1、A.E.C.M.A. STANDARD . prEN 3711 NORME A.E.C.M.A. Issue P 1 A.E,C.M.A. NORM October 1990 Edition approved for publication EDITE PAR LASSOCIATIOk EUROPEENNE DES CONSTRUCTEURS DE MATERIEL 4EROSPATIAL 88, boulevard Malesherbes. 75038 PARIS - TEL 35-63-E2-85 UDC : r C8 Chairman Comments should be sent wi
2、thin six months after rhe date of publicalion decision Key words : ENGLISH VERSION Aerospace series Wrench-double ended, bi-hexagonal straight, cranked, offset Srie arospatiale Cl bihexagonale, double, droite, incline, contre coude Luft- und Raumfahrt Doppelringcchlssel, Doppelsechskant, gerade, abg
3、ewinkelt, flach gekrpft This Aerospace Series pre-standard has been drawn up under ?he responsibility of AECMA (Association Europenne des Construcieurs de Marriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approvedby the experts of the concern
4、ed 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 of the standard. After examination and signat
5、ure of he 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. =+ 1990-10-31 I A.E C.M.A. 88. Bd. hrlalesherbes 4 Mr. WILLIAMS COPYR
6、IGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services1 Scope ond field of applicction This standard specifies the properties of the following types Gf double end box wrenches : double head flat, double head offset and double end m3dified off set.
7、 2 References IS0 691 Wrench. and socket openings- Metric series -Tolerances for EN 2424 EN 3709 general use Aerospace series- Identification triZrking of standard fasteners 1) Aerospace series- Wrenches and sockebbihexogonal-Technical specification 2) 3 Requirmnd characteristics 3.1 Configuration d
8、imensions - tolerances - To see figures 1, 2 and 3 2nd table 1 - Dimensions zre in millimoters - Tolerances for wrench openincs in accordance with IS0 691. 3.2 kterial he meterial quality is left at the manufacturers option. 3.3 Herdness The hercnecs test shall be performed in compliance with EN 370
9、3. The hardness required for double head flat wrenches is es follows : 3.4 Surface treatment 42 f HRC 4 54 Nickel chrollli um deposit Nickel min. thickness 5)J m min. Chromium min. thickness 0,25 U m min. 1) Published es AECMh stendzrd at the date of publication of the present startckrd. 2) Publishe
10、d as AECHA pre-stmdard at the date of publication of the present 8 standzrd, ,- - Previous page is blank A. 40125 14-47 322 COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesprEN 371 1 Page 4 CEN PREN*37LL 90 34045B OOL5LL5 B m 1 5.2.- 5.
11、2 1- E c/ A *- -i Ef L L J. t I CI 1 . COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Servicesi CEN PREN*37LL 901 3404589 OOL5LLb T E prEN 371 1 Page 5 4 Designation I denti :y bl ock Eh 3711 B E9 I Exampl e : Description block Double-hex wren
12、ch Number of EN stendzrd code of dimension accrcss fez Fome code (see Note : If necessary, the ori5intor code 19005 my be introduced between the descritpion block and- the ioent:ty block. s warkihg EN 2424 style C where indiceted in the figure, edditionficl with the uidth ztcrcss flats near the heads. 6 Technic& tpeciflcctlon Et4 3700. COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services
