1、CEN EN*27434 92 - 3LiOLi589 0035387 77T EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 27434 July 1992 UDC 62 1 m2.2 19.7 1.092.5 Descriptors: Fasteners, screws, set screws, specifications, dimensions, dimensional tolerances, designation English version Slotted set screws with cone point (IS0
2、7434 : 1983) Vis sans tte, fendues, bout pointu (IS0 7434 : 1983) Gewindestifte mit Schlitz und Spitze (IS0 7434 : 1983) This European Standard was approved by CEN on 1992-07-17. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this E
3、uropean 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 versions (Engl
4、ish, 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, Belgium, Denmark, F
5、inland, 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 Stassart 36, B- 105
6、0 Brussels O 1992 Copyright reserved to CEN members Ref. No. EN 27434 : 1992 E EN 27434 : 1992 Foreword In 1992, CEN Rchnical Committee CEN/TC 185 Threaded and non threaded mechanical fasteners and accessories the secretariat of which is held by DIN decided to submit the International Standard IS0 7
7、434 : 1983 Slotted set screws with cone point 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 shall be published at the latest by 1993-01-31 and conflicting national standards sh
8、all be withdrawn at the latest by 1993-01-31. According to the CENXENELEC Common Rules the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Spain, Portugal, Sweden
9、 Switzerland and United Kingdom. CEN EM827434 72 - 34YSB 0035383 562 I 1) At present at the stage of draft. Slotted set screws with cone point Page 3 EN 27434 : 1992 1 Scope and field of application This International Standard specifies the characteristics of slotted set screws with cone point and
10、thread sizes 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 - Bolts, sc
11、rews, studs and nuts - Symbols and designations of dimensions. IS0 261, IS0 general 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
12、 metric screw threads - Tolerances. IS0 3269, Fasteners - Acceptance inspection.1) IS0 3506, Corrosion-resistant stainless steel fasteners - Specifications. IS0 4042, Threaded components - Eectroplated coatings components. 11 IS0 4753, Fasteners - Ends of parts with external metric IS0 thread. IS0 4
13、75811, Tolerances for fasteners - Part 1: Botts, screws and nuts with thread diameters 1,6 and 150 mm and product grades A, B and C. Page 4 EN 27434 : 1992 3 Dimensions The 120 angle is mandatory for short length screws above the dotted stepped line. * The 90 angle applies only to the portion of the
14、 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 120 angle is mandatory. Incomplete thread 2 P P Dimensions in millimetres Thread size d M 1.2 M 1.6 M 2 M 2.5 M 3 (M 3,511) M4 M 5 M 6 M 8 M 10 M
15、 12 P2) 0,25 0,35 0.4 0.45 0,5 0.6 0,7 0,8 1 1,25 1,5 1,75 dt - Minor thread diameter - - - - - - - - - - - min. - max. 0,12 0.16 0,2 0.25 0,3 0,35 0,4 0,5 1,5 2 2.5 3 dt3) nom. 0,2 0,25 025 0,4 0,4 O, 5 0,6 0,8 1 12 1.6 2 n min. 026 0.31 0.31 0,46 0,46 0.56 0.66 0,s 1.06 1,26 1,66 2,06 max. 0.4 0.4
16、5 0,45 0,6 0.6 0,7 0,s 1 12 1,51 1,91 2.31 min. 0,4 I 0.56 I 0,64 1 0,72 I 0.8 I 0,96 I 1,12 I 1,28 I 1,6 I 2 I 2,4 I 2.8 max. I 0.52 I 0,74 I 0.84 I 0.95 I 1.05 1 1.21 I 1,42 I 1.63 I 2 I 2.5 I 3 I 3.6 /i), 4) nom. I min. I max. 56 54,4 55.6 60 59,4 60,6 1) Sizes in brackets should be avoided if po
17、ssible. 2) P = pitch of the thread. 3) M5 no flat part on the cone required: the point may be slightly rounded. 4) Min. and max. values according to IS0 475911. but rounded to one decimal place. CEN ENS27434 92 3404589 0035391 110 = Tolerance International Standards Property class International Stan
18、dards Thread Mechanical properties Page 5 EN 274.34 : 1992 69 IS0 261, IS0 965 14H. 22H Al -50 1) IS0 898/5 I IS0 3506 4 Specifications and reference International Standards Product grade International Standard Tolerances A IS0 475911 Plain Finish Requirements for electroplating are covered in IS0 4
19、042. If different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between supplier and customer. I Acceptability I The acceptance procedure is covered in IS0 3269. 1) Will be covered in a future International Standard. 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
