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ASME B16.5 Class 300 Flange

1. Technical Drawings for ASME B16.5 Class 300 Flanges

Drawing of ASME B16.5 Class 300 weld neck flange, raised face(RF).

Drawing of ASME B16.5 Class 300 weld neck flange, raised face(RF).

Drawing of ASME B16.5 Class 300 blind flange, raised face(RF).

Drawing of ASME B16.5 Class 300 blind flange, raised face(RF).

Drawing of ASME B16.5 Class 300 slip on flange, raised face(RF).

Drawing of ASME B16.5 Class 300 slip on flange, raised face(RF).

Drawing of ASME B16.5 Class 300 socket welding flange, raised face(RF).

Drawing of ASME B16.5 Class 300 socket welding flange, raised face(RF).

Drawing of ASME B16.5 Class 300 threaded flange, raised face(RF).

Drawing of ASME B16.5 Class 300 threaded flange, raised face(RF).

Drawing of ASME B16.5 Class 300 lap joint flange.

Drawing of ASME B16.5 Class 300 lap joint flange.

2. Flange and Bolting Dimensions for Class 300

All dimensions are provided in both mm and inch units. The two unit system shall be used respectively and exclusively. The bolting of Class 300 flanges can be furnished by stud bolt with nuts or machine bolt with nuts. Stud bolts can be used for RF or RTJ end facing while machine bolts are only used for RF facing. Dimensions of ASME B16.5 Class 300 flanges in below tables shall be furnished with RF facing. For other facings, please contact us for detailed specification. The same as Class 150, the Class 300 flange has a 2 mm(0.06 inch) raised face which is additional to the minimum flange-thickness.

NPSO
mm
inch
To
mm
inch
T1
mm
inch
X
mm
inch
Ah
mm
inch
ro
mm
inch
Do
mm
inch
1/295
3.75
12.7
0.50
14.3
0.56
38
1.50
21.3
0.84
3
0.12
10
0.38
3/4115
4.62
14.3
0.56
15.9
0.62
48
1.88
26.7
1.05
3
0.12
11
0.44
1125
4.88
15.9
0.62
17.5
0.69
54
2.12
33.4
1.32
3
0.12
13
0.50
1-1/4135
5.25
17.5
0.69
19.1
0.75
64
2.50
42.2
1.66
5
0.19
14
0.56
1-1/2155
6.12
19.1
0.75
20.7
0.81
70
2.75
48.3
1.90
6
0.25
16
0.62
2165
6.50
20.7
0.81
22.3
0.88
84
3.31
60.3
2.38
8
0.31
17
0.69
2-1/2190
7.50
23.9
0.94
25.4
1.00
100
3.94
73.0
2.88
8
0.31
19
0.75
3210
8.25
27.0
1.06
28.6
1.12
117
4.62
88.9
3.50
10
0.38
21
0.81
3-1/2230
9.00
28.6
1.12
30.2
1.19
133
5.25
101.6
4.00
10
0.38
4255
10.00
30.2
1.19
31.8
1.25
146
5.75
114.3
4.50
11
0.44
5280
11.00
33.4
1.31
35.0
1.38
178
7.00
141.3
5.56
11
0.44
6320
12.50
35.0
1.38
36.6
1.44
206
8.12
168.3
6.63
13
0.50
8380
15.00
39.7
1.56
41.3
1.62
260
10.25
219.3
8.63
13
0.50
10445
17.50
46.1
1.81
47.7
1.88
321
12.62
273.0
10.75
13
0.50
12520
20.50
49.3
1.94
50.8
2.00
375
14.75
323.8
12.75
13
0.50
14585
23.00
52.4
2.06
54.0
2.12
425
16.75
355.6
14.00
13
0.50
16650
25.50
55.6
2.19
57.2
2.25
483
19.00
406.4
16.00
13
0.50
18710
28.00
58.8
2.31
60.4
2.38
533
21.00
457.0
18.00
13
0.50
20775
30.50
62.0
2.44
63.5
2.50
587
23.12
508.0
20.00
13
0.50
24915
36.00
68.3
2.69
69.9
2.75
702
27.62
610.0
24.00
13
0.50
*O:outside diameter of flange; To:minimum flange thickness of W/N, S/O, Blind, THD, S/W; T1:minimum thickness of lap joint flange;
*X:diameter at hub; Ah:hub diameter at the beginning of chamfer for W/N; ro: corner bore radius of lapped flange; Do:depth of socket.

