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About O-Rings
More
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.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -20° to 250° | Black | 5 | 00000000 | 00000 |
Square-Profile Oil-Resistant Buna-N O-Rings
With flat edges on all four sides, 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’re made of Buna-N, which is resilient and offers excellent tear resistance. They resist hydraulic oils and motor oil.
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.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -30° to 212° | Black | 10 | 00000000 | 000000 |
X-Profile Oil-Resistant Buna-N O-Rings
Also known as Quattro Seals and X-rings, these X-profile O-rings have four points of contact for a better seal in dynamic applications than round-profile O-rings. They also require less compression to make a seal, so they offer a longer service life. These O-rings are made of Buna-N, which is resilient and tear resistant. They resist motor oil. 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 | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -30° to 225° | Black | 5 | 000000000 | 00000 |
Oil-Resistant Mil. Spec. Buna-N O-Rings
Choose these O-rings for their adherence to strict military standards for material and construction. Made of Buna-N, they are resilient and offer resistance to tearing, motor oil, ammonia, ethylene glycol, isopropyl alcohol, and mineral oil. These O-rings 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 | Temp. Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 65A (Medium) | ASTM D2000, MIL-I-45208, SAE AS3578, SAE AS568, SAE J200 | -20° to 250° | Black | 1 | 00000000 | 00000 |
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.: 3/16 Fractional (0.21"Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | 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.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 75A (Medium) | ASTM D2000, SAE AS568, SAE J200 | 0° to 400° | Black | 2 | 00000000 | 000000 |
Chemical-Resistant Hard Viton® Fluoroelastomer O-Rings
These hard O-rings offer better wear resistance than standard Viton® fluoroelastomer O-rings. They resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol. All have a round profile and are suitable for both 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 | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
Wd.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 90A (Hard) | ASTM D2000, SAE AS568, SAE J200 | -20° to 400° | Black | 2 | 00000000 | 000000 |
Chemical-Resistant Brown Viton® Fluoroelastomer O-Rings
Because one black O-ring looks just like another, these Viton® fluoroelastomer O-rings are brown for easy identification. They resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol. All have a round profile and are suitable for both static and dynamic sealing applications. O-rings have shelf life, cure date, and traceable lot number printed on the bag.
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.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 75A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -15° to 400° | Brown | 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.
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.:3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | 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.:3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | 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 withstand temperatures up to 400° F or 450° F. They have a round profile and are suitable for a wide range of static and dynamic sealing applications. All have a cure date and a traceable lot number printed on the bag.
Inch O-rings have a dash number. 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.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 70A (Medium) | ASTM D2000, FDA Compliant 21 CFR 177.2600, SAE AS568, SAE J200, USP VI Certified | -60° to 400° | Red | 5 | 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.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 50A (Soft) | 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.
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.: 3/16 Fractional (0.21" Actual) | |||||||||||
| 351 | 4 3/4 | 5 1/8 | 4.725" | 5.145" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -70° to 250° | Black | 10 | 00000000 | 000000 |
Oil-Resistant Buna-N Backup Rings
Made of Buna-N, these backup rings resist grease, petroleum fluids, and motor oil. Use them to extend the life of your O-rings and improve their performance in high-pressure applications.
For technical drawings and 3-D models, click on a part number.
| For Dash Number | ID | OD | Thick. | Hardness | Temperature Range, °F | Color | Pkg. Qty. | Pkg. | |
0.183" Wide | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 351 | 4.778" | 5.144" | 0.076" | Durometer 90A (Hard) | -40° to 250° | Black | 10 | 0000000 | 00000 |