting steel FE-PA92HT (A 286), silver plated - Classification: 900 MPa (at ambient temperature)/65O0C The European Standard EN 2940 : 1995 has
2、the status of a British Standard ICs 49 040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGBr LAW BS EN 2940 : 1996 CEN EN*2940 95 3404589 O323655 OT9 m BS EN 2940 : 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Techn
3、ical Committee ACW12, Aerospace fasteners and fastening systems, upon which the following bodies were represented Association of Electronics, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Ltd. T
4、his British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 Apd 1996 O BSI 1996 Amendments issued since publication Arnd.No. Date I The following BSI references relate to the work
5、 on this standard Committee reference ACW12 Draft for comment W6307 DC ISBN O 580 25617 4 CEM EN+2940 %5 U 3YwW39 0123h56 T35 BS EN 2940 : 1996 Contents Page Committees responsible Inside front cover National foreword 11 Foreword 2 Specification 1 Scope 2 Normative references 3 Requiredcharacteristi
6、cs 4 Designation 6 Markjng 6 TechnicalsDecification O ES1 1996 i CEN EN*29i60 45 U 3404583 CIL23657 971 BS EN 2940 : 1996 National foreword This British Standard has been prepared by Technical Committee ACW12 and is the English language version of EN 2940 : 1995Amspace series - Screws, 100“ counters
7、unk head, offset m.u$form recess, threaded to had, in heat resisting steel FE-PA92HT (A286), silverplated - Classification: 900 MPa (at ambient temperature)/65OoC, published by the European Committee for Standardization (CEN). EN 2840 : 1995 was produced as a result of international discussions in w
8、hich the United Kingdom took an active part. Cross-references 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 EN 2398, EN 2399, EN 2424, EN 2786 and EN 3043 for which no corres
9、ponding British Standards exist. The British Standards corresponding to the international standards referred to in the text are as follows. Publication referred to Corresponding British Standard BS 2A 231 : 1993 RoUed threads for bolts -Lead and runout requirements BS 6293 Aerospace - MJ threads Par
10、t 2 : 1994 Limit dimensions for bolts and nuts BS A 297 : 1987 Specification for internal drive, offset cruciform recess (Torq-Set (RI) for rotarg fastening devices -Metric series IS0 3353 : 1992 IS0 58552 : 1988 IS0 7994 : 1985 Compliance with a British Standard does not of itself confer immunity f
11、rom legal obligations. O BSI 1996 CEN ENa2940 95 m 31)04589 0323658 808 EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE NORM EN 2940 October 1995 ICs 49.040 Descriptors: Aircraft industry, fastener, screw, countersunk head screw, cross-recessed screw, heat resistant steel, silver coating, classificati
12、on, chension, surface treatment, screw thread, designation English version Aerospace series - Screws, 100“ countersunk head, offset cruciform recess, threaded to head, in heat resisting steel FE-PA92HT (A286), silver plated - Classification: 900 MPa (at ambient temperature)/65O0C Srie arospatiale -
13、Vis tte fraise 100“ empreinte cruciforme dporte, filetes sous tte, en acier rsistant chaud FE-PA92HT (A286), argentes - Classification: 900 MPa ( temprature ambiante)/65O0C Raumtemperatur)/65O0C Luft- und Raumfahrt - 100“ Senkschrauben, Flgelkreuzschlitz, Gewinde bis Kopf, aus hochwarmfestem Stahl F
14、E-PA92HT (A286), versilbert - Klasse: 900 MPa (bei This European Standard was approved by CEN on 1995-04-13. 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 alterat
15、ion. 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. This European Standard exists in three official versions (English French, German). A version in any other language made by translati
16、on 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, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, N
17、etherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fur Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 AU rights of reproduction and communication in any fo
