din76-螺纹退刀槽

1、DEUTSCHE NORMJune 2004Thread run-outs and thread undercuts forISO metric threads as in DIN 13-1Gewindeauslufe und Gewindefreistiche Teil 1: Fr Metrisches ISO-Gewinde nach DIN 13-176-1SupersedesDecember 1983 edition.In keeping with current practice in standards published by the International Organiza

2、tion for Standardization(ISO), a comma has been used throughout as the decimal marker.ForewordThis standard has been prepared by Technical Committee Fachgrundnormen of the NormenausschussMechanische Verbindungselemente (Fasteners Standards Committee).It is based on International Standards ISO 3508 :

3、 1976 and ISO 4755 : 1983. As a departure from ISO 4755,which specifies only one type of thread undercut with g2max = 3 P, this standard specifies two types, i.e. typeA with g2max = 3,5 P (normal design) and type B with g2max = 2,5 P (short design). Type B thread undercutsare intended for use on a c

4、ase-by-case basis, where required for technical reasons; the use of special toolsis necessary here.It should be noted that ISO 3508 and ISO 4755 do not contain specifications for thread run-outs and threadundercuts for internal threads.AmendmentsThis standard differs from the December 1983 edition i

5、n that it has been editorially revised.Previous editionsDIN 2352: 1924-11; DIN LON 369-1 = DIN 30140-1:1936-12; DIN 76-1: 1924-09, 1943-04, 1953-11,1965-09, 1967-06, 1975-09, 1983-12.All dimensions are in millimetres.1ScopeThis standard specifies dimensions for thread run-outs and thread undercuts f

6、or bolts, screws and similarcomponents with external or internal ISO metric (coarse or fine pitch) thread as in DIN 13-1 and DIN ISO 261.2Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appr

7、opriate places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this standard only when incorporated in it by amendment or revision. For undated references, thelatest edition of the publi

8、cation referred to applies.DIN 13-1DIN 76-2DIN 76-3DIN EN 28839General purpose ISO metric screw threads Nominal sizes for 1 mm to 68 mm diametercoarse pitch threadsThread run-outs and thread undercuts for pipe threads conforming to ISO 228-1Thread run-outs and thread undercuts for trapezoidal thread

9、s, buttress threads, knucklethreads and other coarse pitch threadsMechanical properties of fasteners Bolts, screws, studs and nuts made of non-ferrousmetals (ISO 8839 : 1986)Document comprises 5 pages.Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulte

10、d as the authoritative text.No part of this translation may be reproduced without the prior permission ofDINDeutsches Institut fr Normung e.V., Berlin. Beuth Verlag GmbH, 10772Berlin, Germany,Page2DIN 76-1:2004-06DIN EN ISO 898-1DIN ISO 261ISO 3508 : 1976ISO 4755 : 1983Mechanical properties of faste

11、ners made of carbon steel and alloy steel Part 1: Bolts,screws and studs (ISO 898-1 : 1999)ISO general purpose metric screw threads General plan (ISO 261 : 1998)Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262Fasteners Thread undercuts for external metric ISO threads3

12、3.1Dimensions and designationExternal threads3.1.1Thread run-outsThread run-out dimensions shall be as given in figures 1 and 2 and table 1.Key to figure1Shank diameter R pitch diameterFigure1:Thread run-out dimensions (notation)3.1.2Distance from last full form thread to bearing face, a(for fully t

13、hreaded components)Figure2:Dimension a (notation)3.1.3Thread undercutsThread undercut dimensions shall be as given in figure 3 and table 1.It should be noted that fasteners with thread undercut do not meet the requirements for minimum breaking loadas specified in DIN EN ISO 898-1 or minimum breaking

14、 torque as specified in DIN EN 28839.Type A, with g1 and g2 of normal designType B, with g1 and g2of short designFigure 3:Thread undercut dimensions (notation)Page3DIN 76-1:2004-06Designation of a type B thread undercut (B):Thread undercut DIN 76 BTable1:Dimensions of thread run-outs and thread unde

