1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 4121 Edition P 2 March 2013 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Supersedes edition P 1 of Februa
2、ry 1994 and will supersede EN 4121:2004 Descriptors: ENGLISH VERSION Aerospace series Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread Classification: 1 100 MPa (at ambient temperature) / 650 C Srie arospatiale crous dentels sertir, freinage inter
3、ne, en acier rsistant chaud FE-PA2601 (A286), argents sur filetage Classification : 1 100 MPa ( temprature ambiante) / 650 C Luft- und Raumfahrt Einnietmuttern, verzahnt, selbstsichernd, aus hochwarmfestem Stahl FE-PA2601 (A286), Gewinde versilbert Klasse: 1 100 MPa (bei Raumtemperatur) / 650 C This
4、 “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Do
5、main following member comments. 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 review by users and formal agre
6、ement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a nat
7、ional standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 31 March 2012 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2013 by ASD-STAN prEN 4121:2013 (E) 2 Contents Page Forewor
8、d . 2 1 Scope . 3 2 Normative references . 3 3 Requirements characteristics . 3 4 Designation . 5 5 Marking 5 6 Technical specification 6 7 Installation . 6 Annex A (informative) Standard evolution form . 7 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanic
9、al Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 4121:2013 (E) 3 1 Scope This standard specifies the characteristics of self-locking serrated shank nuts in
10、FE-PA2601, silver plated on thread, for aerospace applications. Classification: 1 100 MPa 1)/ 650 C 2). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the
11、latest edition of the referenced document (including any amendments) applies. EN 2399, Aerospace series Heat resisting steel FE-PA2601 (X4NiCrTiMoV26-15) Rm 900 MPa Bars for forged bolts D 25 mm EN 2424, Aerospace series Marking of aerospace products EN 2786, Aerospace series Electrolytic silver pla
12、ting of fasteners EN 3004, Aerospace series Nuts, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286) Classification: 1 100 MPa (at ambient temperature) / 650 C Technical specification EN 3064, Aerospace series Shank nuts, self-locking, serrated Installation procedure EN 3065, Aerospa
13、ce series Installation holes for self-locking, serrated shank nuts Design standard EN 3639, Aerospace series Heat resisting alloy FE-PA2601 Softened and cold worked Wire for forged fasteners D 15 mm 900 MPa Rm 1 100 MPa 3)ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts 3
14、 Requirements characteristics 3.1 Configuration Dimensions Tolerances Masses See Figure 1 and Table 1. Dimensions and tolerances are in millimetres. They apply after silver plating for thread surface. 3.2 Materials EN 2399 or EN 3639. 1) Correspond to the minimum tensile stress which the nut is able
15、 to withstand at ambient temperature without breaking or cracking when tested with a bolt of a higher strength class. 2) Maximum test temperature of the parts. 3) Published as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). prEN 4121:2013 (E) 4 3.3 Surface treatm
16、ent EN 2786 on thread only Thickness: thread MJ6: 5 m min. on thread flanks; thread MJ5: shall show complete coverage, without thickness requirement. Coating may extend to counterbore and chamfers at manufacturers option, without thickness requirement. Values applicable before silver plating. Thread
17、 surface will be as achieved by normalmethods of manufacture. Remove sharp edges 0,1 to 0,4. Style 1 Style 2 Z Y Key 1 Thread 2 Pitch diameter 3 Form out-of-round in this area to achieve theself-locking requirement (tooling marks permissible). 4 Marking 5 Diameter P (wire) 6 Number of teeth J NOTE C
18、onfigurations, style 1 or style 2, are permitted. Figure 2 prEN 4121:2013 (E) 5 Table 1 ThreadaB bC D E F G H J Code Designation max. min. max. min. max. min. min. min. max. Numberof teeth 050 MJ50,8-4H6H 6,3 10,1 9,8 6,8 6,1 7,38 7,15 0,9 5,12 3,3 17 060 MJ61-4H5H 7,7 11,5 11,2 8,6 7,9 8,98 8,75 1,
19、4 6,56 3,6 20 070 MJ71-4H5H 8,4 12,7 12,4 9,7 9 10,28 10,05 8,10 5 23 080 MJ81-4H5H 9,5 10 9,3 7 Code K M N Wire S U Mass cmax. min. max. max. No. P max. min. max. min. 1 Style 1 Style 2050 6,62 6,36 7,7 7,7 3 1,0 8,730 8,639 2,4 1,6 8630 1,71 1,97 060 8,17 7,91 9,1 8,7 2 1,2 10,638 10,547 102 2,73
20、3,02 070 9,44 9,18 10,4 9,8 3 1,5 12,536 12,445 2,9 2,1 3,46 3,84 080 10,9 3,58 4,21aIn accordance with ISO 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. bApplicable before forming out-of-round. cMass quoted in kg/1 000 parts. 4 Designation EXAMPLE Description b
21、lock NUT Identity block EN4121-080 Number of this standard Three code (see Table 1) NOTE If necessary, the code I9005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style A, as indicated on Figure 1. prEN 4121:2013 (E) 6 6 Technical specification EN 3004. 7
22、Installation The nuts shall be installed according to the procedure specified in EN 3064 in installation holes to EN 3065. Careful attention shall be paid to notch sensitivity of the materials in which they are to be installed. prEN 4121:2013 (E) 7 Annex A (informative) Standard evolution form MODIF
23、ICATION REASON AND VALIDATION Before: Figure 1 size G external. After: Figure 1 size G internal. Before: Figure 1 teeth width 14,5 min. from external side of skirt to end of teeth. After: Figure 1 teeth width 1,45 min. from beginning of teeth to flange. Before: Figure 1 key notes 1 to 10. After: Figure 1 key notes 1 to 6. Four notes changed to full text. Others become: 1 Thread 2 Pitch diameter 3 Form out-of-round in this area to achieve the self-locking requirement (tooling marks permissible) 4 Marking 5 Diameter P (wire) 6 Number of teeth J
