1、May 2008DEUTSCHE NORM English price group 5No 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!$QMY“1464254ww
2、w.din.deDDIN 968Cross recessed pan head tapping screws with collarLinsenkopf-Blechschrauben mit Bund und KreuzschlitzSupersedesDIN 968:2002-12www.beuth.deIn case of doubt, the German-language original should be consulted as the authoritative text.Translation by DIN-Sprachendienst.Document comprises
3、7 pagesDIN 968:2008-05 2 Foreword This standard has been prepared by the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee), Technical Committee NA 067-03-03 AA Kleinschrauben. The DIN 4000-160-9 tabular layout of article characteristics shall apply to screws covered in
4、this standard. Amendments This standard differs from DIN 968:2002-12 as follows: a) Pan head tapping screws may now also be made of grade A5-20H stainless steel. Previous editions DIN 968: 1994-01, 2002-12 DIN 968:2008-05 3 1 Scope This standard specifies dimensions and technical delivery conditions
5、 for sizes ST2,9 to ST6,3 cross re-cessed pan head tapping screws with collar, of product grade A. See DIN 962 for special screw types and finishes. 2 Normative references The following reference documents are indispensable for the application of this document. For dated refer-ences, only the editio
6、n cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 962, Designation system for fasteners DIN EN ISO 1478, Tapping screw threads DIN EN ISO 2702, Heat-treated steel tapping screws Mechanical properties DIN EN ISO 3269, Fasten
7、ers Acceptance inspection DIN EN ISO 3506-4, Mechanical properties of corrosion-resistant stainless steel fasteners Part 4: Tap-ping screws DIN EN ISO 4042, Fasteners Electroplated coatings DIN EN ISO 4757, Cross recesses for screws DIN EN ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws,
8、studs and nuts Product grades A, B and C DIN EN ISO 10683, Fasteners Non-electrolytically applied zinc flake coatings DIN 968:2008-05 4 3 Dimensions Screw dimensions shall be as given in Figure 1 and Table 1. Figure 1 Dimensions of cross recessed pan head tapping screws with collar (notation) DIN 96
9、8:2008-05 5 Table 1 Screw dimensions Dimensions in millimetres ThreadaST2,9 ST3,5 ST4,2 ST4,8 (ST5,5) ST6,3 Pa1,1 1,3 1,4 1,6 1,8 1,8 abmax. 1,1 1,3 1,4 1,6 1,8 1,8 damax. 3,5 4,1 4,9 5,6 6,3 7,3 Nominal size max. 7,5 9,0 10,0 11,5 13,0 14,5 dkmin. 6,92 8,42 9,42 10,8 12,3 13,8 Nominal size max. 2,3
10、5 2,6 3,05 3,55 3,8 4,55 k min. 2,10 2,35 2,75 3,25 3,5 4,25 max. 0,8 0,9 1,1 1,35 1,6 1,8 c min. 0,6 0,7 0,9 1,05 1,2 1,4 r min. 0,1 0,1 0,2 0,2 0,25 0,25 rf 3,8 4,6 5,8 6,6 7,8 8,2 Cross recess no. 1 2 3 m reference dimension 3,0 4,2 4,6 5,0 6,5 7,1 min. 1,35 1,4 1,8 2,26 2,49 3,0 Type H Depth max
11、. 1,8 2,03 2,46 2,87 3,15 3,66 m reference dimension 2,9 3,9 4,3 4,7 6,2 6,7 min. 1,58 1,47 1,88 2,28 2,51 3,02 Cross recess Type Z Depth max. 1,83 1,93 2,34 2,74 2,97 3,48 Type C 2,6 3,2 3,7 4,3 5 6 Type F 2,1 2,5 2,8 3,2 3,6 3,6 ycReference dimension Type R 2,7 3,2 3,6 4,3 5,0 ldTypes C and R Type
12、 F Mass ( = 7,85 kg/dm3) in kg/1 000 units Nominal size min. max. min. max. 4,5 3,7 5,3 3,7 4,5 6,5 5,7 7,3 5,7 6,5 0,602 9,5 8,7 10,3 8,7 9,5 0,710 1,04 1,55 2,28 13 12,2 13,8 12,2 13 0,836 1,22 1,79 2,61 3,77 4,90 16 15,2 16,8 15,2 16 0,944 1,37 2,00 2,89 4,15 5,44 19 18,2 19,8 18,2 19 1,05 1,52 2
13、,21 3,17 4,53 5,98 22 21,2 22,8 20,7 22 1,67 2,42 3,45 4,91 6,52 25 24,2 25,8 23,7 25 1,83 2,63 3,73 5,29 7,06 32 30,7 33,3 30,7 32 3,12 4,39 6,20 8,32 38 36,7 39,3 36,7 38 4,95 6,98 9,40 45 43,7 46,3 43,5 45 50 48,7 51,3 48,5 50 NOTE The range of commercially available lengths is between the steppe
14、d lines. aP = pitch of thread. bDistance between last fully formed thread and bearing face. cLength of incomplete thread as in DIN EN ISO 1478. dSizes identified by a dash () are not available. DIN 968:2008-05 6 4 Technical delivery conditions Table 2 Technical delivery conditions Material Steel Sta
15、inless steel Screw thread and thread end Standard DIN EN ISO 1478 Hardness class (material) St A2-20H, A4-20H, A5-20H Mechanical properties Standards DIN EN ISO 2702 DIN EN ISO 3506-4 Product grade A Limit deviations and geometrical tolerances Standard DIN EN ISO 4759-1 Cross recess DIN EN ISO 4757
16、As processed Surface finish DIN EN ISO 4042 shall apply with regard to electroplating. DIN EN ISO 10683 shall apply with regard to non-electrolytically applied zinc flake coat-ings. Acceptance inspection DIN EN ISO 3269 shall apply with regard to acceptance inspection. 5 Designation Designation of a
17、n ST3,5 pan head tapping screw with collar (ST3,5), made of steel (St), with type R thread end (R) and type Z cross recess (Z), and with a nominal length l = 16 mm: Tapping screw DIN 968 ST3,5 16 St R Z Designation of an ST3,5 pan head tapping screw with collar (ST3,5), made of grade A2 stainless steel of hardness class 20 (A2-20H), with type R thread end (R) and type Z cross recess (Z), and with a nominal length l = 16 mm: Tapping screw DIN 968 ST3,5 16 A2-20H R Z DIN 968:2008-05 7 Bibliography DIN 4000-160, Tabular layout of product properties Part 160: Fasteners with external thread
