1、August 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 21.040.10!%iD“2703391www.din.deDIN
2、 76-1Thread run-outs and thread undercuts Part 1: For ISO metric threads in accordance with DIN 13-1,English translation of DIN 76-1:2016-08Gewindeauslufe und Gewindefreistiche Teil 1: Fr Metrisches ISO-Gewinde nach DIN 13-1,Englische bersetzung von DIN 76-1:2016-08Filets incomplets et dgagement par
3、 gorge Partie 1: Pour filetage mtrique ISO selon DIN 13-1,Traduction anglaise de DIN 76-1:2016-08SupersedesDIN 76-1:2004-06www.beuth.deDocument comprises 11 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.08.17 DIN 76-1:2016-08
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 . 4 3.1 External thread . 4 3.1.1 Thread run-out . 4 3.1.2 Distance from last full form thread to bearing face (for components threaded nearly up to the head) 4 3.1.3
5、Thread undercut 5 3.2 Internal thread (blind tapped hole) . 7 3.2.1 Blind tapped hole with thread run-out 7 3.2.2 Blind tapped hole with thread undercut . 8 Bibliography . 11 DIN 76-1:2016-08 3 Foreword This standard has been prepared by Working Committee NA 067-00-01 AA “Reference management and qu
6、ality management” of DIN-Normenausschuss Mechanische Verbindungselemente (DIN Standards Committee Fasteners). It largely conforms to the specifications of International Standard ISO 3508:1976 for thread run-outs on parts with external threads. It differs from International Standard ISO 4755:1983 for
7、 thread undercuts in the following manner. ISO 4755:1983 specifies a thread undercut with g2max= 3 P. Consensus in Germany holds that 3 P is not sufficient to produce threads that reach into the thread undercut using conventional tools. This standard therefore specifies a thread undercut with g2max=
8、 3,5 P for normal design, as previously. The short design with g2max= 2,5 P is intended for use in exceptional cases of technical limitation and requires the use of special tools. Contrary to DIN 76-1, International Standards ISO 3508:1976 and ISO 4755:1983 do not contain specifications for thread r
9、un-outs or thread undercuts for internal threads. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN and/or DKE shall not be held responsible for identifying some or all such patent rights. Amendments This standard differs from D
10、IN 76-1:2004-06 as follows: a) the standard has been editorially revised; b) normative references have been updated; c) the warning reference in 3.1.3 has been amended to include associated standards with relevant mechanical properties; d) the symbol for the nominal diameter of internal threads in F
11、igure 4 and Table 2 has been altered. Previous editions DIN 76-1: 1924-09, 1943-04, 1953-11, 1965-09, 1967-06, 1975-09, 1983-12, 2004-06 DIN 2352: 1924-11 DIN LON 369-1 = DIN 30140-1: 1936-12 DIN 76-1:2016-08 4 1 Scope This standard specifies dimensions for thread run-outs and thread undercuts for b
12、olts, screws and similar components with external or internal ISO metric (coarse or fine pitch) thread as in DIN 13-1 and DIN ISO 261, together with their standard designations. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are i
13、ndispensable 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 13-1, General purpose ISO metric screw threads Part 1: Nominal sizes for coarse pitch threads; nominal
14、 diameter from 1 mm to 68 mm DIN ISO 261, ISO general purpose metric screw threads General plan 3 Dimensions and designation 3.1 External thread 3.1.1 Thread run-out Examples of different types are given in Figure 1 and dimensions according to Table 1. Key 1 Shank diameter pitch diameter Figure 1 Th
