1、CEN PREN*3723 93 W 3404589 0033629 7 = i - Edition approved for publication 1991 -05-31 W A.E.C. M.A. STANDARD NORM E 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, Bd. Malesherbes 75008 PARIS - FRANCE prEN 3723 Issue P 1
2、 May 1991 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : Key words : ENGLISH VERSION Aerospace series Nuts, hexagonal, self-locking, in heat resisting steel Mos2 coated Classification : I100 MPa (at ambient tempera
3、ture) / 425 OC FE-PA92HT (A286), Srie arospatiale Ecrous hexagonaux, freinage interne, en acier rsistant chaud revtus MOS, Classification : 1 1 O0 MPa ( temprature ambiante) / 425 OC FE-PA92HT (A286), Luft- und Raumfahrt Sechskantmuttern, selbstsichernd, aus hochwarmfestem Stahl MOS, beschichtet Kla
4、sse : 1 1 O0 M Pa (bei Raumtemperatur) / 425 OC FE-PASPHT (A286). 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 technic
5、ally approvedby the experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of
6、 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 can b
7、e supplied by B.N.A.E. - Technopolis 54- 199, rue Jean-Jacques Rousseau - 92138 ISSY LES MOULINEAUX CEOEX C8 Chairman Mr. WILLIAMS r I - -. aecma 1991 I CEN PREN*3723 73 3404587 O033630 3 _ prEN 3723 Page 3 1 Scope and field of application This standard specifies the characteristics of hexagonal nut
8、s, self-locking, in FE-PA92HT, MOS, coated for aerospace applications. Classification : 1 1 O0 MPa1)/425 OC2) 2 References IS0 5855-2, Aerospace - MJ threads - part 2 : Limit dimensions for bolts and nuts IS0 7995, Aerospace - Nuts, hexagonal, self-locking, with MJ threads, coated or uncoated, class
9、ification 1 1 O0 MPa/235 OC, 1 1 O0 MPa/315 -OC or 1100 MPa/425 OC - Dimensions Heat resisting steel FE-PA92HT - Rm 2900 MPa - Bars for forged bolts D S 25 mm - Aerospace series 3) EN 2399, EN 2424, Aerospace series - Identification marking of standard fasteners 3) EN 3752, Aerospace series - Nuts s
10、eif-locking in heat resisting steel FE-PA92HT (A2861, MOS, coated - Classification : 1 1 O0 MPa/425 OC - Technical specification 4) Aerospace series - Molybdenum disulphide dry film lubricants, applied to fasteners 4) EN 2491, EN 3638, Aerospace series - Heat resisting alloy FE-PA92HT - Solution tre
11、ated - Sheet and strip - a S 3 mm 4) EN 3639, Aerospace series - Heat resisting alloy FE-PA92HT - Rm 2 900 MPa - Cold worked and softened - Bar and wire for continuous cold forging or extrusion of fasteners - 3 S D I; 30 mm 4) 3 Required characteristics 3.1 Configuration - Dimensions - Tolerances -
12、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, EN 3638 or EN 3639 3.3 Surface coating EN 2491 1 I The strength class of the bolt concerned which can withstand the load at ambient temperature when
13、 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 the date of publication of the present standard - I. -. - _2_7 Previous page -.- is blank i ;
14、CEN PRENS3723 9% W 3404589 00L3b3L 5 W prEN 3723 page 4 I These values are lo be applied before lubrifgation Threads surface will be as achieved by normal methods of manufacture Form out-of-round in this areato achieve the self-locking requirement (tooling marks permissible) Chamfer, radius or broke
15、n edge Marking in these 1 areas permissible Remove sharp edges 0,1 to 0,4mm Details of form no1 stated are left to lhe manufacturers discretion. within these limiting dimensions. 1) All forms of entry (radius or chamfer) are permissible Figure Table Mass Code parts Thread 1) E2) F2) G H K M N3 Q W y
16、 24) kg/iOOO slgnafion nin. mu. mu. min. nin. min. mu. nin. 030 MJ3X0,5 -4H6H 4,2 4 6 3 5.3 0,4 3,8 32 0,2 0,1 02 0,28 1,2 6,7 0,5 4,8 4,2 0,2 0,1 02 03 7,4 1,5 O40 K14X0,7-4H6H 5,3 5 4 O50 MJ5x0,8 4H6H 6,5 6 hl2 9,l 5 8,3 0,6 2 5,8 5,2 0,2 0,1 02 088 O60 MJGXl,O -4H5H 7,6 7 108 5,4 9,8 0,7 2,3 7,1
17、6,3 0,2 0,1 0,4 1,15 070 MJ7Xl,O-4H5H 8,7 8 12,1 6,3 11,3 0,8 2,7 8,1 7,3 0,2 0,1 0,4 1,7 O80 hlJ8xi,O -4H5H 10,9 10 13,6 7,2 12,8 0,9 3,2 ,I 8,3 0,2 0,i 0,4 3,15 100 MJ10xi,25-4H5H 13,2 12 hi3 16,8 9 15,8 1,l 3,8 11,l 10,3 0,3 0,13 0,4 4,75 120 MJ12X1,25-4H5H 15,5 14 19,9 10,8 18,8 1,4 4,5 13,1 12,
18、3 0,3 0,13 0,4 10 i) In accordance with IS0 5855 part 2. IN the self-locking zone lhe tolerances apply before forming out-of-round. 2) These dimensions apply before forming out-of-round, but finished nuts shall fit a standard socket wrench. 3) Wrench pad engagement. 4) These values apply before forming oulsf-round. *)These dimensions are in accordance with IS0 7995. /CEN PREN*3723 91 3404589 O033632 7 1 _ prEN 3723 Page 5 Thread Code 030 and 040 050 to 120 4 Designation Example: Style N C Description block NUT Identity block EN3723-050 Number of this standard :T Thread code (see table) I
