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!$J“1618839www.din.deDDIN 6912Hexagon socket thin head cap screws with pilot recessEnglish translation of DIN 6912:2009-06Zylinderschrauben mit Innensechskant Niedriger Kopf, mit SchlsselfhrungEnglische bersetzung von DIN 6912:2009-06Vis tte cylindrique six pans creux centrage, avec tte basse
3、Traduction anglaise de DIN 6912:2009-06SupersedesDIN 6912:2002-12www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1103.10 DIN 6912:2009-06 A comma is used as the decimal marker. Contents Page Foreword3 1 Scope .4 2 Normative referen
4、ces.4 3 Dimensions .5 4 Technical delivery conditions .8 5 Reduced loadability8 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 6912:2009-06 Foreword This standard has been prepared
5、by Working Committee NA 067-03-01 AA Verbindungselemente mit Auengewinde of the 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 fr
6、om DIN 6912:2002-12 as follows: a) Normative references have been updated. b) Figure 1 has been revised. c) Test programme B for determining the loadability has been replaced by test series FF1 (see 5.1). d) The designation has been changed. e) The standard has been editorially revised. f) Screws ma
7、de of nonferrous metal are no longer included. g) An angle for the head bearing face (at the rounded or chamfered bottom edge of the head) has been specified. h) Minimum ultimate tensile loads for stainless steel screws have been specified. Previous editions DIN 6912: 1954x-03, 1967-12, 1985-05, 200
8、2-12 3 DIN 6912:2009-06 1 Scope This standard specifies dimensions and technical delivery conditions for sizes M4 to M36 hexagon socket head cap screws with pilot recess, of product grade A as in DIN EN ISO 4759-1 and made of steel and stainless steel. Where screws are to comply with specifications
9、other than those given in this standard, these shall be selected in accordance with the relevant standards, e.g. DIN ISO 261, DIN EN ISO 898-1, DIN ISO 965-2, DIN EN ISO 3506-1 und DIN EN ISO 4759-1. Screws specified in this standard should not be used in the form of screw assemblies with captive wa
10、shers as they are always required to have a short unthreaded portion of shank to compensate for the pilot recess. NOTE Due to their head geometry, screws complying with this standard have a reduced loadability (see clause 5). 2 Normative references The following referenced documents are indispensabl
11、e 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. DIN 962, Designation system for fasteners DIN EN 20225, Fasteners Bolts, screws, studs and nuts Symb
12、ols and designations of dimensioning 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 Coa
13、rse thread and fine pitch 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
14、external ISO metric thread 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,
15、 ISO general purpose metric 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 threa
16、ds Medium quality DIN ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts 4 DIN 6912:2009-06 3 Dimensions See Figure 1 and Table 1. Symbols and designations are given in DIN EN 20225. Dimensions in millimetres Key 1 Chamfered end as in DIN EN ISO 4753 aLength of incomplete thr
