1、A. E.C. M .A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 3012 Issue P 1 January 1988 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, self-locking, bihexagonal
2、in heat resisting nickel base alloy NI-PI O1 HT (Waspaloy) unplateci Classification : 121 O MPa/730 OC Srie arospatiale Luft- und Raumfahrt Ecrou bihexagonal, auto-freinant, Zwlfkantmuttern, selbstsichernd en acier rsistant chaud base de nickel NI-PI O1 HT (Waspaloy) non revtu Classification : 121 O
3、 MPa/730 OC aus hochwarmfester Nickelbasiclegierung NI-Pl 01 HT (Waspaloy) blank Klasse : 121 O MPa/730 OC This .Aerospace Series pre-standard has been drawn up under the respopJcibi/ity of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). Et Is pub/ished OB, gveen paper for the
4、 needs ofAECMA-Members. It has been technically approveby the experts of the concerned AECMA 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, physical
5、ly 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 for Standardiz
6、ation) for final vote. Nota - Extra copies can be supplied by B.N.A.E. - 8, rue Moreau-Vauthier - 92100 BOULOGNE-BILiAiUCBURT after the date of publication decision CE Chairman h4P. WICCBAzc4S I A.C.I“.A. I 88, Bd. Malesherbes 18 January 1988 75008 PARIS - FRANCE . aecrna 1988 Issue P 1 prEN3012 Pag
7、e 3 1 Scope and field of application This standard specifies the properties of bihexagonal, internally self-locking nuts, produced by deformation of one end of the nut. These nuts are intended for use in aeronautical assembliess which are stressed mainly in tension. The material limits their use to
8、a tensile strength level of 1210 MPa and a temperature of 730 OC. 2 References IS0 4095, IS0 5855/1, IS0 5855/2, EN 2959, EN 3220, EN 2424, EN 3005, Fasteners for aerospace construction - Bi-hexagonal wrenching configuration Aerospace construction - MJ threads - Part 1 : Basic profile Aerospace cons
9、truction - MJ threads - Part 2 : Dimensions for bolts and nuts Aerospace series - Heat resisting nickel base alloy (NI-PlOlHT) - Solution treated and cold worked - Bar for hot upset forging for fasterners 3 5 D 5 30 mm 1) Aerospace series - Heat resisting nickel base alloy (NI-PlOlHT) - Cold worked
10、and softened - Bar and wire for continuous cold forging or extrusion for fasterners 3 - D 5 30 mm Identification marking of standard fasteners - Aerospace series 1) Aerospace series - Nuts, self-locking, in heat resisting nickel base alloy NI-PlOlHT (Waspaloy) - Classification 1210 MPa/730 OC - Tech
11、nical specification 1) 3 Required characteristics 3.1 Configuration - Dimensions - Tolerances The configuration must be in accordance with the figure ; dimensions and tolerances shall conform with the figure and the table, Details of form, not stated are at the manufacturers option. 3.2 Material Hea
12、t resisting nickel base alloy NI-PlOlHT to EN 2959 or EN 3220. 3.3 Surface treatment None. Previous page is blank 1) In preparation. 0262MR1 O8 7 T4 I AECNA PREN3012 B 101231l 0004b72 3 : Issue P 1 prEN3012 Page 4 MARKING AREA r- r dl 1 YIA I , , -7 BEARING SURFACE MAY BE FIAT I OR CiKiV; BUT CHU iO
13、l BE FORM OUT OF ROUN IN MIS AREA TO ACHIEVE THE SELF LOCKING TORQUE REQUIREMENT (TOOL MARKS ACCEPTABLE) REMOVE SHARP EDGES 0.1 TO 0.4 Figure - Configuration Table - Dimensions and masses Dimensions in millimetres (2) Bihexagonal wrenching configuration IS0 4095 on length N. (3) All. forms of entry
14、(radius or chamfer) optional within this limiting dimensions. (4) Wrench pad engagement. (5) Thread according to IS0 5855. In self-locking zone the tolerances apply before forming out of round, 026 2M108 7T4 AECMA PREN3012 - 88 101231L 0004673 5 - W Issue P 1 prEN3012 Page 5 4 Designation Each bihex
15、agonal nut shall only be designated as in the following example : Description block Identity block 050 = Diameter (see table) I Note : If necessary, the design code S9005 may be introduced between the description block and identity block. 5 Marking Each bihexagonal nut will be marked in accordance with EN 2424 class A. 6 Technicax specification The bihexagonal nuts shall conform with the requirements of EN 3005.
