Gasket Dimensions for Flat Ring and Full Face Applications
ASME B16.21 Class 400
Nominal Bore |
Flat Ring and Full Face Gasket |
Flat Ring Gasket |
Full Face gasket |
Nominal Bore |
Inner Diameter |
Outer Diameter |
Outer Diameter |
Bolt Circle Diameter |
Diameter of Holes |
Number of Bolt Holes |
Inches |
mm |
Inches |
mm |
Inches |
mm |
Inches |
mm |
Inches |
mm |
1/2 |
27/32 |
21.4 |
2.12 |
53.8 |
3.75 |
95.3 |
2.62 |
66.5 |
0.62 |
15.7 |
4 |
1/2 |
3/4 |
1 1/16 |
27.0 |
2.62 |
66.5 |
4.62 |
117.3 |
3.25 |
82.6 |
0.75 |
19.1 |
4 |
3/4 |
1 |
1 5/16 |
33.3 |
2.88 |
73.2 |
4.88 |
124.0 |
3.50 |
88.9 |
0.75 |
19.1 |
4 |
1 |
1 1/4 |
1 21/32 |
42.1 |
3.25 |
82.6 |
5.25 |
133.4 |
3.88 |
98.6 |
0.75 |
19.1 |
4 |
1 1/4 |
1 1/2 |
1 29/32 |
48.4 |
3.75 |
95.3 |
6.12 |
155.4 |
4.50 |
114.3 |
0.88 |
22.4 |
4 |
1 1/2 |
2 |
2 3/8 |
60.3 |
4.38 |
111.3 |
6.50 |
165.1 |
5.00 |
127.0 |
0.75 |
19.1 |
8 |
2 |
2 1/2 |
2 7/8 |
73.0 |
5.12 |
130.0 |
7.50 |
190.5 |
5.88 |
149.4 |
0.88 |
22.4 |
8 |
2 1/2 |
3 |
3 1/2 |
88.9 |
5.88 |
149.4 |
8.25 |
209.6 |
6.62 |
168.1 |
0.88 |
22.4 |
8 |
3 |
3 1/2 |
4 |
101.6 |
6.38 |
162.1 |
9.00 |
228.6 |
7.25 |
184.2 |
1.00 |
25.4 |
8 |
3 1/2 |
4 |
4 1/2 |
114.3 |
7.00 |
177.8 |
10.00 |
254.0 |
7.88 |
200.2 |
1.00 |
25.4 |
8 |
4 |
5 |
5 9/16 |
141.3 |
8.38 |
212.9 |
11.00 |
279.4 |
9.25 |
235.0 |
1.00 |
25.4 |
8 |
5 |
6 |
6 5/8 |
168.3 |
9.75 |
247.7 |
12.50 |
317.5 |
10.62 |
269.7 |
1.00 |
25.4 |
12 |
6 |
8 |
8 5/8 |
219.1 |
12.00 |
304.8 |
15.00 |
381.0 |
13.00 |
330.2 |
1.12 |
28.4 |
12 |
8 |
10 |
10 3/4 |
273.1 |
14.12 |
358.6 |
17.50 |
444.5 |
15.25 |
387.4 |
1.25 |
31.8 |
16 |
10 |
12 |
12 3/4 |
323.9 |
16.50 |
419.1 |
20.50 |
520.7 |
17.75 |
450.9 |
1.38 |
35.1 |
16 |
12 |
14 |
14 |
355.6 |
19.00 |
482.6 |
23.00 |
584.2 |
20.25 |
514.4 |
1.38 |
35.1 |
20 |
14 |
16 |
16 |
406.4 |
21.12 |
536.4 |
25.50 |
647.7 |
22.50 |
571.5 |
1.50 |
38.1 |
20 |
16 |
18 |
18 |
457.2 |
23.38 |
593.9 |
28.00 |
711.2 |
24.75 |
628.7 |
1.50 |
38.1 |
24 |
18 |
20 |
20 |
508.0 |
25.50 |
647.7 |
30.50 |
774.7 |
27.00 |
685.8 |
1.62 |
41.1 |
24 |
20 |
24 |
24 |
609.6 |
30.25 |
768.4 |
36.00 |
914.4 |
32.00 |
812.8 |
1.88 |
47.8 |
24 |
24 |