1、UDC 621.882.4 : 621.882.6 DEUTSCHE NORM October 1992 EN Standard Plain washers for use with clevis pins, product grade A (IS0 8738 : 1986) English version of DIN EN 28 738 DIN EN Standard Title Previous DIN Standard I EN28738 22 340 22 341 28 738 Scheiben fr Bolzen; Produktklasse A (IS0 8738 : 1986)
2、 22 340 22 341 28 738 Clevis pins without head Clevis pins with head Plah washers for use with clevis pins; product grade A This standard incorporates the English version of Is0 8738. Supersedes DIN 1440, July 1974 edition. European Standard EN 28 738 : 1992 has the status of a DIN Standard. A comma
3、 is used as the decimal marker. National foreword The publication of this standard is in keeping with a decision made by CEN/TC 185 to adopt, without alteration, a series of IS0 Standards covering clevis pins and washers for use with clevis pins as European Standards. The responsible German body inv
4、olved in their publication is the NormenausschuMechanische Verbindungselemente (Fasteners Standards Committee). As a consequence, all DIN Standards covering such pins and washers have been superseded by the corresponding DIN EN Standards (see table below). 1443 1444 1 1440 See National appendix for
5、guideline values for the mass of washers not given in the European Standard. The DIN Standards corresponding to the IS0 Standards referred to in clause 2 of the EN are as follows: IS0 Standard DIN Standard IS0 2081 DIN 50 961 IS0 3269 The DIN 4000-3-1 tabular layout of article characteristics applie
6、s for washers as covered here. DIN IS0 3269 (at present at the stage of draft) IS0 4759-3 DIN 522 Continued overleaf. EN comprises 5 pages. Beuth Verlag GmbH. Berlin, has the exclusive right of sale for German Standards (DIN-Normen) 04.93 DIN EN 28 738 Engl. Price group 6 Sales No. 1106 Page 2 DIN E
7、N 28 738 Standards referred to (and not included in References) DIN 522 Metal washers; technical delivery conditions DIN 4000 Part 3 Tabular layout of article characteristics for plain washers and lock washers DIN 50 961 Chromating of zinc and cadmium coatings on iron and steel Previous editions DIN
8、 LON 252: 07.26; DIN 1440: 07.28x, 07.74. Amendments In comparison with DIN 1440, July 1974 edition, the following amendments have been made. a) Some sizes have been dropped and some values of d, amended. c) The values of h have been amended for the nominal sizes of 5 mrn, 45 mm, 55 mm, 60 mm and 10
9、0 mm. d) The surface roughness and the material hardness have been specified. e) The standard designation has been changed. Guideline values for the mass of washers have been given in a National appendix. International Patent Classification F 16 0 43/00 EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE
10、NORM EN 28 738 July 1992 UDC 621.882.4: 621.882.6 Descriptors: Fasteners, clevis pins, washers, plain washers, specifications, dimensions, designation. English version Plain washers for clevis pins - Product grade A (IS0 8738 : 1986) Rondelles plates pour axes darticula- tion; grade A (IS0 8738 : 19
11、86) Scheiben fr Bolzen: Produktklasse A (IS0 8738 : 1986) This European Standard was approved by CEN on 1992-07-17 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Sta
12、ndard 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 official versions (English, French
13、, German). Aversion in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, Fran
14、ce, 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 de Stassart 36, 8-1050 Brussels O
15、1992. Copyright reserved to all CEN members. Ref. No. EN 28 738 : 1992 E Page 2 EN 28 738 : 1992 Foreword In 1992, CEN/TC 185 Threaded and unthreaded fasteners and accessories, the Secretariat of which is held by DIN, decided to submit International Standard IS0 8738 : 1986 Plain washers for clevis
16、pins - Product grade A to Formal Vote. The result was positive. In the countries bound to implement this European Standard, a national standard identical to this European Standard shall be published, and conflicting national standards withdrawn, by 1993-01 -31 at the latest. In accordance with the C
17、ENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice Th
18、e text of the International Standard IS08738 : 1986 was approved by CEN as a European Standard without any modifi- cation. Page 3 EN 28 738 : 1992 1 Scope and field of application This International Standard specifies the characteristics of plain washers for clevis pins according to IS0 2340 and IS0
19、 2341. Plain washers in accordance with this International Standard shall be used on the cotter pin end only. 2 References IS0 2081, Metallic coatings - Electropfated coatings of zinc on iron or steel. IS0 2340. Clevis pins without head. IS0 2341, Clevis pins with head. IS0 3269, Fasteners - Accepta
20、nce inspection. IS0 4520, Chromate conversion coatings on eectrop8ted zinc and cadmium coatings. IS0 475813, Tolerances for fasteners - Part 3 : Washers for metric bolts, screws and nuts with thread diameters from 1 up to and including 150 mrn - Product grades A and C. Page 4 EN 28 738 : 1992 Hole d
21、iameter dl Nominal size d nom. (min.) i max. 3 Dimensions Outside diameter Thickness h nom. I max. I min. d2 nom. max.) I min. Surface roughness values in micrometres 3 4 5 I 3 3,14 6 5.70 0.8 0.9 0.7 4 4,18 8 7,a 0.8 or9 0,7 5 5,18 10 9,M 1 1,1 0.9 6 8 10 6 6,18 12 11.57 1.6 1,8 1.4 8 8.22 15 14.57
22、 2 22 1.8 10 10,22 18 17.57 2,5 2,7 2.3 12 12 12.27 a) 19.48 3 3,3 14 16 18 18 18.27 28 27.48 4 2a 20 20,s 30 =,a 4 P 22 223 34 =.a 4 24 24 24.33 37 363 4 27 27 27,s 39 38 5 30 30 30.52 44 43 5 4,3 3,7 5.6 4,4 5.6 4.4 33 33 33, 47 46 5 5.6 4.4 36 36 50 49 6 6.6 5,4 40 40 40.62 58 54,8 6 6.6 5-4 al 6
23、0 ao m I 90 90 100 100 I 60,74 78 76.8 10 11 9 70.74 92 90.6 10 11 9 80.74 98 96.6 12 13,2 10,8 90,m 110 108,6 12 13,2 10.8 100,m 120 118.6 12 13,2 10.8 Page 5 EN 28 738 : 1992 Material 4 Specifications and reference International Standards St = Steel, Other materials as agreed between customer and
24、supplier. hardness 160 to 250 HV (class 160 HV). Plain, .e. washers to be supplied in natural finish, treated with a rust-preventative lubricant, unless otherwise specified by agreement beiween customer and supplier. Preferred coatings are black oxide, phosphate coating or zinc plating with chromate
25、 conversion coating (see IS0 X81 and IS0 mi. Other coatings as agreed between customer and supplier. Product grade A to IS0 475913. I mierances shall appiy pior to the application a piating or coating. Workmanship Acceptability hrfsce inirh Parts shall be uniform in qual and free of irregularities o
26、r detrimental defects. No burrs shall appear on any part of the washer. The acceptance procedure is covered in IS0 3269. Nominal size, d 3 4 5 6 8 io 12 14 16 18 20 22 24 27 30 33 36 40 45 50 55 60 70 80 90 100 Approximate mass (7,85 kg/dms), in kg per 1000 units 0,13 0,23 0,36 1 ,O5 1,98 3,45 4,74 533 5,92 11.3 1 2,3 1 6,6 1 9,6 24,4 31,9 34,5 445 56,8 58,3 91.5 106 153 220 237 296 326 5 Designation Example for the designation of a plain washer with nominal size 8, property dass 160HV : Washer IS0 8736 - 8 - 1BoHV
