Manufacturing Instructions

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1 May 216 Manufacturing Instructions Mechanical processing SN 2-5 ICS 25.2 Dimensions in mm Supersedes SN 2-5:21-9 Table of contents 1 Scope Normative references Manufacturing specifications General lerances for lengths, angles, radii of curvature and chamfer heights Application Degree of accuracy Linear dimensions Radii of curvature and chamfer heights Angular dimensions Angular dimensions for lubrication holes General lerances on shape and position Application Degree of accuracy Shape Position Surface quality Workpiece edge Hole centerline lerance in deep drilling Threads Tolerances for metric ISO threads Thread runout, thread undercut Heat treatment Inspection Basic specifications Checking of dimensions, requirements for measuring equipment Inspection documentation Tolerances and limit deviations for linear dimensions from 1 1, mm Application Designation of lerance series Standard lerances Limit dimensions for external and internal dimensions in the nominal dimension range up 315 mm Limit dimensions for external and internal dimensions in the nominal dimension range from 315 mm 1, mm 11 Annex A (for information) - Representation on drawings Annex B (for information) - Surface roughness values Referenced technical standards, codes and regulations Revision of May Page Edited by: SMS group Standards Office SMS group GmbH 216 "The present document is protected by copyright. Reproduction, distribution and utilization of this document as well as communication of its contents others are prohibited unless expressly authorized by us. Any violations will be prosecuted under criminal law and will result in an obligation pay damages. All rights reserved." Number of pages: 23

2 Page 2 SN 2-5: Scope This company standard defines for SMS group the manufacturing specifications and inspections for parts which are used as starting material and/or manufacturing material in SMS group products and which undergo metal cutting working (machining). 2 Normative references The documents listed below are required for the application of this standard. Dated references refer only the edition of the date indicated. Undated references refer the latest edition of the respective document inclusive of all revisions. SN 2-1 SN 2-1 Manufacturing Instructions; Requirements and principles Manufacturing Instructions - Inspection 3 Manufacturing specifications 3.1 General lerances for lengths, angles, radii of curvature and chamfer heights Application General lerances according DIN ISO : for lengths, angles, radii of curvature and chamfer heights shall be applied machined parts. They apply dimensions without lerance indication between two machined surfaces of a part made of any metallic material provided that no material-specific general lerances are defined in other specifications. When no individual lerances are indicated for dimensions between an unmachined surface and a machined surface of a part, half the general lerances specified in the relevant standard for cast, rch-cut and forged parts shall be applied. An auxiliary dimension shown in brackets is a dimension which is not required for the geometrical definition (manufacture) of a part. General lerances do not apply - auxiliary dimensions according DIN which are shown in brackets; - non-indicated 9 angles between lines forming axes of coordinates Degree of accuracy General lerances are subject the following degree of accuracy: DIN ISO : m Linear dimensions The limit deviations for linear dimensions (e.g. external, internal, stepped dimensions, diameters, radii, distance dimensions) are indicated in table 1. The limit deviations indicated for sawing are SMS group specific values. Table 1 Linear dimensions Degree of accuracy Limit deviations for nominal dimension ranges b),5 a) 6 > 6 3 > 3 12 > 12 4 > 4 1 > 1 2 > 2 4 > 4 8 > 8 12 > > 16 2 m (medium) ±,1 ±,2 ±,3 ±,5 ±,8 ± 1,2 ± 2 ± 3 ± 4 ± 5 ± 6 Sawing ± 1 ± 2 ± 3 - a) Permissible limit deviations for nominal dimensions smaller than,5 mm are indicated direct at the nominal dimension. b) Values from,5 mm 4 mm correspond those of DIN ISO :1991-6, values > 4 mm 2, mm, those of DIN 7168:

