This British Standard implements the ISO system for technical product documentation and specification.<\/p>\n
The ISO system is defined in a large number of interlinked and related international standards which are referenced in this British Standard.<\/p>\n
The purpose of this British Standard is to facilitate the use of the ISO system by providing:<\/p>\n
an index to the international standards which make up the ISO system, referencing them according to their area of application;<\/p>\n<\/li>\n
key elements of the ISO standards to facilitate their application;<\/p>\n<\/li>\n
references to additional British and European Standards where they provide information or guidance over and above that provided by ISO standards; and<\/p>\n<\/li>\n
commentary and recommendations on the application of the standards where this is deemed useful.<\/p>\n<\/li>\n<\/ul>\n
The requirements refer to International and European Standards which have been implemented as British Standards, either in the BS EN, BS EN ISO, BS ISO series or as International Standards renumbered as British Standards.<\/p>\n
Annex A (normative) contains a list of normative references, indispensable for the application of this British Standard.<\/p>\n
Annex B (informative) contains a list of informative references.<\/p>\n
Annex C (informative) gives examples of geometrical tolerances and requirements associated with them.<\/p>\n
Annex D (normative) contains requirements for enhanced security.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | \t\tForeword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Section 1: Scope \t1.1\tScope \t1.2\tNormative references \t1.3\tTerms and definitions <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Section 2: Standards underpinning BS 8888 \t2.1\tGeneral <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Section 3: Symbols and abbreviations \t3.1\tSymbols and abbreviations <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Section 4: Principles of specification \t4.1\tGeneral principles of specification \t4.2\tDate of issue principle \t4.3\tReference condition principle <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | \t4.4\tInterpretation \t4.5\tDecimal principle \t4.6\tRigid workpiece principle <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | \t4.7\tRepresentation of features <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Section 5: Fundamental concepts \t5.1\tProperties \t5.2\tFeatures <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Figure 1\u2003Interrelationship of the geometrical feature definitions <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | \t5.3\tInterpretations of limits of size for a feature-of-size <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | \tFigure 2\tPossible interpretations of size limits where no form control is defined and the specification is incomplete <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Section 6: Dimensioning \t6.1\tDimensioning methods <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | \tFigure 3\tExample: expression of two deviations to the same number of decimal places \tFigure 4\tExample: expression of two limits of size to the same number of decimal places \tFigure 5\tExample: expression of deviations from dimensions displayed in accordance with BS EN ISO 286-1 \tFigure 6\tPositioning of dimensions <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | \tFigure 7\tArrangement and indication of dimensions internal and external features \tFigure 8\tGrouping of relative dimensions of features or objects in close proximity <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | \tFigure 9\tElements of dimensioning \tFigure 10\tDimension line of feature that is broken <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | \tFigure 11\tDimension lines of holes <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | \tFigure 12\tExtension lines \tFigure 13\tOblique extension lines \tFigure 14\tIntersection of projected contours of outlines <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | \tFigure 15\tIntersection of projected contours of transitions and similar features \tFigure 16\tExtension lines of angular dimensions <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | \tFigure 17\tPosition of dimensional values \tFigure 18\tPosition of dimensional values <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | \tFigure 19\tOrientation of linear dimensions \tFigure 20\tOrientation of angular dimensions <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | \tFigure 21\tComponents of a toleranced dimension \tFigure 22\tComponents of a toleranced dimension \tFigure 23\tComponents of a toleranced dimension <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | SameLvl \tFigure 24\tLimits of dimensions \tFigure 25\tSingle limit dimension \tFigure 26\tIndications of special dimensions: Radius <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | \tFigure 27\tIndications of special dimensions: Square \tFigure 28\tIndications of special dimensions: Spherical diameter \tFigure 29\tIndications of special dimensions: Spherical radius \tFigure 30\tIndications of special dimensions: Thickness <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | \tFigure 