1、June 2009 Translation by DIN-Sprachendienst.English price group 10No 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、1.060.10!$i5f“1701867www.din.deDDIN 7500-1Thread rolling screws for ISO metric thread Part 1: Technical delivery conditions for case hardened and temperedscrewsEnglish translation of DIN 7500-1:2009-06Gewindefurchende Schrauben fr Metrisches ISO-Gewinde Teil 1: Technische Lieferbedingungen fr einsat
3、zgehrtete und angelassene SchraubenEnglische bersetzung von DIN 7500-1:2009-06Vis taraudeuses par roulage pour filetages mtriques ISO Partie 1: Spcification techniques pour vis autotaraudeuses par dformation, filetagemtrique cmentes et revenuesTraduction anglaise de DIN 7500-1:2009-06SupersedesDIN 7
4、500-1:2007-03,DIN EN ISO 7085:2000-01 andwithdrawn 2008-06www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1509.10sDIN 7500-1:2009-06 A comma is used as the decimal marker. Contents Page Foreword. 4 1 Scope . 5 2 Normative reference
5、s . 5 3 Terms and definitions 6 4 Requirements 6 4.1 General requirements. 6 4.2 Design and dimensional accuracy 6 4.3 Materials 6 4.4 Mechanical properties 6 4.4.1 Overview 6 4.4.2 Heat treatment. 7 4.4.3 Hardness 7 4.4.4 Case depth. 8 4.4.5 Breaking torque 8 4.4.6 Ductility 8 4.4.7 Ability to form
6、 a mating thread 8 4.4.8 Lubrication of thread rolling screws. 9 4.4.9 Embrittlement 9 4.4.10 Core hardness after retempering 9 5 Test method. 9 5.1 Core hardness test . 9 5.2 Case hardness test. 10 5.3 Case depth test . 10 5.4 Torsional test 10 5.5 Ductility test 10 5.6 Driveability test . 11 5.6.1
7、 Thread rolling capability 11 5.6.2 Test plate . 12 5.7 Embrittlement test 12 5.8 Retempering test. 12 6 Torque meter. 12 7 Acceptance inspection. 12 8 Marking 12 8.1 Symbol . 12 8.2 Identification 13 8.3 Manufacturers identification mark. 13 9 Types and designation. 13 Bibliography . 15 Figures Fig
8、ure 1 Length of the thread rolling section 9 Figure 2 Points at which the case hardness may be measured. 10 Figure 3 Points at which the case depth may be measured. 10 Figure 4 Ductility test. 11 2 DIN 7500-1:2009-06 Page Tables Table 1 Chemical composition .6 Table 2 Mechanical properties .7 Table
9、3 Mechanical and performance requirements7 Table 4 Case depth 8 Table 5 Test plate thickness and hole diameter .12 Table 6 Screw types and designations13 3 DIN 7500-1:2009-06 Foreword This standard has been prepared by Working Committee NA 067-02-05 AA Mechanische Eigenschaften fr gewindeformende Sc
10、hrauben of the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee). In October 2007, CEN withdrew the European Standard EN ISO 7085 by resolution BT C67/2007 due to technical irregularities. This applies in particular to provisions regarding the breaking torque in relatio
11、n to hardness which did not adequately reflect the current state of the art. This standard replaces DIN EN ISO 7085, which was withdrawn in June 2008, and now contains values of breaking torque and screw-in torque that reflect the current state of the art. Amendments This standard differs from DIN E
12、N ISO 7085:2000-01 and DIN 7500-1:2007-03 as follows: a) the content of both standards has been merged; b) information regarding design and dimensional accuracy has been included in 4.2; c) the torque values in Table 3 have been reduced corresponding to the requirements for hardness; d) the values o
13、f the case hardening depth in Table 4 have been revised; e) the determination of the case hardening depth in 4.4.4 has been revised; f) a warning notice regarding the use of bolts and screws subjected to different heat treatment procedures has been included in 4.4.5; g) the provisions regarding the
14、forming of the mating thread have been revised; h) all details regarding tensile force and tensile strength testing have been deleted; i) details regarding the maximum thread rolling section have been deleted; j) the hole diameters in Table 5 have been changed; k) in 5.6.2, the hardness of the test
15、plate has been changed. Previous editions DIN 7500: 1978-10 DIN 7500-1: 1984-12, 1995-08, 2007-03 DIN EN ISO 7085: 2000-01 4 DIN 7500-1:2009-06 1 Scope This standard specifies requirements for case hardened and tempered metric thread rolling screws with various forms of head geometry designed to pro