3 Page 3 SN 2-5: Radii of curvature and chamfer heights The limit deviations for radii of curvature and chamfer heights (bevels) are shown in table 2. a) b) Degree of accuracy Table 2 Radii of curvature and chamfer heights Limit deviations for nominal dimension ranges b),5 a) > 3 > 6 > m (medium) ±,2 ±,5 ± 1 ± 2 ± 4 > 12 4 Permissible limit deviations for nominal dimensions smaller than,5 mm are indicated direct at the nominal dimension. Values from,5 mm 3 mm correspond those of DIN ISO :1991-6, values >3 mm 4 mm, those of DIN 7168: Angular dimensions The limit deviations for angular dimensions and the pertaining tangent values are indicated in table 3 and do not apply angular dimensions for lubrication holes, these are indicated in table 4. The maximum permissible deviation in mm is calculated by multiplying the tangent value by the length of the shorter leg. Any smaller angular lerance required is indicated on the drawing. Degree of accuracy Table 3 - Angular dimensions Limit deviations in angle units for nominal dimension ranges of the shorter leg > 1 > 5 > 12 > 4 Up m (medium) ± 1 ± 3' ± 2' ± 1' ± 5' Tangent values,175,87,58,29, Angular dimensions for lubrication holes The limit deviations for angular dimensions of lubrication holes and the pertaining tangent values are shown in Table 4. The maximum permissible deviation in mm is calculated by multiplying the tangent value by the length of the shorter leg. Lubrication holes can be identified by the metric thread and/or inch thread used at one end of the hole. Degree of accuracy Table 4 Angular dimensions for lubrication holes Limit deviations in angle units for nominal dimension ranges of the shorter leg Up 1 > 1 5 > 5 12 > 12 4 > 4 c (coarse) ± 1 3' ± 1 ± 3' ± 15' ± 1' Tangent values,262,175,87,44, General lerances on shape and position Application General lerances on form and location as in DIN ISO : are applicable machined parts. They also apply individual dimensions or dimensions leranced according the ISO lerance system Degree of accuracy Tolerances on form and location are subject the following degree of accuracy: DIN ISO : H

4 Page 4 SN 2-5: Shape Basic specification Tolerances on shape limit the extent which an individual element is allowed deviate from its geometrically ideal shape Flatness and straightness General lerances for straightness and flatness are stated in table 5. Tolerance class Table 5 Flatness and straightness General lerances for flatness and straightness for nominal dimension ranges Up 1 > 1 3 > 3 1 > 1 3 > 3 1 > 1 3 H,2,5,1,2,3, Roundness The shape lerances on roundness are stated in table 6. Table 6 Roundness Roundness Tolerance class lerance H Cylindricity, profile line and profile surface For cylindricity profile of any line and profile of any surface no general lerances have been determined Position Basic specification Tolerances on position limit the extent of deviation of the relative positions of two or more elements one of which is, for functional reasons or for the purpose of clear definition, normally used as reference element for the lerance indications. When necessary, more than one reference element can be specified. The reference element shall fulfil a sufficient degree of accuracy and a shape lerance shall be specified if necessary Parallelism The permissible position lerances for parallelism parallel lines or surfaces. are limited by the lerance assigned the distance between the Perpendicularity The general lerances for perpendicularity are stated in table 7. Tolerance class Table 7 Perpendicularity Up 1 Perpendicularity lerances for nominal dimension ranges for the shorter leg > 1 3 > 3 1 > 1 3 H,2,3,4,5

5 Page 5 SN 2-5: Symmetry The general lerances for non-rotation-symmetrical form elements are stated in table 8. The general lerance also applies if one of the symmetrical form elements possesses rotational symmetry and the other does not (for example universal joint-shaft heads and sockets). Tolerance class Table 8 Symmetry Symmetry lerances H, Coaxiality General lerances for coaxiality have not been specified. They shall not exceed the runout lerance stated in table 9. Table 9 Radial and axial runout Tolerance class Runout lerance H, Runout The general lerances for radial and axial runout are limited by the permissible lerance specified in table Total runout and angularity For tal runout and angularity no general lerances have been specified Position lerances for hole center distances and hole circle diameters There are no general lerances for position lerances except for hole center distances and hole circle diameters as in table 1. The SMS group specific lerances shown in Table 1 are be undersod as position lerances according DIN EN ISO 111:214-4 and apply non-leranced hole-center distances and hole-circle diameters. The indication of the position lerances prohibits the summation of the lerances. This means that the distances between the holes are theoretically exact coordinate dimensions without deviations the intersections of which define lerance cylinders corresponding the lerances shown in Table 1. Table 1 Position lerances for through holes and threaded holes Thread diameter M4 M5 M6 M8 M1 M12 M16 M2 M24 M3 M36 M42 M48 M56 M64 M72 M8 M9 M1 Through-hole a) 4,5 5,5 6, ,5 17, Series: medium Through-hole a) ,5 18, Series: coarse Ø.25 Ø,3 Ø,5 Ø,75 Ø 1, Ø 1,5 Ø 2, Ø 3, Ø 3,5 Positional lerance For tap hole and through-hole a) Through holes according SN 48-2:215-9

