1、Ref. No. DIN 74 : 2003-04English price group 05 Sales No. 010501.04DEUTSCHE NORM April 200374Continued on pages 2 to 4. No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclu
2、sive right of sale for German Standards (DIN-Normen).Countersinks for countersunk head screws(except screws with DIN EN 27721 head)Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.ICS 21.060.01Senkungen fr Senkschrauben (a
3、usgenommenSenkschrauben mit Kpfen nach DIN EN 27721)In keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.ForewordThis standard has been prepared by Technical Committee Fachgrundnorme
4、n of the NormenausschussMechanische Verbindungselemente (Fasteners Standards Committee).AmendmentsThis standard differs from DIN 74-1, November 2000 edition, in that table 3 has been amended.Previous editionsDIN 74-1: 1971-07, 1980-12, 2000-11.All dimensions are in millimetres.1 ScopeThis standard s
5、pecifies dimensions and designation of countersinks for countersunk head screws as inDIN 95, DIN 97, DIN 7969, DIN 7995, DIN 7997, and DIN EN ISO 10642.NOTE: Countersinks for countersunk head screws with DIN EN 27721 head are specified in DIN 66.2 Normative referencesThis standard incorporates, by d
6、ated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this standard
7、 only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.DIN 66 Countersinks for countersunk head screws with ISO 7721 common head styleDIN 95 Slotted raised countersunk (oval) head wood screwsDIN 97 Slotted countersunk
8、(flat) head wood screwsDIN 7969 Slotted countersunk head screws for structural steel bolting for supply with or without nutDIN 7995 Cross recessed raised countersunk head wood screwsDIN 7997 Cross recessed countersunk head wood screwsSupersedes DIN 74-1,November 2000 edition.Page 2DIN 74 : 2003-04DI
9、N EN 20273 Fasteners Clearance holes for bolts and screws (ISO 273 : 1979)DIN EN 27721 Countersunk head screws Head configuration and gauging (ISO 7721 : 1983)DIN EN ISO 10642 Hexagon socket countersunk head screws (ISO 10642 : 1997)3 Dimensions and designationCountersink dimensions shall be as give
10、n in figures 1 to 3 and tables 1 to 3.3.1 Type A, for countersunk head wood screws as in DIN 97 and DIN 7997, and raised countersunk headwood screws as in DIN 95 and DIN 7995Figure 1: Type A countersink dimensions (notation)Designation of a countersink of type A for a 4 mm screw thread diameter:Coun
11、tersink DIN 74 A4Table 1: Type A countersink dimensionsThread size 1,6 2 2,5 3 3,5 4 4,5 5 5,5 6 7 8d11) (H13) 1,8 2,4 2,9 3,4 3,9 4,5 5,5 15,5 16,5 16,6 17,6 19,1d2(H13) 3,7 4,6 5,7 6,5 7,6 8,6 9,5 10,4 11,4 12,4 14,4 16,4t1(approx.) 0,9 1,1 1,4 1,6 1,9 2,1 2,3 12,5 12,7 12,9 13,3 13,71) Diameter o
12、f clearance hole, medium series, as in DIN EN 20273.3.2 Type E, for countersunk head screws as in DIN 7969Figure 2: Type E countersink dimensions (notation)Designation of a countersink of type E for a 12 mm screw thread diameter:Countersink DIN 74 E12Page 3DIN 74 : 2003-04Table 2: Type E countersink
13、 dimensionsThread size 10 12 16 20 22 24d11) (H13) 10,5 13 17 21,5 23 25d2(H13) 19,5 24 31 34,5 37 40t1(approx.) 15,5 17 19 11,5 12 13a t1 75 601) Diameter of clearance hole, medium series, as in DIN EN 20273.3.3 Type F, for hexagon socket countersunk head screws as in DIN EN ISO 10642Figure 3: Type
14、 F countersink dimensions (notation)Designation of a countersink of type F for a 12 mm screw thread diameter:Countersink DIN 74 F12Table 3: Type F countersink dimensionsThread size 3 4 5 6 8 10 12 14 16 20d11) (H13) 3,44 4,5415,5416,6119,41 11,41 13,51 15,51 17,51 22,41d2(H13) 6,94 9,18 11,47 13,71
15、18,25 22,73 27,21 31,19 33,99 40,71t1(approx.) 1,84 2,3413,0413,6114,6115,9116,9117,8119,2119,41a t1 901) Diameter of clearance hole, medium series, as in DIN EN 20273.3.4 Other depths of countersinkWhere countersinks of depth, t1, deviating from that given in tables 1 to 3 are required (e.g. 3 mm f
16、or an A4countersink), this shall be indicated in the designation.EXAMPLE:Designation of a countersink of type A, with a depth, t1, of 3 mm, for a 4 mm screw thread diameter:Countersink DIN 74 A4 3Page 4DIN 74 : 2003-044 Indications on drawingsIndications on drawings shall be as shown in figures 4a to 4d.EXAMPLE 1: Use of symbolsFigure 4a: Indication of symbolsEXAMPLE 2: Indication of actual dimensionsFigure 4b: Indication of countersink diameterFigure 4c: Indication of countersink depthFigure 4d: Indication for components where s t1
