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INTERNATIONALSTANDARDINTERNATIONALORGANIZATIONFOR STANDARDIZATIONl MEXAYHAPOAHAIIOPI-AHM3ALUUIl-IO CTAHAAPTki3ALUW.ORGANISATlONINTERNATIONALEDE NORMALISATIONGround thread taps for IS0 metric threads of tolerances 4Hto 8H and 4G to 6G coarse and fine pitches - Manufacturingtolerances on the threaded portionThis is a free 5 page sample. Access the full version online.First edition - 1973-12-01Ref. No. IS0 28574973UDC 621.993Descriptors: tools,taps, screw threads,dimensionaltolerancesPrice based on 13www.standards.com.au(E)Copyright ISOpageswww.isostandards.com.au
IS0 (the InternationalOrganizationfor Standardization)is a worldwidefederationof nationalstandardsinstitutes(IS0 MemberBodies). The work of developingInternationalStandardsis carried out throughIS0 TechnicalCommittees.EveryMember Body interestedin a subject for which a Technical Committeehas been setup has the right to be representedon that nd non-governmental,in liaison with ISO, also take part in the work.Draft InternationalStandardsto the MemberBodies forStandards by the IS0 Council.adoptedapprovalby the TechnicalCommitteesare circulatedbeforetheir acceptanceas InternationalInternationalStandardIS0 2857was drawnup by TechnicalISO/TC 29, Small too/s, and circulated to the Member Bodies in AugustIt has been approvedby the MemberAustriaBelgiumChileCzechoslovakiaEgypt, Arab Rep. ofFranceGermanyThis is a free 5 page sample. Access the full version online.The MemberBodiesdocumenton technicalBodies of the followingIndiaIrelandIsraelItalyNetherlandsNew ZealandPolandof the followinggrounds :countriesCommittee1972.:RomaniaSouth Africa, Rep. ofSwitzerlandThailandTurkeyUnited ernationalPrintedOrganizationfor Standardization,1973lin Switzerlandwww.standards.com.auCopyright ISOwww.isostandards.com.au
CONTENTSPage1Scope and field of application. . . . . . . . . . . . . . . . . . . . . . .12References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Basic data.13.1Threadprofileof nuts.13.2Threadprofileof eson tap threads4.1Major diameterd4.2Pitch r5Designation6Example.4.5of tap dlerrorand markingof calculation4.6on the angle cy and half angle a/2 of threadpitch3of classes 1, 2 and 3 .of tap threadManufacturing2.classes of tapsTr, over any numberof taps6.of threads6. . . . . . . . . . . . . . . . . . . . . .of the dimensionsof the threadedportionof a tap .67AnnexesGroundthreadtaps for IS0 metricthreadsof coarse pitchB-Groundthreadtaps for IS0 metricthreadsof fine pitch. . . . . . .8. . . . . . . .10This is a free 5 page sample. Access the full version online.A-www.standards.com.auCopyright ISOwww.isostandards.com.au
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INTERNATIONALSTANDARDIS0 28574973(E)Ground thread taps for IS0 metric threads of tolerances 4Hto 8H and 4G to 6G coarse and fine pitches - Manufacturingtolerances on the threaded portion 1SCOPE ANDFIELDOF APPLICATION2This InternationalStandardspecifies the manufacturingtoleranceson the threadedportionof taps for producingthe IS0 metric threads of toleranceclasses 4H to 8Hand 4G to 6G as defined in ISO/R 965/l to Ill (excluding,classes 7G and 8G consideredas usuallyconsequently,produced with ground thread taps).REFERENCESlSO/R529,Short machine taps and hand taps.ISO/R 724, IS0 general purpose metricBasic dimensions.screw threads -It is valid for the short taps specified in lSO/R 529 as wellas for any other kind of ground thread taps with the samediameters and pitches.lSO/R 965/l,/SO general purpose metric screw threads Tolerances - Principles and basic data.Theinternalthreadsproducedwiththosetaps areconventionallydesignatedby the simplifieddenominationof “nut”in agreement with the word used in lSO/R 965 forthe general designationof all internal threads.I SO/ R 9651 I I, /SO general purpose metric screw threads Tolerances - Limits of sizes for commercial bolt and nutthreads - Medium quality.Annexes A and B give, for all threads with coarse and finepitches,the manufacturingtoleranceson the threadedportion of taps for the followingclasses of nuts :34H and 5H - 6H - 7H and 8HandISO/R 965/l I I, /SO general purpose metric screw threads Tolerances - Deviations for constructional threads.3.14G and 5G - 6GBASICDATAThreadprofileof nuts : see figure1.rD nominaldiameterThis is a free 5 page sample. Access the full version online.Dl basic minor02.\diameter pitch diameterP pitch of threadBasic4profilea! includedangle of threadH height of fundamentaltriangleiEl minimum clearance,H deviation positivedeviationThTo2FIGUREwww.standards.com.au minordiameter pitch diameterzero forfor Gtolerancetolerance1Copyright ISOwww.isostandards.com.au
This is a free 5 page sample. Access the full version online.ISO 2857:1973 Ground thread taps for ISO metric threads oftolerances 4H to 8H and 4G to 6G coarse and fine pitches Manufacturing tolerances on the threaded portionThe remainder of this documentis available for purchase online atwww.saiglobal.com/shopSAI Global also carries a wide range of publications from a wide variety of Standards Publishers:Click on the logos to search the database online.
the IS0 metric threads of tolerance classes 4H to 8H and 4G to 6G as defined in ISO/R 965/l to Ill (excluding, consequently, classes 7G and 8G considered as usually produced with ground thread taps). It is valid for the short taps specified in lSO/R 529 as well as for any other kind of ground thread taps with the same diameters and pitches. 2 REFERENCES lSO/R 529, Short machine taps and hand .
