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ANSI CLASS 2500 Forged/Cast Steel Flanges
‧ Dimension Standard: ANSI B16.5, MSS SP44
- Specification
Unit: mm
Nominal
Pipe Size
Common Dimensions
Dia. of hub at bevel
Length thru hub
Dia. of bore
Outside dia. of flange
Thickness of flange
Diameter of hub at face
Diameter
of raised
face
Welding
neck
Slip-on, screwed, socket
Lap joint
Welding
neck
Slip-on
socket
Lap joing
O
Q
X
R
H
YW
YS
YL
BW
BS
BL
1/2
133.4
30.2
42.9
34.9
21.3
73.0
39.7
39.7
-
22.4
22.9
3/4
139.7
31.8
50.8
42.9
26.7
79.4
42.9
42.9
-
27.7
28.2
1
158.8
34.9
57.2
50.8
33.5
88.9
47.6
47.6
-
34.5
35.1
1-1/4
184.2
38.1
73.0
63.5
42.2
95.3
52.4
52.4
-
43.2
43.7
1-1/2
203.2
44.5
79.4
73.0
48.3
111.1
60.3
60.3
-
49.5
50.0
2
235.0
50.8
95.3
92.1
60.5
127.0
69.9
69.9
-
62.0
62.5
2-1/2
266.7
57.2
114.3
104.8
73.2
142.9
79.4
79.4
-
74.7
75.4
3
304.8
66.7
133.4
127.0
88.9
168.3
92.1
92.1
-
90.7
91.4
4
355.6
76.2
165.1
157.2
114.3
190.5
108.0
108.0
-
116.1
116.8
5
419.1
85.7
203.2
185.7
141.2
228.6
130.2
130.2
-
143.8
144.5
6
482.6
108.0
235.0
215.9
168.4
273.1
152.4
152.4
-
170.7
171.5
8
552.5
127.0
304.8
269.9
219.2
317.5
177.8
177.8
-
221.5
222.3
10
673.1
165.1
374.7
323.9
273.1
419.1
228.6
228.6
-
276.4
277.4
12
762.0
184.2
441.3
381.0
323.9
463.6
254.0
254.0
-
327.2
328.2
Unit: mm
Nominal
Pipe Size
Radius of fillet
Minimum thread length
Depth of socket
Drilling
Length of bolts
Dia. of bolt circle
Number of bolts
Diameter
of bolts
Diameter of bolt holes
Stud bolts
Male and female tongue and groove
1/4" raised face
Ring joint
r
T
D
C
1/2
3.2
28.6
-
82.6
4
19.1
22.2
120.7
120.7
114.3
3/4
3.2
31.8
-
95.3
4
19.1
22.2
120.7
120.7
114.3
1
3.2
34.9
-
108.0
4
22.2
25.4
133.4
133.4
127.0
1-1/4
4.8
38.1
-
130.2
4
25.4
28.6
146.1
152.4
139.7
1-1/2
6.4
44.5
-
146.1
4
25.4
28.6
165.1
161.9
158.8
2
7.9
50.8
-
171.5
8
28.6
31.8
171.5
177.8
165.1
2-1/2
7.9
57.2
-
196.9
8
28.6
31.8
190.5
196.9
184.2
3
9.5
63.5
-
228.6
8
31.8
34.9
215.9
222.3
209.6
4
11.1
69.9
-
273.1
8
38.1
41.3
247.7
260.4
235.0
5
11.1
76.2
-
323.9
8
44.5
47.6
292.1
311.2
285.8
6
12.7
82.6
-
368.3
8
50.8
54.0
342.9
355.6
336.6
8
12.7
95.3
-
438.2
12
50.8
54.0
381.0
393.7
374.7
10
12.7
108.0
-
539.8
12
63.5
66.7
482.6
508.0
476.3
12
12.7
120.7
-
619.1
12
69.9
73.0
533.4
558.8
527.1
Unit: mm
Nominal
Pipe Size
Counter bore screwed flange min.
Approximate weights (kg)
S
Welding neck
Slip on
Screwed
Socket welding
Lap joint
Blind
1/2
23.6
3.6
3.2
3.2
-
3.2
3.2
3/4
29.0
4.1
4.1
4.1
-
3.6
4.5
1
35.8
5.9
5.4
5.4
-
5.4
5.4
1-1/4
44.5
9.1
8.2
8.2
-
7.7
8.2
1-1/2
50.5
12.7
11.3
11.3
-
10.9
11.3
2
63.5
19.0
17.2
17.2
-
16.8
17.7
2-1/2
76.2
23.6
24.9
24.9
-
24.0
25.4
3
92.2
42.6
37.6
37.6
-
36.2
39.0
4
117.6
66.1
57.5
57.5
-
55.3
60.2
5
144.5
110.5
95.1
95.1
-
92.4
101.0
6
171.5
171.2
146.3
146.3
-
142.2
156.3
8
222.3
260.9
219.7
219.7
-
213.4
241.4
10
276.4
483.8
419.0
419.0
-
406.3
464.3
12
328.7
728.4
588.9
588.9
-
571.7
663.2
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