1、(EN PRENx2895 93 3404589 0049435 T4L D Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM C3 Chairman Comments should be sent within six months after the date of publication to prEN 2895 Edition P1 August 1993 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL
2、 Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 UDC : Descriptors : ENGLISH VERSION Aerospace series Nuts, hexagonal, plain, normal height, normal across flats, in corrosion resisting steel, passivated Classification : 900 MPa (at ambient tempe
3、rature) / 425 OC Srie arospatiale Luft- und Raumfahrt surplats normaux, normale Schlsselweite, crous hexagonaux ordinaires, hauteur normale, en acier rsistant la corrosion, passivs Classification : 900 MPa ( temprature ambiante) 1425 OC Sechskantmuttern, normale Hhe, aus korrosionsbestndigem Stahl,
4、passiviert Klasse : 900 MPa (bei Raumtemperatur) I425 OC This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically app
5、roved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification o
6、f the standard. After examination and signature of the AECMA Standard Checking Centre (NPSI and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardiza tionl for formal vote. 1993-08-31 AECMA Techn
7、opolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE M. Arena aecrna 1993 CEN PRENx2895 93 W 3404589 0049436 988 = prEN 2895 Page 3 1 Scope This standard specifies the characteristics of plain, hexagonal nuts, normal height, normal across flats, in corrosion resisting st
8、eel, passivated. Classification : 900 MPa 1) / 425 OC 2) Nuts provided with holes are intended to be used with lockwire in conformity with IS0 245. 2 Normative references IS0 245 IS0 5855-2 IS0 8279 IS0 8788 IS0 9139 EN 2000 EN 2424 EN 2516 EN 3814 EN 3815 TR 3823 Aircraft - Lockwire Aerospace - MJ
9、threads - Part 2 : Limit dimensions for bolts and nuts Aerospace - Plain hexagon nuts with strength classification 1 100 MPa and maximum operating temperature 235 OC Aerospace - Fasteners - Tolerances of form and position for nuts Aerospace - Nuts, plain and slotted - Procurement specification 3) Ae
10、rospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers Aerospace series - Identification marking of standard fasteners 4) Aerospace series - Passivation of corrosion resistant steels and decontamination of nickel based alloys 3) Aerospace series
11、- Corrosion resisting steel FE-PA15, bars for forged fasteners D I 50 mm, softened plus cold drawn plus ground 3) Aerospace series - Corrosion resisting steel FE-PA15, bars for machined fasteners D I50 mm, softened plus straightened plus ground 3) Aerospace series - Materials for plain and slotted h
12、exagonal nuts 5) 3 Required Characteristics 3.1 See figure I and table 1. Dimensions and tolerances are : in conformity with IS0 8279, expressed in millimetres and apply after surface treatment. Form and position tolerances shall be in conformity with IS0 8788. Configuration - Dimensions - Masses 3.
13、2 Materials EN 381 4, EN 381 5 or TR 3823 3.3 Surface treatment EN 251 6, process class appropriate to the material 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class.
14、2) Maximum temperature that the nut is able to withstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment. 3) In preparation at the date of publication of this standard 4) Publi
15、shed as AECMA Standard at the date of publication of this standard 5) Published as AECMA Technical Report at the date of publication of this standard Previous page is blank CEN PREN*2895 93 3404589 00494l17 814 prEN 2895 Page 4 v VI ” Remove sharp edges 0,l to 0,4 I x-x 2 holes optional OU I I 1) Th
16、ese values in micrometres apply prior to surface treatment. The values do not apply to threads the surface texture of which will be as achieved by usual manufacturing methods. 2) All forms of entry (chamfer or radius) permissible within these limiting dimensions 3) Form of contour within limiting di
17、mensions is at manufacturers option. Diameter M may be tangential to, but shall not intrude on the flats. 4) Applicable to both faces 5) From either face Figure 1 1) 2) 3) For information In accordance with IS0 5855-2 The values apply to nuts wihout lockwire hole. CEN PRENa2895 93 340Li589 0049438 7
18、50 = Lockwire holes No hole prEN 2895 Page 5 H - (hyphen) 4 Designation EXAMPLE : 020 to 040 050 to 070 Description block Identity block G N Hole code (see table 2) Diameter code (see table 1) I 080 to 160 180 to 240 NOTE : If necessary, the code 19005 shall be placed between the description block and the identity block. C A Table 2 5 Marking See table 3 and figure 1. Code I Option Table 3 I I EN 2424 Style Diameter code I 6 Technical specification IS0 9139 except for approval of manufacturers : see EN 2000.