17、ead, u 2 P bSlight rounding or countersinking at the mouth of the socket is permitted (no further than e) cTop edge of head rounded or chamfered (optional) dBottom edge of head may be rounded or chamfered to dw, but shall always be free from burr eDatum for dwfdsapplies if values of ls, minare speci
18、fied Figure 1 Screw dimensions (notation) Maximum underhead fillet Lf, max = 1,7 rmax2max s,max,amaxddr= For rmin, see Table 1. 5 DIN 6912:2009-06 Table 1 Screw dimensions Dimensions in millimetres Thread size d M4 M5 M6 M8 M10 M12 (M14) M16 Pa0,7 0,8 1 1,25 1,5 1,75 2 2 l 12514 16 18 22 26 30 34 38
19、 125 200 57 Damax. 4,7 5,7 6,8 9,2 11,2 13,7 15,7 17,7 min. = nominal size 2 2,5 3 4 5 6 7 8 dhmax. 2,06 2,56 3,06 4,075 5,075 6,075 7,09 8,09 max. = nominal size 7 8,5 10 13 16 18 21 24 dkmin. 6,78 8,28 9,78 12,73 15,73 17,73 20,67 23,67 max. = nominal size 4 5 6 8 10 12 14 16 dsmin. 3,82 4,82 5,82
20、 7,78 9,78 11,73 13,73 15,73 dwmin. 6,2 7,7 9,2 12,03 15,03 17,03 19,83 22,83 ebmin. 3,44 4,58 5,72 6,86 9,15 11,43 13,72 16 lfmax. 0,6 0,6 0,68 1,02 1,02 1,45 1,45 1,45 max. = nominal size 2,8 3,5 4 5 6,5 7,5 8,5 10 k min. 2,66 3,32 3,82 4,82 6,28 7,28 8,28 9,78 r min. 0,2 0,2 0,25 0,4 0,4 0,6 0,6
21、0,6 Nominal size 3 4 5 6 8 10 12 14 min. 3,02 4,02 5,02 6,02 8,025 10,025 12,032 14,032 s max. 3,10 4,12 5,14 6,14 8,175 10,175 12,212 14,212 Nominal size 1,6 2 2,5 3 3,5 4 4,5 5,5 min. 1,48 1,88 2,38 2,88 3,35 3,85 4,35 5,35 t1max. 1,72 2,12 2,62 3,12 3,65 4,15 4,65 5,65 min. 3,3 4 5 6,5 7,5 9 10 1
22、1,5 t2max. 3,6 4,3 5,3 6,86 7,86 9,36 10,36 11,93 v max. 0,4 0,5 0,6 0,8 1 1,2 1,4 1,6 lcShank length lslglslglslglslglslglslglslglslgNominal size min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max.10 9,71 10,29 1,4 3,5 1,8 4,2 2,5 5,5 12 11,65 12,35 1,4 3,5 1,8
23、 4,2 2,5 5,5 3,2 7 16 15,65 16,35 1,4 3,5 1,8 4,2 2,5 5,5 3,2 7 3,5 8 4,2 9,5 20 19,58 20,42 2,5 6 1,8 4,2 2,5 5,5 3,2 7 3,5 8 4,2 9,5 4,5 10,5 5 11 25 24,58 25,42 7,5 11 5 9 2,5 5,5 3,2 7 3,5 8 4,2 9,5 4,5 10,5 5 11 30 29,58 30,42 12,5 16 10 14 7 12 3,2 7 3,5 8 4,2 9,5 4,5 10,5 5 11 35 34,5 35,5 17
24、,5 21 15 19 12 17 6,75 13 3,5 8 4,2 9,5 4,5 10,5 5 11 40 39,5 40,5 22,5 26 20 24 17 22 11,75 18 6,5 14 4,2 9,5 4,5 10,5 5 11 50 49,5 50,5 32,5 36 30 34 27 32 21,75 28 16,5 24 11,5 20 4,5 10,5 5 11 60 59,4 60,6 40 44 37 42 31,75 38 26,5 34 21,5 30 16 26 12 22 70 69,4 70,6 47 52 41,75 48 36,5 44 31,5
25、40 26 36 22 32 80 79,4 80,6 51,75 58 46,5 54 41,5 50 36 46 32 42 90 89,3 90,7 56,5 64 51,5 60 46 56 42 52 100 99,3 100,7 61,5 70 56 66 52 62 (110) 109,3 110,7 66 76 62 72 120 119,3 120,7 76 86 72 82 (130) 129,2 130,8 76 86 140 139,2 140,8 86 96 6 DIN 6912:2009-06 Table 1 (continued) Dimensions in mi
26、llimetres Thread size d (M18) M20 (M22) M24 (M27) M30 (M33) M36 Pa2,5 2,5 2,5 3 3 3,5 3,5 4 l 125 42 46 50 54 60 66 72 78 125 200 61 65 69 73 79 85 91 97 damax. 20,2 22,4 24,4 26,4 30,4 33,4 36,4 39,4 min. = nominal size 8 10 10 12 12 15 16,5 18 dhmax. 8,09 10,09 10,09 12,11 12,11 15,11 16,61 18,11
