德国螺丝标准ICS 21.060.10Zylinderschrauben mit Innensechskant –Niedriger Kopf, mit SchlüsselführungIn keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker.Ref.No.DIN 6912:2002-12English price group 07Sales No.010709.03DEUTSCHE NORM December 20026912{No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut für Normung e.V., Berlin. Beuth Verlag GmbH , 10772Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.Hexagon socket thin head cap screws withpilot recessContinued on pages 2 to 8.ForewordThis standard has been prepared by Technical Committee Schrauben m it Innenantrieb of the Normen-ausschuss Mechanische Verbindungselemente (Fasteners Standards Committee).The DIN 4000-2-1.2 tabular layout of article characteristics shall apply to screws covered in this standard.Amendments This standard differs from the May 1985 edition as follows:a)Hexagon socket head cap screws may now also be made of grade A4 stainless steel.b)For stainless steel screws, the range of sizes assigned to property class 70 has been changed.c)Minimum ultimate tensile loads have been specified.d)References have been updated.Previous editionsDIN 6912:1954x-03, 1967-12, 1985-05.All dimensions are in millimetres.1ScopeThis standard specifies dimensions and technical delivery conditions for sizes M4 to M36 hexagon sockethead cap screws with pilot recess, of product grade A and made of steel, stainless steel or nonferrous metal.Where screws are to comply with specifications other than those given in this standard, these shall be selected in accordance with the relevant standards (e.g. DIN EN 28839, DIN EN ISO 898-1,DIN EN ISO 3506-1, DIN EN ISO 4759-1, DIN ISO 261, and DIN ISO 965-2).Screws specified in this standard should not be used in the form of screw assemblies with captive washers as they are always required to have a short unthreaded portion of shank to compensate for the pilot recess.SupersedesMay 1985 edition.Page2DIN6912:2002-122Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. These norma-tive references are cited at the appropriate places in the text, and the titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies.DIN962Designation system for fastenersDIN4000-2Tabular layouts of article characteristics for bolts, screws and fit boltsDIN EN20225Bolts, screws, studs and nuts – Symbols and designations for dimensioning(ISO225:1983)DIN EN26157-3Fasteners – Surface discontinuities – Part3: Bolts, screws and studs for special require-ments (ISO6157-3:1988)DIN EN28839Mechanical properties of fasteners – Bolts, screws, studs and nuts made of non-ferrous metals (ISO8839:1986) DIN EN ISO898-1Mechanical properties of fasteners made of carbon steel and alloy steel – Part1: Bolts, screws and studs (ISO898-1:1999)DIN EN ISO3269Fasteners – Acceptance inspection (ISO3269:2000)DIN EN ISO3506-1Mechanical properties of corrosion-resistant stainless steel fasteners – Part1: Bolts, screws and studs (ISO3506-1:1997)DIN EN ISO4042Fasteners – Electroplated coatings (ISO4042:1999)DIN EN ISO4753Fasteners – Ends of parts with external ISO metric screw thread (ISO4753:1999)DIN EN ISO4759-1Tolerances for fasteners – Part1: Bolts, screws and nuts – Product grades A, B and C (ISO4759-1:2000) DIN EN ISO10683Fasteners – Non-electrolytically applied zinc flake coatings (ISO10683:2000)DIN ISO261ISO general purpose metric screw threads – General plan (ISO261:1998)DIN ISO965-2ISO general purpose metric screw threads – Tolerances – Part2: Limits of sizes for gen-eral purpose external and internal screw threads – Medium quality (ISO965-2:1998) ISO8992:1986Fasteners – General requirements for bolts, screws, studs and nutsPage 3DIN 6912:2002-123DimensionsScrew dimensions shall be as given in figure 1 and table 1.See DIN EN 20225 for symbols.Maximum underhead fillet l f max = 1,7 r maxd a,max –d s,max r max =2For r min , see table 1.Detail XKey to figure 1)End chamfered (cf. DIN EN ISO 4753).2)Length of incomplete thread, u : 2 P maximum.3)Slight rounding or countersinking at the mouth of the socket is permitted (no further than e ).4)Top edge of head rounded or chamfered (optional).5)Bottom edge of head may be rounded or chamfered to d w , but shall always be free from burr.6)Datum