1、November 2014 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!%CS-“2324810www.din.de
2、DDIN 921Slotted pan head screws with large head,English translation of DIN 921:2014-11Flachkopfschrauben mit Schlitz und groem Kopf,Englische bersetzung von DIN 921:2014-11Vis tte cylindrique large, fendue,Traduction anglaise de DIN 921:2014-11SupersedesDIN 921:2007-01www.beuth.deDocument comprises
3、8 pages06.15Translation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.DIN 921:2014-11 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 conditions 8 5 Desi
4、gnation 8 DIN 921:2014-11 3 Foreword This document has been prepared by Working Committee NA 067-00-08 AA Verbindungselemente mit Sonderformen und aus Kunststoff of the DIN-Normenausschuss Mechanische Verbindungselemente (DIN Standards Committee Fasteners). The DIN 4000-160-2 tabular layout of produ
5、ct properties applies to slotted pan head 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 standard d
6、iffers from DIN 921:2007-01 as follows: a) normative references have been updated; b) symbol f as in DIN EN ISO 225 has been changed to v; c) in the first part of Table 1, the lines giving the maximum and minimum values for dimension t have been exchanged; d) the thread tolerance class for thread si
7、zes M1,4 has been changed; e) in Table 2, property class 4.8 has been restricted to thread sizes M1,6; f) in Table 2, the indication that no marking is required has been added; g) in Table 2, footnote a has been deleted and is now included in the table under “Mechanical properties”. Previous edition
8、s DIN 921: 1943-01, 1954-02, 1972-08, 1986-09, 2006-08, 2007-01 DIN 921:2014-11 4 1 Scope This standard specifies dimensions and technical delivery conditions for M1 to M10 slotted pan head screws with large head. 2 Normative references The following documents, in whole or in part, are normatively r
9、eferenced 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) applies. DIN 267-6, Fasteners Technical delivery conditions, finishes and toler
10、ances for product grade F DIN 962, Bolts, screws, studs and nuts Designation, 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
11、 rods DIN EN 10277-3, Bright steel products Technical delivery conditions 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 n
12、uts DIN EN ISO 225, Fasteners Bolts, screws, studs and nuts Symbols and descriptions 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
13、3269, Fasteners Acceptance inspection DIN EN ISO 3506-1, Mechanical properties 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
14、, 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 965-1, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data DIN ISO 8992, Fasteners Gener
15、al requirements for bolts, screws, studs and nuts DIN 921:2014-11 5 3 Dimensions See Figure 1 and Table 1. Symbols and their descriptions are given in DIN EN ISO 225. Key 1 End chamfered (CH) as in DIN EN ISO 4753 aLength of incomplete thread u 1,5 P. bTop edge of head rounded or chamfered (optional
16、). Figure 1 Dimensions of slotted pan head screw with large head (notation) DIN 921:2014-11 6 Table 1 Dimensions Dimensions in millimetres Thread size (d) M1 M1,2 M1,4 M1,6 M2 M2,5 Pa0,25 0,25 0,3 0,35 0,4 0,45 a max. 0,5 0,5 0,6 0,7 0,8 0,9 dkNominal size = max. 3,50 4,00 4,50 5,00 6,00 7,00 min. 3
17、,20 3,70 4,20 4,70 5,64 6,64 k Nominal size 0,70 0,80 0,90 1,00 1,20 1,50 max. 0,82 0,92 1,02 1,12 1,32 1,62 min. 0,58 0,68 0,78 0,88 1,08 1,38 n Nominal size 0,25 0,3 0,3 0,4 0,5 0,6 max. 0,45 0,50 0,50 0,60 0,70 0,80 min. 0,31 0,36 0,36 0,46 0,56 0,66 r max. 0,10 0,10 0,10 0,10 0,10 0,10 t max. 0,
18、50 0,55 0,60 0,70 0,80 0,95 min. 0,35 0,40 0,45 0,50 0,60 0,75 v 0,20 0,20 0,25 0,25 0,30 0,40 l Nominal size min. max. 1,5 1,4 1,6 2 1,9 2,1 3 2,9 3,1 4 3,8 4,2 5 4,8 5,2 6 5,8 6,2 DIN 921:2014-11 7 Table 1 (continued) Dimensions in millimetres Thread size (d) M3 M4 M5 M6 M8 M10 Pa0,5 0,7 0,8 1 1,2
19、5 1,5 a max. 1,0 1,4 1,6 2,0 2,5 3,0 dkNominal size = max. 8,00 12,00 16,00 20,00 25,00 30,00 min. 7,64 11,57 15,57 19,48 24,48 29,48 k Nominal size 1,8 2,4 2,7 3,1 3,8 4,6 max. 1,92 2,52 2,82 3,25 3,95 4,75 min. 1,68 2,28 2,58 2,95 3,65 4,45 n Nominal size 0,8 1 1,2 1,6 2 2,5 max. 1,00 1,20 1,51 1,
20、91 2,31 2,81 min. 0,86 1,06 1,26 1,66 2,06 2,56 r max. 0,10 0,20 0,20 0,25 0,40 0,40 t max. 1,15 1,50 1,60 1,90 2,40 2,80 min. 0,90 1,20 1,30 1,50 1,90 2,30 v 0,45 0,60 0,70 0,80 0,90 1,10 l Nominal size min. max. 4 3,8 4,2 5 4,8 5,2 6 5,8 6,2 8 7,8 8,2 10 9,8 10,2 12 11,7 12,3 (14) 13,7 14,3 16 15,
21、7 16,3 (18) 17,7 18,3 20 19,7 20,3 Lengths exceeding 20 mm shall be graded in increments of 5 mm. The range of commercially available lengths is between the stepped continuous lines. Bracketed sizes should be avoided if possible. aP = Thread pitch DIN 921:2014-11 8 4 Technical delivery conditions Se
22、e Table 2. Table 2 Technical delivery conditions and referenced standards Material Steel Stainless steel Nonferrous metal General requirements DIN ISO 8992 Threads Tolerance class M1,4: 4h M1,4: 6g Standard DIN ISO 965-1 Mechanical properties Property class (material) d M1,6: to be agreed M1,6 d M10
23、: 4.8 A1-50 A2-70 CU2 CU3 Standards d M1,6: DIN EN 10087 DIN EN 10277-3 M1,6 d M10: DIN EN ISO 898-1 DIN EN ISO 3506-1 DIN EN 28839 Marking None None None Limit deviations, geometrical tolerances Product grade M1,4: F M1,6: A Standards DIN 267-6, DIN EN ISO 4759-1 Surface finish Coating As processed
24、. Passivation as in DIN EN ISO 16048 Plain DIN EN ISO 4042 applies with regard to electroplating. DIN EN ISO 4042 applies with regard to electroplating. Surface discontinuities DIN EN 26157-1 applies to tolerances for surface discontinuities. Acceptance inspection DIN EN ISO 3269 applies with regard
25、 to acceptance inspection. 5 Designation EXAMPLE Designation of a slotted pan head screw with large head of thread size d = M5, with a length l (nominal size) = 10 mm, assigned to property class 4.8: Pan head screw DIN 921 M5 10 4.8 Designation details for special design features are given in DIN 962.
