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UDC 621 791 : 621.753.12 DEUTSCHE NORM October 1987- I ~Generai talerances far welded structureslinear and angular dimensions 8570Part 1

Allgemeintoleranzen fur SchweiBkonstruktionen;Uingen- und WinkelmaBe

Supersedes October 1974 edition.

1 ScopeThis standard is intended to simplify drawings. It specifies generai tolerances for linearand angular dimensions o \tJe ded structures in four tolerance ciasses these being basedon customary workshop accuracv. The main criterion for the selection of a particulartolerance class should be the functional requirements which are to be met.f smaller tolerances are required, or if larger tolerances are both permissible and more

economical then thev shall be indicated individuallv in accordance with DIN 406 Part 2.2 Field of applicationGenerai tolerances for linear and angular dimensions as specified in this standard app1vfor weldments welding assemblies and welded structures when reference is made to thisstandard on drawings or related technical documents e.g. delivery specificationsl inaccordance with clause 4.The generai tolerances applv for linear dimensions e.g. external dimensions, internaidimensions offset dimensions, centre line distances and for angular dimensions, in thelatter case applving both for those that have been indicated in the drawing and thosethat are generallv not thus indicated, e.g. right angles, or the angles of regular polvgons.Special provisions may be needed for tlle linear dimensions of welded structures composed of a number of welding assemblies.Where, in manufacturing documentation reference is made to different standardscovering generai tolerances, the generai tolerances as specified in this standard sllallapplv for dimensions produced by welding.The specifications given in tllis standard are based on tlle principle of independency asspecified in ISO 8015, according to which tlle linear and geometrical tolerances app1vindependently of each other.Manufacturing documentation in whicll linear and angular dimensions are presentedwithout individually indicated tolerances sllall be deemed incomplete if tllere is no orinadequate reference to generai tolerances. This does not apply to temporarv dimensions.

Beuth Verlag GmbH. Berlin. has the exclusive righi of sale for Garman Standards D/N-Normen).04.91

Continued on pages 2 to 4

D/N 8570 Part 1 Engl Price group 5Sales No. 1 5

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Page 2 DIN 8570 Part 13 Generai tolerances for linear and angular dimensions3.1 limit deviatiom fo ' linear dimensionsTable 1. limit deviations fo ' linea ' dimensions

Range of nominaI sizes, in mm

Tolerancec ass 1 2to30

i Over30t up to l Over I Over l Over 1 o v e r - - - ' l c - - o - v - e - r - - - r I , I - 8 0 0 0 o - v - e r - - - o - ~ ' ~ ' r I Over I Overl 120 400 I 1000 I 2000 4000 12000 16000 I 20000l : ~ ~ . l _ ~ _ ~ _ . t _ o - - - , i _ ~ _ 6 0 0 _ t _ o _ L ~ I 1U; I I12

Limit deviations, in mmA 1 1 2 3 4 5 :16 7 l 8 9

1- - . .. ' . , ----- .-B 2 :1: 3 4 6 8 10 12 14 16

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DIN 8570 Part 1 Page 3

\ /Reference point,----

~ ~Reference poin

Figure 1.

\~ ~

~ > ; /\ { ~ \ ~? r - - - - " ' J . ~ W " " O > O " " - _ _ ,

/Reference pointFigure 2 Figure 3.

X ~.... /~ = ~ , .

Figure 4. Reference point Figure 5.

Standards l'eferred toDIN 406 Part 2 Dimensioning on drawings; basic principlesDIN 862 Vernier calipers; concepts, requirements, testingDIN 875 90 steel squaresDIN 6403DIN 8570Part3DIN 66050

Steel rneasuring tapes with winder frames or winder casesGenerai tolerances for welded structUrE S; form and positionFitness for purpose; concept

ISO 8015 Technical drawings; fundamental tolerancing principlesOtilel" relsvant standardsDIN 7168 Part 1 Generai tolerances; linear and angular dimensionsDIN 7168 Part 2 Generai tolerances; geornetrical tolerances

