1、ICEN PREN*3720 91 = 3404589 OOl13bl14 5 Edition approved for publication 1991 -05-31 -p_7 A. E .C. M .A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM Comments should be sent within six months after the date of publication decision A.E.C.M.A. 88, Ed. Malesherbes 75008 PARIS - FRANCE prEN 3720 Issue P I
2、 May 1991 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATERIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : Key words : ENGLISH VERSION Aerospace series Nuts, bihexagonal, self-locking, in heat resisting steel MOS, coated Classification : i i O0 MPa (at ambient te
3、mperature) / 425 OC FE-PA92HT (A286), Srie arospatiale Luft- und Raumfahrt crous bihexagonaux, freinage interne, en acier rsistant chaud Zwlfkantmuttern, selbstsichernd, aus hochwarmfestem Stahl FE-PA92HT (A286). FE-PA92HT (A286), revtus MOS, MOS, beschichtet Classification : 1100 MPa ( temprature a
4、mbiante) / 425 OC Klasse : 1 1 O0 MPa (bei Raumtemperatur) / 425 OC This .Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been tech
5、nically approved by the experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shallnot be changed to an extent that interchangeability is affected, physically or functionally, without re-identification
6、 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 for Standardization) for final vote. Nota - Extra copies ca
7、n be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY LES MOULINEAUX CEDEX I I C8 Chairman Mr. WILLIAMS 7 - I I aecma 1991 -. _ CEN PRENs3720 91, = 3404589 OOl13hl15 7 W .- _ - prEN 3720 Page 3 1 Scope and field of application This standard specifies the characteri
8、stics of bihexagonal nuts, self locking, in FE-PA92HTI Mosi coated for aerospace applications. Classification :I 1 O0 MPa 1 )/425OC 2) 2 References IS0 4095 IS0 58592 EN 2399 EN 2424 EN 3752 EN 2491 EN 3639 Fasteners for aerospace construction - Bi-hexagonal wrenching configuration Aerospace - MJ th
9、reads - part 2: Limit dimensions for bolts and nuts Heat resisting steel FE-PA92HT - Rm 2 9OOMPa - Bars for forged bolts D s 25mm - Aerospace series 3) Aerospace series - identification marking of standard fasteners 3) Aerospace series - Nuts self-locking in heat resisting steel FE-PA92HT(A28QI Mos2
10、 ;oat& - Classification : 1 I00 MPa/425OC - Technical specification 4) Aerospace series - Molybdenum disulphide dry film lubricants, applied to fasteners 4) Aerospace series - Heat resisting alloy FE-PA92HT - Rm 2 9OOMPa - Cold worked and softened - Bar and wire for continuous cold forging or extrus
11、ion of fasteners - 31Ds30mm4) 3 Required characteristics 3.1 Configuration - Dimensions - Tolerances - Masses See figure and table, dimensions and tolerances are in millimetres. These values are to be applied before surface coating. 3.2 Material EN 2399 or EN 3639 3.3 Surface coating EN 2491 1) The
12、strength class of the bolt concerned which can withstand the load at ambient temperature when tested at 100% load without cracking or breaking of the nut. 2) Maximum test temperature of the parts 3) Published as AECMA standard at the date of publication of the present standard 4) In preparation at t
13、he date of publication of the present standard -_ i r CEN PREN*3720 9% 3404589 0033636 9 I prEN 3720 Page 4 Form ovt.o-round in thic area to achieve lhe self-locking of manufadure . requirement (toding marks permisible) These values are to be applied before lubrification 6,v ( 1,v ) Threads surface
14、will be as achieved by normal methods Bihexagonai wrenching configuration IC0 4095 on length M Remove sharp edges 0,l 10 0,4mm Details of form not stated are leR to lhe manufactureis discretion. 1) All forms o entry (radius or chamfer) are permisible within these iimking dimensions. Figure Table 070
15、 I MJfxl,0-4H5H I 8,l I 7,3 1 9 080 MJXl,0-4H5H 91 8,3 10 1 O0 MJ101,25-4H5H 11,l 10,3 12 120 MJ 121,25*4H5H 13,l 12,3 14 i 40 MJ14Xl,5-4H5H 15,2 14,4 17 H J KL max. max. min. min. 7 9, 8,3 1,2 8,l 10,6 9,8 1,2 9,l 12,l 11,3 1,2 10,4 13,6 12,8 1,2 13 16,8 15,8 1,2 i 5 i9,g i8,a 1,4 17,5 23 21,9 1,7
16、I l 2,6 6,l 0,l 0,2 3,19 /- I- - ) In accordance with IS0 58% part 2. In the self-locking zone lhe tolerances appiy before forming out-01-round. CEN PREN83720 91 M 3404589 0013617 O - prEN 3720 Page 5 4 Designation Example: Description block NUT identity block EN3720-050 Number of this standard Thread code (see table) i Note : if necessary the originator code 19005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style A, as indicated on the figure 6 Technical specification EN 3752 J