31\tDiameter and depth of counterbore \tFigure 32\tSize and angle of countersink <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | \tFigure 33\tNumber of equally-spaced features and the dimensional value \tFigure 34\tDimensioning of angular spacing \tFigure 35\tAngles of spacings <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | \tFigure 36\tIndication of features having the same dimensional value \tFigure 37\tIndication of features having the same dimensional value <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | \tFigure 38\tDimension of external chamfer not equal to 45\u00b0 \tFigure 39\tDimension of external chamfer equal to 45\u00b0 \tFigure 40\tDimension of internal chamfer not equal to 45\u00b0 <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | \tFigure 41\tDimension of internal chamfer equal to 45\u00b0 \tFigure 42\tDimension of countersink \tFigure 43\tDimension of countersink: simplification <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | \tFigure 44\tSymmetrical parts \tFigure 45\tSymmetrical parts <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | \tFigure 46\tSymmetrical parts \tFigure 47\tIndication of level on vertical view \tFigure 48\tIndication of level on horizontal view or section <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | \tFigure 49\tExample of curved feature defined by radii \tFigure 50\tExample of curved feature defined by radii <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | \tFigure 51\tCurved feature defined by coordinate dimensions \tFigure 52\tCurved features defined by coordinate dimensions <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | \tFigure 53\tExample of chain dimensioning \tFigure 54\tExample of parallel dimensioning <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | \tFigure 55\tExample of parallel dimensioning <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | \tFigure 56\tTwo dimension lines, inclined to each other, and two origins \tFigure 57\tRunning dimensioning of angles <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | \tFigure 58\tCartesian coordinate dimensioning <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | \t6.2\tDimensioning common features \tFigure 59\tCartesian coordinate dimensioning <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | \tFigure 60\tDimensioning of keyways <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | \t6.3\tTolerance dimensions <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Table 1\u2003Permissible deviations for linear dimensions except for broken edges Table 2\u2003Permissible deviations for broken edges (external radii and chamfer heights) Table 3\u2003Permissible deviations of angular dimensions <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | \t6.4\tEdges specification \tFigure 61\tUse of general tolerance notes <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | Table 4\u2003Examples of indication of edges <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | Section 7: Geometrical product specification \t7.1\tInterpretation and invocation principle \t7.2\tIndependency principle <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | \t7.3\tFeature principle \t7.4\tDefault principle \t7.5\tReference condition principle \t7.6\tRigid workpiece principle \t7.7\tDatums and datum systems <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | Figure 62\u2003Tolerance defining a datum system <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Figure 63\u2003Degrees of freedom <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | Figure 64\u2003Datum based on a planar datum feature <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | Figure 65\u2003Datum based on two parallel, opposed planes (external) <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | Figure 66\u2003Datum feature consisting of a non-ideal cylinder (external) <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | \tFigure 67\tDatum feature consisting of a non-ideal sphere (external) <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Figure 68\u2003Datum feature consisting of a non-ideal wedge <\/td>\n<\/tr>\n | ||||||
| 64<\/td>\n | \tFigure 69\tDatum feature consisting of a non-ideal cone <\/td>\n<\/tr>\n | ||||||
| 65<\/td>\n | Figure 70\u2003Datum feature consisting of a non-ideal complex surface <\/td>\n<\/tr>\n | ||||||
| 67<\/td>\n | Table 5\u2003Example: single datum <\/td>\n<\/tr>\n | ||||||
| 68<\/td>\n | Figure 71\u2003Common datum established from two coaxial cylinders <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | Table 6\u2003Examples: datum systems <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | Table 7\u2003Examples: datum systems <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | Figure 72\u2003Application of datum targets <\/td>\n<\/tr>\n | ||||||
| 72<\/td>\n | Figure 73\u2003Application of datum targets \tFigure 74\tSingle datum target frame \tFigure 75\tDatum target point <\/td>\n<\/tr>\n | ||||||
| 73<\/td>\n | \tFigure 76\tOpen datum target line \tFigure 77\tDatum target area \tFigure 78\tIndicator for single datum target point \tFigure 79\tIndicator for single datum target line <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | \tFigure 80\tIndicator for single datum target surface \tFigure 81\tIndicator for single datum target point \tFigure 82\tIndicator for single datum target point <\/td>\n<\/tr>\n | ||||||
