DIN 7513-2016 Thread cutting screws - Hexagon screws and slotted head screws - Dimensions requirements testing《螺纹切削螺钉 六角头螺钉和槽头螺钉 尺寸、要求、检验》.pdf

1、December 2016 English price group 8No 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!%dR“2655947www.din.deD

2、IN 7513Thread cutting screws Hexagon screws and slotted head screws Dimensions, requirements, testing,English translation of DIN 7513:2016-12Gewinde-Schneidschrauben Sechskantschrauben, Schlitzschrauben Mae, Anforderungen, Prfungen,Englische bersetzung von DIN 7513:2016-12Vis auto-taraudeuses Vis tt

3、e hexagonale, vis tte fendue Dimensions, exigences, essai,Traduction anglaise de DIN 7513:2016-12SupersedesDIN 7513:1995-09www.beuth.deDocument comprises 12 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.05.17 DIN 7513:2016-12

4、 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope 4 2 Normative references 4 3 Dimensions and designation . 5 4 Requirements 7 4.1 General requirements 7 4.2 Design and dimensional accuracy . 7 4.3 Material . 7 4.4 Thread . 7 4.5 Surface finish . 7 4.6 Metallurgical proper

5、ties . 7 4.6.1 Surface hardness 7 4.6.2 Case depth 7 4.6.3 Core hardness . 8 4.6.4 Microstructure 8 4.7 Mechanical properties . 8 4.7.1 Thread cutting capability . 8 4.7.2 Torsional strength . 8 4.7.3 Tensile strength . 8 5 Testing . 8 5.1 Testing of metallurgical properties 8 5.1.1 Determination of

6、 surface hardness 8 5.1.2 Determination of case depth . 9 5.1.3 Determination of core hardness 9 5.1.4 Examination of microstructure 9 5.2 Testing of mechanical properties 9 5.2.1 Drive test . 9 5.2.2 Torsional strength test 10 5.2.3 Tensile test . 11 Bibliography . 12 DIN 7513:2016-12 3 Foreword Th

7、is 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 4000-160-11 tabular layouts of product properties apply to screws covered in this standa

8、rd. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights without these having been identified here. DIN and/or DKE shall not be held responsible for identifying any or all such patent rights. Amendments This standard differs from DIN 75

9、13:1995-09 as follows: a) normative references have been updated; b) table headings have been rendered more precise; c) a Bibliography has been added; d) the standard has been editorially revised. Previous editions DIN 7513: 1943x-08, 1956-05, 1968-03, 1971-08, 1986-11, 1995-09 DIN 7513:2016-12 4 1

10、Scope This standard applies to heat treated thread cutting screws (hexagon head and slotted head thread cutting screws) with an ISO metric thread as specified in DIN ISO 261, with cutting flutes extending from the point of the screw to its head, and designed to cut their mating thread during assembl

11、y. For head styles of the screws, see the relevant DIN Standards in Clause 3. See DIN ISO 8992 for general requirements and DIN EN ISO 3269 for acceptance inspection. The specifications of this standard are intended to ensure that, provided they are not overstressed, thread cutting screws are capabl

12、e of performing the above functions without their own thread fracturing or becoming deformed. To that end, requirements for assessing mechanical and functional characteristics of thread cutting screws have been specified for: surface hardness; minimum torque; minimum ultimate tensile; thread cutting

13、 capability. 2 Normative 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 (includ

14、ing any amendments) applies. DIN EN 10083-2, Steels for quenching and tempering Part 2: Technical delivery conditions for non alloy steels DIN EN 10084, Bright steel products Technical delivery conditions DIN EN 10263-3, Steel rod, bars and wire for cold heading and cold extrusion Part 3: Technical

15、delivery conditions for case hardening steels DIN EN 10263-4, Steel rod, bars and wire for cold heading and cold extrusion Part 4: Technical delivery conditions for steels for quenching and tempering DIN EN ISO 1207, Slotted cheese head screws Product grade A DIN EN ISO 2009, Slotted countersunk fla

16、t head screws Product grade A DIN EN ISO 2010, Slotted raised countersunk head screws Product grade A DIN EN ISO 2639, Steels Determination and verification of the depth of carburized and hardened cases DIN EN ISO 3269, Fasteners Acceptance inspection DIN EN ISO 4017, Fasteners Hexagon head screws P

