1、June 2009 Translation by DIN-Sprachendienst.English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 21
2、.060.10!$lFv“1733583www.din.deDDIN 7984Hexagon socket head cap screws with low headEnglish translation of DIN 7984:2009-06Zylinderschrauben mit Innensechskant mit niedrigem KopfEnglische bersetzung von DIN 7984:2009-06Vis tte cylindrique six pans creux avec tte basseTraduction anglaise de DIN 7984:2
3、009-06SupersedesDIN 7984:2002-12www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1111.10 DIN 7984:2009-06 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Dimensions.5 4 Technical delivery conditions 8 5 Reduced strength
4、 8 5.1 Screws made of steel (other than stainless).8 5.2 Stainless steel screws.9 6 Designation 9 Annex A (informative) Mass of steel screws 10 Bibliography 11 2 DIN 7984:2009-06 Foreword This standard has been prepared by Working Committee NA 067-03-01 AA Verbindungselemente mit Auen-gewinde of the
5、 Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee). The DIN 4000-160-2 tabular layout of product properties shall apply to screws covered in this standard. Amendments This standard differs from DIN 7984:2002-12 as follows: a) normative references have been updated; b) i
6、n 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 is
7、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 s
8、pecifies 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 th
9、e relevant 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
10、 the screw head, which 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 t
11、his document. For dated references, 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 di
12、mensioning DIN EN 26157-1, Fasteners 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
13、thread DIN EN ISO 3269, Fasteners Acceptance 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
14、 DIN EN ISO 4759-1, Tolerances for fasteners Part 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 metri
15、c screw threads General plan DIN ISO 965-1, ISO general 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
16、8992, Fasteners General requirements for bolts, screws, studs 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 alength of incomplete thread, u 2 P bslight roundin
17、g or countersinking at the mouth of the socket is permitted (no further than e) ctop edge of head rounded or chamfered at the discretion of the manufacturer dbottom edge of head may be rounded or chamfered to dw, but shall always be free of burrs ereference datum for dw fdsapplies if values of ls,mi
18、n are specified. Figure 1 Hexagon socket head cap screw with low head (notation) Maximum underhead fillet lf max = 1,7 rmax2max s,max,amaxddr= 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 Pa0,5 0,7 0,8 1 1,25 1,5 l 12512 14 1
19、6 18 22 26 125 200 damax. 3,6 4,7 5,7 6,8 9,2 11,2 max. = nominal size dk5,5 7 8,5 10 13 16 dkmin. 5,32 6,78 8,28 9,78 12,73 15,73 max. = nominal size ds3 4 5 6 8 10 dsmin. 2,86 3,82 4,82 5,82 7,78 9,78 dwmin. 4,84 6,2 7,7 9,2 12,03 15,03 ebmin. 2,3 2,87 3,44 4,58 5,72 8,01 lfmax. 0,51 0,6 0,6 0,68
20、1,02 1,02 max. = nominal size k 2 2,8 3,5 4 5 6 k min. 1,86 2,66 3,32 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
21、2,42 2,82 3,12 3,95 4,65 v max. 0,3 0,4 0,5 0,6 0,8 1 lcShank length lslglslglslglslglslglslgNominal 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
