ASD-STAN PREN 3752-1994 Aerospace Series Nuts Self-Locking MJ Threads in Heat Resisting Steel FE-PA92HT (A286) MoS2 Coated Classification 1 100 MPa (at Ambient Temperature) 425 Deg.pdf
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1、CEN PRENu3752 94 3404589 0080987 L2T H Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months C8 Chairman after the date of publication to prEN 3752 Edition P 1 December 1994 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPAT
2、IAL 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,self -locking, M J threads, in heat resisting steel FE-PA92HT (A286), Mos2 coated Classification : i 100 MPa (at ambient temperature) /
3、 425 OC Technical specification Srie arospatiale Luft- und Raumfahrt crous, freinage interne, filetage MJ, en acier rsistant chaud FE-PA92HT (A2861, Muttern, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl FE-PA92HT (A2861, revtus Mos2 Mos2 beschichtet Classification : 1 100 MPa Klasse : 1 100
4、MPa ( temperature ambiante) / 425 OC (bei Raumtemperatur) I425 OC Spcification technique Technische Lieferbedingungen 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 pape
5、r for the 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 affe
6、cted, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard 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 f
7、or Standardization) for formal vote. 1994-1 2-1 6 AECMA Technopolis - 175, rue Jean-Jacques Rousseau 92 138 Issy-les-Moulineaux Cedex - FRANCE Mr Williams 0 aecma 1994 CEN PRENt3752 94 3404589 0080988 066 Page 2 prEN 3752 : 1994 Contents list 1 Scope 2 Normative references 3 Definitions 4 Quality as
8、surance 5 Requirements CEN PREN*3752 94 3404589 0080787 TT2 Page 3 prEN 3752 : 1994 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for self-locking nuts with MJ threads in FE-PA92HT, Mos2 coated. Classification 1 100 MPa I425 OC 2). It is applicable wh
9、enever referenced. 2 Normative references IS0 2859-1 IS0 3452 IS0 3534-1 977 IS0 4288 IS0 5855-2 IS0 7481 EN 2491 EN 3042 ASTM EI 12-88 Sampling procedures for inspection by attributes - Part 1 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection Non destructive testi
10、ng - Penetrant inspection - General principles Statistics - Vocabulary and symbols Rules and procedures for the measurement of surface roughness using stylus instruments Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts Aerospace - Fasteners - Self-locking nuts with maximum opera
11、ting temperature less than or equal to 425 OC - Test methods Aerospace series - Molybdenum disulphide dry lubricants - Coating methods 3, Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Standard Test Methods for Determining Average Grain size 4, 1) Corresponds
12、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 test temperature of the parts 3) In preparation at the date of publication of this standard 4) Published by : American S
13、ociety for Testing and Materials (ASTM), 1916 Race street, Philadephia, PA 19103, USA CEM PREN*3752 94 3404589 0080970 714 Page 4 prEN 3752 : 1994 3 Definitions For the purposes of this standard, the following definitions apply : 3.1 Production batch Quantity of finished nuts manufactured, using the
14、 same process, from a single material cast (single heat of alloy), having the same number (of product standard or definition document), thread code and diameter, heat treated together to the same specified condition and produced as one continuous run. 3.2 Inspection lot Quantity of nuts from a singl
15、e production batch with the same number (of product standard or definition document) which completely defines the nut. 3.3 Discontinuities 3.3.1 Crack : Rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character. 3.3.2 Seam : Open sur
16、face defect 3.3.3 forging them into the surface. Lap : Surface defect caused by folding over metal fins or sharp corners and then rolling or 3.3.4 particles may be isolated or arranged in strings. Inclusions : Non-metallic particles originating from the material manufacturing process. These 3.4 Test
17、 temperature Ambient temperature, unless otherwise specified 3.5 Simple random sampling The taking of n items from a population of N items in such a way that ali possible combinations of n items have the same probability of being chosen 5). 3.6 Critical defect A defect that, according to judgement a
18、nd experience, is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product, or that is likely to prevent performance of the function of a major end item l. 3.7 Major defect A defect other than critical, that is likely to result i
19、n a failure or to reduce materially the usability of the considered product for its intended purpose ). 3.8 Minor defect A defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having lit
20、tle bearing on the effective use or operation of this product 5). CEN PRENx3752 94 3404589 0080993 b50 E Page 5 prEN 3752 : 1994 3.9 Sampling plan A plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision 5). 3.10 Limiting quality In a sa
21、mpling plan, the quality level which corresponds to the specified 10 % probability of acceptance. 3.1 1 Acceptable quality level (AQL) A quality level which in a sampling plan corresponds to a specified but relatively high probability of acceptance. It is the maximum per cent defective (or the maxim
22、um number of defects per hundred units) that, for purposes of sampling inspection can be considered satisfactory as a process average 3.12 Finished nut A nut ready for use , inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document. 3.1
23、3 Definition document Document specifying all the requirements for finished nuts 3.14 Self-locking torque The torque to be applied to the nut or bolt to maintain its movement of rotation in relation to the associated part, the assembly being under no axial load and the nut locking system being compl
24、etely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer). 3.15 Seating torque The tightening torque to be applied to the nut or bolt to introduce or to increase the axial load in the assembly. 3.16 Unseating torque The untightening torque to be applied to the nut or
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