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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number  | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -40° to 215° | Black | 25 | 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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103"Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | 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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | Durometer 75A (Medium) | ASTM D2000, SAE AS568, SAE J200 | 0° to 400° | Black | 2 | 00000000 | 000000 |
Chemical-Resistant Soft Viton® Fluoroelastomer O-Rings
Softer than standard Viton® fluoroelastomer O-rings, these offer a better seal in low-pressure applications. They resist a wide range of chemicals, including sulfuric acid, butyl alcohol, and ethylene glycol. These O-rings have a round profile and are suitable for both static and dynamic sealing applications. All are sized to the SAE standard AS568. They have shelf life, cure date, and traceable lot number printed on the bag.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Temperature Range, °F | Color | Specifications Met | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | Durometer 60A (Soft) | -15° to 400° | White | FDA Compliant 21 CFR 177.2600, SAE AS568 | 1 | 0000000 | 000000 |
Square-Profile Chemical-Resistant Viton® Fluoroelastomer O-Rings
With flat edges on all four sides, these Viton® fluoroelastomer square-profile O-rings cover more surface than round-profile O-rings for a better seal in static applications, such as hose, pipe, and faucet connections. They resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol. All are sized to the SAE standard AS568.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.099" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.685" | Durometer 75A (Medium) | ASTM D2000, SAE AS568 | -10° to 400° | Black | 1 | 0000000 | 000000 |
Chemical-Resistant Mil. Spec. Viton® Fluoroelastomer O-Rings
Made of Viton® fluoroelastomer, these O-rings meet MIL-R-83248. They resist chemicals such as benzene, butyl alcohol, and ethylene glycol. 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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | Durometer 75A (Medium) | ASTM D2000, MIL-R-83248, SAE AS568, SAE J200 | 0° to 400° | Black | 2 | 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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Casing Hardness | Core Hardness | Specifications Met | Temperature Range, °F | Color | Each | |
Wd.:3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | 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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Casing Hardness | Core Hardness | Specifications Met | Temperature Range, °F | Color | Each | |
Wd.:3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | 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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | Durometer 70A (Medium) | ASTM D2000, FDA Compliant 21 CFR 177.2600, SAE AS568, SAE J200, USP VI Certified | -60° to 400° | Red | 1 | 00000000 | 00000 |
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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | Durometer 50A (Soft) | ASTM D2000, SAE AS568 | -85° to 400° | Red | 1 | 00000000 | 00000 |
Square-Profile High-Temperature Silicone O-Rings
Made of silicone, these square-profile O-rings withstand temperatures up to 400° F. They have flat edges on all four sides, so they cover more surface than round-profile O-rings for a better seal in static applications, such as hose, pipe, and faucet connections. All are sized to the SAE standard AS568.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.099" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.685" | Durometer 70A (Medium) | ASTM D2000, SAE AS568 | -60° 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.
Fractional | Actual | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/32 Fractional (0.103" Actual) | |||||||||||
| 173 | 8 1/2 | 8 11/16 | 8.487" | 8.693" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -70° to 250° | Black | 5 | 00000000 | 000000 |