6 Page 6 SN 2-5: Surface quality Table 11 shows the standard surface qualities used by SMS group when no drawing indications are made. They are also valid when the summarising symbol is shown. In the drawings SMS group indicates the centerline average roughness R a as preferred measured variable, see Annex A (for information). Standard surface quality Table 11 Surface quality Application Linear dimensions referring surfaces without indication of roughness variables (e.g. surfaces produced by sawing) Holes up dia 4 mm, oblong holes, keeper plate slots Rough-machined parts, weld-in parts End faces for bolt head and nut supports - on rolled plate - on recesses for screws Undercuts, chamfers, threads, thread undercuts, keyseats, ways, lubrication grooves, end faces Example 1 Example 2 The following applies radii, curvatures and chamfers 5 mm: - all inner curvatures, example 1, shall have the finer surface quality of the adjoining surfaces, - all outer curvatures, example 2, shall have the coarser surface quality of the adjoining surfaces, - all chamfers shall have the coarser surface quality of the adjoining surface. 3.4 Workpiece edge All workpiece edges produced by machining (mechanical processing) shall be deburred according DIN ISO 13715:2-12, see figure 1 and figure 2. -,1 -,3 Fig. 1 - Outer edge, Fig. 2 - Inner edge, free of burrs, removal -,1 -,3 transition up +,3 3.5 Hole centerline lerance in deep drilling In full drilling with rotating workpiece, a hole centerline lerance of 1 mm for 1 mm of drilling depth shall not be exceeded. When the workpiece is fixed and the drill rotates instead, twice the hole centerline lerance is permitted.

7 Page 7 SN 2-5: Threads Tolerances for metric ISO threads The following lerances apply metric ISO threads: Thread lerance class according DIN ISO 965-1: medium (m) Tolerance zone according DIN ISO 965-1: g for external thread (bolt) Tolerance zone according DIN ISO 965-1: H for internal thread (nut) For parts shown on drawings, a drawing indication is made for thread sizes M Thread runout, thread undercut All thread runouts and thread undercuts shall be the normal design according DIN 76-1 and DIN Heat treatment Heat treatment required for reasons of manufacturing sequence (e.g. stresses resulting from machining) shall be made/arranged for by the executing workshop. 4 Inspection 4.1 Basic specification All features produced during the manufacturing processes (dimensions, surface roughness etc.) shall be examined by the manufacturing workshop. 4.2 Checking of dimensions, requirements for measuring equipment Every manufacturing shop shall make available sufficient measuring equipment for verification of the features produced. Measuring and inspection equipment shall be selected and used as appropriate for the respective measuring requirements and the measuring inaccuracies of the equipment shall be known. When necessary, proof shall be furnished of the fulfilment of the requirements concerning the control of measuring and test equipment as in DIN EN ISO 91:215-11, item on resources for moniring and measuring, and as in DIN EN ISO 112. Tolerances on shape and position shall be checked on calibrated 3-coordinate measuring machines. If the manufacturing shop has neither a 3-coordinate measuring machine nor comparable other measuring and testing equipment, SMS group reserves the right demand inspection of the workpiece by scanning on a machine ol in unclamped condition. This inspection shall be performed on a machine whose accuracy is known and which was not involved in the production of the workpiece. The accuracy of the machine shall be proved when required. Machine errors shall be eliminated; if this is not possible, they shall be taken in account. Deviations from these regulations require the previous approval by the SMS group department of quality inspection. 4.3 Inspection documentation When the criteria below apply, the manufacturing shop shall certify the results of its inspection in an inspection record stating the desired and the actual values. - Dimensional lerances with IT lerance class IT9; - Dimensional lerances without IT lerance class as shown in the following: Dimensions up 18 mm with lerance ranges,1 mm Dimensions > 18 8 mm with lerance ranges,2 mm Dimensions > 8 2 mm with lerance ranges,4 mm Dimensions > 2 5 mm with lerance ranges,8 mm Dimensions > 5 mm with lerance ranges 1, mm - Check-dimensions according DIN All lerances on shape and position indicated in the manufacturing documents; - Angles, curves and radii, small degree of accuracy m according DIN ISO :1991-6; - surface roughness values R a,8 µm according DIN ISO 132:22-6; - Pressure testing shall be documented according the specified type of testing, test pressure, test time, pressure fluids; - Threads, except for metrical (normal) vee threads and pipe threads, with indication of testing method/means. - Toothings, stating base tangent lengths, oth form, oth alignment, pitch. - Surface treatments and coats with indication of hardness and coat thickness. - External condition, e.g. surface examination using penetrant testing or magnetic particle testing; - Internal condition using ultrasonic testing.

