Drilling Standards

Different Drilling Standards For 150# Flanges

Size
(NB)
Discription 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
T.11&17
BS 4504
T.6/3 OR
IS 6392
T.5&6
JIS
1/2" 15MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
13
114
83
18/4
13
95
67
14/4
13
95
67
14/4
13
95
67
14/4
11
88.9 
60.3
14/4
11
89
60
14/4
14
95
65
14/4
12
80
55
11/4
12
95
70
15/4
3/4" 20MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
13
114
83
18/4
13
102
73
14/4
13
102
73
14/4
13
102
73
14/4
12.7
98.4
69.8
14/4
11
98 
70
14/4
16
105
75
14/4
14
90
65
11/4
14
100
95
15/4
1"  25MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
14
121
87
18/4
13
114
83
14/4
13
114
83
14/4
13
121
87
18/4
14.2
107.9
79.3
14/4
11
108
79
14/4
16
115
85
14/4
14
100
75
11/4
16
125
90
19/4
1-1/4" 32MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
16
133
98
18/4
16
121
87
14/4
16
121
87
14/4
16
133
98
18/4
15.8
117.4
88.9
14/4
13
117
89
14/4
16
140
100
18/4
16
120
90
14/4
16
135
100
19/4
1-1/2" 40MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
17
140
105
18/4
16
133
98
14/4
16
133
98
14/4
16
140
105
18/4
17.4
127.0
98.4
14/4
14
127
98
14/4
16
150
110
18/4
16
130
100
14/4
18
140
105
19/4
2"  50MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
19
165
127 
18/4
19
152
114
18/4
19
152
114
18/4
19
165
127 
18/4
19
152.4
120.6
18/4
16
152
121
18/4
18
165
125
18/4
16
140
110
14/4
20
115
120
19/4
2-1/2" 65MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
19
184
145
18/8
19
165
127
18/4
19
165
127
18/4
19
184
145
18/8
22.2
177.8
139.7
18/4
17
178
140
18/4
21
185
145
18/4
16
160
130
14/4
22
175
140
19/4
3"  80MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
22
203
165
18/8
19
184
145
18/4
19
184
145
18/4
19
203
165
18/8
23.8
190.5
152.4
18/4
19
191
152
18/4
20
200
160
18/8
18
190
150
18/4
22
185
150
19/8
4" 100MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
25
229
191
18/8
22
216
178
18/4
22
216
178
18/8
22
229
191
18/8
23.8
228.6
190.5
18/8
24
229
191
18/8
20
220
180
18/8
18
210
170
18/4
24
210
175
19/8
6" 150MM THICK
OD.
P.C.D
HOLE DIA./NO OF HOLES
25
305
260
22/12
22
279
235
18/8
22
279
235
22/8
25
305
260
22/12
25.4
279.4
241.3
22/8
25
279
241
22/8
22
280
240
22/8
20
265
225
18/8
25
280
240
23/8

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