BS_5590-1978.pdf

BS5590:1978Cooperating organizationsThe Mechanical Engineering Standards Committee,under whose directionthis British Standard was prepared,consists of representatives from thefollowing Government departments and scientific and industrialorganizations:Associated Offices Technical CommitteeDepartment of Trade(Marine Division)Association of Consulting EngineersDepartment of TransportAssociation of Hydraulic EquipmentElectricity Supply Industry in EnglandManufacturersand WalesAssociation of Mining Electrical andEngineering Equipment UsersAssociationMechanical EngineersFederation of Manufacturers ofBritish Compressed Air SocietyConstruction Equipment and CranesBritish Electrical and Allied ManufacturersHealth and Safety ExecutiveAssociation(BEAMA)Institution of Gas EngineersBritish Gas CorporationInstitution of Mechanical EngineersBritish Gear ManufacturersAssociationInstitution of Plant EngineersBritish Internal Combustion EngineInstitution of Production Engineers*ManufacturersAssociationLondon Transport ExecutiveBritish Pump ManufacturersAssociationMachine Tool Trades AssociationBritish Steel CorporationMinistry of Defence*British Steel IndustryNational Coal BoardChartered Institution of Building ServicesProcess Plant AssociationCrown Agents for Oversea Governments andRailway Industry Association ofAdministrationsGreat BritainDepartment of the EnvironmentSociety of Motor Manufacturers andDepartment of IndustryTraders Limited(Mechanical Engineering)Telecommunication EngineeringDepartment of Industry(NationalManufacturing Association(TEMA)Engineering Laboratory)Water-tube BoilermakersAssociationThe organizations marked with an asterisk in the above list,together with thefollowing,were directly represented on the committee entrusted with thepreparation of this British Standard:euDepartment of Industry(National PhysicalGauge and Tool MakersAssociationLaboratory)Individual expertsDepartment of Industry(British CalibrationService)This British Standard,havingbeen prepared under thedirection of the MechanicalEngineering StandardsCommittee,was publishedunder the authority of theAmendments issued since publicationExecutive Board on31May1978Amd.No.Date of issueCommentsBSI07-19994033SeptemberIndicated by a sideline in the margin1982The following BSI referencesrelate to the work on thisstandard:Committee reference MEE/59Draft for comment 73/33654 DCISBN0580350878BS5590:1978ForewordThis British Standard for cylinders used in the determination of the pitchdiameter of external screw threads has been prepared under the direction of theMechanical Engineering Standards Committee.BS 3777 covering screw thread measuring cylinders was first issued in 1964.Atthat time,it was appropriate to give priority to cylinders for Unified andWhitworth thread forms and to use primarily imperial units.In addition,thelongstanding practice of using diameters of cylinders permitting measurementson a group of thread forms was continued although a more recent postwar facilityof using cylinders restricted closely to pitch line contact in a single thread formwas introduced as an alternative.Until metrication is complete,provision has to be continued for the measurementof pitch diameter of Unified,Whitworth and B.A.threads.Relevant informationconcerning measuring cylinders suitable for this purpose is given in Appendix CWith the issue of this standard,BS 3777:1964 is to be regarded as obsolete.A British Standard does not purport to include all the necessary provisions of acontract.Users of British Standards are responsible for their correct applicationCompliance with a British Standard does not of itself confer immunityfrom legal obligations.Summary of pagesThis document comprises a front cover,an inside front cover,pages i and ii,pages 1 to 8,an inside back cover and a back cover.This standard has been updated(see copyright date)and may have hadamendments incorporated.This will be indicated in the amendment table on theinside front cover.BSI07.1999