8 Page 8 SN 2-5: Tolerances and limit deviations for linear dimensions from 1 1, mm Application The following lerances apply all linear dimensions like lengths, widths, heights, depths, diameters etc. For the purpose of lerancing, the linear dimensions over 1 up 1, mm nominal dimension are subdivided in 12 different lerance classes, which shall be selected and agreed upon as required for the respective application. The standard lerances stated in table 12 are assigned the respective lerance series and classes. The values are based on the reference temperature of 2 C according DIN EN ISO 1: Designation of the lerance series The composition of the lerance series designation is shown in figure 3. Tolerance series Tolerance series DIN ISO 286- IT... (up 315 mm) DIN IT... (over 315 mm) Designation Main DIN number Abbreviation IT and lerance class (IT = international lerance grade) Standard lerances Figure 3 Designation of the lerance series The values of the lerance zones for the standard lerances grades IT5 IT16 are listed in Table 12. Table 12 Standard lerances Nominal IT µm dimension range mm From > > > > > > > > > > > > > > > > > > > > ,5 > > > > >

9 Page 9 SN 2-5: Limit dimensions for external and internal dimensions in the nominal dimension range up 315 mm The lerance zones for the nominal dimension range up 315 mm according DIN EN ISO 286-2:21-11 are a selection of SMS group and are specified in table 13 for external dimensions and in table 14 for internal dimensions. Nominal dim. range mm Table 13 Tolerance zones for external dimensions up 315 mm Deviations (µm) e7 e8 e9 f7 g6 h6 h9 h11 j6/js6 a) k6 m6 n6 p6 r6 s6 > > > > > > > 5 65 > 65 8 > 8 1 > 1 12 > > > > 18 2 > > > > > > > 4 45 > 45 5 > 5 56 > > > 71 8 > 8 9 > 9 1 > > > > > > 18 2 > > > > a) js6 applies over nominal dimension range

10 Page 1 SN 2-5:216-5 Nominal dim. range mm > 1 3 > 3 6 > 6 1 > 1 18 > 18 3 > 3 5 > 5 65 > 65 8 Table 14 Tolerance zones for internal dimensions up 315 mm Deviations (µm) D7 D1 E9 F7 F8 G7 G8 H7 H8 H9 H12 H13 J7/JS7 a) K7 M7 P > 8 1 > > > > > 18 2 > > > > > > > 4 45 > > 5 56 > > > > 8 9 > > > > > > > > > > > a) JS7 applies over nominal dimension range 5

11 Page 11 SN 2-5: Limit deviations for external and internal dimensions in the nominal dimension range from 315 mm 1, mm The lerance zones for the nominal dimension range from 315 mm 1, mm according DIN 7172: are a selection of SMS group and are specified in Table 15 for external dimensions and in Table 16 for internal dimensions. Table 15 Tolerance zones for external dimensions from 315 mm 1, mm Nominal dim. range mm > > 4 5 > 5 63 > 63 8 > 8 1, Deviations (µm) e7 e8 e9 f7 g6 h6 h9 h11 js6 k6 m6 n6 p Table 16 Tolerance zones for internal dimensions from 315 mm 1, mm Nominal dim. range mm Deviations (µm) D7 D1 E9 F7 F8 G7 H7 H8 H9 H12 H13 JS7 K7 M7 > > 4 5 > 5 63 > > 8 1,