27、max. = nominal size 27 30 33 36 40 45 50 54 dkmin. 26,67 29,67 32,61 35,61 39,61 44,61 49,61 53,54 max. = nominal size 18 20 22 24 27 30 33 36 dsmin. 17,73 19,67 21,67 23,67 26,67 29,67 32,61 35,61 dwmin. 25,83 28,83 31,61 34,61 38,61 43,61 48,61 52,34 ebmin. 16 19,44 19,44 21,73 21,73 25,15 27,43 3
28、0,85 lfmax. 1,87 2,04 2,04 2,04 2,89 2,89 2,89 2,89 max. = nominal size 11 12 13 14 16 17,5 19,5 21,5 k min. 10,73 11,73 12,73 13,73 15,73 17,23 19,17 21,17 r min. 0,6 0,8 0,8 0,8 1 1 1 1 Nominal size 14 17 17 19 19 22 24 27 min. 14,032 17,05 17,05 19,065 19,065 22,065 24,065 27,065 s max. 14,212 17
29、,23 17,23 19,275 19,275 22,275 24,275 27,275 Nominal size 6 6,5 7 7 8,5 9 10 11,5 min. 5,85 6,32 6,82 6,82 8,32 8,82 9,82 11,28 t1max. 6,15 6,68 7,18 7,18 8,68 9,18 10,18 11,72 min. 12,5 14 15 16 17 19 20 24 t2max. 12,93 14,43 15,43 16,43 17,43 19,52 20,52 24,52 v max. 1,8 2 2,2 2,4 2,7 3 3,3 3,6 lc
30、Shank length lslglslglslglslglslglslglslglslgNominal size min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max.25 24,58 25,42 5,5 13 30 29,58 30,42 5,5 13 6,5 14 35 34,5 35,5 5,5 13 6,5 14 40 39,5 40,5 5,5 13 6,5 14 6,5 14 50 49,5 50,5 5,5 13 6,5 14 6,5 14 60 59,4
31、 60,6 5,5 13 6,5 14 6,5 14 7 16 70 69,4 70,6 15,5 28 11,5 24 6,5 14 7 16 8 17 8,5 19 80 79,4 80,6 25,5 38 21,5 34 17,5 30 7 16 8 17 8,5 19 9,5 20 90 89,3 90,7 35,5 48 31,5 44 27,5 40 21 36 8 17 8,5 19 9,5 20 10,5 22,5100 99,3 100,7 45,5 58 41,5 54 37,5 50 31 46 25 40 8,5 19 9,5 20 10,5 22,5(110) 109
32、,3 110,7 55,5 68 51,5 64 47,5 60 41 56 35 50 26,5 44 9,5 20 10,5 22,5120 119,3 120,7 65,5 78 61,5 74 57,5 70 51 66 45 60 36,5 54 30,5 48 10,5 22,5(130) 129,2 130,8 69,5 82 65,5 78 61,5 74 55 70 49 64 40,5 58 34,5 52 26 46 140 139,2 140,8 79,5 92 75,5 88 71,5 84 65 80 59 74 50,5 68 44,5 62 36 56 (150
33、) 149,2 150,8 89,5 102 85,5 98 81,5 94 75 90 69 84 60,5 78 54,5 72 46 66 160 159,2 160,8 95,5 108 91,5 104 85 100 79 94 70,5 88 64,5 82 56 76 (170) 169,2 170,8 105,5 118 101,5 114 95 110 89 104 80,5 98 74,5 92 66 86 180 179,2 180,8 115,5 128 111,5 124 105 120 99 114 90,5 108 84,5 102 76 96 (190) 189
34、,1 190,9 121,5 134 115 130 109 124 100,5 118 94,5 112 86 106 200 199,1 200,9 131,5 144 125 140 119 134 110,5 128 104,5 122 96 116 NOTE Use of sizes in brackets should be avoided. aP is the thread pitch. bemin= 1,14 smin cCommercial sizes of screws are those for which lengths lsand lghave been specif
35、ied. Nominal lengths, l, exceeding 200 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 bearing face lg, max 5 P. For lengths below the line, lgand lsare to be calculated using the following equations:
36、 lg, max = lnom b ls, min = lg,max 5 P 7 DIN 6912:2009-06 4 Technical delivery conditions The technical delivery conditions shall be as given in Table 2. Table 2 Technical delivery conditions Material Steel Stainless steel General requirements DIN ISO 8992 Tolerance class 6g Thread Standards DIN ISO
37、 261, DIN ISO 965-2 Property class or steel gradea8.8 M24: A2, A4 M24: A2 Mechanical properties Standards 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 shall apply with regard to electropla
38、ting. Surface finish DIN EN ISO 10683 shall apply with regard to non-electrolytically applied zinc flake coatings. Surface discontinuities DIN EN 26157-1 shall apply with regard to limits for surface discontinuities. Acceptance inspection DIN EN ISO 3269 shall apply with regard to acceptance inspect
