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1、EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE NORM EN 27 434 July 1992 UDC 621.882.219.71 .O925 Descriptors: Fasteners, screws, set screws, dimensions, specifications, dimensional tolerances, designation. English version Slotted set screws with cone point (IS0 7434 : 1983) Vis sans tte, fendues, bou
2、t pointu (IS0 7434 : 1983) Gewindestifte mit Schlitz und Spitze (IS0 7434 : 1983) 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
3、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 official v
4、ersions (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 has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgiu
5、m, 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 de Stassa
6、rt 36, B-1050 Brussels O 1992. Copyright reserved to all CEN members. Ref. No. EN 27 434 : 1992 E Page 2 EN 27 434 : 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 7434 : 1983
7、Slotted set screws with cone point 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a national standard identical to this European Standard shall be published, and conflicting national standards withdrawn, by 1993-01-31 at the latest.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
8、 with the CENKENELEC 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. Endorsemen
9、t notice The text of the International Standard IS0 7434 : 1983 was approved by CEN as a European Standard without any modifi- cation. Page 3 EN 27 434 : 1992 1 Scope and field of application This International Standard specifies the characteristics of clotted set screws with cone point and thread s
10、izes from M 1,2 to M 12 inclusive and product grade A. if other specifications are required, it is recommended that they should be selected from existing International Standards, for example IS0 261, IS0 888, IS0 898, IS0 965, IS0 3506. IS0 4759/1. 2 References IS0 225, Fasteners - Botts, screws, st
11、uds and nuts - Symbols and designations of dimenSonS. IS0 261, IS0 generd purpose metric screw threads - General plan. IS0 888, Bolts, screws and studs - Nominal lengths, and thread lengths for general purpose bolts. IS0 898. Mechanical properties of fasteners. IS0 965, IS0 general purpose metric sc
12、rew threads - Tolerances. IS0 3269, Fasteners - Acceptance inspection.1) i SO 3506. Corrosion-resistant stainless steel fasteners - Specifications. IS0 4042, Threaded components - Uectroplated coatings components. 1) IS0 4753, Fasteners - Ends of parts with external metric IS0 thread. IS0 475911, To
13、lerances for fasteners - Part I: Bolts, screws and nuts with thread diameters 1.6 and 150 mm and product grades A, 8 and C. 1 I At present at the stage of draft. -,-,- Page 4 EN 27 434 : 1992 Thread size d M1.2 M1.6 M 2 M2.5 M3 (M3.511) M4 M6 M 6 M8 P2) 0.25 0.35 0,4 0 , 4 5 0.5 0,s 0,7 0,8 1 1.25 3
14、 Dimensions The 120 angle is mandatory for short length screws above the dotted stepped line. * The Wo angle applies only to the portion of the point below the root diameter of the thread with nominal lengths I below the dotted stepped line. For short length screws above the dotted stepped line a 12
15、0 angle is mandatory. M10 M12 1,5 1,75 t min. max. df dr3) Minor thread diameter - - - - - - - - - - - - 0,12 I 0.16 I 0.2 I 0.25 I 0,3 I 0 . 3 5 I 0,4 I 0.5 I 1,5 I 2 I 2.5 I 3 1) Sites in brackets should be avoided if possible. 2) P = pitch of the thread. 3) M5 no flat part on the cone required; t
16、he point may be slightly rounded. 4) Min. and max. values according to IS0 4759/1, but round+ to one decimal place. n min. max. min. max. t I), 4) nom. I min. I max. O,= 0,31 0.31 0.46 0.46 0.56 0,66 0,86 1,06 1,2 1.66 2.06 0.4 O,& 0.46 0 . 6 0.6 0.7 0.8 1 1 2 1,51 1,91 2,31 2.4 2,8 0,4 0,s 0 . 6 4
17、0.72 0.8 0,96 1,12 1.28 1,6 2 0,52 0.74 0.84 0.95 1,05 1,21 1.42 1,ai 2 2,5 3 3 , 6 Page 5 EN 27 434 : 1992 Material Thread Tolerance International standards 4 Specifications and reference International Standards I Stainless steel Non-ferrous metal Steel 69 IS0 261. IS0 966 Propem class Internationa
18、l Standards Mechanical propertiee 14H, 22H Al - 50 1) IS0 m/5 I IS0 3506 I Tolerances I Acceptability Product grade I A International Standard I IS0 47!339/1 If different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between suppl
19、ier and customer. The acceptance procedure is covered in IS0 3269. Plain Requirements for electroplating are covered in IS0 4042. I Finish I 5 Designation Example for the designation of a slotted set screw with cone point, thread size d = M5, nominal length I = 12 mm and property class 14H: Set screw IS0 7434 - M5 x 12 - 14H National appendix (informative) Mass of set screws The values given are guideline values. -,-,-