16、duce internal threads with nominal diameters from 2 mm to 12 mm, which fit general purpose ISO metric screw threads and are used in general engineering applications. NOTE Guideline values for hole diameters of thread rolling screws are given in DIN 7500-2. This standard does not apply to thread cutt
17、ing screws. DIN EN ISO 898-1 is not applicable to screws made according to this standard. 2 Normative references The following references are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the re
18、ferenced document (including any amendments) applies. DIN 962 Bolts, screws, studs and nuts Designation, types and finishes DIN EN 20898-7, Mechanical properties of fasteners Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm DIN EN ISO 2639, Steels
19、Determination and verification of the depth of carburized and hardened cases DIN EN ISO 3269, Fasteners Acceptance inspection DIN EN ISO 4017, Hexagon head screws Product grades A and B DIN EN ISO 4042, Fasteners Electroplated coatings DIN EN ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screw
20、s, studs and nuts Product grades A, B and C DIN EN ISO 4762, Hexagon socket head cap screws DIN EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method DIN EN ISO 7045, Pan head screws with type H or type Z cross recess Product grade A DIN EN ISO 7047, Pan countersunk raised head
21、 screws (common head style) with type H or type Z cross recess Product grade A DIN EN ISO 14579, Hexalobular socket head cap screws DIN EN ISO 14583, Hexalobular socket pan head screws DIN EN ISO 14584, Hexalobular socket raised countersunk head screws DIN EN ISO 15330, Fasteners Preloading test for
22、 the detection of hydrogen embrittlement Parallel bearing surface method DIN ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts ISO 5954 Cold-reduced carbon steel sheet according to hardness requirements 5 DIN 7500-1:2009-06 3 Terms and definitions For the purposes of this do
23、cument, the following terms and definitions apply in order to categorize thread forming screws: 3.1 thread rolling screw screw with a specially configured thread end which, when screwed into a predrilled hole, forms a mating thread without removing material from that hole 3.2 thread cutting screw sc
24、rew which, when screwed into a predrilled hole, forms a mating thread by cutting, with chip removal. The screw may be notched at the tip to aid thread cutting 4 Requirements 4.1 General requirements For general requirements DIN ISO 8992 applies. 4.2 Design and dimensional accuracy For design and dim
25、ensional accuracy, DIN EN ISO 4759-1, product grade A applies, unless otherwise specified. 4.3 Materials Thread rolling screws shall be made of cold extruded steel. The chemical composition in Table 1 is given for guidance only. Table 1 Chemical composition Composition limits (percentage by mass) An
26、alysis Carbon Manganese Ladle 0,15 to 0,25 0,70 to 1,65 Check 0,13 to 0,27 0,64 to 1,71 NOTE Boron content can reach 0,00 5 %, provided that the non-effective boron is controlled by addition of titanium and/or aluminium. 4.4 Mechanical properties 4.4.1 Overview An overview of mechanical properties a
27、nd the clauses in which the respective tests are specified is given in Table 2. 6 DIN 7500-1:2009-06 Table 2 Mechanical properties Property Test reference Core hardness 5.1 Case hardness 5.2 Case depth 5.3 Breaking torque 5.4 Ductility 5.5 Driveability 5.6 Embrittlement 5.7 Core hardness after retem
28、pering 5.8 4.4.2 Heat treatment Finished screws shall be case hardened and tempered at a minimum tempering temperature of 340 C in order to meet the mechanical and performance requirements as detailed in Table 3. Table 3 Mechanical and performance requirements Nominal thread diameter mm Breaking tor
29、que min. Nm Screw-in torque max. Nm 2 0,4 0,3 2,5 1 0,6 3 1,8 1 3,5 2,8 1,6 4 4,1 2,4 5 8,7 4,7 6 15 8 8 37 20 10 75 39 12 133 70 4.4.3 Hardness 4.4.3.1 General The hardness test shall be carried out as specified in DIN EN ISO 6507-1. 4.4.3.2 Core hardness The core hardness shall be 290 HV10 to 370
