1、 KSKSKSKSKSKSKSK KSKSKS KSKSK KSKS KSK KS KS B ISO 2306 KS B ISO 2306:2012 2012 12 11 http:/www.kats.go.krKS B ISO 2306:2012 : ( ) ( ) (AMS) ( ) : (http:/www.standard.go.kr) ： ：2003 02 25 ：2012 12 11 2012-0692 ： ： ( 02-509-7274) (http:/www.kats.go.kr). 10 5 , . KS B ISO 2306:2012 i ii 1 1 2 1 3 ISO
2、.1 3.1 .1 3.2 .3 4 ISO .5 4.1 .5 4.2 .7 5 .7 5.1 (KS B ISO 228 .).7 5.2 (KS B ISO 7 .) 8 A( ) ISO 9 KS B ISO 2306:2012 11 KS B ISO 2306:2012 ii 1972 1 ISO 2306, Drills for use prior to tapping screw threads , . KS B ISO 2306:2012 Drills for use prior to tapping screw threads 1 . . . a) ISO ( ： 1, 2
3、) b) ISO (UNC, UNF： 3, 4 ) c) ( 5, 6 ) KS B ISO 235 , . 2 . . ( ) . KS B ISO 7 1, , KS B ISO 7 2, 2： KS B ISO 228 1, , KS B ISO 228 2, KS B ISO 235, , ISO 261:1998, ISO general purpose metric screw threads General plan ISO 263:1973, ISO inch screw threads General plan and selection for screws, bolts
4、 and nuts Diameter range 0.06 to 6 in 3 ISO 3.1 KS B ISO 2306:2012 2 1 ： mm 5H 6H 7H 5H, 6H, 7H 1 0.25 0.785 0.792 0.75 1.1 0.25 0.885 0.829 0.85 1.2 0.25 0.985 0.929 0.95 1.4 0.3 1.142 1.160 1.075 1.10 1.6 0.35 1.301 1.321 1.221 1.25 1.8 0.35 1.501 1.521 1.421 1.45 2 0.4 1.657 1.679 1.567 1.60 2.2
5、0.45 1.813 1.838 1.713 1.75 2.5 0.45 2.113 2.138 2.013 2.05 3 0.5 2.571 2.599 2.639 2.459 2.50 3.5 0.6 2.975 3.010 3.050 2.850 2.90 4 0.7 3.382 3.422 3.466 3.242 3.30 4.5 0.75 3.838 3.878 3.924 3.688 3.70 5 0.8 4.294 4.334 4.384 4.134 4.20 6 1 5.107 5.153 5.217 4.917 5.00 7 1 6.107 6.153 6.217 5.917
6、 6.00 8 1.25 6.859 6.912 6.982 6.647 6.80 9 1.25 7.859 7.912 7.982 7.647 7.80 10 1.5 8.612 8.676 8.751 8.376 8.50 11 1.5 9.612 9.676 9.751 9.376 9.50 12 1.75 10.371 10.441 10.531 10.106 10.20 14 2 12.135 12.210 12.310 11.835 12.00 16 2 14.135 14.210 14.310 13.835 14.00 18 2.5 15.649 15.744 15.854 15
7、.294 15.50 20 2.5 17.649 17.744 17.854 17.294 17.50 22 2.5 19.649 19.744 19.854 19.294 19.50 24 3 21.152 21.252 21.382 20.752 21.00 27 3 24.152 24.252 24.382 23.752 24.00 30 3.5 26.661 26.771 26.921 26.211 26.50 33 3.5 29.661 29.771 29.921 29.211 29.50 36 4 32.145 32.270 32.420 31.670 32.00 39 4 35.
