About O-Rings
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Oil-Resistant Buna-N O-Rings
Made of Buna-N, these O-rings resist grease, hydraulic oil, and motor oil—plus mild chemicals and water. However, Buna-N is not for use with brake fluid. These O-rings are commonly used to create multidirectional seals between two parts in power transmission assemblies, hydraulic cylinders, and pneumatic cylinders. With a round profile, they resist compression and tearing to keep their shape over time, so they’re reusable. All have shelf life, cure date, and a traceable lot number printed on the bag. Many meet ASTM D2000 and SAE J200, international standards for rubber products.
Inch O-rings have a dash number and are sized to the SAE standard AS568.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number  | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -40° to 250° | Black | 2 | 00000000 | 000000 |
Oil- and Abrasion-Resistant Polyurethane O-Rings
More abrasion resistant than Buna-N O-rings, these polyurethane O-rings resist mineral oil, motor oil, and ethylene glycol. They have a round profile and are suitable for a wide range of static and dynamic sealing applications. All are sized to the SAE standard AS568.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 1/4 Fractional (0.275"Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -40° to 200° | Black | 1 | 00000000 | 000000 |
Chemical-Resistant Viton® Fluoroelastomer O-Rings
These Viton® fluoroelastomer O-rings resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol. They have a round profile and are suitable for both static and dynamic sealing applications.
Inch O-rings have a dash number and are sized to the SAE standard AS568.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 75A (Medium) | ASTM D2000, SAE AS568, SAE J200 | 0° to 400° | Black | 1 | 00000000 | 000000 |
Ultra-Chemical-Resistant FEP-Encapsulated Viton® Fluoroelastomer O-Rings
If the FEP casing on these O-rings wears away, the Viton® fluoroelastomer core will continue to ward off chemicals. They are just as chemical resistant as PTFE O-rings, but the core is soft to make them more compressible. These O-rings resist acetone, solvents, methanol, and boric acid. They have a round profile and are suitable for a wide range of static and dynamic sealing applications. All are sized to the SAE standard AS568.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Casing Hardness | Core Hardness | Specifications Met | Temperature Range, °F | Color | Each | |
Wd.:1/4 Fractional (0.275" Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 55D (Hard) | Durometer 75A (Medium) | ASTM D2000, ASTM D2116, SAE AS568, SAE J200 | -15° to 400° | Clear with Black Inner Ring | 000000000 | 000000 |
Ultra-Chemical-Resistant FEP-Encapsulated Silicone O-Rings
The FEP casing on these O-rings provides the same level of resistance to harsh chemicals as PTFE O-rings, but the silicone core is soft to make these O-rings more compressible. They resist acetone, solvents, methanol, and boric acid. All have a round profile and are suitable for a wide range of static and dynamic sealing applications. These O-rings are sized to the SAE standard AS568.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Casing Hardness | Core Hardness | Specifications Met | Temperature Range, °F | Color | Each | |
Wd.:1/4 Fractional (0.275" Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 55D (Hard) | Durometer 70A (Medium) | ASTM D2000, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600, SAE AS568, SAE J200 | -75° to 400° | Clear with Red Inner Ring | 00000000 | 000000 |
High-Temperature Silicone O-Rings
These silicone O-rings have a round profile and are suitable for a wide range of static sealing applications. All have a cure date and a traceable lot number printed on the bag.
Inch O-rings have a dash number. They withstand temperatures up to 400° F. USP VI Certified, they meet testing requirements for material quality.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 70A (Medium) | ASTM D2000, FDA Compliant 21 CFR 177.2600, SAE AS568, SAE J200, USP VI Certified | -60° to 400° | Red | 1 | 00000000 | 000000 |
High-Temperature Soft Silicone O-Rings
Able to withstand temperatures up to 400° F, these silicone O-rings are softer than standard silicone O-rings for a better seal in low-pressure applications. They have a round profile and are suitable for a wide range of static and dynamic sealing applications. All are sized to the SAE standard AS568.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 50A (Soft) | ASTM D2000, SAE AS568 | -85° to 400° | Red | 1 | 00000000 | 000000 |
Water- and Steam-Resistant EPDM O-Rings
These EPDM O-rings resist water, steam, ethanol, and ethylene glycol. They have a round profile and are suitable for a wide range of static and dynamic sealing applications. All are sized to the SAE standard AS568.
For technical drawings and 3-D models, click on a part number.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||
| 473 | 24 | 24 1/2 | 23.94" | 24.49" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -70° to 250° | Black | 1 | 00000000 | 000000 |