1、CEN PREN*3LL2 94 m 3404589 00b2L97 8TT m AECMA STANDARD NORME AECMA AECMA NORM prEN 31 12 Edition P 2 February 1994 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 UDC : 621
2、.882.21 1 : 629.7 Supersedes issue PI February 1987 Descriptors : Aircraft industry, aircraft equipment, screw, hexagonal head screw, alloy steel, cadmium, screw thread, specification, characteristic, dimension, mass, dimensional tolerance, surface treatment, designation, marking ENGLISH VERSION Aer
3、ospace series Bolts, normal hexagonal head, threaded to head, in alloy steel, cadmium plated Classification : 900 MPa (at ambient temperature) / 235 OC Srie arospatiale Vis tte hexagonale normale, filetes jusqu proximit de ia tte, en acier alli, cadmies Classification : 900 MPa ( temprature ambiante
4、) / 235 OC Luft- und Raumfahrt Sechskantschrauben, Gewinde annhernd bis Kopf, aus legiertem Stahl, verkadmet Klasse : 900 MPa (bei Raumtemperatur) / 235 OC This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Aros
5、patial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee follo wing comment by the Member countries. Subsequent to the publication of this prestandard, the technical content shall not be changed to an
6、 extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre INPSI and formal agreement of the Official Services of the Member countries it will be submitted as a draft Europe
7、an Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra cooies can be SUDDhed bv B.N.A.E. - Technooolis 54 - 199. rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Comments should be sent within six months after the date of publication to AECMA Technopoli
8、s - 1 75, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE Edition approved for publication 1994-02-28 C3 Chairman M. Arena aecma 19: CEN PRENa3LL2 94 3404589 0062398 736 Page 2 prEN 3112 : 1994 Foreword The equivalent text of this standard was submitted for Official Services ball
9、ot until Ist July 1993. Comments received from Official Services were incorporated following decisions taken by Technical Committee C 3 during its 65th meeting on 15th October 1993. CEN PRENx3LL2 94 3404589 O062399 672 Page 3 prEN 31 12 : 1994 1 Scope This standard specifies the characteristics of b
10、olts, normal hexagonal head, threaded to head, in alloy steel, cadmium plated. Classification : 900 MPa ) / 235 OC 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
11、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 undated references the latest edition of the publication r
12、eferred to applies. IS0 3353 IS0 5855-2 IS0 7689 IS0 7913 EN 2000 EN 2133 EN 2205 EN 2424 EN 2438 EN 2444 TR 3775 Aerospace - Rolled threads for bolts - Lead and runout requirements Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts Aerospace - Alloy steel bolts with strength clas
13、sification 1 100 MPa and MJ threads - Procurement specification Aerospace - Bolts and screws, metric - Tolerances of form and position Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers Cadmium plating of steels with maximum specified tensi
14、le strength equal to or less than 1 450 MPa and copper and copper alloys - Aerospace series 3, Steel FE-PL43 S - 900 MPa I R, I 1 1 O0 MPa - Bars De 5 40 mm - Aerospace series 3, Aerospace series - Identification marking of standard fasteners 3, Steel FE-PL62 - 900 MPa I R, S 1 1 O0 MPa - Bars De I
15、40 mm - Aerospace series 3, Steel FE-PL711 - 900 MPa I 1 100 MPa - Bars and wires De I 45 mm - Aerospace series 3) Aerospace series - Bolts and pins - National materials 4, 1) Minimum tensile strength of the material at ambient temperature 2) Maximum temperature that the bolt can withstand without c
16、ontinuous 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 publication of this standard 4) Published as AECMA Technical Report at the date of publication of this
17、standard CEN PREN*3LL2 94 W 3404589 0062200 LL4 W Page 4 prEN 3112 : 1994 3 Required characteristics 3.1 See figure 1 and table 1. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. 3.2 IS0 7913 3.3 Materials EN 2205, EN 2438, EN 2444 Configuration - Dimensions
18、 - Masses Tolerances of form and position or TR 3775 (alloy steel, classification : 900 MPa) 3.4 Surface treatment EN 2133, 8 pm to 14 Am 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 co
19、lour option : code B CEN PRENx3332 94 = 3404587 0062203 050 Page 5 prEN 3112 : 1994 3J o/ Values in micrometres apply prior to surface treatment. 2 holes 0 D5 (optional) Continuous surface 20“ 1 oo m G D - C N Y- TCH m- Y 1 F o- t fi f Break sharp edges 0,l to 0,4 Details of form not stated are left
20、 to the manufacturers discretion. Figure 1 CEN PREN*3LL2 94 3404587 0062202 T7 Page 6 prEN 31 12 : 1994 Table 1 (concluded) 1) In accordance with IS0 5855-2 2) D, max. shall be less than J. 3) Increments : 2forLI100 4 for L 100 4) If greater lengths are required, they shall be chosen using the above
21、 increments. The length code corresponds to the length L, completed by one or two zeros to the left, where necessary, to obtain a 3 digit code. 5) Approximate values (kgll O00 pieces), calculated on the basis of 7,85 kg/dm3, given for information purposes only. They apply to bolts without holes. 6)
22、Value for head and first L 71 Increase for each additional 2 mm of L. CEN PREN*3LL2 74 3404589 0062203 723 Number of this standard Page 7 prEN 31 12 : 1994 Hole code (see table 2) 4 Designation EXAMPLE : Holes with Code H NOTE : If necessary, the code 19005 shall be placed between the description bl
23、ock and the identity block. - 030 and040 N 050 to 120 6 140 to 200 A 5 Marking See table 3 and figure 1. Table 3 I EN 2424 Stvle I Diameter code I 6 Technical specification IS0 7689, with the following modifications : 6.1 Approval of manufacturers EN 2000 6.2 Other modified requirements - Inspection for discontinuities shall be carried out during the microstructure inspection ; - Classification of defects : replace AQL 0,065% by 1 %. 6.3 Requirements deleted - Qualification of bolts - Tensile strength - Double shear strength - Tension fatigue strength
