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For over 60 years, Sealing Devices has been a proud manufacturer, fabricator, and distributor of industry-leading sealing solutions. We are ethical in our approach to everything we do and strive to be your trusted partner for all of your seals and gasketing needs. Learn more about what sets us apart.
Sealing Devices maintains close relationships with the world’s leading suppliers of seals, gaskets, and materials. We source the best products from the most reliable manufacturers to help you get the most value out of your applications. Explore our suppliers here to learn more.
Find the Right Fit for Your Application
Proper sizing is key to maintaining an effective seal. Use this chart to determine the right ring gasket size for your ANSI/ASME Class 300 pipe flanges. If you need further assistance in choosing the right gasket for your application, our applications engineers are here to help.
| Nominal Pipe Size | Gasket I.D. | Gasket O.D. |
|---|---|---|
| 1/2" | 27/32" | 2 1/8" |
| 3/4" | 1 1/16" | 2 5/8" |
| 1" | 1 5/16" | 2 7/8" |
| 1 1/4" | 1 21/32" | 3 1/4" |
| 1 1/2" | 1 29/32" | 3 3/4" |
| 2" | 2 3/8" | 4 3/8" |
| 2 1/2" | 2 7/8" | 5 1/8" |
| 3" | 3 1/2" | 5 7/8" |
| 3 1/2" | 4" | 6 1/2" |
| 4" | 4 1/2" | 7 1/8" |
| 4 1/2" | 5" | 7 5/8" |
| 5" | 5 9/16" | 8 1/2" |
| 6" | 6 5/8" | 9 7/8" |
| 7" | 7 5/8" | 10 7/8" |
| 8" | 8 5/8" | 12 1/8" |
| 10" | 10 3/4" | 14 1/4" |
| 12" | 12 3/4" | 16 5/8" |
| 14" | 14" | 19 1/8" |
| 15" | 15" | 20 1/8" |
| 16" | 16" | 21 1/4" |
| 18" | 18" | 23 1/2" |
| 20" | 20" | 25 3/4" |
| 22" | 22" | 27 5/8" |
| 24" | 24" | 30 1/2" |
| 30" | 30" | 37 1/2" |
| 36" | 36" | 44" |
| 42" | 42" | 50 3/4" |
| 48" | 48" | 58 3/4" |
Standard thickness is 1/16″ and 1/8″. Other thicknesses available by special order.