12 Page 12 SN 2-5:216-5 Annex A (for information) Representation on drawings A.1 Basic specifications Drawing indication of the surface quality shall be made according DIN EN ISO 132:22-6. The tables A.1 and A.2 show juxtapositions of the symbols according DIN EN ISO 132:22-6 and DIN ISO 132: (withdrawn). In the drawings SMS group indicates the centerline average roughness R a as preferred measured variable. A.2 Symbols A.2.1 Positions of the surface indications at the symbol The tables A.1 and A.2 show juxtapositions of the symbols according DIN EN ISO 132:22-6 and DIN ISO 132: (withdrawn). Symbol according DIN EN ISO 132:22-6 Table A.1 Surface indications Symbol according Meaning DIN ISO 132: (withdrawn) a = roughness value R a in µm b = surface condition requirements c = manufacturing process d = surface grooves and direction e = machining allowance f = other measured roughness variables e.g. R z1max, R amax Meaning a = roughness value R a in µm b = manufacturing process, surface treatment c = reference length d = groove direction e = machining allowance f = other measured roughness variables e.g. R z, R max Explanation SMS group standard indication Indications shall be made only if indispensable for functional reasons A.2.2 Surface quality indication at the symbol Symbols used for surface quality indication are shown in table A.2. The use of summarising symbols shall be avoided. Symbol according DIN EN ISO 132:22-6 Table A.2 Surface quality Symbol according DIN ISO 132: (withdrawn) Meaning Basic symbol. Additional information is required for clear definition. The surface is allowed be produced by any manufacturing process within the specified centerline average roughness R a 3,2 µm. The surface shall be produced by a metal-cutting process (machining); no specification of center line average roughness. The surface shall be produced by a metal-cutting (machining) process within the specified centerline average roughness R a 3,2 µm. Extended graphical symbol: Surface on which metal-cutting working is not allowed. This symbol can also be used on drawings intended for a particular work step show that a surface shall be left in the condition produced in the preceding work step no matter whether this condition was produced by machining or in a different way.

13 Page 13 SN 2-5:216-5 A.2.3 Symbols for indication of the surface grooves The surface grooves and the groove direction produced by the machining process (e.g. traces left by ols) are shown in table A.3. Table A.3 Surface grooves Symbol Explanation Graphical representation Grooves parallel the plane of projection of the view in which the symbol is used. Groove direction Grooves perpendicular the plane of projection of the view in which the symbol is used. Groove direction Grooves crossed in two oblique directions relative the plane of projection of the view in which the symbol is used. Groove direction Multidirectional grooves. Grooves approximately centric relative the center of the surface which the symbol refers. Grooves approximately radial relative the center of the surface which the symbol refers. A.2.4 Symbols for mechanical processing The indication of machining be made before or after welding and the indication of free choice of ol are SMS group specific stipulations; the symbols used here are shown in table A.4. Symbol Table A.4 Mechanical processing Explanation Example of drawing indication Machining be made after welding on. Machining be made before welding on. Free choice of ol (refer A.3).

14 Page 14 SN 2-5:216-5 A.3 Free choice of ol As an SMS group specific regulation, curvatures, chamfers, keyways, bore mouths and end faces of recesses can be produced as required for the ol conur as explained in table A.5. The drawing indication shall be made as shown in the examples below. Design Curvatures and chamfers on turned and milled parts Possible ol conurs: Table A.5 Free choice of ol Necessary drawing indications or except for example 5 Example 1 Example 2 Example 3 Example 4 (with indication of functional dimensions) or or Example 5 Example 6 Example 7 Example 8 Drilling ol runout The following drilling ol runouts are possible:. Example 9 Example 1 Example 11 End faces of recesses Milling of a joint recess area for several individual recesses is allowed. The following end faces are possible: Ra 3,2 or Example 12 Choice of drilling ol for stepped holes Unless indicated in detail in the drawings, the manufacturer is free choose the drilling ol for the production of stepped (or smooth) holes depending on which drilling ol is available. G 3/4x16 / 11 22x12 or G 3/4x16 / 11 22x12

15 Page 15 SN 2-5:216-5 A.4 Tolerances on shape and position A.4.1 Basic specifications The lerances on shape and position (orientation, location and runout) according DIN EN ISO 111:214-4 are specified on the basis of the functional requirements. Tolerances on shape and position may also be influenced by manufacturing and inspection requirements. A.4.2 Tolerance frame The requirements shall be indicated in a rectangular frame consisting of two or more compartments as shown in figures A.1 A.3. When a lerance applies more than one element, this shall be indicated above the lerance frame by the number of elements followed by "x", see figure A.2. Indication arrow Toleranced element Reference letter Tolerance value (t) Tolerance type symbol Fig. A.1 Position lerance frame Fig. A.2 Shape lerance frame Fig. A.3 Elements of the lerance frame for two or more elements A.4.3 Tolerance zone The lerance zone is a space which is limited by one or more lines or surfaces of theoretically exact geometrical form and characterised by a linear dimension, called the lerance. Unless otherwise specified, the width of the lerance zone is applied perpendicular the specified geometrical shape of the component. Depending on the feature be leranced and the kind of dimensioning used, the lerance zone can be - the space within a circle; - the space between two concentric circles; - the space between two equidistant lines or two parallel straight lines; - the space within a cylinder; - the space between two coaxial cylinders; - the space between two equidistant surfaces or two parallel planes; - the space within a sphere. A.4.4 Tolerance zone and CZ indication When a lerance zone is applied two or more individual elements, this requirement shall be indicated by adding CZ (for common zone) in the lerance frame after the lerance value. In the example shown in figure A.4, all three surfaces are required lie within a common lerance zone. Given this requirement, they are also symmetrical each other within the lerance of,1 mm. A.4.5 References Figure A.4 Common zone A reference constituted by a single element shall be indicated by a capital letter in a reference frame, see figure A.5. The same letter which is used identify the reference shall be shown in the lerance frame, see figure A.3. Reference letter Reference triangle Reference element Fig. A.5 Indication of a reference

