1、BRITISH STANDARD AEROSPACE SERIES BS EN 2897:1996 Screws, pan head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated Classification: 1100MPa (at ambient temperature)/235 C The European Standard EN 2897:1996 has the status of a British Standard ICS 4
2、9.040.20BS EN 2897:1996 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comesintoeffect on 15December1996 BSI 11-1998 The following BSI references relate to the work on this standard: Commit
3、tee reference ACE/12 Draft for comment 88/76217 DC ISBN 0 580 26352 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: As
4、sociation of Electronic, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Amendments issued since publication Amd. No. Date CommentsBS EN 2897:1996 BSI 11-1998 i Contents Page Committees responsibl
5、e Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Required characteristics 3 4 Designation 6 5 Marking 6 6 Technical specification 6 7 Oversized bolts 6 Figure 1 4 Table 1 5 Table 2 6 Table 3 6 Table 4 6 List of references Inside back coverBS EN 2897:1996 ii B
6、SI 11-1998 National foreword This British Standard has been prepared by Technical Committee ACE/12 and is the English language version of EN2897:1996 Aerospace series Screws, pan head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmium plated Classification:
7、 1 100MPa (at ambient temperature)/235C published by the European Committee for Standardization (CEN). EN 2897:1996 was produced as a result of international discussions in which the United Kingdom took an active part. A British Standard does not purport to include all the necessary provisions of a
8、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. Cross-references Publication referred to Corresponding British Standard ISO 3353:1992 BS 2A 231:1993 Rolled threads for bo
9、lts, lead and runout requirements ISO 5855-2:1988 BS 6293 Aerospace. MJ threads Part 2:1994 Limit dimensions for bolts and nuts ISO 7689:1988 BS A 300:1989 Specification for procurement of alloy steel bolts with strength classification 1 100MPa and MJ threads ISO 7913:1994 BS 2A 296:1995 Bolts and s
10、crews, metric. Tolerances of form and position ISO 7994:1985 BS A 297:1987 Specification for internal drive, offset cruciform recess (Torq-set ) for rotary fastening devices. Metric series EN 2000:1991 BS EN 2000:1992 Quality assurance. EN aerospace products. Approval of the quality system of manufa
11、cturers EN 2424:1995 BS EN 2424:1995 Marking of aerospace products EN 3042:1991 BS EN 3042:1992 Quality assurance. EN aerospace products. Qualification procedures Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 6, an inside
12、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 theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2897 July 1996 ICS 49.040.20 Descriptors: Aircraft in
13、dustry, screw, cheese head screw, cross recessed screw, alloy steel, specification, dimension, dimensional tolerance, surface treatment, designation, marking English version Aerospace series Screws, pan head, offset cruciform recess, close tolerance normal shank, short thread, in alloy steel, cadmiu
14、m plated Classification: 1100MPa (atambient temperature)/235C Srie arospatiale Vis tte cylindrique empreinte cruciforme dporte, tige normale tolrance serre, filetage court, en acier alli, cadmines Classification: 1 100MPa ( temprature ambiante)/235C Luft- und Raumfahrt Flachkopf-Paschrauben mit Flge
15、lkreuzschlitz, kurzes Gewinde, aus legiertem Stahl, verkadmet Klasse: 1100MPa (bei Raumtemperatur)/235C This European Standard was approved by CEN on 1996-06-29. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
16、 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. This European Standard exists in three official versions (English, French, Ger
17、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,
18、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 1996 C
19、opyright reserved to CEN members Ref. No. EN 2897:1996 EEN 2897:1996 2 BSI 11-1998 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 h
20、as 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 latest by
21、January1997, and conflicting national standards shall be withdrawn at the latest by January1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, Franc
22、e, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN 2897:1996 BSI 11-1998 3 1 Scope This standard specifies the characteristics of screws, pan head, offset cruciform recess, close tolerance normal shank, short t
