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ASME B16.5 Class 400 Flange

1. Technical Drawings for ASME B16.5 Class 400 Flanges

Drawing of ASME B16.5 Class 400 weld neck flange, raised face(RF).

Drawing of ASME B16.5 Class 400 weld neck flange, raised face(RF).

Drawing of ASME B16.5 Class 400 blind flange, raised face(RF).

Drawing of ASME B16.5 Class 400 blind flange, raised face(RF).

Drawing of ASME B16.5 Class 400 slip on flange, raised face(RF).

Drawing of ASME B16.5 Class 400 slip on flange, raised face(RF).

Drawing of ASME B16.5 Class 400 threaded flange, raised face(RF).

Drawing of ASME B16.5 Class 400 threaded flange, raised face(RF).

Drawing of ASME B16.5 Class 400 lap joint flange.

Drawing of ASME B16.5 Class 400 lap joint flange.

2. Flange and Bolting Dimensions for Class 400

All dimensions are provided in both mm and inch units. The two unit system shall be used respectively and exclusively. There are 5 types of ASME B16.5 Class 400 flanges: weld neck, blind, threaded, slip on and lap joint. The bolting of Class 400 flanges shall be furnished by stud bolt with nuts. The Class 400 flange has a 7 mm(0.25 inch) raised face which is additional to the minimum flange-thickness. For sizes of 1/2″~3-1/2″, the dimensions of ASME B16.5 Class 400 flange are the same as that of Class 600. Tables below are applicable for flanges with RF end facing. Contact us to obtain the data for other end facings.

NPSO
mm
inch
T
mm
inch
X
mm
inch
Ah
mm
inch
ro
mm
inch
Q
mm
inch
1/295
3.75
14.3
0.56
38
1.50
21.3
0.84
3
0.12
23.6
0.93
3/4115
4.62
15.9
0.62
48
1.88
26.7
1.05
3
0.12
29.0
1.14
1125
4.88
17.5
0.69
54
2.12
33.4
1.32
3
0.12
35.8
1.41
1-1/4135
5.25
20.7
0.81
64
2.50
42.2
1.66
5
0.19
44.4
1.75
1-1/2155
6.12
22.3
0.88
70
2.75
48.3
1.90
6
0.25
50.6
1.99
2165
6.50
25.4
1.00
84
3.31
60.3
2.38
8
0.31
63.5
2.50
2-1/2190
7.50
28.6
1.12
100
3.94
73.0
2.88
8
0.31
76.2
3.00
3210
8.25
31.8
1.25
117
4.62
88.9
3.50
10
0.38
92.2
3.63
3-1/2230
9.00
35.0
1.38
133
5.25
101.6
4.00
10
0.38
104.9
4.13
4255
10.00
35.0
5.75
146
5.75
114.3
4.50
11
0.44
117.6
4.63
5280
11.00
38.1
7.00
178
7.00
141.3
5.56
11
0.44
144.4
5.69
6320
12.50
41.3
8.12
206
8.12
168.3
6.63
13
0.50
171.4
6.75
8380
15.00
47.7
10.25
260
10.25
219.1
8.63
13
0.50
222.2
8.75
10445
17.50
54.0
12.62
321
12.62
273.0
10.75
13
0.50
276.2
10.88
12520
20.50
57.2
14.75
375
14.75
323.8
12.75
13
0.50
328.6
12.94
14585
23.00
60.4
16.75
425
16.75
355.6
14.00
13
0.50
360.4
14.19
16650
25.50
63.5
19.00
483
19.00
406.4
16.00
13
0.50
411.2
16.19
18710
28.00
66.7
21.00
533
21.00
457.0
18.00
13
0.50
462.0
18.19
20775
30.50
69.9
23.12
587
23.12
508.0
20.00
13
0.50
512.8
20.19
24915
36.00
76.2
27.62
702
27.62
610.0
24.00
13
0.50
614.4
24.19
*O:outside diameter of flange; T:minimum flange thickness(T=To=T1); X:diameter at hub.
*Ah:hub diameter at the beginning of chamfer for W/N; ro: corner bore radius of lapped flange; Q:minimum counterbore of threaded flange.