8、145 35.270 35.420 34.670 35.00 42 4.5 37.659 37.799 37.979 37.129 37.50 45 4.5 40.659 40.799 40.979 40.129 40.50 48 5 43.147 43.297 43.487 42.587 43.00 52 5 47.147 47.297 47.487 46.587 47.00 56 5.5 50.646 50.796 50.996 50.046 50.50 KS B ISO 2306:2012 3 3.2 2 ： mm 5H 6H 7H 5H, 6H, 7H 2.5 2.201 2.221
9、2.121 2.15 3 2.701 2.721 2.621 2.65 3.5 0.35 3.201 3.221 3.121 3.15a4 3.571 3.599 3.639 3.459 3.50 4.5 4.071 4.099 4.139 3.959 4.00 5 4.571 4.599 4.639 4.459 4.50 5.5 0.5 5.071 5.099 5.139 4.959 5.00 6 5.338 5.378 5.424 5.188 5.20 7 6.338 6.378 6.424 6.188 6.20 8 7.338 7.378 7.424 7.188 7.20 9 8.338
10、 8.378 8.424 8.188 8.20 10 9.338 9.378 9.424 9.188 9.20 11 0.75 10.338 10.378 10.424 10.188 10.20 8 7.107 7.153 7.217 6.917 7.00 9 8.107 8.153 8.217 7.917 8.00 10 9.107 9.153 9.217 8.917 9.00 11 10.107 10.153 10.217 9.917 10.00. 12 11.107 11.153 11.217 10.917 11.00 14 13.107 13.153 13.217 12.917 13.
11、00 15 14.107 14.153 14.217 13.917 14.00 16 15.107 15.153 15.217 14.917 15.00 17 16.107 16.153 16.217 15.917 16.00 18 17.107 17.153 17.217 16.917 17.00 20 19.107 19.153 19.217 18.917 19.00 22 21.107 21.153 21.217 20.917 21.00 24 23.107 23.153 23.217 22.917 23.00 25 24.107 24.153 24.217 23.917 24.00 2
12、7 26.107 26.153 26.217 25.917 26.00 28 27.107 27.153 27.217 26.917 27.00 30 1 29.107 29.153 29.217 28.917 29.00 10 8.859 8.912 8.982 8.647 8.80 12 10.859 10.912 10.982 10.647 10.80 14 1.25 12.859 12.912 12.982 12.647 12.80 KS B ISO 2306:2012 4 2 ( ) ： mm 5H 6H 7H 5H, 6H, 7H 12 10.612 10.676 10.751 1
13、0.376 10.50 14 12.612 12.676 12.751 12.376 12.50 15 13.612 13.676 13.751 13.376 13.50 16 14.612 14.676 14.751 14.376 14.50 17 15.612 15.676 15.751 15.376 15.50 18 16.612 16.676 16.751 16.376 16.50 20 18.612 18.676 18.751 18.376 18.50 22 20.612 20.676 20.751 20.376 20.50 24 22.612 22.676 22.751 22.37
14、6 22.50 25 23.612 23.676 23.751 23.376 23.50 26 24.612 24.676 24.751 24.376 24.50 27 25.612 25.676 25.751 25.376 25.50 28 26.612 26.676 26.751 26.376 26.50 30 28.612 28.676 28.751 28.376 28.50 32 30.612 30.676 30.751 30.376 30.50 33 31.612 31.676 31.751 31.376 31.50 35 33.612 33.676 33.751 33.376 33
15、.50 36 34.612 34.676 34.751 34.376 34.50 38 36.612 36.676 36.751 36.376 36.50 39 37.612 37.676 37.751 37.376 37.50 40 38.612 38.676 38.751 38.376 38.50 42 40.612 40.676 40.751 40.376 40.50 45 43.612 43.676 43.751 43.376 43.50 48 46.612 46.676 46.751 46.376 46.50 50 48.612 48.676 48.751 48.376 48.50
16、52 1.5 50.612 50.676 50.751 50.376 50.50 18 16.135 16.210 16.310 15.835 16.00 20 18.135 18.210 18.310 17.835 18.00 22 20.135 20.210 20.310 19.835 20.00 24 22.135 22.210 22.310 21.835 22.00 25 23.135 23.210 23.310 22.835 23.00 27 25.135 25.210 25.310 24.835 25.00 28 26.135 26.210 26.310 25.835 26.00
