1、DEUTSCHE NORM October 1994 Cross recesses for screws English version of DIN EN IS0 4757 (IS0 4757 : 1983) DIN EN IS0 475 This standard incorporates the English version of Is0 4757 ICs 21.060.1 O Descriptors: Fastener, screw, cross recessed head, dimensions. Kreuzschlitze fr Schrauben (IS0 4757: 1983
2、) European Standard EN IS0 4757: 1994 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been published in accorcnce with a decision taken by CENiTC 185 IS0 4757 as a European Standard. 3 ado1 Supersedes DIN 7962, December 1984 edition. 1 srn
3、ationa Standard The responsible German body involved in its preparation was the Normenausschu Mechanische Verbindungselemente (Fasteners Standards Committee). It should be noted, however, that appendix A of DIN 7962 has been omitted. This standard conforms in substance to DIN 7962 (now withdrawn), e
4、xcept that the depth gauge dealt with in its appendix is no longer specified. Amendments DIN 7962, December 1984 edition, has been superseded by the specifications of EN IS0 4757: 1994. Previous editions DIN 7962-1: 1959-08; DIN 7962-2: 1959-08, 1962-03; DIN 7962: 1952-07, 1984-12. International Pat
5、ent Classification F 16 B 023/00 G O1 B 021/00 EN comprises 10 pages. Beuth Veerlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). DIN EN IS0 4757 Engl. Price group 8 03.95 Sales No. 1iO EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE NORM EN IS0 4757 July 1994 UDC 62
6、1.882.215.8 Descriptors: Fastener, screw, cross recessed head, dimensions. English version Cross recesses for screws (IS0 4757: 1983) Empreintes cruciformes pour vis (IS0 4757 : 1983) Kreuzschlitze fr Schrauben (IS0 4757: 1983) This European Standard was approved by GEN on 1994-07-26 and is identica
7、l to the IS0 Standard as referred to. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipu- late the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographicai references concerning such
8、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, German). A version in any other language made by translation under the responsibility of a CEN member into its own language an
9、d notified to the Central Secretariat has the same status as the official versions. GEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United
10、Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-I050 Brussels O 1994. Copyright reserved to all CEN members. Ref. No. EN ISO4757:1994 E Page 2 EN IS0 4757: 1994 Foreword International Standar
11、d IS0 4757 : 1983 Cross recesses for screws has been taken over as a European Standard by Technical Committee CENTTC 185 Threaded and non-threaded mechanical fasteners and accessories from the work of ISO/TC 2 Fasteners of the International Organization for Standardization (ISO). This European Stand
12、ard shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by January 1995 at the latest. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this
13、 European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Standard IS0 4757:1983 was approved by CEN as a Europea
14、n Standard without any modifica- tion. Page 3 EN IS0 4757: 1994 1 Scope and field of application This International Standard defines two types of cross recesses for screws: - recess type H; - recess type Z. Included in this International Standard is a method of penetration gauging for both types. 2
15、Recess type H 2.1 Dimensions B-B Page 4 EN IS0 4757 : 1994 Recess No. o 1 2 b - O 0.03 0,61 0.97 1.47 g + 0,m O 0,81 1.27 2.29 e 0.26 - 0,s 0.41 - 0.46 0.79 - 0,84 J 0,31 - 0,36 0.51 - 0.56 0,66 - 0,74 r nom. 0.3 03 0,6 3 4 2,41 3.48 1.98 - 2,03 2,39 - 2.44 3.81 5P 0.79 - 0.86 1,19 - 1,27 03 1 tl re
16、f. O - 15 a + 15 O 2.2 Recess penetration gauging and gauge dimensions for recess type H The penetration depth of the depth gauge (minimum dimension) is indicated in the different product standards. It is the test dimen- sion for the usability of the cross recess. 022 O. 34 0.61 1 ,o1 1.35 1) 138O 1
17、400 1460 1 53“ 70 70 50 45 50 45 70 The point of the gauge is identical with the point of the respective screwdriver. A sleeve serves to guide the gauge and fix the reference plane. This plane passes through the point of intersection of the recess wings and the top surface of the screw head. It cor-
18、 responds thus to the surface of a screw with flat head. In the case of crowned screw heads, it lies below the crown in the transition area from the recess wings to the surface of the head. For these screw heads, the reference plane is fixed with the help of the bearing surfaces of the gauge sleeve.
19、 The penetration depth of the gauge is measured from the reference plane by using a dial gauge. The zero and control positions of the depth gauge can be found on a flat surface. Due to the permissible error for the core thickness 6 of the gauge point, an inaccuracy of up to 0,13 mrn can arise when m
20、easuring the penetration depth. Page 5 EN IS0 4757 : 1994 1 Gauge 7 Reference plane 1 Zero position LT Control position Page 6 EN IS0 4757 : 1994 O - 0,025 t 0,025 b g O d + 913 Minimum length of true form 0.64 1,001 1,- 2,497 3,574 0,813 127 2.m 3,81 5308 0.25 0.38 0.38 0.38 0,s yo0 /- O - 0,025 O
21、e f - 0.06 I min. a + 1: v C 0,315 0,513 1,102 2,098 2,738 0,31 0.51 0,79 1,12 3,17 3.17 4.78 7,14 8,74 1) 1 380 1400 1460 153O A- A O 70 Table 2 - Gauge dimensions for recess type H Dimensions in millimetres 70 50 45 50 45 70 I-Gauge NO. 1 o I 1 I 2 I 3 I 4 I - 15 I Page 7 EN IS0 4757 : 1994 3 Rece
22、ss type Z 3.1 Dimensions c-c Page 8 EN IS0 4757: 1994 Recess No. O O. 76 b f - O 0.025 0.48 O - 0.05 g - 0.05 0,s O rr max. 0.30 1 2 3 4 1,27 1 ,a 2.72 3.96 132 23 3.86 5.08 0,74 1 ,o3 1.42 2,16 0.30 0.38 0.51 0.64 j max. (I + 1: 0,13 0.15 0.15 0.20 0,20 70 70 50 45 50 45 JO - 15 Y - 15 6 O O O -7 7
23、0 45 70 45 6O 20 6O 20 70 45 40 23 40 23 30 30 40 23 460 460 460 560 15 560 15 Page 9 EN IS0 4757 : 1994 3.2 Recess penetration gauging and gauge dimensions for recess type Z The penetration depth of the depth gauge (minimum and maximum dimension) is indicated in the different product standards. It
24、is the test dimension for the usability of the cross recess. The point of the gauge is identical with the point of the respective screwdriver. A sleeve serves to guide the gauge and fix the reference plane. This plane passes through the point of intersection of the recess wings and the top surface o
25、f the screw head. It cor- responds thus to the surface of a screw with flat head. In the case of crowned screw heads, it lies below the crown in the transition area from the recess wings to the surface of the head. For these screw heads, the reference plane is fixed with the help of the bearing surf
26、aces of the gauge sleeve. The penetration depth of the gauge is measured from the reference plane by using a dial gauge. The zero and control positions of the depth gauge can be found on a flat surface. 1 Gauge Reference plane Zero position “r Control position Page 1 O EN ISO4757:1994 T-7 showing rib detail for No. O and 1 gauges showing rib detail for No. 2,3 and 4 gauges S enlarged partvw Minimum length of true fomi Q enlarged part view Table 4 - Gauge dimensions for recess type Z Dimensions in millimetres