22、(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 11,75 18 6,5 14 45 44,
23、5 45,5 16,75 23 11,5 19 50 49,5 50,5 21,75 28 16,5 24 (55) 54,4 55,6 26,75 33 21,5 29 60 59,4 60,6 31,75 38 26,5 34 70 69,4 70,6 41,75 48 36,5 44 80 79,4 80,6 51,75 58 46,5 54 90 89,3 90,7 56,5 64 100 99,3 100,7 66,5 74 6 DIN 7984:2009-06 Table 1 (continued) Dimensions in millimetres Thread d M 12 (
24、M 14) M 16 (M 18) M 20 (M 22) M 24 Pa1,75 2 2 2,5 2,5 2,5 3 l 12530 34 38 42 46 50 54 25 200 57 61 65 69 73 damax. 13,7 15,7 17,7 20,2 22,4 24,4 26,4 max. = nominal size dk18 21 24 27 30 33 36 dkmin. 17,73 20,67 23,67 26,67 29,67 32,61 35,61 max. = nominal size ds12 14 16 18 20 22 24 dsmin. 11,73 13
25、,73 15,73 17,73 19,67 21,67 23,67 dwmin. 17,03 19,83 22,83 25,83 28,83 31,61 34,61 eb min. 9,15 11,43 13,72 13,72 16 16 19,44 lfmax. 1,87 1,87 1,87 1,87 2,04 2,04 2,04 max. = nominal size k 7 8 9 10 11 12 13 k min. 6,78 7,78 8,78 9,78 10,73 11,73 12,73 r min. 0,6 0,6 0,6 0,6 0,8 0,8 0,8 nominal size
26、 8 10 12 12 14 14 17 min. 8,025 10,025 12,032 12,032 14,032 14,032 17,05 s max. 8,175 10,175 12,212 12,212 14,212 14,212 17,23 nominal size 5 5,3 5,5 6,5 7,5 8 8 min. 4,85 5,15 5,35 6,32 7,32 7,82 7,82 t max. 5,15 5,45 5,65 6,68 7,68 8,18 8,18 v max. 1,2 1,4 1,6 1,8 2 2,2 2,4 lcShank length lslglslg
27、lslglslglslglslglslgNominal length min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. 20 19,58 20,42 5,25 25 24,58 25,42 5,25 30 29,58 30,42 5,25 6 6 7,5 7,5 35 34,5 35,5 5,25 6 6 7,5 7,5 40 39,5 40,5 5,25 6 6 7,5 7,5 7,5 9 45 44,5 45,5 5,25 6 6 7,5 7,5 7,5 9 50 49,5 50,
28、5 11,25 20 6 6 7,5 7,5 7,5 9 (55) 54,4 55,6 16,25 25 11 21 6 7,5 7,5 7,5 9 60 59,4 60,6 21,25 30 16 26 12 22 7,5 7,5 7,5 9 70 69,4 70,6 31,25 40 26 36 22 32 15,5 28 11,5 24 7,5 9 80 79,4 80,6 41,25 50 36 46 32 42 25,5 38 21,5 34 17,5 30 9 90 89,3 90,7 35,5 48 31,5 44 27,5 40 21 36 100 99,3 100,7 45,
29、5 58 41,5 54 37,5 50 31 46 NOTE Use of bracketed thread sizes and nominal lengths should be avoided. aP is the thread pitch. bemin= 1,14 smincCommercial sizes of screw are those for which shank lengths have been specified. Nominal lengths over 100 mm shall be graded in increments of 10 mm, and those
30、 with nominal lengths over 200 mm shall be graded in increments of 20 mm. For screws with nominal lengths above the dashed line, the distance between the last fully formed thread and the bearing face shall be lg, max 3 P. Screws with nominal lengths below the dashed line have values of lgand lsin ac
31、cordance with the following equations: lg, max = lnominal size b, ls, min = lg, max 5 P 7 DIN 7984:2009-06 4 Technical delivery conditions Technical delivery conditions are specified in Table 2. Table 2 Technical delivery conditions Material Steel Stainless steel General requirements DIN ISO 8992 To
32、lerance class 6g Thread Standard DIN ISO 261, DIN ISO 965-2 Property class or steel gradea8.8 A2, A4 Mechanical properties Standard DIN EN ISO 898-1 DIN EN ISO 3506-1 Product grade A Limit deviations and geometrical tolerances Standard DIN EN ISO 4759-1 As processed Plain DIN EN ISO 4042 applies wit
33、h regard to electroplating. Surface finish DIN EN ISO 10683 applies with regard to zinc flake coatings. Surface discontinuities DIN EN 26157-1 applies with regard to limits for surface discontinuities. Acceptance inspection DIN EN ISO 3269 shall apply with regard to acceptance inspection. aSee Claus