, \ V - i Reference point~

DIN 8563 Part 3 Quality assurance of welded structures; fusion-welded joints in steel (except beam weldingl; requirernents, classificationD'N 8563 Part 30 Quality assurance of welded structures; fusion-welded joints in alurninium and aluminiurn alloys

except bearn welding); requirernents, classificationPrevious editionsDIN 25029: 04,62 D IN 8570 Part 1: 04.71, 10.74.AmendmentsThe following arnendments have been rnade to the October 1974 edition:a) the standard has been brought into line with new developrnents in standardization;b) tolerance class Z has been introduced for special applications.

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Page 4 DIN 8570 Part 1Explanatory notesThe publication of standards covering both generaitoierances for linear and angular dimensions (DIN 8570Part i) and generai geometrical tolerances (toleranceson straightness, flatness and parallelism, in DIN 8570Part 3) has proved a successoThe present revised edition of the standard largely repro-duces the content of its predecessor, but has taken recentdevelopments in the field of standardization into account,in particular the specifications of DIN 7168 Part 1 inrespect of generai tolerances for linear and angulardimensions. In accordance with DIN 7168 Part 1, thesize steps in the range from 120 mm to 1000 mm havebeen changed trom over 120 up to 315 mm to over120 up to 400 mm . and trom over 315 up to1000 mm to over 400 up to 1000 mm", the resultbeing a smoother progression of the size steps. Thefurther consequence, namely that the generai tolerancesin the 315 mm to 400 mm range are now reduced, wasnot considered to be a serious impediment, even withregard to existing drawings.The standard specifies generai tolerances for linear andangular dimansions of welded structures, withoutrestriction to particular applications, and is to be appliedfor such structures unless other special provisions takeprecedence.The tolerance classes specified make due allowance fordiffering requirements in the various fields of application,but basically reflect customary workshop accuracy. The

Intemational Patent CiassificationG 1 BB 23 K

difficulties involved in maintaining a given toleranceclass are not the same for ali classes. The higher the class,the more difficult it is to maintain, so that the tolerancectass shou d be selected to meet only the actual require-ments.In one and the same drawing, different to/erance classesmay be selected for the linear and angutar tolerances asspecified in this standard and for the geometrica to er-ances specified in DIN 8570 Part 3. In order to indicate,for example, that tolarance class A has been selected forthe generai tolerance for linear and angular dimansions,and tolarance class F for tha generai geometrical toler-ances, the indication on the drawings shou d read"D N 8570 AF , The tolerances need not be indicatedfor each nominai size separately, a generai reference tothe tolerance class in the drawings and or other docu-ments (e.g. delivery specifications, working papers) beingsufficient.Two dimensionai systems hava been specified as equallyapplicable for determining the angular deviation, namelydegrees and minutes and mm/m calculated and roundedto the nearest mm, as this permits in e8ch case theapplication of the most suitable and effi cient measuringmethod and the use of the available measuring devices.When indicating angles, the position of the intersectionpoint of the two leg may be of such importance that itought to be specially marked and dimensioned as a"reference point (see figures 1 to 5 .

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UDC 621.791: 621.753.14 DEUTSCHE NORM October 1987

Generai talerances far welded structures DIN-Geometrical tolerances 8570Part 3

Allgemeintoieranzen fur Schweil3konstruktionen;Form und Lage

Supersedes October 1974 editionwithdrawn in January 1986.

In keeping with current practice in standards published by che International Organization for Standardization ISO),a comma h s been used throughout s me decimaI marker.