17、roduct grades A and B DIN EN ISO 4042, Fasteners Electroplated coatings DIN 7513:2016-12 5 DIN EN ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C DIN EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method DIN EN ISO 6507-4, Me

18、tallic materials Vickers hardness test Part 4: Tables of hardness values DIN ISO 261, ISO general purpose metric screw threads General plan DIN ISO 965-1, ISO general purpose metric screw threads Tolerances Part 1: Principles and basic data DIN ISO 8992, Fasteners General requirements for bolts, scr

19、ews, studs and nuts 3 Dimensions and designation Dimensions see Table 1, Table 2 and Figure 1. Table 1 Types and designations Type Figure Other dimensions as in Example of designation A DIN EN ISO 4017 Thread cutting screw DIN 7513 A M5 null 20 St BE DIN EN ISO 1207 Thread cutting screw DIN 7513 BE

20、M5 null 20 St FE DIN EN ISO 2009 Thread cutting screw DIN 7513 FE M5 null 20 St GE DIN EN ISO 2010 Thread cutting screw DIN 7513 GE M5 null 20 St DIN 7513:2016-12 6 The edge of the core hole on the insertion side shall be sharp-edged. a) Thread end b) Core hole Figure 1 Dimensions (notation) Table 2

21、 Range of commercial sizes and core hole diameters Dimensions in millimetres Type BE, FE and GE A, BE, FE and GE Thread size, d M2,5 M3 M4 M5 M6 M8 Nominal length, laRange of commercial sizesb6 c c 8 c 10 c 12 c (14) 16 (18) 20 (22) 25 30 35 40 Core hole diameterddhH11 2,2 2,7 3,6 4,5 5,5 7,4 aBrack

22、eted sizes should be avoided if possible. bThe zone between the continuous thick lines indicates the commercial sizes. These screws only are covered by this standard. cNot for types FE and GE. dDesigned for workpieces made from materials of medium strength. For thin-walled workpieces or workpieces m

23、ade from soft materials, a smaller core hole diameter, and for thick-walled workpieces or workpieces made from hard materials, a larger core hole diameter may be chosen. It is recommended that the selection be made on the basis of tests. The depth of engagement should not exceed 2d. DIN 7513:2016-12

24、 7 4 Requirements 4.1 General requirements For general requirements, DIN ISO 8992 shall apply. 4.2 Design and dimensional accuracy The design and dimensional accuracy of thread cutting screws shall comply with DIN EN ISO 4759-1, product grade A, unless otherwise specified in the relevant dimensional

25、 standards. 4.3 Material Thread cutting screws may be made of case hardening steel as specified in DIN EN 10084 or quenched and tempered steel as specified in DIN EN 10083-2 (symbol St) at the manufacturers discretion. For steels for screws, see DIN EN 10263-3 and DIN EN 10263-4. The use of other ma

26、terials shall be subject to agreement. 4.4 Thread The thread of thread cutting screws shall be such that the thread formed is capable of accommodating a screw with ISO metric screw thread complying with DIN ISO 965-1 and produced to tolerance 6h. The form of thread and thread tolerance for the screw

27、s shall be at the manufacturers discretion. 4.5 Surface finish DIN EN ISO 4042 applies with regard to electroplating. Other surface finishes shall be subject to agreement. 4.6 Metallurgical properties 4.6.1 Surface hardness The surface hardness of thread cutting screws shall, after heat treatment, b

28、e at least 450 HV 0,3. 4.6.2 Case depth The case depth of screws shall comply with the values specified in Table 3. DIN 7513:2016-12 8 Table 3 Case depth Dimensions in millimetres Thread size, d Case depth Eht 450 min. max. M2,5 0,04 0,12 M3 0,05 0,18 M4 and M5 0,10 0,25 M6 and M8 0,15 0,28 4.6.3 Co

29、re hardness The core hardness of thread cutting screws shall, after heat treatment, be between 240 HV 5 and 370 HV 5. 4.6.4 Microstructure The microstructure of thread cutting screws shall, after heat treatment, show no band of free ferrite between core and case. 4.7 Mechanical properties 4.7.1 Thre

