1、June 2012 Translation by DIN-Sprachendienst.English price group 6No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 21
2、.060.10!%_:“2026023www.din.deDDIN 925Slotted countersunk head screws with dog point (flat head),English translation of DIN 925:2012-06Senkschrauben mit Schlitz und Zapfen,Englische bersetzung von DIN 925:2012-06Vis tte fraise, fendue, tton,Traduction anglaise de DIN 925:2012-06SupersedesDIN 925:2006
3、-08www.beuth.deDocument comprises 7 pagesIn case of doubt, the German-language original shall be considered authoritative.08.13 DIN 925:2012-06 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Symbols . 5 4 Dimensions 5 5 Technical delivery
4、 conditions . 7 6 Designation . 7 DIN 925:2012-06 3 Foreword This standard has been prepared by Working Committee NA 067-00-08 AA Verbindungselemente mit Sonderformen und aus Kunststoff of the Normenausschuss Mechanische Verbindungselemente (FMV) (Fasteners Standards Committee). Attention is drawn t
5、o the possibility that some elements of this document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent rights. The DIN 4000-160-3 tabular layout of article characteristics applies to screws covered in this standard. Amendments The standard
6、 differs from DIN 925:2006-08 as follows: a) normative references have been updated; b) Clause 3 on symbols has been included; c) the minimum dimension for k has been included in Table 1; d) according to DIN EN ISO 225, dimension l2has been changed to z; e) the following symbols have been changed: r
7、1to r, r2to rz; f) radius rehas been included, replacing dimension z; g) in Table 2, property class 4.8 has been restricted to thread sizes from M1,6; h) in Table 2, footnote a has been deleted and its content included under “Mechanical properties”. Previous editions DIN 925: 1943-01, 1953-08, 1972-
8、08, 1986-09, 2006-08 DIN 925:2012-06 4 1 Scope This standard specifies characteristics for M1,4 to M3 slotted countersunk head screws with dog point (flat head) in product grades F and A. 2 Normative references The following referenced documents are indispensable for the application of this document
9、. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 267-6, Fasteners Technical specifications, finishes and tolerances for product grade F DIN 962, Bolts, screws, studs and nuts Designat
10、ion, types and finishes DIN 4000-160, Tabular layout of product properties Part 160: Fasteners with external thread DIN EN 10087, Free-cutting steels Technical delivery conditions for semi-finished products, hot-rolled bars and rods DIN EN 10277-3, Bright steel products Technical delivery conditions
11、 Part 3: Free-cutting steels DIN EN 26157-1, Fasteners Surface discontinuities Bolts, screws and studs subject to general requirements DIN EN 28839, Mechanical properties of fasteners Nonferrous metal bolts, screws, studs and nuts DIN EN ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and d
12、escriptions of dimensions DIN EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch thread DIN EN ISO 3269, Fasteners Acceptance inspection DIN EN ISO 3506-1, Mechanical prope
13、rties of corrosion-resistant stainless steel fasteners Part 1: Bolts, screws and studs DIN EN ISO 4042, Fasteners Electroplated coatings DIN EN ISO 4753, Fasteners Ends of parts with external ISO metric thread DIN EN ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product
14、grades A, B and C DIN EN ISO 16048, Passivation of corrosion-resistant stainless-steel fasteners DIN ISO 965-1, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data DIN ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts DIN 925:2012-06 5 3 Sym
15、bols The following symbols apply for slotted countersunk head screws with dog point: l1nominal length (excluding dog point) rzradius between dog point and thread Other relevant symbols and their descriptions are specified in DIN EN ISO 225. 4 Dimensions See Figure 1 and Table 1. Key 1 End rounded (R
16、N) as in DIN EN ISO 4753 aTop edge of head rounded or chamfered (optional). bre 1,4 d. cFor M3. dFor M3. Figure 1 Slotted countersunk head screws with dog point DIN 925:2012-06 6 Table 1 Dimensions Dimensions in millimetres Thread size (d) M1,4 M1,6 M2 M2,5 M3 Pa0,3 0,35 0,4 0,45 0,5 a max. 0,6 0,7
17、0,8 0,9 1,0 dkmax. (nominal size) 2,60 3,00 3,80 4,70 5,60 min. 2,35 2,75 3,50 4,40 5,30 dpmax. (nominal size) 0,800 0,800 1,200 1,500 2,000 min. 0,775 0,775 1,175 1,475 1,975 k max. 0,84 0,96 1,20 1,50 1,65 min. 0,59 0,71 0,95 1,25 1,40 n Nominal size 0,3 0,4 0,5 0,6 0,8 max. 0,50 0,60 0,70 0,80 1,
18、00 min. 0,36 0,46 0,56 0,66 0,86 r max. 0,14 0,16 0,20 0,25 0,30 rzmax. 0,1 0,1 0,1 0,1 0,1 t max. 0,40 0,45 0,60 0,70 0,85 min. 0,28 0,32 0,40 0,50 0,60 l1Nominalsize Tolerance 1,6 js15 for l1+ z 2 2,5 (3) 4 (5) 6 z Nominal size min. max. 0,6 0,6 0,85 1 1 1,25 1,6 1,6 1,85 2 2 2,25 2,5 2,5 2,75 (3)
19、 3 3,25 The range of commercially available lengths l1and z is between the stepped continuous lines. Bracketed sizes l1and z should be avoided if possible. aP is the thread pitch. DIN 925:2012-06 7 5 Technical delivery conditions See Table 2. Table 2 Technical delivery conditions Material Steel Stai
20、nless steel Nonferrous metal General requirements DIN ISO 8992 Thread Tolerance class 6g Standard DIN ISO 965-1 Mechanical properties Property class (material) d M1,6: subject to agreement M1,6 d M3: 4.8 A1-50 A1-70 CU2 CU3 Standards DIN EN ISO 898-1 DIN EN 10087 DIN EN 10277-3 DIN EN ISO 3506-1 DIN
21、 EN 28839 Limit deviations, geometrical tolerances Product grades M1,4: F M1,6: A Standards DIN 267-6, DIN EN ISO 4759-1 Surface finish Coating As processed. Passivation in accordance with DIN EN ISO 16048. Plain. DIN EN ISO 4042 applies with regard to electroplating. DIN EN ISO 4042 applies with re
22、gard to electroplating. Surface discontinuities DIN EN 26157-1 applies to tolerances for surface discontinuities. Acceptance inspection DIN EN ISO 3269 applies with regard to acceptance inspection. 6 Designation EXAMPLE Designation of an M2 slotted countersunk head screw with dog point, with a nominal length (excluding dog point) l1of 2,5 mm and a dog point length z of 1,6 mm, assigned to property class 4.8: Countersunk head screw DIN 925 M2 2,5 1,6 4.8 See DIN 962 for supplementary order designations for special screw types and finishes.