17、30 28.135 28.210 28.310 27.835 28.00 32 2 30.135 30.210 30.310 29.835 30.00 KS B ISO 2306:2012 5 2 ( ) ： mm 5H 6H 7H 5H, 6H, 7H 33 31.135 31.210 31.310 30.835 31.00 36 34.135 34.210 34.310 33.835 34.00 39 37.135 37.210 37.310 36.835 37.00 40 38.135 38.210 38.310 37.835 38.00 42 40.135 40.210 40.310
18、39.835 40.00 45 43.135 43.210 43.310 42.835 43.00 48 46.135 46.210 46.310 45.835 46.00 50 48.135 48.210 48.310 47.835 48.00 52 2 50.135 50.210 50.310 49.835 50.00 30 27.152 27.252 27.382 26.752 27.00 33 30.152 30.252 30.382 29.752 30.00 36 33.152 33.252 33.382 32.752 33.00 39 36.152 36.252 36.382 35
19、.752 36.00 40 37.152 37.252 27.382 36.752 37.00 42 39.152 39.252 39.382 38.752 39.00 45 42.152 42.252 42.382 41.752 42.00 48 45.152 45.252 45.382 44.752 45.00 50 47.152 47.252 47.382 46.752 47.00 52 3 49.152 49.252 49.382 48.752 49.00 42 38.145 38.270 38.420 36.670 38.00 45 41.145 41.270 41.420 40.6
20、70 41.00 48 44.145 44.270 44.420 43.670 44.00 52 4 48.145 48.270 48.420 47.670 48.00 aKS B ISO 235 . 4 ISO 4.1 KS B ISO 2306:2012 6 3 ： mm( ) (in) 2Ba 3B 2B 3Ba No 1 64 0.397 1.582 1.582 1.425 1.55 No 2 56 0.454 1.872 1.872 1.694 1.85 No 3 48 0.529 2.146 2.146 1.941 2.10 No 4 40 0.635 2.385 2.385 2.
21、156 2.35 No 5 40 0.635 2.697 2.697 2.487 2.65 No 6 32 0.794 2.896 2.896 2.642 2.85 No 8 32 0.794 3.531 3.528 3.302 3.50 No 10 24 1.058 3.962 3.950 3.683 3.90 No 12 24 1.058 4.597 4.590 4.343 4.50 1/4 20 1.270 5.268 5.250 4.976 5.10 5/16 18 1.411 6.734 6.680 6.411 6.60 3/8 16 1.588 8.164 8.082 7.805
22、8.00 7/16 14 1.814 9.550 9.441 9.149 9.40 1/2 13 1.954 11.013 10.881 10.584 10.80 9/16 12 2.117 12.456 12.301 11.996 12.20 5/8 11 2.309 13.868 13.693 13.376 13.50 3/4 10 2.540 16.833 16.624 16.299 16.50 7/8 9 2.822 19.748 19.520 19.169 19.50 1 8 3.175 22.598 22.344 21.963 22.25 1 1/8 7 3.629 25.349
23、25.082 24.648 25.00 1 1/4 7 3.629 28.524 28.258 27.823 28.00 1 3/8 6 4.233 31.120 30.851 30.343 30.75 1 1/2 6 4.233 34.295 34.026 33.518 34.00 1 3/4 5 5.080 39.814 39.560 38.951 39.50 2 4 1/2 5.644 45.598 45.367 44.689 45.00 a 1 . KS B ISO 2306:2012 7 4.2 4 ： mm( ) (in) 2Ba 3B 2B 3Ba No 0 80 0.318 1
24、.306 1.306 1.181 1.25 No 1 72 0.353 1.613 1.613 1.473 1.55 No 2 64 0.397 1.913 1.913 1.755 1.90 No3 56 0.454 2.197 2.197 2.024 2.15 No 4 48 0.529 2.459 2.459 2.271 2.40 No 5 44 0.577 2.741 2.741 2.550 2.70 No 6 40 0.635 3.023 3.012 2.819 2.95 No 8 36 0.706 3.607 3.597 3.404 3.50 No 10 32 0.794 4.166
25、 4.168 3.962 4.10 No 12 28 0.907 4.724 4.717 4.496 4.70 1/4 28 0.907 5.580 5.563 5.367 5.50 5/16 24 1.058 7.038 6.995 6.792 6.90 3/8 24 1.058 8.626 8.565 8.379 8.50 7/16 20 1.270 10.030 9.947 9.738 9.90 1/2 20 1.270 11.618 11.524 11.326 11.50 9/16 18 1.411 13.084 12.969 12.761 12.90 5/8 18 1.411 14.
