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. They resist compression and tearing to keep their shape over time. All have shelf life, a cure date, and a traceable lot number printed on the package.
Fractional | Actual | Pkg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number  | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | 1-9 | 10-49 | 50-Up | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||||
| 424 | 4 3/8 | 4 7/8 | 4.35" | 4.9" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -40° to 250° | Black | 5 | 00000000 | 00000 | 00000 | 00000 |
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.: 1/4 Fractional (0.275" Actual) | |||||||||||
| 424 | 4 3/8 | 4 7/8 | 4.35" | 4.9" | Durometer 75A (Medium) | ASTM D2000, SAE AS568, SAE J200 | 0° to 400° | Black | 2 | 00000000 | 000000 |
High-Temperature Parker S1138 Silicone O-Rings
Use these O-rings in temperatures up to 400° F. Made of Parker S1138 silicone, they’re pure enough for food or pharmaceutical applications—they’re USP VI certified. These O-rings are also FDA compliant for direct contact with food. All come with a cure date and a traceable lot number printed on the bag.
Fractional | Actual | Pkg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | 1-9 | 10-49 | 50-Up | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||||
| 424 | 4 3/8 | 4 7/8 | 4.35" | 4.9" | Durometer 70A (Medium) | ASTM D2000, FDA Compliant 21 CFR 177.2600, SAE J200, USP VI Certified | -60° to 400° | Red | 5 | 00000000 | 000000 | 000000 | 000000 |
High-Temperature Soft Silicone O-Rings
Easier to compress than standard silicone O-rings, these O-rings create a better seal in enclosures, reservoirs, and other low-pressure equipment. They can withstand temperatures up to 400° F. All have shelf life, a cure date, and a traceable lot number printed on the bag.
Fractional | Actual | Pkg. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | 1-9 | 10-Up | |
Wd.: 1/4 Fractional (0.275" Actual) | ||||||||||||
| 424 | 4 3/8 | 4 7/8 | 4.35" | 4.9" | Durometer 50A (Soft) | ASTM D2000, SAE AS568 | -85° to 400° | Red | 1 | 00000000 | 00000 | 00000 |
High-Temperature Silicone O-Rings
Made of silicone, these O-rings can withstand temperatures up to 400° F or higher. They're FDA compliant for direct contact with food, so they're often used on hot food lines. They're also used to seal HVAC systems. All come with a cure date and a traceable lot number printed on the bag.
Fractional | Actual | Pkg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | 1-9 | 10-49 | 50-Up | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||||
| 424 | 4 3/8 | 4 7/8 | 4.35" | 4.9" | Durometer 70A (Medium) | ASTM D2000, FDA Compliant 21 CFR 177.2600, SAE AS568, SAE J200 | -65° to 400° | Red | 2 | 00000000 | 00000 | 00000 | 00000 |
Water- and Steam-Resistant Parker E0603 EPDM O-Rings
Trusted for their quality and consistency, these E0603 EPDM O-rings resist water, steam, and glycol-based fluids, including brake fluid. They’re often used to seal plumbing and refrigeration systems, since they won’t swell or break down in moist environments. All have a cure date and traceable lot number printed on the bag.
Fractional | Actual | Pkg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | 1-9 | 10-49 | 50-Up | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||||
| 424 | 4 3/8 | 4 7/8 | 4.35" | 4.9" | Durometer 70A (Medium) | ASTM D2000, SAE J200 | -70° to 250° | Black | 1 | 00000000 | 00000 | 00000 | 00000 |
Water- and Steam-Resistant EPDM O-Rings
Made of EPDM, these O-rings have excellent resistance to water, steam, and glycol-based fluids, including brake fluid. They’re often used to seal plumbing and refrigeration systems, since they won’t swell or break down in moist environments. All have shelf life, a cure date, and a traceable lot number printed on the bag.
Fractional | Actual | Pkg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dash Number | ID | OD | ID | OD | Hardness | Specifications Met | Temperature Range, °F | Color | Pkg. Qty. | 1-9 | 10-49 | 50-Up | |
Wd.: 1/4 Fractional (0.275" Actual) | |||||||||||||
| 424 | 4 3/8 | 4 7/8 | 4.35" | 4.9" | Durometer 70A (Medium) | ASTM D2000, SAE AS568, SAE J200 | -65° to 300° | Black | 1 | 00000000 | 00000 | 00000 | 00000 |