1、December 2016 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 21.060.10!%dp“2655977www.din.deD
2、IN 7997Cross recessed countersunk head wood screws,English translation of DIN 7997:2016-12Senk-Holzschrauben mit Kreuzschlitz,Englische bersetzung von DIN 7997:2016-12Vis bois tte conique bombe empreinte cruciforme,Traduction anglaise de DIN 7997:2016-12SupersedesDIN 7997:2010-12www.beuth.deDocument
3、 comprises 8 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.05.17 DIN 7997:2016-12 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope 4 2 Normative references 4 3 Dimensions 5 4 Technical delivery cond
4、itions . 7 5 Designation 7 Bibliography . 8 DIN 7997:2016-12 3 Foreword This standard has been prepared by Working Committee NA 067-00-05 AA Kleinschrauben und gewindeformende Schrauben of DIN-Normenausschuss Mechanische Verbindungselemente (DIN Standards Committee Fasteners). The DIN 4000-160-10 ta
5、bular layout of product properties applies to screws covered in this standard. Attention is drawn to the possibility that some of the 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. Amendments This standa
6、rd differs from DIN 7997:2010-12 as follows: a) Clause 1 “Scope” has been revised; b) the standard has been editorially revised; c) in Table 1, the number of decimal places after the comma has been unified; d) technical delivery conditions, including entries on “Material”, have been updated in Table
7、 2. Previous editions DIN 7997: 1953-09, 1959-08, 1975-03, 1984-12, 2010-12 DIN 7997:2016-12 4 1 Scope This standard specifies properties for cross recessed countersunk head wood screws with a thread diameter from 2 mm to 8 mm for use in applications which do not require construction approval. 2 Nor
8、mative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments
9、) applies. DIN 7998, Threads and thread ends for wood screws DIN EN 12166, Copper and copper alloys Rods for general purposes DIN EN 26157-1, Fasteners Surface discontinuities Bolts, screws and studs subject to general requirements DIN EN ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and
10、descriptions of dimensions DIN EN ISO 3269, Fasteners Acceptance inspection DIN EN ISO 3506-4, Mechanical properties of corrosion-resistant stainless steel fasteners Part 4: Tapping screws DIN EN ISO 4042, Fasteners Electroplated coatings DIN EN ISO 4757, Cross recesses for screws DIN EN ISO 4759-1,
11、 Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C DIN EN ISO 16048, Passivation of corrosion-resistant stainless-steel fasteners DIN ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts DIN 7997:2016-12 5 3 Dimensions See Figure 1 and Tab
12、le 1. Symbols and their descriptions are specified in DIN EN ISO 225. b 0,6 l a) Longitudinal view b) Head view, cross recess type H c) Head view, cross recess type Z a Edge radiused or flat Figure 1 Dimensions of cross recessed countersunk head wood screw (notation) DIN 7997:2016-12 6 Table 1 Dimen
13、sions Dimensions in millimetres Thread size (2) 2,5 3 3,5 4 4,5 5 (5,5) 6 (7) (8) dsmax. 2,00 2,50 3,00 3,50 4,00 4,50 5,00 5,50 6,00 7,00 8,00 min. 1,60 2,10 2,60 3,02 3,52 4,02 4,52 5,02 5,52 6,42 7,42 dkNominal size 3,8 4,7 5,6 6,5 7,5 8,3 9,2 10,2 11,0 12,5 14,5 max. 4,18 5,08 5,98 6,95 7,95 8,7
14、5 9,65 10,75 11,55 13,05 15,05 min. 3,42 4,32 5,22 6,05 7,05 7,85 8,75 9,65 10,45 11,95 13,95 k max. 1,20 1,50 1,65 1,93 2,20 2,35 2,50 2,75 3,00 3,50 4,00 Cross recess No. 0 1 2 3 4 Cross recess Type H m 2,7 2,9 3,9 4,4 4,6 4,8 6,2 6,6 6,8 8,7 Pene-tration depth min. 1,25 1,50 1,40 1,90 2,10 2,29 2
15、31 2,80 2,95 3,90 max. 1,55 1,80 1,90 2,40 2,60 2,79 2,81 3,30 3,53 4,40 Type Z m 2,8 3,0 4,0 4,2 4,4 5,0 6,1 6,3 7,0 8,5 Pene-tration depth min. 1,48 1,76 1,60 1,85 2,05 2,64 2,46 2,72 3,38 3,86 max. 1,73 2,01 2,06 2,31 2,51 3,10 2,92 3,18 3,84 4,32 l Nominal size min. max. 10 9,25 10,75 12 11,10
16、12,90 (14) 13,10 14,90 16 15,10 16,90 (18) 17,10 18,90 20 19,00 21,00 25 24,00 26,00 30 29,00 31,00 35 33,75 36,25 40 38,75 41,25 45 43,75 46,25 50 48,75 51,25 60 58,50 61,50 70 68,50 71,50 80 78,50 81,50 Lengths exceeding 80 mm shall be graded in 10 mm increments. Bracketed sizes should be avoided
17、if possible. NOTE Commercial sizes of wood screws are those given in the zone between the stepped lines. DIN 7997:2016-12 7 4 Technical delivery conditions See Table 2. Table 2 Technical delivery conditions and reference standards Material Steel Stainless steel Nonferrous metal St (grade at the manu
18、facturers discretion) A2 to A5aCuZn = copper-zinc-alloydGeneral requirements DIN ISO 8992 Threads and thread ends DIN 7998 Drive Cross recess as in DIN EN ISO 4757 Limit deviations, geometrical tolerances Product grade C Standard DIN EN ISO 4759-1bSurface finish Coating As processed. DIN EN ISO 4042
19、 applies with regard to electroplating. PlaincAs processed. DIN EN ISO 4042 applies with regard to electroplating. Surface condition DIN EN 26157-1 applies with regard to limits for surface discontinuities. Acceptance inspection DIN EN ISO 3269 aThe material designation of screws complying with this
20、 standard shall be analogous to that given in DIN EN ISO 3506-4. bDIN EN ISO 4759-1 currently applies only for screws with ISO metric screw thread and for tapping screws. Unless given in this standard, the permissible deviations and geometrical tolerances specified in DIN EN ISO 4759-1 shall be adop
21、ted analogously for wood screws. cPassivation as in DIN EN ISO 16048 is recommended. dThe material designation of screws complying with this standard shall be analogous to that given in DIN EN 12166. 5 Designation Designation of a size 4 cross recessed countersunk head wood screw with a length l (nominal size) = 20 mm, made of steel (St), with type H cross recess: Wood screw DIN 7997 4 null 20 St H DIN 7997:2016-12 8 Bibliography DIN 4000-160, Tabular layout of product properties Part 160: Fasteners with external thread