NPSY1
mm
inch
Y2
mm
inch
Y3
mm
inch
Ta
mm
inch
B1
mm
inch
B2
mm
inch
B3
mm
inch
1/252
2.06
22
0.88
22
0.88
16
0.62
-22.2
0.88
22.9
0.90
3/457
2.25
25
1.00
25
1.00
16
0.62
-27.7
1.09
28.2
1.11
162
2.44
27
1.06
27
1.06
18
0.69
-
34.5
1.36
34.9
1.38
1-1/467
2.62
29
1.12
29
1.12
21
0.81
-43.2
1.70
43.7
1.72
1-1/270
2.75
32
1.25
32
1.25
23
0.88
-49.5
1.95
50.0
1.97
273
2.88
37
1.44
37
1.44
29
1.12
-61.9
2.44
62.5
2.46
2-1/279
3.12
41
1.62
41
1.62
32
1.25
-74.6
2.94
75.4
2.97
383
3.25
46
1.81
46
1.81
35
1.38
-90.7
3.57
91.4
3.60
3-1/286
3.38
49
1.94
49
1.94
40
1.56
-103.4
4.07
104.1
4.10
489
3.50
51
2.00
51
2.00
37
1.44
-116.1
4.57
116.8
4.60
5102
4.00
54
2.12
54
2.12
43
1.69
-143.8
5.66
144.5
5.69
6103
4.06
57
2.25
57
2.25
46
1.81
-170.7
6.72
171.4
6.75
8117
4.62
68
2.69
68
2.69
51
2.00
-221.5
8.72
222.2
8.75
10124
4.88
73
4.00
102
4.00
56
2.19
-276.2
10.88
277.4
10.92
12137
5.38
79
4.25
108
4.25
61
2.38
-327.0
12.88
328.2
12.92
14149
5.88
84
4.62
117
4.62
64
2.50
-359.2
14.14
360.2
14.18
16152
6.00
94
5.00
127
5.00
69
2.69
-410.5
16.16
411.2
16.19
18165
6.50
98
5.38
137
5.38
70
2.75
-461.8
18.18
462.3
18.20
20168
6.62
102
5.75
146
5.75
74
2.88
-513.1
20.20
514.4
20.25
24175
6.88
114
6.25
159
6.25
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; Y3:length through hub of lapped flange.
*Ta:minimum thread length of threaded flange; B1:bore diameter of welding neck flange which shall be specified by purchaser.
*B2:bore diameter of slip on flange; B3:bore diameter of lap joint(lapped) flange.

NPSW
mm
inch
R
mm
inch
d
inch
ndo
inch
LSRF
mm
inch
LSRJ
mm
inch
LTG
mm
inch
1/266.7
3.75
34.9
1.38
5/841/275
3.00
75
3.00
70
2.75
3/482.6
4.62
42.9
1.69
3/445/890
3.50
90
3.50
85
3.25
188.9
4.88
50.8
2.00
3/445/890
3.50
90
3.50
85
3.25
1-1/498.4
5.25
63.5
2.50
3/445/895
3.75
95
3.75
90
3.50
1-1/2114.3
6.12
73.0
2.88
7/843/4110
4.25
110
4.25
100
4.00
2127.0
6.50
92.1
3.62
3/485/8110
4.25
110
4.25
100
4.00
2-1/2149.2
7.50
104.8
4.12
7/883/4120
4.75
120
4.75
115
4.50
3168.3
8.25
127.0
5.00
7/883/4125
5.00
125
5.00
120
4.75
3-1/2184.2
9.00
139.7
5.50
187/8140
5.50
140
5.50
135
5.25
4200.0
7.88
157.2
6.19
187/8140
5.50
140
5.50
135
5.25
5235.0
9.25
185.7
7.31
187/8145
5.75
145
5.75
135
5.25
6269.9
10.62
215.9
8.50
1127/8150
6.00
150
6.00
145
5.75
8330.0
13.00
269.9
10.62
1 1/8121170
6.75
170
6.75
165
6.50
10387.4
15.25
323.8
12.75
1 1/4161 1/8190
7.50
190
7.50
185
7.25
12450.8
17.75
381.0
15.00
1 3/8161 1/4205
8.00
205
8.00
195
7.75
14514.4
20.25
412.8
16.25
1 3/8201 1/4210
8.25
210
8.25
205
8.00
16571.5
22.50
469.9
18.50
1 1/2201 3/8220
8.75
220
8.75
215
8.50
18628.6
24.75
533.4
21.00
1 1/2241 3/8230
9.00
230
9.00
220
8.75
20685.8
27.00
584.2
23.00
1 5/8241 1/2240
9.50
250
9.75
235
9.25
24812.8
32.00
692.2
27.25
1 7/8241 3/4265
10.50
280
11.00
260
10.25
*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 bolt for raised face; LSRJ:length of stud bolt for ring joint; LTG:length of stud bolt for male/ female tongue and groove.

Stud bolt with nuts for ASME B16.5 Class 400 flanges.

Stud bolt with nuts for ASME B16.5 Class 400 flanges.

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