for d w .7)d s applies if values of l s min are specified.Figure 1:Screw dimensions (notation)1)2)7)3)6)5)4)XPage 4DIN 6912:2002-12Tabl e 1:Screw dimensionsThread size (d )Reference dimension2)3)4)Max. = nominal sizeMin. = nominal size Max. = nominal sizeMax. = nominal sizeNominal sizeNominal size1)5)6)Shank length, l s , and grip length, l gNominal sizeNOTE: Use of sizes in brackets should be avoided.1)Thread pitch.2)For lengths, l , of 125 mm or less.3)For lengths, l , above 125 mm up to 200 mm.4)For lengths, l , exceeding 200 mm.5)emin = 1,14 s min .6)Commercial sizes of screws are those for which lengths l s and l ghave been specified. Nominal lengths, l , exceeding200 mm shall be graded in 20 mm steps.For screws with lengths above the dashed line, the maximum distance between the last fully formed thread and the bearingface, l g , shall be equal to 5 P . For lengths below the line, l g and l s are to be calculated using the following equations:l g max = l nom – b ; l smin = l g max – 5 P .(continued)Page 5DIN 6912:2002-12Table 1(concluded)Thread size (d )Reference dimension2)3)4)Max. = nominal sizeMin. = nominal size Max. = nominal sizeMax. = nominal sizeNominal sizeNominal size1)5)6)Nominal sizeFor footnotes, see page 4.Shank length, l s , and grip length, l gPage 6DIN 6912:2002-12MaterialSteelStainless steel Nonferrous metalGeneral requirements As specified in ISO 8992.ThreadTolerance 6gAs specified in DIN ISO 261 and DIN ISO 965-2.For sizes up to Property class 1)8.8M24: A2-70 or CuZn 2)(material)A4-70; for larger sizes: A2-50.As specified inDIN EN ISO 898-1.DIN EN ISO 3506-1.DIN EN 28839.Product grade AAs specified inDIN EN ISO 4759-1.As processed.Plain PlainDIN EN ISO 4042DIN EN ISO 4042applies with regard applies with regard to electroplating.to electroplating.DIN EN ISO 10683applies with regard to zinc flake coatings.DIN EN 26157-3applies with regard to limits for surface discontinuities.Acceptance As specified in DIN EN ISO 3269.inspection1)See clause 5 for tensile strength requirements.2)CU2 or CU3 grade copper-zinc alloy, at the manufacturer’s discretion.4Technical delivery conditionsTable 2:Technical delivery conditionsMechanical propertiesLimit deviations and geometrical tolerancesSurface finishSurfacediscontinuities 5Reduced strength5.1Screws made of steel (other than stainless)When tested as specified in DIN EN ISO 898-1 (test programme B), steel screws covered by this standard may not fulfill the tensile strength requirements for property class 8.8. All other requirements shall be met.When testing full-size screws, the loads given in table 4 shall be applied. Any failure shall occur in the shank,along the free threaded length or at the head/shank transition.Page 7DIN6912:2002-12 Table3:Minimum ultimate tensile loads for steel screws of property class 8.8(equal to 80% of the loads required in DIN EN ISO898-1)Thread size (d)M4M5M6M8M10M12M14 Minimum ultimate tensile562090801290023400371005390073600 load, in N Thread size (d)M16M18M20M22M24M27M30 Minimum ultimatetensile100000127000162000202000234000309000373000 load, in NThread size (d)M33M36Minimum ultimate tensile461000542000load, in N5.2Stainless steel screwsIn the case of stainless steel screws, the tensile strength shall be equal to 80% of the values specified in DIN EN ISO3506-1.5.3Nonferrous metal screwsIn the case of nonferrous metal screws, the minimum breaking load shall be equal to 80% of the values specified in DINEN28839.6DesignationDesignation of an M12 hexagon socket thin head cap screw (M12) with pilot recess, with a nominal length, l, of 60 mm (60), of property class 8.8:Screw DIN6912 – M12 é 60 – 8.8See DIN962 for supplementary order designations for special screw types and finishes.Page 8DIN 6912:2002-12Annex AMass of steel screwsThread size (d )Nominal length, lApprox. mass, in kg, per 1 000 unitsM4M5M6M8M10M12M14M16M18M20M22M24M27M30M33M36Thread size (d )Nominal length, lApprox. mass, in kg, per 1 000 units 10121620253035405060708090100110120130140253035405060708090100110120130140150160170180190200 NOTE:The values of mass specified for the commercial sizes are for guidance only.。
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