39、ion. aFor specifications regarding reduced loadability, see clause 5. 5 Reduced loadability 5.1 Screws made of steel (other than stainless) When tested as specified in DIN EN ISO 898-1 (test series FF1), steel screws covered by this standard may not fulfil the tensile strength requirements for prope
40、rty class 8.8 due to their head geometry. All other requirements shall, however, be met. When testing full-size screws using apparatus as specified in DIN EN ISO 898-1, the minimum ultimate tensile loads, Fm,min, given in Table 3 shall be applied. Any failure shall occur in the shank, along the free
41、 threaded length, in the head, or at the head/shank transition. 8 DIN 6912:2009-06 Table 3 Minimum ultimate tensile loads for steel screws of property class 8.8 (equal to 80 % of the load required in DIN EN ISO 898-1) Thread size d M4 M5 M6 M8 M10 M12 M14 M16 Fm, min, N 5 620 9 080 12 900 23 400 37
42、100 53 900 73 600 100 000 Thread size d M18 M20 M22 M24 M27 M30 M33 M36 Fm, min, N 127 000 162 000 202 000 234 000 309 000 373 000 461 000 542 000 5.2 Stainless steel screws In the case of stainless steel screws, the tensile strength shall be equal to 80 % of the values specified in DIN EN ISO 3506-
43、1 (see Table 4). Table 4 Minimum ultimate tensile loads for stainless steel screws Fm, minkN Thread size d 80 % of property class 50 80 % of property class 70 M4 4,92 M5 7,95 M6 11,28 M8 20,48 M10 32,48 M12 47,2 M14 64,4 M16 88 M18 107,2 M20 137,6 M22 169,6 M24 197,6 M27 184 M30 224,8 M33 277,6 M36
44、327,2 Fm, min= As, nom Rm, min6 Designation Designation of an M12 hexagon socket thin head cap screw (M12) with pilot recess, with a nominal length l = 60 mm, of property class 8.8 as in DIN EN ISO 898-1: Screw DIN 6912 M12 60 08.8 Designation of an M12 hexagon socket thin head cap screw (M12) with
45、pilot recess, with a nominal length l = 60 mm, of steel grade A2 as in DIN EN ISO 3506-1: Screw DIN 6912 M12 60 A2 See DIN 962 for supplementary order designations for special screw types and finishes. 9 DIN 6912:2009-06 Annex A (informative) Mass of steel screws Thread size d M4 M5 M6 M8 M10 M12 M1
46、4 M16 Nominal length l Mass (7,85 kg/dm3) kg per 1 000 units 10 1,3 2,2 3,6 12 1,5 2,5 3,9 7,7 16 1,9 3,1 4,5 8,8 15,5 22,3 20 2,3 3,7 5,2 10,2 17,9 25,5 37,9 52,5 25 2,7 4,4 6,2 12,5 20,2 29,5 42,5 56,5 30 3,2 5,1 7,3 14 22 32,5 48 63 35 3,4 5,8 8,3 15,7 25,5 36,5 53 69,7 40 4,2 6,6 9,5 17,5 28,5 4
47、0 58 78,7 50 5,2 7,3 11,5 21,5 34,8 48 69,5 91,5 60 9 13,6 25,3 40,3 57 82 107 70 15,7 29,1 46 65 92,5 122 80 32,8 52,5 72 104 140 90 57,8 80 116 154 100 88 127 169 110 139 183 120 151 198 130 212 140 226 Thread size d M18 M20 M22 M24 M27 M30 M33 M36 Nominal length l Mass (7,85 kg/dm3) kg per 1 000
48、units 25 7 30 84,6 108 35 93,3 118 40 102 128 185 50 119 150 215 60 138 172 245 263 70 157 196 275 298 445 498 80 178 222 305 333 490 552 793 90 196 245 335 369 535 607 860 1 000 100 215 269 365 407 580 662 927 1 080 110 235 292 395 439 625 717 994 1 160 120 255 316 425 474 670 772 1 060 1 240 130 275 342 455 510 715 8
