1、April 2013 Translation by DIN-Sprachendienst.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 2
2、1.040.10!%TM“2024942www.din.deDDIN 78Protrusions of bolt ends,English translation of DIN 78:2013-04Schraubenberstnde,Englische bersetzung von DIN 78:2013-04Dpassements des vis,Traduction anglaise de DIN 78:2013-04SupersedesDIN 78:2001-03www.beuth.deDocument comprises 6 pagesIn case of doubt, the Ger
3、man-language original shall be considered authoritative.07.13 DIN 78:2013-04 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Bolt end protrusions 4 3.1 Metric screws 4 3.2 Tapping screws . 6 DIN 78:2013-04 3 Foreword This standard has been
4、 prepared by Working Committee NA 067-00-01 AA Referenznormen und Qualittsmanagement of the Normenausschuss Mechanische Verbindungselemente (FMV) (Fasteners Standards Committee). Attention is drawn to the possibility that some elements of this document may be the subject of patent rights. DIN shall
5、not be held responsible for identifying any or all such patent rights. Amendments The standard differs from DIN 78:2001-03 as follows: a) bolt end protrusions for tapping screws have been included; b) the illustration of bolt end protrusions for metric screws has been revised and studs are no longer
6、 included. Previous editions DIN 78-1: 1921-10, 1925-02, 1929-07, 1965-09 DIN 78-2: 1923-02, 1925-02, 1929-07 DIN 78: 1929-07, 1953-08, 1975-09, 1983-12, 2001-03 DIN 78:2013-04 4 1 Scope This standard specifies minimum bolt end protrusions for general purpose assemblies of bolts, screws and similar
7、fasteners with ISO metric screw thread in accordance with DIN 13-28, and with tapping screw thread in accordance with DIN EN ISO 1478. The bolt end protrusions specified here shall ensure the full load bearing capacity and functioning of the nut (internal thread). The bolt end protrusions specified
8、in this standard do not apply where different bolt end protrusion standards have been specified in specific application or product standards. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. Fo
9、r dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 13-28, ISO metric screw threads Coarse and fine screw threads from 1 to 250 mm screw thread diameter Root cross-sections, tensile stress c
10、ross-sections and pitch angles DIN EN ISO 1478, Tapping screw thread DIN EN ISO 4753, Fasteners Ends of parts with external ISO metric thread 3 Bolt end protrusions 3.1 Metric screws The following applies: for bolts with hexagon nuts: The minimum bolt end protrusion lP minshall be twice the thread p
11、itch P plus the length of the bolt end protrusion according to DIN EN ISO 4753 that exceeds dimension u (as shown in Figures 1, 3 and 5). for bolts assembled with self-locking hexagon nuts: The minimum bolt end protrusion lP minshall be three times the thread pitch P plus the length of the bolt end
12、protrusion according to DIN EN ISO 4753 that exceeds dimension u (as shown in Figures 2, 4 and 6). For thread pitch P DIN 13-28 applies. NOTE The nominal length of bolts, l, is calculated from the clamping length plus the total nut height and the minimum bolt end lP min. DIN 78:2013-04 5 EXAMPLES Fi
13、gure 1 Bolt end, type CH Figure 2 Bolt end, type CH, and self-locking hexagon nut Figure 3 Bolt end, type LD Figure 4 Bolt end, type LD, and self-locking hexagon nut Figure 5 Bolt end, type PC Figure 6 Bolt end, type PC, and self-locking hexagon nut DIN 78:2013-04 6 3.2 Tapping screws The minimum bolt end protrusion lP minshall be equal to 1,5 times the thread pitch P plus the length of the bolt end y according to DIN EN ISO 1478 (as shown in Figure 7). Figure 7 Bolt end, type R
