1、ICS 21.040.10Descriptors:Metric taper external screw threads,parallel internalscrew threads,dimensions,tolerances,inspection.Metrisches kegeliges Auengewinde mit zugehrigem zylindrischem Innengewinde Teil 1:Nennmae,Grenzabmae,Grenzmae und PrfungRef.No.DIN 158-1:1997-06English price group 09Sales No.
2、010903.99DEUTSCHE NORMJune 1997158-1Continued on pages 2 to 10.No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e.V.,Berlin.Beuth Verlag GmbH,D-10772 Berlin,has the exclusive right of sale for German Standards(DIN-Normen).Translation by D
3、IN-Sprachendienst.In case of doubt,the German-language original should be consulted as the authoritative text.Metric taper external and mating parallelinternal screw threadsPart 1:Dimensions,tolerances and inspectionSupersedes DIN 158,August 1986 edition.In keeping with current practice in standards
4、 published by the International Organization for Standardization(ISO),a comma has been used throughout as the decimal marker.ForewordThis standard has been prepared by the Section Gewinde of the Normenausschu Technische Grundlagen(Fundamentals in Technology Standards Committee).AmendmentsThe followi
5、ng amendments have been made to the August 1986 edition of DIN 158.a)The number of the standard has been changed.b)The values of thread height,h3,have been amended(cf.table 2),taking into consideration the limitdeviations specified in table 3.c)The designation of taper external threads has been amen
6、ded to include the letters keg(taper)todistinguish them from parallel external threads.d)The standard has been editorially revised.Previous editionsDIN 158-1:1954-06;DIN 158:1971-04,1986-08.Dimensions in mm1Scope and field of applicationThis standard specifies profiles,dimensions and methods of veri
7、fication for general purpose metric taperexternal threads intended to be mated with parallel internal threads with a basic profile as specified inISO/DIS 68-1.Taper external threads as specified in this standard are intended for self-sealing joints,such as thoseemployed on pipe plugs,compression cou
8、plings and lubricating nipples.They can be used in all cases wherea parallel threaded joint with washer is unsatisfactory for technical or economic reasons.For fluids such as oils,other liquids and gases,no thread sealants are required for joints where the nominalsize is small.For joints of greater
9、nominal size,it is recommended that sealants be applied,since theleaktightness of such joints decreases as the diameter increases.A short design taper external thread has been specified along with the standard design both to be matedwith general purpose ISO metric parallel internal threads of tolera
10、nce class 4H for the pitch diameter and 5Hfor the minor diameter(as in ISO/DIS 965-1).Als Papierkopie-kein nderungsdienst/Printed copy-no alert servicePage 2DIN 158-1:1997-062Normative referencesThis standard incorporates,by dated or undated reference,provisions from other publications.These normati
11、vereferences are cited at the appropriate places in the text and the titles of the publications are listed below.Fordated references,subsequent amendments to or revisions of any of these publications apply to this standardonly when incorporated in it by amendment or revision.For undated references,t
12、he latest edition of thepublication referred to applies.DIN 13-1ISO metric screw threads 1 mm to 68 mm diameter coarse pitch threads Nominalsizes*)DIN 13-5ISO metric screw threads 1 mm and 1,25 mm fine pitch threads with diameters from7,5 mm to 200 mm Nominal sizes*)DIN 13-6ISO metric screw threads
13、1,5 mm fine pitch threads with diameters from 12 mm to300 mm Nominal sizes*)DIN 13-7ISO metric screw threads 2 mm fine pitch threads with diameters from 17 mm to300 mm Nominal sizes*)DIN 13-19ISO metric screw threads Basic profile and manufacturing profiles*)DIN 158-2Metric taper external screw thre
14、ads and mating internal parallel screw threads Part 2:Gauges and gaugingDIN 2244Screw threads TerminologyISO/DIS 68-1:1998ISO general purpose screw threads Basic profileISO/DIS 965-1:1998ISO general purpose metric screw threads Tolerances Part 1:Principles andbasic dataISO/DIS 965-3:1998ISO general