30、ad cutting capability Thread cutting screws shall be capable of cutting a mating thread when driven into a test plate as specified in 5.2.1, without their own thread becoming deformed. 4.7.2 Torsional strength The torsional strength of thread cutting screws shall be such that, when tested in accorda

31、nce with 5.2.2, the torque necessary to cause failure (breaking torque) is equal to or greater than the minimum values specified in Table 5. 4.7.3 Tensile strength The tensile strength of thread cutting screws shall be such that, when tested in accordance with 5.2.3, the torque necessary to cause fa

32、ilure (breaking torque) is equal to or greater than the minimum values specified in Table 6. 5 Testing 5.1 Testing of metallurgical properties 5.1.1 Determination of surface hardness Vickers surface hardness testing shall be carried out according to DIN EN ISO 6507-1 and DIN EN ISO 6507-4. The impre

33、ssion shall be made on a flat section of the screw, preferably on the screw head. DIN 7513:2016-12 9 5.1.2 Determination of case depth The case depth can be determined by examining a microsection made at the thread flank mid-point (i.e. between crest and root) with a microscope. The determination of

34、 the case depth is specified in DIN EN ISO 2639. 5.1.3 Determination of core hardness Vickers core hardness testing shall be carried out according to DIN EN ISO 6507-1 and DIN EN ISO 6507-4. 5.1.4 Examination of microstructure The microstructure of the screw material shall be examined metallographic

35、ally. 5.2 Testing of mechanical properties 5.2.1 Drive test The screw to be tested shall be driven into a test plate until one full-form thread projects above the surface of the other side of the plate. The thickness of the test plate shall be as specified in Table 4. Table 4 Test plate details and

36、cutting torques Thread size, d Plate thickness Hole diameter of plate Cutting torque mm mm Tolerance zone H9 Nm max. M2,5 2,5 2,2 0,6 M3 3 2,7 0,9 M4 4 3,6 2,1 M5 5 4,5 4,2 M6 6 5,5 7,2 M8 8 7,4 17 The Brinell hardness of the test material shall be between 110 HB and 130 HB. The test plate material

37、shall have a carbon content not exceeding 0,23 %. The core hole in the test plate can be produced by drilling, punching and redrilling, or by reaming or piercing. The force used to drive the screw into the test plate shall not exceed 50 N for sizes up to M5, and 100 N for size M6 or more. The drivin

38、g speed shall not exceed 30 revolutions per minute. The cutting torque shall not exceed the values given in Table 4. Where necessary, the lubricant to be used during the drive test shall be agreed upon. DIN 7513:2016-12 10 NOTE If thread cutting screws are plated by the purchaser, any complaints mad

39、e to the screw manufacturer need be accepted only if driving tests carried out on screws of the same consignment not subsequently plated do not provide satisfactory results. 5.2.2 Torsional strength test The shank of the screw to be tested shall be clamped in a split threaded die with mating thread

40、or in an equivalent device so that the clamped portion of the screw is not damaged. At least two full-form threads shall project above the clamping device, and at least two full-form threads (without screw end) shall be held in the clamping device. In the case of short screws, the complete thread sh

41、all be held in the die, the screw head not resting on the device. The screw shall be tightened until fracture occurs, and the minimum breaking torques shall be established (see Table 5). Figure 2 shows an example of an appropriate test device. Key 1 Split threaded die 2 Blind hole Figure 2 Test devi

42、ce DIN 7513:2016-12 11 Table 5 Minimum breaking torques Thread size, d Minimum breaking torque Nm M2,5 1 M3 1,5 M4 3,4 M5 7,1 M6 12 M8 28 5.2.3 Tensile test The screw (to be tested as a finished component) shall be clamped in a tensile testing machine and subjected to tensile stress. Minimum breakin

43、g torques shall be established as specified in Table 6 until a fracture of the screw occurs. Table 6 Minimum breaking forces Thread size, d Minimum breaking force N M2,5 2 700 M3 4 000 M4 7 000 M5 11 400 M6 16 000 M8 29 000 DIN 7513:2016-12 12 Bibliography DIN 4000-160, Tabular layout of product properties Part 160: Fasteners with external thread