30、HV10. The core hardness shall be between 290 HV5 and 370 HV5 when diameters d 5 mm In arbitration cases, the driving speed shall not exceed 30 min 1. The maximum torque measured during the test shall be regarded as the screw-in torque. In order to achieve the specified screw-in torque, lubrication m
31、ay be used. 11 DIN 7500-1:2009-06 5.6.2 Test plate The test plate shall be made of rolled steel with a low carbon content and a hardness of 110 HB (115 HV30) to 130 HB (135 HV30). The plate thickness shall be equal to the nominal thread diameter. The hole diameter shall be as specified in Table 5. T
32、able 5 Test plate thickness and hole diameter Dimensions in millimetresNominal thread diameter 2 2,5 3 3,5 4 5 6 8 10 12 Test plate thickness 2 2,5 3 3,5 4 5 6 8 10 12 max. 1,825 2,325 2,775 3,230 3,680 4,630 5,530 7,436 9,336 11,243Hole diameter min. 1,800 2,300 2,750 3,200 3,650 4,600 5,500 7,400
33、9,300 11,200NOTE Plate thickness tolerance as specified in ISO 5954 (for rolled plate). 5.7 Embrittlement test See DIN EN ISO 15330. 5.8 Retempering test The mean of three readings of core hardness of a thread rolling screw tested before and after retempering at a temperature of 330 C for one hour s
34、hall not differ by more than 20 HV. This test is not mandatory but shall be applied as a reference test in arbitration cases only. 6 Torque meter A torque meter shall be used for measuring the torques occurring during the torsional and driveability test. The torque meter to be used shall be a torque
35、 wrench or a mechanically driven testing instrument with a limit of error not exceeding 2 % of the upper limit of the given torque range (ultimate value of the measuring range). In arbitration cases, the device shall be chosen so that all values can be read off in the upper half of the measuring ran
36、ge. 7 Acceptance inspection For acceptance inspection, DIN EN ISO 3269 applies. 8 Marking 8.1 Symbol The marking symbol for case hardened and tempered thread rolling screws is “-O-”. 12 DIN 7500-1:2009-06 8.2 Identification Case hardened and tempered thread rolling screws shall be marked by indentin
37、g or embossing with the marking symbol defined in 8.1. Marking is obligatory for hexagon and hexalobular head screws with nominal thread diameters d 5 mm, preferably on the screw head. If agreed between the interested parties, the same marking shall be used for other types of case hardened and tempe
38、red metric thread rolling screws. 8.3 Manufacturers identification mark The manufacturers identification mark is mandatory on all products which are required to be marked with the marking symbol. 9 Types and designation Types and designations of thread rolling screws are given in Table 6. The type a
39、nd arrangement of the screw section used for thread rolling shall be at the manufacturers discretion. Table 6 Screw types and designations Type Illustration Other dimensions as in Range of sizes suitable for rolling Example of designationaCE DIN EN ISO 7045 M2 to M10 Screw DIN 7500 CE M6 20 ZbDE DIN
40、 EN ISO 4017 M2 to M12 Screw DIN 7500 DE M6 20 EE DIN EN ISO 4762 M2 to M12 Screw DIN 7500 EE M6 20 13 DIN 7500-1:2009-06 Table 6 (continued) Type Illustration Other dimensions as in Range of sizes suitable for rolling Example of designation aNE DIN EN ISO 7047 M2 to M10 Screw DIN 7500 NE M6 20 ZbOE
41、 DIN EN ISO 14579 M2 to M12 Screw DIN 7500 OE M6 20 PE DIN EN ISO 14583 M2 to M10 Screw DIN 7500 PE M6 20 QE DIN EN ISO 14584 M2 to M10 Screw DIN 7500 QE M6 20 l Nominal length ltfLength of thread rolling section P Pitch aIf screws with a shank are needed, according to DIN 962 the length of the thre
42、ad is to be given in the designation, e.g. Screw DIN 7500 OE M6 50 28.bIf designations do not include the symbol H or Z (to identify the cross recess), recess type H shall apply. 14 DIN 7500-1:2009-06 15 Bibliography DIN 7500-2, Thread rolling screws for ISO metric thread Guideline values for hole diameters DIN EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs DIN EN ISO 10683, Fasteners Non-electrolytically applied zinc flake coatings
