1、BRITISH STANDARD BS EN ISO 128-20:2001 Incorporating Amendment No. 1 to BS ISO 128-20:1996 (renumbers the B S I S O a s BS EN ISO 128-20:2001) Technical drawings General principles of presentation Part 20: Basic conventions for lines The European Standard EN ISO 128-20:2001 has the status of a Briti
2、sh Standard ICS 01.100.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN ISO 128-20:2001 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Committee, was published under the authority of the Standards Committee o
3、n 15 January 2001 BSI 24 April 2002 ISBN 0 580 36233 7 National foreword This British Standard is the official English language version of EN ISO 128-20:2001. It is identical with ISO 128-20:1996. The UK participation in its preparation was entrusted to Technical Committee TDW/4, Engineering drawing
4、, metrology, precision measurement and all related documentation, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred
5、 to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a cont
6、ract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or pr
7、oposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii
8、and iii, a blank page, pages 1 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 13522 24 April 2002 Implementation of the European StandardEUROPEANST
9、ANDARD NORMEEUROPENNE EUROPISCHENORM ENISO12820 October2001 ICS01.100.01 Englishversion TechnicaldrawingsGeneralprinciplesofpresentationPart 20:Basicconventionsforlines(ISO12820:1996) DessinstechniquesPrincipesgnrauxdereprsentation Partie20:Conventionsdebasepourlestraits(ISO128 20:1996) ThisEuropean
10、StandardwasapprovedbyCENon30September2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtained
11、onapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENme
12、mbersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG
13、ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO12820:2001EINESO821:02(1002E) 2 Foreword ThetextoftheInternationalStandardfromTechnicalCommitteeISO/TC10“Technicaldrawings, productdefinitionandrel
14、ateddocumentation“oftheInternationalOrganizationforStandardization (ISO),thesecretariatofwhichisheldbyCMC. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofan identicaltextorbyendorsement,atthelatestbyApril2002,andconflictingnationalstandardsshallbe withdrawnatthelat
15、estbyApril2002. NOTEFROMCMC TheforewordissusceptibletobeamendedonreceptionoftheGermanlanguage version.Theconfirmedoramendedforeword,andwhenappropriate,thenormativeannexZAforthe referencestointernationalpublicationswiththeirrelevantEuropeanpublicationswillbecirculatedwith theGermanversion. Accordingt
16、otheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthe followingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic, Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands, Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnitedK
17、ingdom. ecitontnemesrodnE TxetehtforetnIehtradnatSlanoitanOSId821sah6991:02rppaneebybdevosaNECruEanaepo radnatSwdiynatuohtmfidoica.noit 2egaP ENISO12820:2001INTERNATIONAL STANDARD IS0 128-20 First edition 1996-11-15 Technical drawings - General principles of presentation - Part 20: Basic conventions
18、 for lines Dessins techniques - Principes g figure 2 b): a continuous and a dashed spaced line. a) b) Figure 2 b) Arranged next to each other. See figure3 for an example (two continuous lines either side of two dashed spaced lines). Figure 3 3.3.3 Arrangement of two continuous lines parallel to each
19、 other with regularly recurring connecting elements between them See figure4a) and b) for examples figure 4 a): blackened circular elements; figure 4 b): blackened trapezoidal elements. a) b) Figure 4 4 1002:02821OSINE4 ENISO12820:200140 0SI 0SI )E(6991:02=821 3.3.4 Arrangement of regularly recurrin
20、g geometric pictorial elements in association with continuous lines a) Without interruption of a continuous line. See figure 5 for examples. A I A I A A A A A I I I I I Figure 5 b) With interruption of a continuous line. See figure6 for examples. Figure 6 4 Line dimensions 4.1 Line width The width,
21、d, of all types of lines shall be one of the following depending on the type and size of the drawing. This series is based on a common ratio 1: II- 2 (z 1:1,4): 0,13 mm; 0,18 mm; 0,25 mm; 0,35 mm; 0,5 mm; 0,7 mm; 1 mm; I,4 mm; 2 mm The widths of extra wide, wide and narrow lines are in the ratio 4:2
22、:1. The line width of any one line shall be constant throughout the whole line. 4.2 Deviation in line width Line widths may deviate from those specified in 4.1 providing that it is possible to differentiate unambiguously between two adjacent lines with different widths. If drawing equipment which pr
23、oduces constant line width is used, the deviation in line width between two such lines shall not be greater than + 0,l d. - 1002:02821OSINE5 ENISO12820:200150SI )E(6991:02=821 4.3 Configuration of lines For the preparation of drawings by hand the lengths of line elements should conform to those of t
24、able3. Table 3 - Line element Line type No. Length Dots 04 to 07 and 10 to 15 0,5d Gaps 02 and 04 to 15 3d Short dashes 08 and 09 6d Dashes 02, 03 and 10 to 15 12d Long dashes 04 to 06, 08 and 09 24d Spaces 03 18d NOTE - The lengths shown in this table are valid for line elements with semi- circular
25、 and squared ends. In the case of line elements with semicircular ends, the length of the line element corresponds to the distance covered by a technical pen (with a tubular tip and using India ink) from the origin up to the end of the line element. The total length of such a line element is the sum
26、 of the length shown in table3 plus d. Formulae for the calculation of some of the basic types of line and line elements are given in IS0 128-21. The formulae are intended to facilitate the preparation of drawings using computer-aided design (CAD) systems. 5 Draughting of lines 5.1 Spacing The minim
27、um space between parallel lines should not be less than 0,7 mm, unless rules to the contrary are stated in other International Standards. NOTE 4 In certain cases when computer-aided drawing techniques are used, the spacing of lines on the drawing does not represent the actual spacing, e.g. for the r
28、epresentation of screw threads. This fact has to be considered when data sets are established, e.g. for the operation of machine tools. 1002:02821OSINE6 ENISO12820:200160 0SI 0SI )E(6991:02=821 5.2 Junctions 5.2.1 Types The basic types of lines, Nos. 02 to 06 and Nos. 08 to 15 should preferably meet
29、 at a dash; see figures 7 to 12. Figure 7 I I I - -I- - Figure 9 Figure 11 Figure 8 / H+ I I Figure 10 Figure 12 1002:02821OSINE7 ENISO12820:20017ISO 128=20:1996(E) 0 0SI Lines of basic type No. 07 should preferably meet at a dot, see figure 13. . . . . . . . . . . . l . . . . Figure 13 5.2.2 Representation The requirement of 5.2.1 shall be fulfilled by starting the lines at the junction (see figure 14) or by using a complete, or partial, cross formed by dashes (see figures 15 and 16). 12d Figure 15 Figure 14 Figure 16 8 1002:02821OSINE8 ENISO12820:20018
