1、A. E .C. M .A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 3637 Issue P 1 August 1990 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, bi-hexagonal
2、 (double reduced), in heat resisting nickel base alloy NI-PI O1 HT (Waspaloy), silver plated Classification : 121 O MPa/730 OC Srie arospatiale Luft- und Raumfahrt crous bihexagonaux, Zwlfkantmuttern, auto-freinants (double rduit), en alliage rsistant chaud base de nickel NI-PI O1 HT (Waspaloy), arg
3、ents Classification : 121 O MPa/730 OC selbstsichernd (Doppel reduziert), aus hochwarmfester Nickelbasislegierung NI-Pi01 HT (Waspaloy), versilbert Klasse : 121 O MPa/730 OC This Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeur
4、s 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 Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be chang
5、ed to an extent that interchangeability is affected, physically or functionaliy, 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 draf
6、t European Standard to CEN (European Committee for Standardization) for final vote. Nota - Extra copies can be supplied by B.N.A.E. - 8, rue Moreau-Vauthier - 92100 BOULOGNE-BILLANCOURT Comments should be sent within six months after the date of publication decision I Edition approved for publicatio
7、n 1990-08-24 A.E.C.M.A. 88, Bd. Malesherbes 75008 PARIS - FRANCE C8 Chairman Mr. WILLIAMS aecma 1990 prEN 3637 Page 3 i Scope and field of application This standard specifies the dimensions of self-locking, silver-coated bihexagonal nuts with MJ-thread in heat resisting nickel base alloy NI-PlOlHT f
8、or aerospace applications. Maximum test temperature o the material 73OoC. 2 References IS0 4095 Fasteners for aerospace construction - Bi-hexagonal wrenching IS0 5855/1 Aerospace construction - MJ threads - Part 1: General IS0 5855/2 Aerospace construction - MJ threads - Part 2: Limit dimensions EN
9、2953 Aerospace series - Heat resisting nickel base alloy(N1-PlOlHT) EN 3220 Aerospace series - Heat resisting nickel base alloy (NI-PlOlHT) EN 2424 Aerospace series - Identification marking of standard configuration requirements for bolts and nuts - bar for hot upset forging 1) bar for continuous fo
10、rging 1) fasteners 2) EN 2786 Aerospace series - Electrolytic silver plating of metals - except titanium, aluminium and their alloys 3) EN 3005 Aerospace series - Nuts, self-locking, in heat resisting nickel alloy NI-PlOlHT (Waspaloy) - Classification 1210 MPa/730C - Technical specification 1) 3 Req
11、uired characteristics 3.1 Configuration - dimensions - tolerances Configuration shall be in accordance with the figure; dimensions, tolerances and masses shall conform with the figure and the table. Details of form, not stated are at the manufacturers option. Dimensions are after coating . 3.2 Mater
12、ial Heat resisting nickel base alloy NI-PlO1HT to EN 2959 or EN 3220. 3.3 Surface treatment Silver coat to EN 2786, coating thickness 5 to 15 . On nuts MJ6 and larger, the coating thickness shall be not less than 5 um, measured at the pitch diameter. rm MJ5 nuts shall show complete coating coverage
13、on the threads. 1) Published as AECMA pre-standard at the date of publication of the present standard. 2) Published as AECMA Standard at the date of publication of the present standard. , 3) In preparation at the date of publication of the present standard. AECMA PREN3637 90 E 10123LL 0006347 5 prEN
14、 3637 Page 4 SELF -LOCKING FEATURE AT MANUFACTURERS OPTION TOOL MARKS ACCEPTABLE. 30“ TO ?/;IV) THESE VALUES ARE TG BE MARKING ON THE FLANGE APPLIED BEFORE SILVER COATING, THREADS SURFACE WILL 6E ACrllEVEil 6Y NORMAL . METHODS OF MANUFACTURE. 8 HEXAGONAL CONFIGURATION IS0 4095 ON - WR E NCHI N G / R
15、 0,3 REMOVE SHARP EDGES 0,l TO 0,4 -1- 6 PLACES Figure - Configuration Table - Dimensions and masses Dimensions in millimetres (1) Bihexagonal configuration in conformity with IS04095 over length “M“ (2) All forms of entry (radius or chamfer) optional within these limiting dimensions (3) Thread in c
16、onformity with IS05855 part 1 and part 2. apply before forming out of round (4) Wrench pad engagement In self-locking zone the tolerances prEN 3637 Page 5 4 Designation Each bihexagonal nut shall only be designated as in the following example: Description block Ldentity block Number of EN Standard N
17、VT-= Thread code 1 Note: I necessary, the design code I9005 may be introduced between the description block and the identity black. 5 Marking Each bihexagonal nut shall be marked in accordance to EN 2424, Class A. 6 Technical specification The bihexagonal nuts shall conform to the requirements of EN 3005.