26、671 14.554 14.348 14.50 3/4 16 1.588 17.689 17.546 17.330 17.50 7/8 14 1.814 20.663 20.493 20.262 20.40b1 23.569 23.363 23.109 23.25 1 1/8 26.744 26.538 26.284 26.50 1 1/4 29.919 29.713 29.459 29.50 1 3/8 33.094 32.888 32.634 32.75b1 1/2 12 2.117 36.269 36.063 35.809 36.00 a 1 . b KS B ISO 235 . 5 5
27、.1 (KS B ISO 228 .) KS B ISO 2306:2012 8 5 ： mm( ) (in) 1/8 28 0.907 8.848 8.566 8.80 1/4 19 11.890 11.445 11.80 3/8 19 1.337 16.395 14.950 15.25 1/2 19.172 18.631 19.00 5/8 21.128 20.587 21.00 3/4 24.658 24.117 24.50 7/8 14 1.814 28.418 27.877 28.25 1 30.931 30.291 30.75 1 1/4 39.592 38.952 39.50 1
28、 1/2 45.485 44.845 45.00 1 3/4 51.428 50.788 51.00 2 11 2.309 57.296 56.656 57.00 5.2 (KS B ISO 7 .) 6 ： mm( ) (in) 1/8 28 0.907 8.637 8.495 8.60 1/4 11.549 11.341 11.50 3/8 19 1.337 15.054 14.846 15.00 1/2 18.773 18.489 18.50 3/4 14 1.814 24.259 23.975 24.00 1 30.471 30.111 30.25 1 1/4 39.132 38.77
29、2 39.00 1 1/2 45.025 44.665 45.00 2 11 2.309 56.836 50.476 56.50aa KS B ISO 235 . KS B ISO 2306:2012 9 A ( ) ISO ： mm 0.25 0.3 0.35 0.4 0.45 0.5 0.6 0.7 0.75 0.8 1 1.25 1.5 1.75 2 2.5 3 3.5 4 4.5 5 5.51 0.75 1. 0.85 1.2 0.95 1.4 1.0 1.6 1.25 1.8 1.45 2 1.60 2. 1.75 2.5 2.15 2.05 3 2.65 2.50 3.5 3.15
30、 2.90 4 3.50 3.0 4.5 4.00 3.70 5 4.50 4.20 5. 5.0 6 5.20 5.0 7 6.20 6.0 8 7.20 7.00 6.80 9 8.20 8.00 7.80 10 9.20 9.00 8.80 8.50 11 10.20 10.00 9.50 12 11.00 10.80 10.50 10.20 14 13.00 12.80 12.50 12.00 15 14.00 13.50 16 15.00 14.50 14.00 17 16.00 15.50 18 17.00 16.50 16.00 15.50 20 19.00 18.50 18.0
31、0 17.50 22 21.00 20.50 20.00 19.50 24 23.00 22.50 22.00 21.00 25 24.00 23.50 23.00 26 24.50 27 26.00 25.50 25.00 24.00 28 27.00 26.50 26.00 30 29.00 28.50 28.00 27.00 26.50 32 30.50 30.0 33 31.50 31.00 30.00 29.50 KS B ISO 2306:2012 10 ： mm 0.25 0.3 0.35 0.4 0.45 0.5 0.6 0.7 0.75 0.8 1 1.25 1.5 1.75
32、 2 2.5 3 3.5 4 4.5 5 5.535 3.50 36 34.50 34.00 33.00 32.00 38 36.50 39 37.50 37.00 36.00 35.00 40 38.50 38.00 37.00 42 40.50 40.00 39.00 38.00 37.50 45 43.50 43.00 42.00 41.00 40.50 48 46.50 46.00 45.00 44.00 43.00 50 48.50 48.00 47.00 52 50.50 50.00 49.00 48.00 47.00 56 50.50 KS B ISO 2306:2012 11
33、KS B ISO 2306:2012 , . KS A 0001:2008( ) 2003 . 1 . 2 a) WTO . b) ISO 2306 . 3 ISO 2306, Drills for use prior to tapping screw threads , . 153787 1 92 3(13) (02)26240114 (02)262401489 http:/ Korean Agency for Technology and Standards http:/www.kats.go.kr KS B ISO 2306:2012 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Drills for use prior to tapping screw threads ICS 25.100.30