16 Page 16 SN 2-5:216-5 A Reference triangles The reference triangle with the reference letter is shown as extension of the dimension line if reference is made the centerline or the central plane, see figures A.6 A.8. If there is not sufficient space for two dimension arrows, one of the arrows can be replaced with the reference triangle. Fig. A.6 Ref. triangle - Example A Fig. A.7 Ref. triangle Example - B Fig. A.8 Ref. triangle - Example C A Common references A common reference consisting of two elements shall be indicated with two capital letters separated by a horizontal line, see figure A.9. Figure A.9 Common reference A Multiple references When the reference system consists of two or three elements, i.e. when it has multiple references, the capital letters shall be indicated in separate compartments from left right by order of their importance, see figure A.1. Fig. A.1 Multiple reference A Restrictive specifications The lerance in figure A.11 refers the overall dimension of the element concerned. When the lerance applies only part lengths in any position, a linear dimension shall be indicated in addition the lerance value and separated from it by a stroke, see figure A.12. If the lerance applies a restricted part of the element, the restriction shall be shown as a wide dash-dot line and provided with dimensioning, see figure A.13. Fig. A.11 Tolerance Overall dimension Fig. A.12 Tolerance for partial lengths Fig. A.13 Tolerance for a limited area

17 Page 17 SN 2-5:216-5 A Tolerance zones of cylindrical or circular shape The lerance zone is of cylindrical or circular shape when the lerance value is preceded by the symbol "Ø", see figure A.14. When this symbol is not indicated, the lerance zone is delimited by two lines or surfaces whose distance in the direction of the indication arrow is equal the lerance value. Fig. A.14 Tolerance zone of cylindrical or circular shape A Theoretically exact dimensions When lerances on location, orientation or profile shape are specified for an element or a group of elements, the dimensions which define the theoretically exact location, orientation or the profile are called theoretically exact dimensions, see figure A.15. Theoretically exact dimensions shall not be leranced. These dimensions shall be shown in a box. Fig. A.15 Theoretically exact dimension A Geometrical elements The form and location lerance of a geometrical element defines the zone within which this element shall be located. A geometrical element is a certain part of a workpiece, like a point, a line or a surface. These geometrical elements can be either physically existing complete surface geometry elements (e.g. outside cylinder surface) or derived geometrical elements (e.g. a centerline or center surface). A Toleranced elements The lerance frame shall be connected the leranced element by a leader line starting from one side of the frame. At the end of the leader line, an arrowhead shall be shown pointing the outline of the element or an extension of the outline (but with clear lateral offset from the dimension line) when the lerance refers the line or the surface itself, see figures A.16 and A.17. The leader line shall point against the dimension line if the lerance refers the centerline or the center, see figure A.18. Fig. A.16 Example A Fig. A.17 Example B Fig. A.18 Example C

18 Page 18 SN 2-5:216-5 A.5 Definition of the lerance zone and the drawing indication Table A.6 shows various shape and position lerances according DIN EN ISO 111:214-4 with their lerance zones, gives examples, and explains the relevant drawing indication. Table A.6 Shape and position lerances Symbol Tolerance zone definition Drawing indication and explanation Straightness lerance The lerance zone in the plane under consideration is limited by two parallel straight lines at distance t from each other and is valid only in the direction indicated. Any extracted (actual) line on the upper surface which is parallel the plane of projection in which the indication is shown shall lie between two parallel straight lines which are,1 apart Flatness lerance a = any distance The lerance zone is limited by two parallel planes at distance t from each other. The extracted (actual) surface shall lie between two parallel planes which are,8 apart. Roundness lerance The lerance zone in the cross-section under consideration is limited by two concentric circles at radial distance t. The extracted (actual) circumferential line shall in every cross-section be located perpendicular the axis of the conical faces between two concentric circles lying in the same plane and having the radius difference,1. NOTE: The definition of the circumferential line has not been standardised. Cylindricity lerance a) Cross-sections The lerance zone is limited by two coaxial cylinders with a radius difference of t. The extracted (actual) outside cylinder surface shall lie between two coaxial cylinders at a radial distance of,1. Profile lerance of a line without reference The lerance zone is limited by two lines enveloping circles of diameter t and the centers of which are located on the line of the theoretically exact shape In every section parallel the plane of projection in which the indication is shown, the extracted (actual) profile line shall lie between two equidistant lines which envelope circles of diameter,4 whose centers are located on a line of theoretically exact geometrical shape. a) Any distance b) Plane perpendicular the drawing plane