34、e 5 for limitations on the strength of screws. 5 Reduced strength 5.1 Screws made of steel (other than stainless) Due to their head design, steel screws covered by this standard may not fulfil the ultimate tensile strength requirements for property class 8.8 as in DIN EN ISO 898-1 when tested accord
35、ing to test series FF1. Nevertheless, the screws shall meet all the other requirements relating to the material and characteristics for property class 8.8 as specified in DIN EN ISO 898-1. Furthermore, when tested in a test apparatus as in DIN EN ISO 898-1, full-size screws shall withstand the minim
36、um ultimate tensile loads given in Table 3 without fracture. If tested to failure, fracture may occur in the threaded section, the shank, the head, or at the head/shank junction. 8 DIN 7984:2009-06 Table 3 Minimum ultimate tensile loads for steel screws of property class 8.8 (equal to 80 % of the va
37、lues specified in DIN EN ISO 898-1) Thread d M 3 M 4 M 5 M 6 M 8 M 10 M 12 Minimum ultimate tensile load, in N 3 220 5 620 9 080 12 900 23 400 37 100 53 900 Thread d M 14 M 16 M 18 M 20 M 22 M 24 Minimum ultimate tensile load, in N 73 600 100 000 127 000 162 000 202 000 234 000 5.2 Stainless steel s
38、crews In the case of stainless steel screws, the minimum ultimate tensile loads resulting from the tensile strength specified in DIN EN ISO 3506-1 shall be reduced to 80 % (see Table 4). Table 4 Minimum ultimate tensile loads for stainless steel screws (equivalent to 80 % of strength class 70) Threa
39、d d M 3 M 4 M 5 M 6 M 8 M 10 M 12 M 14 M 16 M 18 M 20 M 22 M 24 Fm, min, kN 2,82 4,92 7,95 11,28 20,48 32,48 47,2 64,4 88 107,2 137,6 169,6 197,6Fm, min = As, nom Rm, min6 Designation Designation of an M 12 hexagon socket head cap screw with low head, of nominal length l = 60 mm and property class 8
40、.8 as specified in DIN EN ISO 898-1: Cap screw DIN 7984 M 12 60 08.8 Designation of an M 12 hexagon socket head cap screw with low head, of nominal length l = 60 mm and steel grade A2 as specified in DIN EN ISO 3506-1: Cap screw DIN 7984 M 12 60 A2 See DIN 962 for supplementary order designations fo
41、r special screw types and finishes. 9 DIN 7984:2009-06 Annex A (informative) Mass of steel screws Thread d M 3 M 4 M 5 M 6 M 8 M 10 M 12 (M14) M 16 (M 18) M 20 (M 22) M 24Nominal length l Mass (7,85 kg/dm3) in kg per 1 000 items 5 0,48 6 0,52 0,96 8 0,6 1,12 2,26 10 0,69 1,28 2,5 3,59 12 0,78 1,44 2
42、,74 3,94 8,05 14 0,86 1,6 2,98 4,29 8,65 16 0,97 1,76 3,22 4,64 9,25 14,4 18 1,1 1,95 3,46 4,99 9,85 15,4 20 1,2 2,15 3,77 5,34 10,5 16,4 24,1 25 2,64 4,54 6,45 12 19 27,7 30 5,31 7,56 14 21,6 31,3 46,5 62,1 35 8,67 16 24,7 34,9 51,4 68,840 9,78 18 27,8 39,3 56,3 75,5 99 130 45 20 30,9 43,7 62,3 82,
43、2 107 140 50 22 34 48,1 68,3 89,6 115 150 188 223 55 24 37,1 52,5 74,3 97 125 160 201 238 60 26 40,2 56,9 80,3 104 135 172 214 253 70 46,4 65,8 92,4 119 155 197 244 288 80 74,7 105 134 175 222 274 324 90 195 247 304 359 100 215 272 334 395 NOTE The values of mass are specified for commercial sizes and are for guidance only. 10 DIN 7984:2009-06 11 Bibliography DIN 4000-160, Tabular layout of product properties Part 160: Fasteners with external thread
