1、CEN PRENlw4084 93 = 3404589 004720b 392 9 AECMA STANDARD NORME AECMA AECMA NORM prEN 4084 Edition P 1 June 1993 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 UDC : Descri
2、ptors : ENGLISH VERSION Aerospace series Nuts, anchor, self-locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, Mos2 lubricated Classification : 1 100 MPa (at ambient temperature) I 235 OC Srie arospatiale Luft- und Raumfahrt fixes, double patte, beiderseitiger Flansch, crous
3、river, freinage interne, Annietmuttern, selbstsichernd, avec chambrage, mit zylindrischer Aussenkung, en acier alli, cadmis, lubrifis Mos2 Classification : 1 100 MPa ( temprature ambiante) I235 OC aus legiertem Stahl, verkadmet, MoS2-geschrniert Klasse : 1 100 MPa (bei Raumtemperatur) I235 OC This “
4、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 approved by the experts of the concerned Technical Committee follo
5、wing 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 of the standard. After examination and signature of the AECMA St
6、andard Checking Centre (NPS) 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 Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - TechnoDolis 54 - 199, rue Jean-Jacqu
7、es Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX I Comments should be sent within six months after the date of publication to I Edition approved for publication AECMA I Technooolk - 175. rue Jean-Jacaues Rousseau 1993-06-30 I 921 38 Issy-les-Moulineaux Cedex - FRANCE I C3 Chairman Mr. Arena (EJ aecma
8、199: CEN PREN*4084 93 m 3404589 0047207 229 m prEN 4084 Page 3 1 Scope This standard specifies the characteristics of two lug fixed anchor nuts, with counterbore and a self-locking feature achieved by forming the upper portion out-of-round, in alloy steel, cadmium plated, Mos2 lubricated. Classifica
9、tion : 1 100 MPa ) I235 OC *I 2 Normative references IS0 3223 IS0 5855-2 IS0 5858 IS0 8788 EN 2000 EN 2133 EN 2424 EN 2491 EN 2542 EN 2543 EN 3042 TR 3791 Aerospace - Nuts, anchor, self-locking, fixed, two lug, with counterbore, with MJ threads, coated or uncoated, classification 1 100 MPa I 235 OC,
10、 1 100 MPa I 315 OC or 1 100 MPa I 425 OC - Dimensions Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts Aerospace - Self-locking nuts with maximum operating temperature less than or equal to 425 OC - Procurement specification Aerospace - Fasteners - Tolerances of form and positi
11、on for nuts Aerospace series - Quality assurance - EN aerospace products - Approval of the quality systems of manufacturers Cadmium plating of steels with maximum specified tensile strength equal to or less than 1 450 MPa and copper and copper alloys - Aerospace series Aerospace series - Identificat
12、ion marking of standard fasteners 31 Aerospace series - Molybdenum disulphide dry lubricants - Coating methods 41 Aerospace series - Steel FE-PL43S - Annealed - Bar and wire De S 40 mm for prevailing torque nuts 51 Aerospace series - Steel FE-PL43S - Annealed - Sheet and strip 0,3 I a I 2 mm for pre
13、vailing torque nuts 5, Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Materials for all metal self-locking nuts and thin wall inserts of temperature classes I425 OC 1) Corresponds to strength class of the associated bolt, the 100 per cent lo
14、ad of which it is able to withstand, when tested at ambient temperature, without breaking or cracking. 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 condi
15、tioned by the surface treatment. 3) Published as AECMA Standard at the date of publication of this standard 4) In preparation at the date of publication of this standard 5) Published as AECMA Prestandard at the date of publication of this standard 6) Published as AECMA Technical Report at the date o
16、f publication of this standard Previous page is blank CEN PRENm4084 93 3404589 0047208 Lb5 prEN 4084 Page 4 3 Required characteristics 3.1 See figure 1 and table 1. Configuration - Dimensions - Masses Dimensions and tolerances are : in conformity with IS0 3223, expressed in millimetres and apply aft
17、er cadmium plating but before MOS, lubrication. Form and position tolerances shall be in conformity with IS0 8788 and those specified in table I. 3.2 Materials EN 2542, EN 2543 or TR 3791 3.3 Surface treatment EN 2133, 5 pm minimum on threads and all surfaces which can be contacted by a 20 mm diamet
18、er ball. On all other surfaces a continuous deposit shall be present, plus EN 2491, thickness not specified. O CEN PREN*4084 93 = 3404589 0047209 OTL 1) In accordance with IS0 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. 2) Is to sharp corners (chamfered) or po
19、int of tangency (radiused). 3) Is applicable at the rivet hole location. , 4) Diameter code 030 does not have a counterbore. Remove sharp edges 0,l to 0,4 Marking prEN 4084 Page 5 Alternatives :countersunk rivet holes (when specified by purchaser) may be dimpled or cut countersunk (at manufacturers
20、opt ion). Y-Y Form out-of-round in this area to achieve the self-locking 1) These values in micrometres apply before surface treatment. The values do not apply to threads and sheared edges the surface texture of which will be achieved by usual manufacturing methods. 2) Tooling marks are permitted in
21、 this area. 3) Details of form not stated are at the manufacturers option. O I Diameter I Thread 1) IEIFIG code min. I 030 I MJ3x0.5-4H6H I 6 I 12 1-4) Figure 1 3, Table 1 3 - J 21 max. 4,6 - 6,2 7.3 8,7 10,9 12,9 - T max. I max. - M max. - kgll O00 pieces f0,25 a rox. 2,lO 4,40 6,6 CEN PRENr4084 93
22、 3404589 O047210 813 Description block prEN 4084 Page 6 Identity block EN4084-060 4 Designation EXAMPLE : Plain rivet holes Dimpled or countersunk rivet holes - (hyphen) K NOTE : If necessary, the code 19005 shall be placed between the description block and the identity block. O Table 2 5 Marking EN 2424, style N. See figure 1, 6 Technical specification IS0 5858 except for : - Approval of manufacturers : see EN 2000 ; - Qualification of products : see EN 3042.