18、rm and by any means reserved in all countries to CEN and its members Ref. No. EN 2940 : 1995 E CEN EN*274O 75 m 3404587 0123657 744 m Page 2 EN 2940 : 1995 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturem Afer inquiries and votes carried out in
19、accordance with the rules of this Association, this Standard has 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 shaU be given the status of a national standard, eithe
20、r by publication of an identical text or by endorsement, at the latest by Aprii 1996, and conflicting national standards shall be withdrawn at the latest by Apd 1996. According to the CENICENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Be
21、lgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. (AECMA). O BSI 1996 CEN EN*294O 95 3404589 0123660 4bb Page 3 EN 2940 : 1995 1 Scope This standard specifies the characteristics of screws
22、 with 1 OOo countersunk head with offset cruciform recess, threaded to head, in FE-PA92HT, silver plated, for aerospace applications. Classification : 900 MPa ) I650 OC 2, 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. The
23、se normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undat
24、ed references the latest edition of the publication referred to applies. IS0 3353 Aerospace - Rolled threads for bolts - Lead and runout requirements IS0 5855-2 Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts IS0 7994 Aerospace - Internal drive, offset cruciform recess (Torq-Se
25、t i for rotary fastening devices - Metric series EN 2398 Heat resisting steel FE-PA92-HT - R, 2 900 MPa - Bars for machined bolts - D I 25 mm - Aerospace series 3, EN 2399 Heat resisting steel FE-PA92-HT - R, 2 900 MPa - Bars for forged bolts - D S 25 mm - Aerospace series 3, EN 2424 EN 2786 Aerospa
26、ce series - Marking of aerospace products Aerospace series - Electrolytic silver plating of fasteners 4, EN 3043 Aerospace series - Fasteners, externally threaded, in heat resisting steel FE-PA92HT (A2861 - Classification : 900 MPa / 650 OC - Manufacturing method optional - Technical specification 4
27、, 3 Required characteristics 3.1 Configyration - Dimensions - Tolerances - Masses See figure 1 and tables 1 and 2. Dimensions and tolerances are in millimetres. They apply after silver plating. 3.2 Materials EN 2398 or EN 2399 3.3 Surface treatment EN 2786 Thickness : - thread : 3 pm to 6 pm shall b
28、e measured at the pitch diameter ; - other areas may show complete coverage, without thickness requirement. 1) Minimum tensile strength of the material at ambient temperature 2) Maximum test temperature of the parts 3) Published as AECMA Standard at the date of publication of this standard 4) Publis
29、hed as AECMA Prestandard at the date of publication of this standard - CEN EN*2LiO 95 1111 3404589 OL2366L 3T2 Thread D E2) F 0 H2) K P Q R W Recair O number Code Designation f O, 13 min. min. - 0.08 nom. TOI. max. mn. max. min. IS0 7994 -030 MJ3xO,5-4h6h 2.68 6 5,4 4,5 1,4 0,06 0,63 2.3 O 2.4 2.15
30、R3 , 040 W4x0,7-4h6h 3.55 8 7.2 5.78 1,9 0,08 0,93 3 -0,5 Og2 3.27 2.92 R4 O50 MJ5x0,8-4h6h 4.48 10 9 7.71 2.4 0,1 0.96 3.4 f 0,5 0.5 0.3 3.98 3.58 R5 1) In accordance with IS0 5855-2 2) Corresponds to maximum condition. - Page 4 EN 2940 : 1995 y0yR*) Values apply before silver plating. (HI- P* L-Tz
31、Lo.o8A1 Not concave Remove sharp edges 0,l to 0,4 I -Conforms to I Thread - -K Marking +cess conforms Figure 1 Table 1 Page 5 EN 2940 : 1995 Table 2 Thread code CEN EN*29YQ 95 3YOY589 QiJ23bb3 175 M Description block Page 6 EN 2940 : 1995 Identity block 4 Designation Thread code 030 and 040 050 NOTE
32、 : If necessary, the code 19005 shall be placed between the description block and the identitv block. F C 5 Marking EN 2424, style see table 3 and as indicated on figure 1. Table 3 6 Technical specification EN 3043 CEN EN*:2940 95 340a1589 Ul123bb4 DOL m BS EN 2940 : 1996 List of references See nati
33、onal foreword. CEN ENa2940 95 U 3404589 OL23bb5 T48 BS EN 2940 : 1996 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international
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