15、purpose metric screw threads Tolerances Part 3:Deviations forconstructional threadsISO 1502:1996ISO general-purpose metric screw threads Gauges and gauging3Concepts amd symbols3.1ConceptsFor the purposes of this standard,the concepts specified in DIN 2244 shall apply.3.2SymbolsFor symbols,see table
16、1.Table 1:SymbolsSymbolQuantityaDistance from reference plane to external thread endbGauge lengthdMajor diameter of external thread at gauge planed2Pitch diameter of external thread at gauge planed3Minor diameter of external thread at gauge planeDMajor diameter of internal threadD1Minor diameter of
17、internal threadD2Pitch diameter of internal threaddMajor diameter of external thread at gauge planed2Pitch diameter of external thread at gauge planed3Minor diameter of external thread at gauge planeHHeight of triangle of thread profile perpendicular to thread axisH1Flank overlappingh3Height of thre
18、adl1Useful length of external threadl2Useful length of internal threadRRoot radiusPPitchxThread run-out*)At present at the stage of draft.Als Papierkopie-kein nderungsdienst/Printed copy-no alert service4Design profiles and designation4.1Taper external threadsThe nominal sizes,limit deviations and l
19、imits of size are given in tables 2,3 and 4,respectively.Figure 1:Design profile of a metric taper external threadDesignation of a standard design M 30 2 keg external thread:Thread DIN 158 M 30 2 kegDesignation of a short design(short)M 30 2 keg external thread:Thread DIN 158 M 30 2 keg shortReferen
20、ce planeReference planeGauge planeGauge planeThread axisPage 3DIN 158-1:1997-06Als Papierkopie-kein nderungsdienst/Printed copy-no alert serviceTable 2:Nominal sizes for taper external threads(continued)Thread sizePitch,PUseful threadlength,l1StandarddesignShortdesignStandarddesignStandarddesignShor
21、tdesignShortdesignShortdesignStandarddesignMaximum height ofthread,h3Dimensions at reference planeDimension aThread dimensions atgauge planeMajordiameter,dPitchdiameter,d2Dimensions at gauge planeThread dimensionsGauge length bMinordiameter,d3Page 4DIN 158-1:1997-06Als Papierkopie-kein nderungsdiens
22、t/Printed copy-no alert serviceTable 2(concluded)Bracketed sizes should be avoided where possible.Thread sizePitch,PUseful threadlength,l1StandarddesignShortdesignStandarddesignStandarddesignShortdesignShortdesignShortdesignStandarddesignMaximum height ofthread,h3Dimensions at reference planeDimensi
23、on aThread dimensions atgauge planeMajordiameter,dPitchdiameter,d2Dimensions at gauge planeThread dimensionsGauge length bMinordiameter,d3Page 5DIN 158-1:1997-06Als Papierkopie-kein nderungsdienst/Printed copy-no alert service4.2Parallel internal threadsParallel internal threads shall have the basic
24、 profile specified in ISO/DIS 68-1.The maximum and minimummaterial profiles shall be as given in DIN 13-19*).The nominal sizes of coarse pitch threads shall conform to DIN 13-1*),those of fine pitch threads with pitchesof 1 mm or 1,25 mm to DIN 13-5*),with a pitch of 1,5 mm to DIN 13-6*),and those w
25、ith a pitch of 2 mm,toDIN 13-7*).Limit deviations shall be as given in ISO/DIS 965-3.Limits of size and the useful length,l2,shall be as given intable 5 and clause 5,respectively.The thread designation shall conform to ISO/DIS 965-1.Example of designation for a metric parallel internal thread(M),wit
26、h a nominal diameter of 30 mm and a pitchof 2 mm(fine pitch thread),of tolerance class 4H for the pitch diameter and tolerance class 5H for the minordiameter:Thread DIN 158 M 30 2 4H 5H5Tolerances,limit deviations and limits of size1)Internally threaded parts shall be capable of receiving external t
27、hreaded parts up to the useful length,l1,making full use of dimension a.2)Assuming a free thread run-out,length l2 of the internal thread shall not be less than 80%of l1.3)It is recommended that the thread run-out,x,be 1,5 P.Figure 2:Internal and external threads(notation)*)At present at the stage o
28、f draft.Taper externalthreadReference planeGauge planeParallel internal threadTaper external threadReference planeGauge planePage 6DIN 158-1:1997-06Als Papierkopie-kein nderungsdienst/Printed copy-no alert serviceTable 3:Limit deviations for external threadsThread sizeStandard designDimensions a,b a