15、rcuts for external threadsThread run-outNominal diameter(s),Threaddpitch P(coarse thread) 1,2 x1x2a1Distancea2a3dgThread undercut g1g2r| Type AType B Type A Type BNormal123)Short4Long567)(short)878)0,6 0,3 0,6 d 0,3 d 0,4 d 0,5 d 0,6 d 0,7 d 0,7 d 0,8 d 1 d 1,11,7; 0,92,3 1 2,5; 1,1 5 6; 7 14; 20; 2

16、7 33 39 45 48; 52 60 64; 68 The dimensions spec-ified are approxi-mately equal to1) 2) 3) 4) 5) 6) 7) 8)11,9 1 d 1,2 d 1,3d 1,6 3,2 1,6 3 4,3 2,2 5 d 26 d 2,3 7 d 2,6d 3 5 10 d 3,6d 4,4 9 7 14 d 5d 5,7 11 9 18 d 6,4 d 7 14 7 11 22 d 7,7d 8,3 2,5 PPPPP3,5 PP0,5 P x1 to be used where no other indicati

17、ons are made in product standards or on drawings. x2 to be used where a short thread run-out is required for technical reasons.a1 to be used where no other indications are made in product standards or on drawings.a2 to be used for slotted and cross recessed head screws and in cases where a short dis

18、tance is required for techni-cal reasons.a3 to be used for screws assigned to product grade C. Tolerance h12 for screw threads up to 3 mm nominal diameter.Type A to be used where no other indications are made in product standards or on drawings. Type B to be used where a short thread undercut is req

19、uired for technical reasons.Page4DIN 76-1:2004-063.2Internal threads (blind tapped holes)3.2.1Blind tapped holes with thread run-outThe dimensions of blind tapped holes with thread run-out shall be as given in figure 4 and table 2.1)Key to figurebUseful thread length0,5Limit deviations for the calcu

20、lated value of t: +0 P.2)da,min = 1 d, da,max = 1,05 d.For nuts, the countersink diameters, da, are specified in the relevant dimensional standards.3)Special designs (e.g. 90 or 60 countersink) shall be indicated on the drawing. A 60 countersink isrecommended for studs with thread run-out and for ce

21、ntre holes, and a parallel countersink is recommendedfor light alloy studs.1)Figure4:Dimensions of blind tapped holes with thread run-out (notation)3.2.2Blind tapped holes with thread undercutThe dimensions of blind tapped holes with thread undercut shall be as given in figure 5 and table 2.Type C,

22、with g1 and g2 of normal designType D, with g1 and g2 of short design1)Key to figurebUseful thead length1)0,5Limit deviation for the calculated value of t: +0 P.Other dimensions as in figure 4.Figure5:Dimensions of blind tapped holes with thread undercut (notation)Designation of a type C blind tappe

23、d hole with thread undercut:Blind tapped hole DIN 76 C2)3)Page5DIN 76-1:2004-06Table2:Dimensions of thread run-outs and thread undercuts for internal threadsNominal diameter(s),Threaddpitch, P(coarse thread)Thread run-out *) (guideline values) e1e2e3dg H13Thread undercutg1 Min.Type C Type Dg1Max.Typ

24、e C Type Dr|ong3) Normal12(normal)4)(short)545)d + 0,1 1,2 1,5 1 2,4 d + 0,1 d + 0,1 1,7; 2,3 2,5; 7 2,1 2,6 1,3 1,6 3,3 d + 0,2 d + 0,2 4,1 d + 0,2 d + 0,3 d + 0,3 d + 0,34 PP 0,5 P 4 2,5 6,4 d + 0,3d + 0,3 d + 0,5 6,2 8,33,9 5,2d + 0,5 10d + 0,5 13,3 d + 0,516 d + 0,5 20; 7 d + 0,5 27 d + 0,5 33 3

25、9 45 52 60 68 The dimensions spec-ified are approxi-mately equal to1) 2) 3) 4) 5)d + 0,5d + 0,5 d + 0,5 14 6,3 to 4 P4 to 2,5 Pd + 0,5 d + 0,5 d + 0,5 10 to 6,3 P*) Including blind hole extension.e1 to be used where no other indications are made in product standards or on drawings. e2 to be used wher