15、read run-out dimensions (notation) 3.1.2 Distance from last full form thread to bearing face (for components threaded nearly up to the head) For dimensions see Figure 2 and Table 1. DIN 76-1:2016-08 5 Figure 2 Distance from last full form thread to bearing face (notation) 3.1.3 Thread undercut WARNI
16、NG Fasteners with thread undercut may not meet requirements for minimum breaking load or minimum breaking torque set out in the relevant standards with the associated mechanical properties. For dimensions see Figure 3 and Table 1. Type A with g1and g2of normal design Type B with g1and g2of short des
17、ign Figure 3 Thread undercut dimensions (notation) Designation of a type B thread undercut: Thread undercut DIN 76 B DIN 76-1:2016-08 6 Table 1 Dimensions of thread run-outs and thread undercuts for external threads Dimensions in millimetres Thread pitch Nominal diameter(s) (coarse thread) Thread ru
18、n-out Distance Thread undercut x1x2a1a2a3dgg1g2r max. max. min. max. Type A Type B Type A Type B P d NormalaShortbNormalcShortdLongeh13fNormalgShorthNormalgShorth0,2 0,5 0,25 0,6 0,4 d 0,3 0,45 0,25 0,7 0,5 0,1 0,25 1; 1,2 0,6 0,3 0,75 0,5 d 0,4 0,55 0,25 0,9 0,6 0,12 0,3 1,4 0,75 0,4 0,9 0,6 d 0,5
19、0,6 0,3 1,05 0,75 0,16 0,35 1,6; 1,7; 1,8 0,9 0,45 1,05 0,7 d 0,6 0,7 0,4 1,2 0,9 0,16 0,4 2; 2,3 1 0,5 1,2 0,8 d 0,7 0,8 0,5 1,4 1 0,2 0,45 2,2; 2,5; 2,6 1,1 0,6 1,35 0,9 d 0,7 1 0,5 1,6 1,1 0,2 0,5 3 1,25 0,7 1,5 1 d 0,8 1,1 0,5 1,75 1,25 0,2 0,6 3,5 1,5 0,75 1,8 1,2 d 1 1,2 0,6 2,1 1,5 0,4 0,7 4
20、1,75 0,9 2,1 1,4 d 1,1 1,5 0,8 2,45 1,75 0,4 0,75 4,5 1,9 1 2,25 1,5 d 1,2 1,6 0,9 2,6 1,9 0,4 0,8 5 2 1 2,4 1,6 3,2 d 1,3 1,7 0,9 2,8 2 0,4 1 6; 7 2,5 1,25 3 2 4 d 1,6 2,1 1,1 3,5 2,5 0,6 1,25 8 3,2 1,6 3,75 2,5 5 d 2 2,7 1,5 4,4 3,2 0,6 1,5 10 3,8 1,9 4,5 3 6 d 2,3 3,2 1,8 5,2 3,8 0,8 1,75 12 4,3
21、2,2 5,25 3,5 7 d 2,6 3,9 2,1 6,1 4,3 1 2 14; 16 5 2,5 6 4 8 d 3 4,5 2,5 7 5 1 2,5 18; 20; 22 6,3 3,2 7,5 5 10,0 d 3,6 5,6 3,2 8,7 6,3 1,2 3 24; 27 7,5 3,8 9 6 12 d 4,4 6,7 3,7 10,5 7,5 1,6 3,5 30; 33 9 4,5 10,5 7 14 d 5 7,7 4,7 12 9 1,6 4 36; 39 10 5 12 8 16 d 5,7 9 5 14 10 2 4,5 42; 45 11 5,5 13,5
22、9 18 d 6,4 10,5 5,5 16 11 2 5 48; 52 12,5 6,3 15 10 20 d 7 11,5 6,5 17,5 12,5 2,5 5,5 56; 60 14 7 16,5 11 22 d 7,7 12,5 7,5 19 14 3,2 6 64; 68 15 7,5 18 12 24 d 8,3 14 8 21 15 3,2 The dimensions specified are approximately equal to 2,5 P 1,25 P 3 P 2 P 4 P 3,5 P 2,5 P 0,5 P ax1to be used where no ot
23、her indications are made in product standards or in drawings. bx2only to be used where a short thread run-out is required for technical reasons. ca1to be used where no other indications are made in product standards or in drawings. da2to be used for slotted and cross recessed head screws and in case
24、s where a short distance is required for technical reasons. ea3only to be used for screws assigned to product grade C. fTolerance h12 for screw threads up to 3 mm nominal diameter. gType A to be used where no other indications are made in individual standards or in drawings. hType B only to be used
25、where a short thread undercut is required for technical reasons. Production of this thread undercut requires the use of special tools. DIN 76-1:2016-08 7 3.2 Internal thread (blind tapped hole) 3.2.1 Blind tapped hole with thread run-out For dimensions see Figure 4 and Table 2. Key b Useful thread l
26、ength a Limit deviation for the calculated value t: 0 +0,5b da, min= 1 D da, max= 1,05 D For nuts, the countersink diameters, da, are specified in the product (dimensional) standards. c Special designs (e.g. 90 or 60 countersink) shall be indicated on the diagram. A 60 countersink is recommended for