NPSY1
mm
inch
Y2
mm
inch
Y3
mm
inch
Ta
mm
inch
B1
mm
inch
B2
mm
inch
B3
mm
inch
1/251
2.00
21
0.81
22
0.88
16
0.62
15.8
0.62
22.2
0.88
22.9
0.90
3/456
2.19
24
0.94
25
1.00
16
0.62
20.9
0.82
27.7
1.09
28.2
1.11
160
2.38
25
1.00
27
1.06
18
0.69
26.6
1.05
34.5
1.36
34.9
1.38
1-1/464
2.50
25
1.00
27
1.06
21
0.81
35.1
1.38
43.2
1.70
43.7
1.72
1-1/267
2.63
29
1.13
30
1.19
23
0.88
40.9
1.61
49.5
1.95
50.0
1.97
268
2.69
32
1.25
33
1.31
29
1.12
52.5
2.07
61.9
2.44
62.5
2.46
2-1/275
2.94
37
1.44
38
1.50
32
1.25
62.7
2.47
74.6
2.94
75.4
2.97
378
3.06
41
1.63
43
1.69
32
1.25
77.9
3.07
90.7
3.57
91.4
3.60
3-1/279
3.13
43
1.69
44
1.75
37
1.44
90.1
3.55
103.4
4.07
104.1
4.10
484
3.32
46
1.82
48
1.88
37
1.44
102.3
4.03
116.1
4.57
116.8
4.60
597
3.82
49
1.94
51
2.00
43
1.69
128.2
5.05
143.8
5.66
144.4
5.69
697
3.82
51
2.00
52
2.06
47
1.81
154.1
6.07
170.7
6.72
171.4
6.75
8110
4.32
60
2.38
62
2.44
51
2.00
202.7
7.98
221.5
8.72
222.2
8.75
10116
4.56
65
2.56
95
3.75
56
2.19
254.6
10.02
276.2
10.88
277.4
10.92
12129
5.06
71
2.82
102
4.00
61
2.38
304.8
12.00
327.0
12.88
328.2
12.92
14141
5.56
75
2.94
111
4.38
64
2.50
359.2
14.14
360.2
14.18
16144
5.69
81
3.19
121
4.75
69
2.69
410.5
16.16
411.2
16.19
18157
6.19
87
3.44
130
5.12
70
2.75
461.8
18.18
462.3
18.20
20160
6.32
94
3.69
140
5.50
74
2.88
513.1
20.20
514.4
20.25
24167
6.56
105
4.13
152
6.00
83
3.25
616.0
24.25
616.0
24.25
*Y1:length through hub of welding neck flange; Y2:length through hub of threaded, S/O and S/W flange; Y3:length through hub of lapped flange.
*Ta:minimum thread length of threaded flange; B1:bore diameter of welding neck flange or lower part of socket welding flange.
*B2:bore diameter of slip on flange or upper part of socket welding flange; B3:bore diameter of lap joint(lapped) flange.

NPSW
mm
inch
R
mm
inch
d
inch
ndo
inch
LSRF
mm
inch
LSRTJ
mm
inch
LMRF
mm
inch
1/266.7
2.62
34.9
1.38
5/841/265
2.50
75
3.00
55
2.25
3/482.6
3.25
42.9
1.69
3/445/875
3.00
90
3.50
65
2.50
188.9
3.50
50.8
2.00
3/445/875
3.00
90
3.50
65
2.50
1-1/498.4
3.88
63.5
2.50
3/445/885
3.25
95
3.75
70
2.75
1-1/2114.3
4.50
73.0
2.88
7/843/490
3.50
100
4.00
75
3.00
2127.0
5.00
92.1
3.62
3/485/890
3.50
100
4.00
75
3.00
2-1/2149.2
5.88
104.8
4.12
7/883/4100
4.00
115
4.50
85
3.25
3168.3
6.62
127.0
5.00
7/883/4110
4.25
120
4.75
90
3.50
3-1/2184.2
7.25
139.7
5.50
7/883/4110
4.25
125
5.00
95
3.75
4200.0
7.88
157.2
6.19
7/883/4115
4.50
125
5.00
95
3.75
5235.0
9.25
185.7
7.31
7/883/4120
4.75
135
5.25
110
4.25
6269.9
10.62
215.9
8.50
7/8123/4120
4.75
140
5.50
110
4.25
8330.2
13.00
269.9
10.62
1127/8140
5.50
150
6.00
120
4.75
10387.4
15.25
323.8
12.75
1 1/8161160
6.25
170
6.75
140
5.50
12450.8
17.75
381.0
15.00
1 1/4161 1/8170
6.75
185
7.25
145
5.75
14514.4
20.25
412.8
16.25
1 1/4201 1/8180
7.00
190
7.50
160
6.25
16571.5
22.50
469.9
18.50
1 3/8201 1/4190
7.50
205
8.00
165
6.50
18628.6
24.75
533.4
21.00
1 3/8241 1/4195
7.75
210
8.25
170
6.75
20685.8
27.00
584.2
23.00
1 3/8241 1/4205
8.00
220
8.75
185
7.25
24812.8
32.00
692.2
27.25
1 5/8241 1/2230
9.00
255
10.00
205
8.00
*W:diameter of bolt circle; d:diameter of bolt holes; n:number of bolts; do:diameter of bolts; R:outside diameter of RF.
*LSRF:length of stud bolts for raised face; LSRTJ:length of stud bolts for ring joint; LMRF:length of machine bolts for raised face.

Stud bolt with nuts & machine bolt with nuts for ASME B16.5 Class 300 flanges.

Stud bolt with nuts & machine bolt with nuts for ASME B16.5 Class 300 flanges.

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