1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication prEN 3751 Edition P 2 October 1996 Comments should be sent within six months after the date of publication to C3 Chairman PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Te
2、l. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : 49.040.20 Supersedes edition P1 January 1993 Descriptors : ENGLISH VERSION Aerospace series Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore, in heat resisting steel, Mos2 lubricated Classification : 1 100 MPa (at am
3、bient temperature) / 315 OC Srie arospatiale Luft- und Raumfahrt crous river, freinage interne, fixes, dangle, srie rduite, en acier rsistant chaud, lubrifis Mos2 ( temprature ambiante) I315 OC Annietmuttern, selbstsichernd, einseitiger verkrzter Eckflansch, avec chambrage, mit zylindrischer Aussenk
4、ung, aus hochwarmfestem Stahl, Mos,-geschmiert (bei Raumtemperatur) I315 OC Classification : 1 100 MPa Klasse : 1 100 MPa This “Aerospace Series I Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for th
5、e needs of AECMA-Members. It has been technically approved 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, ph
6、ysically 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 European Standard to CEN (European Committee for Stan
7、dardira tion) for formal vote. 1996-10-31 AECMA Gulledelle 94 B-1200 BRUXELLES Mr Arena I I aecma 1991 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
8、Page 3 prEN 3751 : 1996 1 Scope This standard specifies the characteristics of self-locking, fixed, closed corner anchor nuts, reduced series, with counterbore, in heat resisting steel, MOS, lubricated. Classification : 1 100 MPa 1) / 315 OC 2) 2 Normative references IS0 3222 IS0 5855-2 IS0 5858 IS0
9、 8788 EN 2000 EN 2424 EN 2491 EN 3042 TR 3791 Aerospace - Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore, with MJ threads, coated or uncoated, classification 1 100 MPa / 235 OC, 1 1 O0 MPa / 31 5 OC or 1 1 O0 MPa / 425 OC - Dimensions Aerospace - MJ threads - Part
10、 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 position for nuts Aerospace series - Quality assurance - EN aerospace products - Approval
11、of the quality system of manufacturers Aerospace series - Marking of aerospace products Aerospace series - Molybdenum disulphide dry lubricants - Coating methods 3) Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Materials for all metal self-
12、locking nuts and thin wail inserts of temperature classes I425 OC 4) 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. 2) Maximum temperature that the nut is able to
13、withstand, without permanent alteration to its original characteristics, after ambient temperature has been restored. The maximum temperature is conditioned by the surface treatment. 3) Published as AECMA Standard at the date of publication of this standard 4) Published as AECMA Technical Report at
14、the date of publication of this standard Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 4 prEN 3751 : 1996 3 Required characteristics 3.1 See fig
15、ure 1 and table 1. Configuration - Dimensions - Masses Dimensions and tolerances are : in conformity with IS0 3222, expressed in millimetres and apply before MOS, lubrication. Details of form not stated are at the manufacturers option. The cap shall remain joined (type of attachment at the users dis
16、cretion) to the nut at the maximum operating temperature. See test conditions in IS0 5858. 3.2 IS0 8788 Tolerances of form and position 3.3 Materials TR 3791 3.4 Surface treatment EN 2491, thickness not specified Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by I
17、HS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M LOL23LL 0033023 4T2 m Diameter code 040 050 060 Page 5 prEN 3751 : 1996 Thread C D E F G H J2) max. max. min. min. max. M J40,7-4H 6H 6,6 6 4,4 2,2 6,2 MJ50,8-4H6H 0,4 7,9 7 5,5 5,5 2,4 7,
18、3 MJ6xl-4H5H 9,2 8 6,5 2,7 8,7 Remove sharp edges Oll to 0,4. Diameter code 040 060 050 Form out-of-round in this area to achieve the self-locking torque requirement *l. Configuration with cap K L M N3) P4) Q R W Mass 5, max. max. max. max. max. max. N max. 4 12 5t8 , 1 l3 2,5 10,5 I 1 ,o 4,5 13,6 6
19、9 11,4 13,4 113 5 15,7 8,l 1,2 12,7 14,7 3 11,5 1,8 1) These values in micrometres apply before surface treatment. They do not apply to threads and sheared edges the surface texture of which will be as achieved by usual manufacturing methods. 2) Tooling marks are permitted in this area. Figure 1 Ta
20、ble 1 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 6 prEN 3751 : 1996 Cap 4 Designation EXAMPLE : Code Description block Identity block Number
21、of this standard Cap code (see table 2) Diameter code (see table 1) with NOTE : If necessary, the code 19005 shall be placed between the description block and the identity block. B I without I -(hyphen) I 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. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