| 75<\/td>\n | \tFigure 83\tIndication of datums established from datum targets \tFigure 84\tSimplification of drawing indication when there is only one datum target area <\/td>\n<\/tr>\n | ||||||
| 76<\/td>\n | Figure 85\u2003Datums based on more than one datum target <\/td>\n<\/tr>\n | ||||||
| 77<\/td>\n | Figure 86\u2003Application of \u201corientation-only\u201d modifier \tFigure 87\tIndication of which modifier is need in the set of situation features <\/td>\n<\/tr>\n | ||||||
| 78<\/td>\n | \t7.8\tGeometric tolerances <\/td>\n<\/tr>\n | ||||||
| 79<\/td>\n | \tTable 8\tSymbols for geometrical characteristics <\/td>\n<\/tr>\n | ||||||
| 80<\/td>\n | \tTable 9\tAdditional symbols <\/td>\n<\/tr>\n | ||||||
| 81<\/td>\n | \tFigure 88\tTolerance applying to more than one feature \tFigure 89\tIndications qualifying the form of the feature within the tolerance zone \tFigure 90\tRequirements given in tolerance frames one under the other <\/td>\n<\/tr>\n | ||||||
| 82<\/td>\n | \tFigure 91\tArrowhead terminating on the outline of the feature or as an extension \tFigure 92\tArrowhead terminating as an extension of the dimension line <\/td>\n<\/tr>\n | ||||||
| 83<\/td>\n | \tFigure 93\tWidth of tolerance zone applying to the specified geometry Figure 94\u2003With of tolerance zone, otherwise indicated <\/td>\n<\/tr>\n | ||||||
| 84<\/td>\n | \tFigure 95\tOrientation of the width of a positional tolerance zone \tFigure 96\tOrientation of the width of an orientation tolerance zone <\/td>\n<\/tr>\n | ||||||
| 85<\/td>\n | \tFigure 97\tTolerances perpendicular to each other \tFigure 98\tCylindrical and circular tolerance zones <\/td>\n<\/tr>\n | ||||||
| 86<\/td>\n | \tFigure 99\tTolerance zones applied to separate features \tFigure 100\tSingle tolerance zone applied to separate features <\/td>\n<\/tr>\n | ||||||
| 87<\/td>\n | \tFigure 101\tExamples of the use of the \u201call around\u201d symbol <\/td>\n<\/tr>\n | ||||||
| 88<\/td>\n | \tFigure 102\tExamples of \u201cMD\u201d and \u201cLD\u201d Figure 103\u2003Use of theoretically exact dimensions (TEDs) <\/td>\n<\/tr>\n | ||||||
| 89<\/td>\n | \tFigure 104\tExamples of tolerances of the same characteristic \tFigure 105\tTolerance applied to a restricted part of a feature <\/td>\n<\/tr>\n | ||||||
| 90<\/td>\n | \tFigure 106\tProjected tolerance zone \tFigure 107\tIndication of the maximum material requirement \tFigure 108\tIndication of the least material requirement <\/td>\n<\/tr>\n | ||||||
| 91<\/td>\n | \tFigure 109\tFree state condition \tFigure 110\tUse of several specification modifiers <\/td>\n<\/tr>\n | ||||||
| 92<\/td>\n | Section 8: Surface texture specification <\/td>\n<\/tr>\n | ||||||
| 94<\/td>\n | Section 9: Technical product documentation \t9.1\tGraphical representation and annotation of 3-D data (3-D modelling output) \t9.2\tDrawing sheets \tTable 10\tSizes of trimmed and untrimmed sheets and the drawing space\u2009A) <\/td>\n<\/tr>\n | ||||||
| 95<\/td>\n | \tFigure 111\tSize A4 to A0 <\/td>\n<\/tr>\n | ||||||
| 96<\/td>\n | \t9.3\tLine types and line widths \tTable 11\tNumber of fields Table 12\u2003Basic types <\/td>\n<\/tr>\n | ||||||
| 97<\/td>\n | \t9.4\tScales \tTable 13\tScales <\/td>\n<\/tr>\n | ||||||
| 98<\/td>\n | \t9.5\tLines \t9.6\tLettering <\/td>\n<\/tr>\n | ||||||
| 99<\/td>\n | \t9.7\tProjections <\/td>\n<\/tr>\n | ||||||
| 100<\/td>\n | \tFigure 112\tLabelled view method <\/td>\n<\/tr>\n | ||||||
| 101<\/td>\n | Figure 113\u2003First angle projection method \tFigure 114\tFirst angle projection method: Graphical symbol <\/td>\n<\/tr>\n | ||||||
| 102<\/td>\n | \t9.8\tViews Figure 115\u2003Third angle projection method \tFigure 116\tThird angle projection method: Graphical symbol <\/td>\n<\/tr>\n | ||||||
| 103<\/td>\n | \t9.9\tSections \tFigure 117\tAuxiliary view showing true shape of inclined surface <\/td>\n<\/tr>\n | ||||||
| 104<\/td>\n | \tFigure 118\tAuxiliary view showing true shape of inclined surface \tFigure 119\tAuxiliary view showing true shape of inclined surface <\/td>\n<\/tr>\n | ||||||
| 105<\/td>\n | \t9.10\tRepresentation of features \tFigure 120\tAuxiliary view showing true shape of inclined surface <\/td>\n<\/tr>\n | ||||||
| 106<\/td>\n | \t9.11\tRepresentation of components <\/td>\n<\/tr>\n | ||||||
| 108<\/td>\n | Section 10: Document handling \t10.1\tTypes of documentation \t10.2\tSecurity <\/td>\n<\/tr>\n | ||||||
| 109<\/td>\n | \t10.3\tStorage \t10.4\tMarking <\/td>\n<\/tr>\n | ||||||
| 110<\/td>\n | \t10.5\tProtection notices \tFigure 121\tBS 8888 independency system symbol \tFigure 122\tBS 8888 dependency system symbol <\/td>\n<\/tr>\n | ||||||
| 111<\/td>\n | \tAnnex A\tNormative references \n <\/td>\n<\/tr>\n | ||||||
| 116<\/td>\n | \tAnnex B\tBibliography <\/td>\n<\/tr>\n | ||||||
| 118<\/td>\n | \tAnnex C\tGeometrical tolerancing Table C.1\u2003Examples of geometrical tolerancing <\/td>\n<\/tr>\n | ||||||
| 125<\/td>\n | \tAnnex D\tDocument security \u2013 Enhanced <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Technical product documentation and specification<\/b><\/p>\n |