1 ScopeThis standard is intendsd to simplify drawings. It specifies generai tolerances of formand position for welded structures in four tolerance classes, these being based on customary workshop aeeuracy. The main criterion for the selection of a particular to/eranceclass should be the functional requirements \ vhich are to be metIf smaller geometrica tolerances are required, or if larger toleranees are both permittedand more economical then they shall be indicated individually in accordance withISO 1101.2 Field of applicatiol1Generai toleranees of form and position as specified in th is standard apply for weldments, welding assemblies and welded structures when reference is made to this standard on drawings or related technical documents (s. g delivery specifications) in accordance with clause 5The specifications given in this standard are based on the principle of independency asspecified in ISO 8015, according to which dimensionai and geometrie tolerances applyindependently of each other. Where other tolerancing principles are to be followed,this shall be explicitly stated in the drawings.3 ConceptsStraightness tolerance flatness tolerance and parallelism tolerance are to be understoodas defined in subclauses 14.1,14.2 and 14.7, respeetively, of the March 1985 editionof/SO 1101.4 Straightness, flatness and parallelism tolerancesThe straightness, flatness and parallelism tolerancss as specified in the following tableapply both for the overal dimensions of a weldment a welding assembly, or a weldedstructure and also for sections for which the dimensions are indicated.Other tolerances of form and position e.g. coaxiality and symmetry tolerances, havenot been specified. If such tolerances are required for reasons of function they shall beindicated on the drawings as specified in ISO 1101.

Continued on pages 2 to 4

Beulh Verlag GmbH Berlin. has the exelusive righI 1 sale far German Standards DIN-Normen). D N 8570 Part 3 Engl.08.91 Sales No. 0105

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Page 2 DIN 8570 Part 3Table. Straightness, fiatness and parallelism tolerances

Range of nominai sizes, in mm (relates to longer si de of the surface)

n'ver Over Over Over Over Over Over Over OverToleranee 30 120 400 1000 2000 4000 8000 12000 16000 20000class up to up to up to up to up to up to up to up to up to120 400 1000 I 2000 4000 8000 I 12000 16000 20000Toleranees, in mm

E 0 5 1 5 2 4 5 6 I 7 8IF 1 3 i 4 5 6 8 10 12 14 16G 1 5 3 5 5 9 11 16 20 22 25 25- - .H 2,5 5 9 14 18 26 32 36 40 40

5 Indications Ori drawingsThe designation of tne selected to erance elass as specified in this standard (e.g. DiN 85O-F or its eombination witha toleranee class as specified in DIN 8570 Part 1 (e.g. DIN 8570-AFI shall be entered in the appropriate area on thedrawing.6 TestingTesting and measuring deviees eomplying with DIN Standards shall be used for determining the deviations, e.g.DIN 18701 graduated steel straightedges, DIN 6403 tape measures, straightedges eomplying with DIN 874 Part 1 or 2DIN 875 squares, DIN 862 vernier calipers, or DIN 878 dial gauges.Other testing and measuring devices may be used by agreement.The results of measurement may be falsified if they are obtained under unusual temperature or atmospheric conditions,e.g in strong suntight.Examples of the determination of deviations are shown in figures 1 to 3.6.1 StraightnessThe edge of the weldment and the straightedge shall be aligned in such a way that the greatest distanee betwecn thestraightedge and the actual surface is at its minimum. The distances between the edge and the straightedge shall bemeasured.J [ I ~ ~ hmax - hmin ;s; tFigure 1. Straightness test6.2 FlatnessThe aetual surfaee of the weldment and the measuringpiane shall be aligned to eaeh other in sueh a way that thegreatest distanee between the measuring piane and theactual surface is at its minimum. This may be effeeted,for example, with the aid of optieal deviees, tubular waterlevels, span wires, floor plates, surfaee plates, and machinebads.The distanees between the actual surface and the measuring piane shall be measured.6.3 ParallelismThe referenee surface shall be aligned parallel to the referenee piane.A measuring piane shall be established parallel to thereference piane and apart trom the weldment, using themeasuring devices referred to in subclause 6.2. The distances between the aetual surface and the measuring pianeshall be measured.