27、 studs with thread run-out and for centre holes, while a parallel countersink is recommended for light alloy studs. Figure 4 Dimensions of blind tapped holes with thread run-out (notation) DIN 76-1:2016-08 8 3.2.2 Blind tapped hole with thread undercut For dimensions see Figure 5 and Table 2. Type C
28、 with g1und g2of normal design Type D with g1und g2of short design Key b Useful thread length a Limit deviations for the calculated value t: 0 +0,5Other dimensions as in Figure 4. Figure 5 Dimensions of blind tapped holes with thread undercut (notation) Designation of a type C blind tapped hole with
29、 thread undercut: Blind tapped hole DIN 76 C DIN 76-1:2016-08 9 Table 2 Dimensions of thread run-outs and thread undercuts for internal threads Dimensions in millimetres Thread pitch Nominal diameter(s) (coarse thread) Thread run-out Thread undercut e1e2e3dgg1g2r max. min. max. Type C Type D Type C
30、Type D P D NormalaShortbLongch13 NormaldShorteNormaldShorte0,2 1,3 0,8 2 D + 0,1 0,8 0,5 1,2 0,9 0,1 0,25 1; 1,2 1,5 1 2,4 D + 0,1 1 0,6 1,4 1 0,12 0,3 1,4 1,8 1,2 2,9 D + 0,1 1,2 0,75 1,6 1,25 0,16 0,35 1,6; 1,7; 1,8 2,1 1,3 3,3 D + 0,2 1,4 0,9 1,9 1,4 0,16 0,4 2; 2,3 2,3 1,5 3,7 D + 0,2 1,6 1 2,2
31、1,6 0,2 0,45 2,2; 2,5; 2,6 2,6 1,6 4,1 D + 0,2 1,8 1,1 2,4 1,7 0,2 0,5 3 2,8 1,8 4,5 D + 0,3 2 1,25 2,7 2 0,2 0,6 3,5 3,4 2,1 5,4 D + 0,3 2,4 1,5 3,3 2,4 0,4 0,7 4 3,8 2,4 6,1 D + 0,3 2,8 1,75 3,8 2,75 0,4 0,75 4,5 4 2,5 6,4 D + 0,3 3 1,9 4 2,9 0,4 0,8 5 4,2 2,7 6,8 D + 0,3 3,2 2 4,2 3 0,4 1 6; 7 5,
32、1 3,2 8,2 D + 0,5 4 2,5 5,2 3,7 0,6 1,25 8 6,2 3,9 10 D + 0,5 5 3,2 6,7 4,9 0,6 1,5 10 7,3 4,6 11,6 D + 0,5 6 3,8 7,8 5,6 0,8 1,75 12 8,3 5,2 13,3 D + 0,5 7 4,3 9,1 6,4 1 2 14; 16 9,3 5,8 14,8 D + 0,5 8 5 10,3 7,3 1 2,5 18; 20; 22 11,2 7 17,9 D + 0,5 10 6,3 13 9,3 1,2 3 24; 27 13,1 8,2 21 D + 0,5 12
33、 7,5 15,2 10,7 1,6 3,5 30; 33 15,2 9,5 24,3 D + 0,5 14 9 17,7 12,7 1,6 4 36; 39 16,8 10,5 26,9 D + 0,5 16 10 20 14 2 4,5 42; 45 18,4 11,5 29,4 D + 0,5 18 11 23 16 2 5 48; 52 20,8 13 33,3 D + 0,5 20 12,5 26 18,5 2,5 5,5 56; 60 22,4 14 35,8 D + 0,5 22 14 28 20 3,2 6 64; 68 24 15 38,4 D + 0,5 24 15 30
34、21 3,2 The dimensions specified are approximately equal to 6,3 to 4 P 4 to 2,5 P 10 to 6,3 P 4 P 2,5 P 0,5 P ae1to be used where no other indications are made in the individual standards or in drawings. be2only to be used where a short extension is required for technical reasons. ce3only to be used
35、where a long extension is required for technical reasons. dType C to be used where no other indications are made in the individual standards or in drawings. eType D only to be used where a short thread undercut is required for technical reasons. DIN 76-1:2016-08 10 For fine pitch threads, the dimens
36、ions of thread run-outs and thread undercuts shall be selected according to the pitch P. The dimensions of pipe threads are specified in DIN 76-2. The dimensions of trapezoidal threads, buttress threads, knuckle threads and other coarse pitch threads are specified in DIN 76-3. For other types of scr
37、ew thread (e.g. UNF thread), it is recommended that the relationships between thread run-out, thread undercut and the pitch (e.g. x1= 2,5 P; see Tables 1 and 2) be used correspondingly. DIN 76-1:2016-08 11 Bibliography DIN 76-2, Thread run-outs and thread undercuts for pipe threads conforming to ISO
38、 228 Part 1 DIN 76-3, Runouts, Undercuts for Trapezoidal Threads, Buttress Threads and Knuckle Threads and other Threads of Coarse Pitch ISO 3508:1976, Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262 ISO 4755:1983, Fasteners Thread undercuts for external metric ISO threads
