INTERNATIONAL STANDARD Descriptors : screw threads, trapezoidal threads, specifications, profiles, dimensions, diameters, thread pitch.

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1 INTERNATIONAL STANDARD. 90 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXAYHAPOAHAfi OPrAHM3AUMR no TAHAAPTW3A~~W.ORGANISATION INTERNATIONALE DE NORMALISATION Dit document mag slechts op een stand-alone P worden geinstalleerd. Gebruik op een netwerk is alleen. toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone P. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. ISO metric trapezoidal Filetages m6triques trap6zoidaux ISO - Dimensions de base First edition orrected and reprinted screw threads - Basic dimensions UD Ref. No. ISO (E) Descriptors : screw threads, trapezoidal threads, specifications, profiles, dimensions, diameters, thread pitch. Price based on 6 pages

2 ISO (the International Organization fsr Standardization) is a wsrldwide federation sf national standards institutes (ISO member bedies). The work of deveioping ternatisnal Standards is carried out through ISO technical csrmnittees~ Every ember body interested in a subject fcir which a technicaf committee has been set up has the right to be represented on that committee International organizations, governmental and non-gowernmental, in Oiaissn vvith IIS d also take part in the work. Draft International Standards adspted by the technical csmmittees are eireulated to the member bodies for approval before their acceptance as %nternatior-a Standards by the 6SO ouneil. %nternational Standard fso 90 was developed by Technical ommittee BSOJB, S~WV threacds, and was circulated to the rnember bsdies in June 976. lt has been approved by the member bedies af the follswing muntries : Austria Belgium Brazil Kanada Denmark Finland France Germany Hungary India Ireland My Korea, Rep. of Mexico Netherlands New Zealand No rvasay Poland Romania South Africa, Rep. of Spain Sweden Switzerfand U.S.&. The mem ber bod ies docurment on tcchnica sf the following csuntries ex pressed disapprowai of the E gr ound s : Japan U.S.S.R. 0 6nkernational Organizatisn for Standardkation, Printed in Switzerland

3 INTERNATIONAL STANDARD ISO (E) ISO metric trapezoidal screw threads - Basic dimensions SOPE AND FIELD OF APPLIATION This International Standard specifies the basic dimensions for ISO metric trapezoidal screw threads according to ISO 90. The values refer to the basic profiles according to ISO 90. REFERENES ISO 90, /SO metric trapezoidal screw threads - Basic pro file and maximum material pro files. ISO 90, ISO metric trapezoidal screw threads - General plan. 3 ALULATION The values given in this International Standard have been calculated from the following formulae : Hl = P H =H, i-a = P + a, h3 =H, -t-a = P + a, z = P = H,/ D, =d-h,=d-p where Da =d-+a d3 =d-h, dz = D, =d-z=d-p ß, max. = a, ß, max. = a, ac = clearance on the crest = major diameter for internal threads D* = pitch diameter for internal threads D, = minor diameter for internal threads d = major diameter for external threads : nominal diameter dz = pitch diameter for external threads d, = minor diameter for external threads Hl = height of the overlapping Ha = height of internal threads h3 = height of external threads P = pitch

4 ISO (E) BASI PROFILES (modified) FIGURE TABLE - Basic dimensions for the thread Profile Dimensions in millimetres P a H,=h3 R, max. R, max. 3 03,,7 0,7, 0,08 0,3 0,3 6,,7 3,, 3 0,3 0, , 3,, 0, 6, IO

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