1、 AECMA PREN*3bZb 96 3032333 0030757 48T AECMA STANDARD NORME AECMA AECMA NORM prEN 3626 Edition P 2 February 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 10 - Fax. (32) 2 775 81 11 ICs : 49.040.20 Supersedes issue P
2、1 March 1991 Descriptors : ENGLISH VERSION Aerospace series Nuts, hexagon, self-locking in steel, cadmium plated, Mos2 lubricated Classification : 1 100 MPa (at ambient temperature) I235 OC Srie arospatiale crous hexagonaux, freinage interne, en acier, cadmis, lubrifis Mos2 Classification : 1 100 MP
3、a ( temprature ambiante / 235 OC Luft- und Raumfahrt Sechskantmuttern, selbstsichernd, aus Stahl, verkadmet, MoSz-geschmiert Klasse : 1 100 MPa (bei Raumtemperatur) I235 OC This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace
4、Industries). 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 countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to
5、 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 formal agreement of the Official Services of the Member countries it will be submitted as a draft Eur
6、opean Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by E.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX I Comments should be sent within six months after the date of publication to I Edition
7、approved for publication 1996-02-29 AECMA Gulledelle 94 B-1200 BRUXELLES C3 Chairman Mr Arena I I 0 aecma 19% AECMA PREN*3b2b 76 LO12311 OOL0758 3Lb Page 3 prEN 3626 : 1996 1 Scope This standard specifies characteristics of self-locking hexagonal nuts, with flange, in steel, cadmium plated, Mos2 lub
8、ricated. Classification : 1 100 MPa 1) / 235 OC 2). 2 Normative references IS0 5855-2 Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts IS0 5858 Aerospace - Self-locking nuts with maximum operating temperature less than or equal to 425 OC - Procurement specification IS0 7995 Aero
9、space - Nuts, hexagonal, self-locking, with MJ threads, coated or uncoated, classification : 1 100 MPa / 235 OC, 1 100 MPa / 315 OC or 1 100 MPa / 425 OC - Dimensions IS0 8788 Aerospace - Fasteners - Tolerances of form and position for nuts EN 2000 Aerospace series - Quality assurance - EN aerospace
10、 products - Approval of the quality system of manufacturers EN 2133 Aerospace series - Cadmium plating of steels, with maximum specified tensile strength equal to or less than 1 450 MPa, copper, copper alloys and nickel alloys 3) EN 2424 Aerospace series - Marking of aerospace products EN 2491 Aeros
11、pace series - Molybdenum disulphide dry lubricants - Coating methods 3) EN 3042 Aerospace series - Quality assurance - EN aerospace products - Qualification procedure TR 3791 Aerospace series - Materials for all metal self-locking nuts and thin wall insert of temperature classes I425 OC 4) 1) Corres
12、ponds 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 withstand, without permanent alteration to its original characteristics, after
13、 ambient temperature has been restored. The maximum temperature is conditioned by the cadmium plating. 3) Published as AECMA Standard at the date of publication of this standard 4) Published as AECMA Technical Report at the date of publication of this standard Previous page is blank Page 4 prEN 3626
14、 : 1996 3 Required characteristics 3.1 See figure 1 and table 1. Configuration - Dimensions - Masses Dimensions and tolerances are : in conformity with IS0 7995, expressed in millimetres and apply after cadmium plating but before MoS2 lubricating. Details of form not stated are at the manufacturers
15、option. 3.2 IS0 8788 Tolerances of form and position 3.3 Materials TR 3791 3.4 Surface treatments EN 2133, 5 pm min. on threads and all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces, a continuous deposit shall be present. EN 2491, thickness not specified AECMA PREN*
16、3626 96 1012311 0010760 T74 ; - Page 5 prEN 3626 : 1996 Remove sharp edges 0,l to 0,4 x-x 1) These values in micrometres apply before surface threatment. 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 a
17、re permitted in this area. 3) All forms of entry (chamfer or radius) are permissible within these limiting dimensions. Figure 1 Table 1 040 I MJ4x0,7-4H6H 080 I MJ8xl-4H5H 140 I MJ14x1,5-4H5H 2) I IG 10,6 P 12,l I I lors! 10 I 13,2 12 +I 15,5 14 h13 17,91 16 I 1) In accordance with IS0 out-of-round.
18、 5855-2. In the self-lock max. HI min. KIT) min. min. I 4 6,7 0,5 1,5 5 8,3 0,6 2 6,3 I 11,3 I 0,8 I 2,7 I l I. 7,2 12,8 0,9 3,2 + 110,81 18,81 1,4 I 4,5 12,61 21,91 1,7 5 ng zone the tolerances Mass 4) I I 11,l I10,31 6,25 ipply before forming 2) These dimensions apply before forming out-of-round,
19、but finished nuts shall fit a standard socket wrench. 3) Wrench pad engagement 4) Approximate values (kg/l O00 pieces), given for information purposes only AECMA PRENx3b2b 9b m 1012311 O010761 900 m Page 6 prEN 3626 : 1996 4 Designation EXAMPLE : , Number of this standard Diameter code (see table 1) NOTE : If necessary, the 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 : EN 2000 ; - Qualification of products : EN 3042.
