Technical Information

Details of Drilling Standard
Size
(NB)		 Description of Dimension BS.10 BS.10
T-D		 BS.10
T-E		 BS.10
T-F		 ANSI
B-16.5		 ASA
150		 DIN. PN10 IS
6392 T11 & 17		 BD 4504 T 6/3 or
IS 6392 T5 & 6		 JIS
½"
15 MM		 THICK 13 13 13 13 11 11 14 12 12
OD 114 95 95 95 88.9 89 95 80 95
PCD 83 67 67 67 60.3 60 65 55 70
HOLE DIA. 18 14 14 14 14 14 14 11 15
NO. OF HOLES 4 4 4 4 4 4 4 4 4
¾" 
20MM		 THICK 13 13 13 13 12.7 11 16 14 14
OD 114 102 102 102 98.4 98 105 90 100
PCD 83 73 73 73 69.8 70 75 65 95
HOLE DIA. 18 14 14 14 14 14 14 11 15
NO. OF HOLES 4 4 4 4 4 4 4 4 4
1" 
25MM		 THICK 14 13 13 13 14.2 11 16 14 16
OD 121 114 114 121 107.9 108 115 100 125
PCD 87 83 83 87 79.3 79 85 75 90
HOLE DIA. 18 14 14 18 14 14 14 11 19
NO. OF HOLES 4 4 4 4 4 4 4 4 4
1 ¼" 
32MM		 THICK 16 16 16 16 15.2 13 16 16 16
OD 133 121 121 133 117.4 117 140 120 135
PCD 98 87 87 98 88.9 89 100 90 100
HOLE DIA. 18 14 14 18 14 14 18 14 19
NO. OF HOLES 4 4 4 4 4 4 4 4 4
1 ½" 
40 MM		 THICK 17 16 16 16 17.4 14 16 16 18
OD 140 133 133 140 127 127 150 130 140
PCD 105 98 98 105 98.4 98 110 100 105
HOLE DIA. 18 14 14 18 14 14 18 14 19
NO. OF HOLES 4 4 4 4 4 4 4 4 4
2" 
50MM		 THICK 19 19 19 19 19 16 18 16 20
OD 165 152 152 165 152.4 152 165 140 155
PCD 127 114 114 127 1 20.4 121 125 110 120
HOLE DIA. 18 18 18 18 18 18 18 14 19
NO. OF HOLES 4 4 4 4 4 4 4 4 4
2 ½"
65 MM		 THICK 19 19 19 19 22.2 17 21 16 22
OD 184 165 165 184 177.8 178 185 160 175
PCD 145 127 127 145 139.7 140 145 130 140
HOLE DIA. 18 18 18 18 18 18 18 14 19
NO. OF HOLES 4 4 4 8 4 4 4 4 4
3" 
80MM		 THICK 22 19 19 19 23.8 19 20 18 22
OD 203 184 184 203 190.5 191 200 190 185
PCD 165 145 145 165 152.4 152 160 150 150
HOLE DIA. 18 18 18 18 18 18 18 18 19
NO. OF HOLES 8 4 4 8 4 4 8 4 8
4" 
100MM		 THICK 25 22 22 22 23.8 24 20 18 24
OD 229 216 216 229 228.6 229 220 210 210
PCD 191 178 178 191 190.5 191 180 170 175
HOLE DIA. 18 18 18 18 18 18 18 18 19
NO. OF HOLES 8 4 4 8 8 8 8 4 8
6" 
150MM		 THICK 25 22 22 25 25.4 25 22 20 25
OD 305 279 279 305 279.4 279 280 265 280
PCD 260 235 235 260 241.3 241 240 225 240
HOLE DIA. 22 18 18 22 22 22 22 18 23
NO. OF HOLES 12 8 8 12 8 8 8 8 8