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1、 7 89 7 7 89 b in Table 1 footnote f the value of lg max has been corrected to 3 P c the test procedure in 5 1 has been updated d the designation has been modified e the standard has been editorially revised f screws made of non ferrous metals have been deleted g the angle of the bottom bearing face
2、 is now included h the minimum ultimate tensile load for stainless steel screws is now included i the range of commercial lengths of short screws has been extended to include size M 18 Previous editions DIN 7984 1961 03 1967 12 1970 12 1985 05 2002 12 3 DIN 7984 2009 06 1 Scope This standard specifi
3、es properties for sizes M 3 to M 24 hexagon socket head cap screws with low head of product grade A as in DIN EN ISO 4759 1 made of steel and stainless steel Where screws are to comply with specifications other than those given in this standard these shall be specified in accordance with the relevan
4、t standards e g DIN ISO 261 DIN ISO 965 2 DIN EN ISO 898 1 DIN EN ISO 3506 1 and DIN EN ISO 4759 1 Screws as specified in this standard cannot be used in the form of screw assemblies with captive washers as the associated components e g washers would require a smaller radius below the screw head whi
5、ch could seriously reduce the strength of the screw head NOTE Due to their head design screws as in this standard may not be capable of withstanding full loading see Clause 5 2 Normative references The following referenced documents are indispensable for the application of this document For dated re
6、ferences only the edition cited applies For undated references the latest edition of the referenced document including any amendments applies DIN 962 Designation system for fasteners DIN EN 20225 Fasteners Bolts screws studs and nuts Symbols and designations of dimensioning DIN EN 26157 1 Fasteners
7、Surface discontinuities Bolts screws and studs subject to general requirements DIN EN ISO 898 1 Mechanical properties of fasteners made of carbon steel and alloy steel Part 1 Bolts screws and studs with specified property classes Coarse thread and fine pitch thread DIN EN ISO 3269 Fasteners Acceptan
8、ce inspection DIN EN ISO 3506 1 Mechanical properties of corrosion resistant stainless steel fasteners Part 1 Bolts screws and studs DIN EN ISO 4042 Fasteners Electroplated coatings DIN EN ISO 4753 Fasteners Ends of parts with external ISO metric thread DIN EN ISO 4759 1 Tolerances for fasteners Par
9、t 1 Bolts screws studs and nuts Product grades A B and C DIN EN ISO 10664 Hexalobular internal driving feature for bolts and screws DIN EN ISO 10683 Fasteners Non electrolytically applied zinc flake coatings DIN ISO 261 ISO general purpose metric screw threads General plan DIN ISO 965 1 ISO general
10、purpose metric screw threads Tolerances Part 1 Principles and basic data DIN ISO 965 2 ISO general purpose metric screw threads Tolerances Part 2 Limits of sizes for general purpose external and internal screw threads Medium quality DIN ISO 8992 Fasteners General requirements for bolts screws studs
11、and nuts 4 DIN 7984 2009 06 3 Dimensions See Figure 1 and Table 1 Symbols and designations are given in DIN EN 20225 Dimensions in millimetres Key 1 end chamfered as in DIN EN ISO 4753 a length of incomplete thread u 2 P b slight rounding or countersinking at the mouth of the socket is permitted no
12、further than e c top edge of head rounded or chamfered at the discretion of the manufacturer d bottom edge of head may be rounded or chamfered to dw but shall always be free of burrs e reference datum for dw f ds applies if values of ls min are specified Figure 1 Hexagon socket head cap screw with l
13、ow head notation Maximum underhead fillet lf max 1 7 rmax 2 max s max a max dd r See Table 1 for rmin 5 DIN 7984 2009 06 Table 1 Dimensions Dimensions in millimetres Thread d M 3 M 4 M 5 M 6 M 8 M 10 Pa 0 5 0 7 0 8 1 1 25 1 5 l 125 12 14 16 18 22 26 125 200 da max 3 6 4 7 5 7 6 8 9 2 11 2 max nomina
14、l size dk 5 5 7 8 5 10 13 16 dk min 5 32 6 78 8 28 9 78 12 73 15 73 max nominal size ds 3 4 5 6 8 10 ds min 2 86 3 82 4 82 5 82 7 78 9 78 dw min 4 84 6 2 7 7 9 2 12 03 15 03 eb min 2 3 2 87 3 44 4 58 5 72 8 01 lf max 0 51 0 6 0 6 0 68 1 02 1 02 max nominal size k 2 2 8 3 5 4 5 6 k min 1 86 2 66 3 32
15、 3 82 4 82 5 82 r min 0 1 0 2 0 2 0 25 0 4 0 4 nominal size 2 2 5 3 4 5 7 min 2 02 2 52 3 02 4 02 5 02 7 025 s max 2 10 2 60 3 10 4 12 5 14 7 175 nominal size 1 5 2 3 2 7 3 3 8 4 5 min 1 38 2 18 2 58 2 88 3 65 4 35 t max 1 62 2 42 2 82 3 12 3 95 4 65 v max 0 3 0 4 0 5 0 6 0 8 1 lc Shank length ls lg
16、 ls lg ls lg ls lg ls lg ls lg Nominal length min max min max min max min max min max min max min max 5 4 76 5 24 1 5 6 5 76 6 24 1 5 2 1 8 7 71 8 29 1 5 2 1 2 4 10 9 71 10 29 1 5 2 1 2 4 3 12 11 65 12 35 1 5 2 1 2 4 3 3 75 14 13 65 14 35 1 5 2 1 2 4 3 3 75 16 15 65 16 35 1 5 2 1 2 4 3 3 75 4 5 18 17 65 18 35 1 5 2 1 2 4 3 3 75 4 5 20 19 58 20 42 5 5 8 2 1 2 4 3 3 75 4 5 25 24 58 25 42 7 5 11 2 4 3 3 75 4 5 30 29 58 30 42 10 14 0 7 12 3 75 4 5 35 34 5 35 5 12 17 6 75 13 4 5 40 39 5 40 5 17 22 11
