ISO INTERNATIONAL STANDARD 4028 Third edition 2003-12-01 Hexagon socket set screws with dog point Vis sansteteasixpans creux,ateton Reference number ISO 4028:2003(E) ISO ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies non-governmental, in liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (IEC)on all matters of electrotechnical standardization. adopted by the technical committees are circulated to the member bodies for voting. Publication as an Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO4028waspreparedbyTechnicalCommitteeISO/TC2,Fasteners. This third edition cancels and replaces the second edition (IsO 4028:1993), which has been technically revised. ii blank Hexagon socket set screws with dog point 1 Scope This International Standard specifies the characteristics of hexagon socket set screws with dog point and If, in special cases, specifications other than those listed in this International Standard are required, they should be selected from existingInternational Standards,e.g.ISO261,ISO898-5,ISO965-2,ISO3506-3and ISO4759-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references,the latest edition of the referenced document (including any amendments) applies. ISO225,Fasteners-Bolts,screws,studsandnutsSymbolsanddesignationsofdimensions IsO261,ISOgeneral-purposemetric screwthreads-Generalplan Iso 898-5,Mechanical properties offasteners made of carbon steel and alloy steel-Part 5: Set screws and similarthreadedfastenersnotundertensilestresses ISO965-2,IsOgeneralpurposemetric screwthreads-Tolerances-Part2:Limitsofsizesforgeneral purposeexternaland internalscrewthreadsMediumquality ISO965-3,sO general purposemetric screw threads-Tolerances-Part 3:Deviationsfor constructional screwthreads IsO3269,FastenersAcceptanceinspection IsO3506-3,Mechanicalpropertiesofcorrosion-resistantstainless-steelfasteners-Part3:Set screwsand similarfasteners notundertensile stress IsO4042,Fasteners—Electroplatedcoatings ISO4759-1,Tolerancesforfasteners—Part1:Bolts,screws,studsandnuts—ProductgradesA,BandC Iso6157-1,Fasteners-Surface discontinuities-Part 1:Bolts, screws and studs forgeneral requirements Iso8839,Mechanicalpropertiesoffasteners-Bolts,screws,studsandnutsmadeofnon-ferrousmetals Iso8992,FastenersGeneral requirementsforbolts,screws,studsandnuts Iso10683,FastenersNon-electrolyticallyappliedzincflakecoatings IsO23429,Gaugingofhexagonsockets 1 3Dimensions See Figure 1 and Table 1. Symbols and designations of dimensions are specified in IsO 225. 120°a 90. Permissiblealternativeformofsocket Forbroachedsocketswhichareatthemaximum limit e/2 of size, the overcut resulting from drilling shall not exceed 1/3 of the length of any flat of the socket which (e/2)/3 is e/2. a The 120° angle is a requirement for short-length screws of nominal length, I, situated in the shaded areas in Table 1. c Incomplete thread u < 2P d A slight radius. e A slight rounding or countersink at the mouth of the socket is permissible. Figure 1 2 Table 1 — Dimensions Dimensions in millimetres Thread (d) M1,6 M2,5 M3 M8 M10 M16 M20 M2 M4 M5 M6 M12 M24 pa 0,35 0,4 0,45 0,5 0,7 0,8 1 1,25 1,5 1,75 2 2,5 3 0,80 1,00 1,50 2,00 2,50 3,5 4,0 5,5 7,00 max. 8,50 12,00 15,00 18,00 dp 1,25 min. 0,55 0,75 1,75 2,25 3,2 3,7 5,2 6,64 8,14 11,57 14,57 17,57 di ~ Minor thread d min. diameter min. 0,809 1,011 1,454 1,733 2,303 2,873 3,443 4,583 5,723 6,863 9,149 11,429 13,716 nom. 0,7 0,9 1,3 1,5 2 2,5 3 4 5 6 8 10 12 sc max. 0,724 0,913 1,300 1,58 2,08 2,58 3,08 4,095 5,14 6,14 8,175 10,175 12,212 0,710 1,275 1,52 2,02 2,52 3,02 4,020 5,02 6,02 min. 0,887 8,025 1