ASME B16.36-2006 ORIFICE FLANGES
CLASS 300
CLASS 600
CLASS 900
CLASS 1500
CLASS 2500
NOMINAL PIPE SIZE
THICKNESS MIN
LENGTH THRU HUB W/NECK
THICKNESS MIN
LENGTH THRU HUB W/NECK
THICKNESS MIN
LENGTH THRU HUB W/NECK
THICKNESS MIN
LENGTH THRU HUB W/NECK
THICKNESS MIN
LENGTH THRU HUB W/NECK
NOMINAL PIPE SIZE
MM
INCH
T
LTB
T
LTB
T
LTB
T
LTB
T
LTB
MM
INCH
25
1
36.6
83
36.6
83
38.1
90
38.1
90
38.1
99
25
1
40
1 1/2
36.6
86
36.6
86
38.1
96
38.1
96
44.5
118
40
1 1/2
50
2
36.6
86
36.6
86
38.1
109
38.1
109
50.8
134
50
2
65
2 1/2
36.6
89
36.6
89
41.3
112
41.3
112
57.2
150
65
2 1/2
80
3
36.6
89
36.6
89
38.1
109
47.7
124
66.7
175
80
3
100
4
36.6
92
38.1
109
44.5
121
54
131
76.2
197
100
4
150
6
36.6
100
47.8
124
55.6
147
82.6
178
108
280
150
6
200
8
39.7
112
55.6
140
63.5
169
92.1
220
127
325
200
8
250
10
46.1
118
63.5
159
69.9
191
108
261
165.1
426
250
10
300
12
49.3
131
66.5
163
79.2
207
123.9
290
184
171
300
12
350
14
52.4
143
69.9
172
85.9
220
133.4
305
350
14
400
16
55.6
146
76.2
185
88.9
223
146.1
318
400
16
450
18
58.8
159
82.6
191
101.6
236
162
334
450
18
500
20
62
162
88.9
197
108
255
177.8
363
500
20
600
24
68.3
169
101.6
210
139.7
299
203.2
413
600
24
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