19 Page 19 SN 2-5:216-5 Table A.6 Shape and position lerances (continued) Symbol Tolerance zone definition Drawing indication and explanation Profile lerance of a surface related a reference The lerance zone is limited by two planes enveloping spheres of diameter t and the centers of which are located on the face of the theoretically exact shape relative reference plane A. The extracted (actual) surface shall lie between two equidistant faces enveloping spheres of diameter,1 whose centers are located on the face with the theoretically exact shape relative reference plane A. a) Reference A Parallelism lerance of a line relative a reference line The lerance zone is limited by a cylinder of diameter t which is parallel the reference when the lerance value is preceded by the sign. The extracted (actual) median line shall be located within a cylindrical lerance zone of diameter,3 which is parallel reference straight line A. a) Reference A Parallelism lerance of a surface relative a reference surface The lerance zone is limited by two planes a distance t apart and parallel the reference plane. The extracted (actual) surface shall lie between two planes of distance,1 parallel reference plane D. Perpendicularity lerance of a surface relative a reference surface a) Reference D The lerance zone is limited by two parallel planes a distance t apart and perpendicular the reference. The extracted (actual) surface shall lie between two parallel planes of distance,8 which are perpendicular reference plane A. Angularity lerance of a surface relative a reference surface a) Reference A The lerance zone is limited by two planes a distance t apart and inclined the reference at the specified angle. The extracted (actual) surface shall lie between two parallel planes,8 apart and inclined relative reference plane A at the theoretically exact angle of 4. a) Reference A

20 Page 2 SN 2-5:216-5 Table A.6 Shape and position lerances (continued) Symbol Tolerance zone definition Drawing indication and explanation Position lerance of a line The lerance zone is limited by a cylinder of diameter t when the lerance value is preceded by the symbol. The axis of the lerance cylinder is determined by the theoretically exact dimensions for the references C, A and B. The extracted (actual) line shall lie within a cylindrical lerance zone of diameter,8 whose axis coincides with the theoretically exact location of the axis of the hole with respect the reference planes C, A and B. a) Reference A b) Reference B c) Reference C Coaxiality lerance of an axis The lerance zone is limited by a cylinder of diameter t, the lerance value shall be preceded by the symbol. The axis of the cylindrical lerance zone coincides with the reference axis. The extracted (actual) median line of the leranced cylinder shall lie within a cylindrical lerance zone of diameter,8 whose axis is the common reference axis A-B. The extracted (actual) median line of the leranced cylinder shall lie within a cylindrical lerance zone of diameter,1 whose axis is the reference axis A. a) Reference A-B Symmetry lerance of a median plane The lerance zone is limited by two planes a distance t apart and symmetrical the reference median plane. The extracted (actual) median surface shall lie between two parallel planes,8 apart which are symmetrical the reference median plane A. a) Reference Circular runout lerance - radial (radial runout lerance) The lerance zone is limited in every section by two concentric circles of radial distance t perpendicular the reference straight line and whose center coincides with the reference. The extracted (actual) line shall in every section lie perpendicular the common reference axis A-B between two concentric circles which are,1 apart and lie in the same plane. a) Reference b) Cross-section plane