23、hread, in alloy steel, cadmium plated. Classification: 1 100MPa 1) /235 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 ar
24、e 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 undated references the latest edition of the publication referred to applies. ISO 3353, Aerospace Ro
25、lled threads for bolts Leadand runout requirements. ISO 5855-2, Aerospace MJ threads Part2:Limit dimensions for bolts and nuts. ISO 7689, Aerospace Alloy steel bolts with strength classification 1100MPa and MJ threads Procurement specification. ISO 7913, Aerospace Bolts and screws, metric Tolerances
26、 of form and position. ISO 7994, Aerospace Internal drive, offset cruciform recess (Torq-Set ) for rotary fastening devices Metric series. EN 2000, Aerospace series Quality assurance - ENaerospace products Approval of the quality system of manufacturers. EN 2133, Aerospace series Cadmium plating of
27、steels, with maximum specified tensile strength equal to or less than 1450MPa, copper, copper alloys and nickel alloys 3) . EN 2424, Aerospace series Marking of aerospace products. EN 3042, Aerospace series Quality assurance ENaerospace products Qualification procedure. EN 4016, Aerospace series Ove
28、rsized bolts 4) . TR 3775, Aerospace series Bolts and pins National materials 5) . 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 IS
29、O 7913 3.3 Materials TR 3775 (alloy steel, strength class 1 100 MPa) 3.4 Surface treatment EN 2133, 6 m to 10 m, on all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces, a continuous deposit shall be present, but no value is specified. Black colour option: code B 1) Mi
30、nimum tensile strength 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 Stan
31、dard at the date of publication of this standard 4) Published as AECMA Prestandard at the date of publication of this standard 5) Published as AECMA Technical Report at the date of publication of this standardEN 2897:1996 4 BSI 11-1998 Figure 1EN 2897:1996 BSI 11-1998 5 Table 1 Diameter code Thread
32、a D 1 D 2 D 3 D 4 D 5 E nom. Tol. min. nom. Tol. H13 nom. Tol. 030 MJ3 0,5 - 4h6h 3 0,006 0,031 6 4,7 2,3 1,8 040 MJ4 0,7 - 4h6h 4 0,010 0,035 8 6,7 3 1,1 2,4 050 MJ5 0,8 - 4h6h 5 10 8,7 3,4 0,5 1,5 3 060 MJ6 1 - 4h6h 6 12 10,7 4,2 3,6 070 MJ7 1 - 4h6h 7 0,013 0,038 14 12,7 5,2 1,9 4,2 080 MJ8 1 - 4
33、h6h 8 16 14,7 6,2 4,8 100 MJ10 1,25 - 4h6h 10 20 18,7 7,9 2,4 6 120 MJ12 1,25 - 4h6h 12 0,016 0,041 24 22,7 9,8 7,2 0 03 , 0 0,5 0 0,2 0 0,3 Diameter code L1 0,2 bc L 2 L 3 R S Mass d Code nom. nom. Tol. max. min. e f 030 002 to 030 2 to 30 6 0,4 1,2 0,3 0,67 0,06 040 002 to 040 2 to 40 7,5 5 1,6 0,
34、4 1,63 0,10 050 003 to 050 3 to 50 9 6 0,5 2 0,5 3,31 0,15 060 003 to 060 3 to 60 10 7 0,7 2,4 0,6 5,47 0,22 070 004 to 070 4 to 70 11 2,8 0,7 9,36 0,30 080 004 to 080 4 to 80 11,5 7,5 3,2 0,8 12,76 0,40 100 005 to 100 5 to 100 14,5 9 0,8 4 1 25,12 0,61 120 006 to 120 6 to 120 16 10 0,9 4,8 1,2 44,3
35、9 0,89 a In accordance with ISO5855-2, except the thread major diameter “d max.” which shall be equal to D 1min. 0,025. b Increments: 1 for L 1 30 2 for 30 100 c If greater lengths are required, they shall be chosen using the above increments. The length code corresponds to the length L 1 , complete
36、d by one or two zeros to the left, where necessary, to obtain a three digit code. d Approximate values (kg/1000 pieces), calculated on the basis of 7,85kg/dm 3 , given for information purposes only. They apply to screws without hole. e Value for head and first L 4 f Increase for each additional mill
37、imetre of L 4 . 0 02 , 0 03 , EN 2897:1996 6 BSI 11-1998 4 Designation EXAMPLE: NOTEIf necessary, the code 19005 shall be placed between the description block and the identity block. Table 2 Table 3 5 Marking See Table 4 and Figure 1, indented. Table 4 6 Technical specification ISO 7689, with the fo
38、llowing modifications: 6.1 Approval of manufacturers EN 2000 6.2 Qualification of screws EN 3042 6.3 Requirements deleted Cold rolling; Double shear strength; Tension fatigue strength; Head to shank fillet work effect. 7 Oversized bolts EN 4016 Hole Code with D without (hyphen) Drive Code ISO 7994 R
39、 ISO 7994 unribbed A Diameter code EN 2424 Style 030 and 040 N 050 to 120 C + MJBS EN 2897:1996 BSI 11-1998 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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