29、nd l1*)Short designMajor,pitch and minor diameters*)Short designStandard design*)The limit deviations for a and b are only applicable to the basic thread sizes listed in table 2.*)The limit deviations apply at any cross section(perpendicular to the thread axis)and within length l1.(The tolerance zon
30、e thus lies parallel to the generatrix of the basic taper.)These limit deviations apply only when the threads are measured,in which case it shall be assumed thatdimensions a and b are nominal sizes(cf.clause 6).Page 7DIN 158-1:1997-06Als Papierkopie-kein nderungsdienst/Printed copy-no alert serviceT
31、able 4:Limits of size for taper external threads at gauge planeThread sizeStandard designMajor diameter,dPitch diameter,d2Minor diameter,d3MaximumMinimumMinimumMinimumMinimumMinimumMinimumMaximumMaximumMaximumMaximumMaximumShort designMajor diameter,dPitch diameter,d2Minor diameter,d3Page 8DIN 158-1
32、:1997-06Als Papierkopie-kein nderungsdienst/Printed copy-no alert serviceFigure 3:Parallel internal thread(tolerance position H)D1(minimum)D1(maximum)D2(minimum)D2(maximum)D(minimum)Table 5:Limits of size for parallel internal threads(with tolerance class 4H for pitch diameterand 5H for minor diamet
33、er)(derived from ISO/DIS 965-3)Thread sizeMinimum majordiameter,DPitch diameter,D24HMinimumMaximumMaximumMinimumMinor diameter,D15HPage 9DIN 158-1:1997-06Als Papierkopie-kein nderungsdienst/Printed copy-no alert service6InspectionIn practice,taper external threads are mostly checked using commercial
34、 screw gauges.The end face of thethreaded portion is pressed against a step in the gauge(tolerance step),and the limits of size of the thread atthe gauge plane are determined,disregarding dimensions a and b(since these dimensions may be taken astheoretically exact).Normally,thread diameters are meas
35、ured at the gauge plane.However,in order to detect any crowning of thethread,the thread dimensions may be checked at the reference plane(or any other plane along the useful threadlength).Gauges should be selected according to the thread parameters that are being checked.For instance,taperscrew ring
36、gauges are suitable when checking all thread parameters,whereas parallel screw ring gauges areadequate when only the function of the thread is being checked.In both cases,however,the width of the gaugering has to be adjusted for the thread design(standard or short).The ring is then screwed on the wo
37、rkpiece andthe distance between the end faces of the workpiece and gauge is established.When the ring gauge is providedwith a step face,the end face of the workpiece thread is not to protrude beyond this step.(DIN 158-2 specifiesparallel ring gauges with tolerance steps,in accordance with ISO 1502.)
38、Although the incomplete thread of parallel ring gauges must be removed,this may influence the inspectionresults.For this reason,such gauges are to be regularly checked for wear using taper screw check plugs.Since gauging and measuring threads may lead to different results,there is a risk of rejectio
39、n in marginal cases.It is therefore recommended that manufacturers and their clients agree on the method to be used.Where noagreement has been made,results of gauging in accordance with DIN 158-2 shall be decisive.Explanatory notesThis standard specifies taper external threads with a basic taper of
40、1:16 and a thread profile that is perpen-dicular to the thread axis.It is more economical to mate taper external threads with the parallel internal threadsspecified here rather than with taper internal threads,as the former are easier to manufacture.To cater for thin-walled components that require s
41、hort thread lengths,a short design of taper external threadhas been specified along with the standard design.The nominal sizes given in table 2 are based on the assumption that the dimensions lie perpendicular to thethread axis at the reference or gauge plane.The limit deviations for the thread diameters have been calculatedfrom the following formula:Ag=tAa C,where C=1:16,i.e.whereAgis the thread diameter;Aais the deviation for dimensions a or b;Cis the taper.AAga=16Page 10DIN 158-1:1997-06Als Papierkopie-kein nderungsdienst/Printed copy-no alert service
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