1、CEN ENx28738 92 m 3404589 0033044 877 m EUROPEAN STANDARD EN 28738 NORME EUROPENNE EUROPISCHE NORM July 1992 CLIC 621.882.4 : 621.882.6 Descriptors: Fasteners, hinge pins, washers, plain washers, specifications, dimensions, designation English version Plain washers for clevis pins - Product grade A
2、(IS0 8738 : 1986) Rondelles plates pour axes darticulation - Grade A (IS0 8738 : 1986) Scheiben fr Bolzen - Produktklasse A (IS0 8738 : 1986) This European Standard was approved by CEN on 1992-07-17. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the condit
3、ions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three o
4、fficial versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat ha5 the same status as the official versions. CEN members are the national standards bodies of Austri
5、a, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue
6、de Stassart 36, B- 1050 Brussels O 1992 Copyright reserved to CEN members Ref. No. EN 28738 : 1992 E CEN ENx28738 92 3404589 0033045 703 Page 2 EN 28738 : 1992 Foreword In 1992, CEN Technical Committee CENITC 185 ?Threaded and non threaded mechanical fasteners and accessories? the secretariat of whi
7、ch is held by DIN decided to submit the International Standard IS0 8738 : 1986 ?Plain washers for clevis pins - Product grade A? to the formal vote procedure. The result was positive. In the countries bound to implement this European Standard a national standard identical to this European Standard s
8、hall be published at the latest by 1993-01-31 and conflicting national standards shall be withdrawn at the latest by 1993-01-31. According to the CENICENELEC Common Rules the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greec
9、e, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Spain, Portugal, Sweden, Switzerland and United Kingdom. Page 3 EN 28738 : 1992 Plain washers for clevis pins - Product grade A Hole diameter max. dl Nominal size d nom. (min.) I CEN ENx28738 72 3404589 0033047 58b Page 4 EN 28738 : 1992 3
10、 Dimensions Outside diameter min. d2 nom. max.) 1 Surface roughness values in micrometres I 5 5 Dimensions in millimetres 9.64 5,18 I 10 6 6 6.18 I 12 11.57 14)57 I I io I 10.22 18 I 17.57 8 10 12 14 16 12 12,27 20 19,48 14 14,27 22 21,48 16 16.27 24 23,48 1 Thickness h nom. I rnax. I min. 3 3.3 2.7
11、 3 3 18 22 a) 24 24 2433 27 27,52 30 I 1 30,52 28 4 4.3 3.7 30 34 3.7 I 44 39 Is I 15: 1 t:. 37 363 4 4.3 CEN ENx28738 92 3q04589 00330Y8 412 Page 5 EN 28738 : 1992 4 Specifications and reference International Standards Material St = Steel, hardness 160 to 250 HV (class 160 HV). I Other materials as
12、 aareed between customer and supplier. Tolerances I Product grade A to IS0 4759/3. All tolerances shall apply prior to the application of a plating or coating. Surface finish Workmanship I Plain, .e. washers to be supplied in natural finish, treated with a rust-preventative lubricant, unless I other
13、wise specified by agreement between customer and supplier. Preferred coatings are black oxide, phosphate coating or zinc plating with chromate conversion coating (see IS0 2331 and IS0 4520). Other coatings as agreed between customer and supplier. Parts shall be uniform in quality and free of irregularities or detrimental defects. No burrs shall amear on anv Dart of the washer. Acceptability The acceptance procedure is covered in IS0 3269. 5 Designation Example for the designation of a plain washer with nominal size 8, property class 1HV : Washer IS0 8738 - 8 - 1HV
