1、 KSKSKSKSKSKSKSK KSKSKS KSKSK KSKS KSK KS KS B ISO 2540 BKS B ISO 2540: 2013 2013 4 5 http:/www.kats.go.krKS B ISO 2540:2013 : ( ) ( ) (AMS) ( ) : (http:/www.standard.go.kr) : :2003 7 25 :2013 4 5 2013-0126 : : ( 02-509-7274) (http:/www.kats.go.kr). 10 5 , . KS B ISO 2540:2013 i 1973 1 ISO 2540, Cen
2、tre drills for centre holes with protecting chamferType B , . KS B ISO 2540:2013 B Centre drills for centre holes with protecting chamfer Type B 1 B ( .) . . . 2 ( B ), d d1 ( 1 ). B 2.5/10 3 . KS B ISO 2540:2013 2 1 B 1 : mm d ad1d2l L k12 h9 k12 1.0 4.0 2.12 1.9 1.3 37.5 33.5 (1.25) 5.0 2.65 2.2 1
3、.6 42 38 1.6 6.3 3.35 2.8 2.0 47 43 2.0 8.0 4.25 3.3 2.5 52 48 2.5 10.0 5.30 4.1 3.1 59 53 3.15 11.2 6.70 4.9 3.9 63 57 4.0 14.0 8.50 6.2 5.0 70 64 (5.0) 18.0 10.60 7.5 6.3 78 72 6.3 20.0 13.20 9.2 8.0 83 77 (8.0) 25.0 17.00 11.5 10.1 103 97 10.0 31.5 21.20 14.2 12.8 128 122 a ( ) . KS B ISO 2540:20
4、13 3 A ( ) B 1 2 : mm 1 2 d a D l1 t 1.0 3.15 1.27 0.9 (1.25) 4 1.60 1.1 1.6 5 1.99 1.4 2.0 6.3 2.54 1.8 2.5 8 3.20 2.2 3.15 10 4.03 2.8 4.0 12.5 5.05 3.5 (5.0) 16 6.41 4.4 6.3 18 7.36 5.5 (8.0) 22.4 9.35 7.0 10.0 28 11.66 8.7 a ( ) .bl , t . ab B 153787 1 145 3(16) (02)26240114 (02)26240148 http:/ Korean Agency for Technology and Standards http:/www.kats.go.kr KS B ISO 2540:2013 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Centre drills for centre holes with protecting chamferType B ICS 25.100.30