ASD-STAN PREN 3768-1993 Aerospace Series Nuts Anchor Self-Locking One Lug Fixed Reduced Series With Counterbore in Heat Resisting Steel MoS2 Lubricated Classification 1 100 MPa (a.pdf

1、CEN PREN*3768 93 m 3YOY589 OOLi4686 507 m Edition approved for publication 1993-04-26 AECMA STANDARD NORME AECMA AECMA NORM C3 Chairman Mr. ARENA Comments should be sent within six months after the date of publication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux C

2、edex - FRANCE prEN 3768 Edition P 1 April 1993 EDIT PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL 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, anchor, self-loc

3、king, one lug, fixed, reduced series, with counterbore, in heat resisting steel, Mos2 lubricated Classification : 1 100 MPa (at ambient temperature) / 315 OC Srie arospatiale LufG und Raumfahrt crous river, freinage interne, fixes, simple patte, srie rduite, en acier rsistant chaud, lubrifis Mos2 (

4、temprature ambiante) / 31 5 OC Annietrnuttem, selbstsichernd, einseitiger verkrzter Flansch, avec charnbrage, mit zylindrischer Aussenkung, aus hochwarmfestem Stahl, MoS2-geschmiert (bei Raurntemperatur) / 31 5 OC Classification : 1 100 MPa Klasse : 1 100 MPa This “Aerospace Series“ Prestandard has

5、been drawn up under the responsibility of AECMA IAssociation 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 following comment by the Member countri

6、es. 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 Standard Checking Centre (NPS) and f

7、ormal 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. CEN PRENw3768 93 3404589 0044b87 443 prEN 3768 Page 3 1 Scope This standard specifies the characteristics of one lug, re

8、duced series, counterbored fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in heat resisting steel, MOS, lubricated. Classification : 1 100 MPa / 315 OC 2 Normative references IS0 3191 IS0 5855-2 IS0 5858 IS0 8788 EN 2000 EN 2398 EN 2399 EN 2424 EN

9、2491 EN 3042 EN 3638 EN 3639 TR 3791 Aerospace - Self-locking, fixed, single-lug anchor nuts, reduced series, with counterbore, strength classification 1 1 O0 MPa and maximum operating temperature 235 OC Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts Aerospace - Self-locking n

10、uts 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 of the quality system of manufacturers Heat resisting steel FE-PA92

11、-HT - R, 2 900 MPa - Bars for machined bolts - D I 25 mm - Aerospace series 3, Heat resisting steel FE-PA92-HT - R, 2 900 MPa - Bars for forged bolts - D I 25 mm - Aerospace series 3, Aerospace series - Identification marking of standard fasteners 3, Aerospace series - Molybdenum disulphide dry lubr

12、icants - Coating methods 4, Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Heat resisting steel FE-PA92HT - Solution treated - Sheet and strip - a I 3 mm 4) Aerospace series - Heat resisting steel FE-PA92HT cold worked and softened - Bars an

13、d wires for continuous cold forging or extrusion of fasteners - 3 mm I D I 30 mm - R, 2 900 MPa 4, Aerospace series - Materials for all metal self-locking nuts and thin wall inserts of temperature classes I425 OC 5, 1) Corresponds to strength class of the associated bolt, the 100 per cent load of wh

14、ich 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 conditionned

15、by the surface treatment. 3) Published as AECMA Standard at the date of publication of this standard 41 In preparation 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 PRENJ37b 93 m 3404589 OOV46

16、88 38T m prEN 3768 Page 4 3 Required characteristics 3.1 See figure 1 and table 1. Dimensions and tolerances are : in conformity with IS0 3191, expressed in millimetres and apply before MOS, lubrication. Form and position tolerances shall be in conformity with IS0 8788. Configuration - Dimensions -

17、Masses 3.2 Materials EN 2398, EN 2399, EN 3638, EN 3639 or TR 3791 3.3 Surface treatment EN 2491, thickness not specified CEN PREN*3?68 93 = 3404589 O044689 226 Diameter Thread 1 E F G H J2) K L M N3) R S code + 0,2 min. min. max. max. max. max. max. O 040 MJ40,7-4H6H 6 4,4 2,2 6,2 8 18,2 5,8 1,1 2,

18、5 050 MJ50,8-4H6H 7 5,5 5,5 2,4 7,3 9 19,7 6,9 2,5 060 MJ6xl-4H5H 8 6,5 2,7 8,7 10 21,7 8,l 1,4 3 Remove sharp edges 0,l to 0,4 Mass kg/l O00 pieces approx. 12 1,6 2,4 Y-Y y“ 1) In accordance with IS0 5855-2. In the self-locking zone, the tolerances apply before forming out-of-round. 2) Is to sharp

19、corners (chamfered) or point of tangency (radiused). 3) Is applicable at the rivet hole location. P prEN 3768 Page 5 - Form out-of-round in this area to achieve the self-locking torque requirement 2) Radius orJ chamfer 1) These values in micrometres apply prior to surface treatment. The values do no

20、t apply to threads, punched holes or sheared edges, the surface texture of which will be as achieved by usual manufacturing methods. 2) Tooling marks are permitted in this area. 3) Details of form not stated are at the manufacturers option. Figure 1 3, CEN PREN*3?b8 93 3404589 0044bO T38 D prEN 3768

21、 Page 6 4 Designation EXAMPLE : Description block NUT identity block EN3768-060 Diameter code (see table 1) I NOTE : If necessary, the originator code 19005 shall be placed between the description block and the identity block. 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.