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Carbon and Stainless Steel Flanges - ASME/ANSI Class 300
ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 300 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts
Carbon and Stainless Steel Flanges - ASME/ANSI Class 300:Class 300 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts for Weld neck, Threaded, Slip-on, Lap joint, Socket weld and Blind flanges.
Carbon and stainless steel qualities according ASME B16.5 Table 1A.
| Pipe Size (inches) |
Outside Diameter (inches) |
Inside Diameter (inches) |
Number of Bolt Holes | Bolt Hole Diameter (inches) 1) |
Bolt Circle (inches) |
1/2 |
3-3/4 |
0.88 |
4 |
5/8 |
2-5/8 |
3/4 |
4-5/8 |
1.09 |
4 |
3/4 |
3-1/4 |
1 |
4-7/8 |
1.36 |
4 |
3/4 |
3-1/2 |
1-1/4 |
5-1/4 |
1.70 |
4 |
3/4 |
3-7/8 |
1-1/2 |
6-1/8 |
1.95 |
4 |
7/8 |
4-1/2 |
2 |
6-1/2 |
2.44 |
8 |
3/4 |
5 |
2-1/2 |
7-1/2 |
2.94 |
8 |
7/8 |
5-7/8 |
3 |
8-1/4 |
3.57 |
8 |
7/8 |
6-5/8 |
3-1/2 |
9 |
4.07 |
8 |
7/8 |
7-1/4 |
4 |
10 |
4.57 |
8 |
7/8 |
7-7/8 |
5 |
11 |
5.66 |
8 |
7/8 |
9-1/4 |
6 |
12-1/2 |
6.72 |
12 |
7/8 |
10-5/8 |
8 |
15 |
8.72 |
12 |
1 |
13 |
10 |
17-1/2 |
10.88 |
16 |
1-1/8 |
15-1/4 |
12 |
20-1/2 |
12.88 |
16 |
1-1/4 |
17-3/4 |
14 |
23 |
14.14 |
20 |
1-1/4 |
20-1/4 |
16 |
25-1/2 |
16.16 |
20 |
1-3/8 |
22-1/2 |
18 |
28 |
18.18 |
24 |
1-3/8 |
24-3/4 |
20 |
30-1/2 |
20.20 |
24 |
1-3/8 |
27 |
24 |
36 |
24.25 |
24 |
1-5/8 |
32 |
1) Recommended bolts are 1/8 smaller than the nominal bolt hole diameters shown.