21 Page 21 SN 2-5:216-5 Table A.6 Shape and position lerances (continued) Symbol Tolerance zone definition Drawing indication and explanation Circular runout lerance - axial (axial runout lerance) The lerance zone is limited in every cylindrical section whose axis coincides with the reference axis by two circles a distance t apart. The extracted (actual) line shall, in every cylindrical section whose axis coincides with reference straight line D, lie between two circles a distance of,1 apart. a) Reference D b) Tolerance zone c) Any diameter Total radial runout lerance The lerance zone is limited by two coaxial cylinders at radial distance t whose axes coincide with the reference. The extracted (actual) surface shall lie between two coaxial cylinders at a radial distance of,1 whose axes coincide with the common reference straight line A-B. a) Reference A-B Total axial runout lerance The lerance zone is limited by two parallel planes at distance t which are perpendicular the reference. The extracted (actual) surface shall lie between two parallel planes which are,1 apart and which are perpendicular reference straight line D. a) Reference D b) Extracted surface Annex B (for information) Surface roughness values Table B1 gives an overview of the surface roughness values.. The values in shaded spaces are SMS group standard and shall be used with preference. Table B.1 Surface roughness values Selection series and juxtaposition DIN ISO 132:22-6 R a µm R a µinch Roughness class R z µm 5 2 N N ,5 5 N ,3 25 N 9 4 3,2 125 N ,6 63 N 7 12,5,8 32 N 6 6,3,4 16 N 5 2,5,2 8 N 4 1,6,1 4 N 3 1

22 Page 22 SN 2-5:216-5 Referenced technical standards, codes and regulations DIN 76-1 Thread run-outs and thread undercuts - Part 1: For ISO metric threads in accordance with DIN 13-1 DIN 76-2 Runout and undercut for pipe thread according DIN ISO 228 Part 1 DIN 46-1 DIN DIN 7172: Technical drawings; Dimensioning; Definitions, general principles Technical drawings; Dimensioning; Rules for the application Tolerances and limit deviations for sizes above 315 up 1, mm; Principles, standard lerances, limit deviations DIN EN 124:25-1 DIN EN ISO 1:22-1 DIN EN ISO 111:214-4 DIN EN ISO 91:28-12 DIN EN ISO 112 DIN EN ISO 286-2: DIN ISO 965-1: DIN ISO 132: 22-6 DIN ISO : DIN ISO : DIN ISO 13715:2-12 Metallic products Types of inspection documents Geometrical product specification (GPS) Standard reference temperature for geometrical product specification and verification Geometrical product specifications (GPS); Geometrical lerancing; Tolerances of form, orientation, location and run-out Quality management systems - Requirements Measurement management systems Requirements for measurement processes and measuring equipment Geometric product specifications (GPS) - ISO code system for lerances on linear sizes - Part 2: Tables of standard lerance classes and limit deviations for holes and shafts ISO general purpose metric screw threads - Tolerances - Part 1: Principles and basic data Geometrical product specifications (GPS) - Indication of surface texture in technical product documentation General lerances; Tolerances for linear and angular dimensions without individual lerance indications General lerances - Geometrical lerances for features without individual lerance indications Technical drawings; Edges of undefined shape; Vocabulary and indications Revision of May 216 Edirial revision Title Section 1 Section 2 Section Section Section Section Section Section Section Section Changed from Machining Mechanical processing Change of Scope Normative references added Reference examples in text on linear dimensions added; Table 1: Footnote b) added Table 2: Footnote b) added Reference table 4 added; Reference drawing indication of angular lerance removed Reference drawing indication of angular lerance removed Reference drawing indication of shape and position lerance removed Roundness lerance specified No general lerances specified for cylindricity, profile line and profile face Adding of: There are no general lerances for position lerance except for hole center distances and hole circle diameters as in table 1. Table 1: Through-hole for mechanical engineering and steel construction changed Through-hole series coarse and Through-hole series fine according SN 48-2:215-9 Section 3.3 Table 11: Table heading: Symbol changed Standard surface quality and Explanation Application ; Bolt contact faces changed End faces for bolts and nuts; Surface symbols adapted DIN EN ISO 132:22-6

23 Page 23 SN 2-5:216-5 Revision of May 216 (continued) Section 3.4 Outer edge up,3 changed -,1 -,3; Section 3.7 Heat treatment added Section 3.5 Data for single-lip drill and ejecr drill removed Section 4.3 Inspection documentation for shape and position lerance altered; Inspection certificate 3.1 according DIN EN 124 changed Inspection record; Pressure testing >25 bar removed and replaced with.. according the specified type of Section Design instruction removed Annex A (for information) Adding of drawing indications in Annex A Section A.2 Surface symbols adapted DIN EN ISO 132:22-6 and juxtaposition of the symbols of DIN EN ISO 132: and DIN EN ISO 132:22-6 added Section A.2.3 Table A.3: Contents adapted DIN EN ISO 132:22-6 Section A.5 Table A.6: Contents adapted DIN EN ISO 111:214-4; Circular runout lerance - axial: Footnote a) Reference A changed Reference D Annex B (for information) Adding of Surface roughness values added in Annex B

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