/ Measuring piane, >

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DIN 8570 Part 3 Page 3

xMeasuring piane

Reference surfaceReference piane

Figure 3. Parallelism test

7 Usability decision the use of compooents not complying with this standard may be made on the basis of their fitness forpurpose (as defined n DIN 66050).Standards referred toDIN 862 Vernier calipers; concepts, requirements, testingDIN 874 Part 1DIN 874 PartDIN 875DIN 878DlN 6403DIN 8570 Part 1DIN 18701DIN 66050ISO 1101ISO 8015

Steel straightedges; dimensions, technical delivery conditionsKnife-edge straightedges; dimensions, technical delivery conditions90 steel squaresDial gaugesSteel measuring tapes with winder frames or winder casesGenerai tolerances far welded structures; linear and angular dimensionsGraduated steel straightedgesFitness for purpose; conceptTechnical drawings; geometrical tolerancing, tolerancing of fOnTI, orientation, location and run-out;generalities, definitions, symbols, indications on drawingsTechnical drawings; fundamental tolerancing principles

Other relevant standardsDIN 7168 Part 1 Generai tolerances; linear and angular dimensionsDIN 7168 Part 2 Generai tolerances; geometrica I tolerancesDIN 8563 Part 3 Quali ty assurance of welded structures; fusion-welded joints n steel except beam welding); require

ments, classificationDIN 8563 Part 30 Quality assurance of welded structures; fusion-welded joints n aluminium and aluminium alloys

except beam welding); requirements, classificationPrevious editionDIN 8570 Part 3: 10.74.AmendmentsThe following amendments have been made to the October 1974 edition of this standard, withdrawn n January 1986.a) The standard has been brought into line with new developments n standardization.b) The status of the standard s now that of a full standard.

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Page 4 DIN 8570 Part 3Explanatory notesThe publication of standards covering both generai toler-ances for linear and angular dimensions (DIN 8570 Part 1)and generaI geometrical tolerances (tolerances on straight-ness, flatness and parallelism, in DIN 8570 Part 3) hasproved a successoThe present revised edition of the standard largely repro-duces the content of the preliminary standard whichpreceded it, but has taken recent developments in thefield of standardization into account, in particular thespecifications of DIN 7168 Part 2 in respect of generaigeometrical tolerances and of ISO 1101 with regard toconcepts and to the indication of geometrical toleranceson drawings. In accordance with DIN 7168 Part 2, thesize steps in the range from 120 mm to 1000 mm havebeen changed to "over 120 up to 400 mm (previously315 mm instead of 400 mm) and to "over 400 pr.vi-ausiy 315) up to 1000 mm , the result being a smootherpragression of the size steps. The further consequence,namely that the generai tolerances in the 315 mm to4 mm range are n VJ reduc d w s not considered tobe a serious impediment, even with regard to ex istingdrawings.The tolerance classes are designated by code letters E,F, G, H. These code letters follow on trom the letters A,B, C, D specified in the tables for linear and angular tal-erances in DIN 8570 Part 1. The purpose of using lettersin alphabetical sequence is to avoid mistakes being made

Intemational Patent ClassificationG 01 B

23 K

in drawings when the tolerances for linear and angulardimensions and those for form and position are beingentered.On one and the same drawing, different tolerance classesmay be indicated for the linear and angular tolerancesspecified in DIN 8570 Part 1 and for the geometricaltolerances specified in this standard. in order to indicate,for example, that tolerance c ass A has baen selected forthe generai tolerance for linear and angular dimensions,and tolerance class F for the geometrica tolerances, theindication on the drawings should read "DIN 8570 AF .The four to erance c asses specified make due allowancefor differing requirements in the various fields of app i-cation, but basically reflect customary workshop accu-racy. The d ifficulties involved in maintaining a giventolerance class are not the same for ali classes. Thehgher the class, the more diffcult t is to maintain,so that the tolerance class should be selected to meetonly the actual requirements.As generai tolerances are based on customary workshopaccuracy, no checks, or only spot checks, are usuallymade to verify whether they have been maintained. Forarbitration or inspection control purposes, specificationshave been given here with regard to testing, which maybe usefully supplemented by the Beuth CommentaryPrufverfahren fur Farm un Lageabweichungen (Proce-dures for establishing deviations of form and position).