O-Rings & Rubber Washers
O-rings are the most widely used sealing solution in modern engineering, providing reliable fluid and gas containment in critical applications across virtually every industry. Our comprehensive selection includes standard AS568 and JIS B2401 specification O-rings, specialty compounds for extreme conditions, and O-ring cord for custom fabrication.
These essential sealing components serve in hydraulic systems where they prevent fluid leakage under high pressure, pneumatic applications requiring consistent performance, automotive engines and transmissions demanding durability, and aerospace systems where failure is not an option. The critical sealing function of O-rings makes them indispensable in applications ranging from medical devices to industrial machinery.
Available in multiple material options including nitrile (Buna-N) for general-purpose oil resistance, EPDM for weathering and ozone resistance, fluoroelastomer (Viton®) for chemical and high-temperature applications, and silicone for food-grade and low-temperature requirements. Each material is selected based on specific application requirements including temperature range, chemical compatibility, and pressure conditions.
Beyond standard catalog items, our custom O-ring manufacturing capabilities allow us to create specialized seals for unique applications, including non-standard sizes, custom compounds, and proprietary designs to meet your specific engineering requirements.
O-Ring Selection Guide
How to Measure O-Rings
Measure the internal diameter of the O-ring groove. This is the most critical dimension for proper sealing.
Measure the thickness of the O-ring when uncompressed. Standard sizes are 1/16", 3/32", 1/8", etc.
ID + (2 × CS). This dimension helps verify the O-ring sizing.
Material Compatibility
Excellent oil resistance, good compression set, cost-effective for general use.
Superior weathering resistance, good ozone resistance, suitable for water applications.
Outstanding chemical resistance, high temperature performance, excellent for fuels and oils.
Wide temperature range, FDA-compliant grades available, good for food and medical applications.
Temperature Considerations
- Nitrile: -40°C to +120°C
- EPDM: -50°C to +150°C
- Viton®: -20°C to +200°C
- Silicone: -60°C to +200°C
Pressure Ratings
- Low Pressure: < 150 psi
- Medium Pressure: 150-1000 psi
- High Pressure: > 1000 psi
- Ultra High: > 5000 psi
When to Use O-Ring Cord
- • Non-standard sizes
- • Large cross-sections
- • Custom profiles
- • Cost-effective for large quantities
AS568 O-Rings
AS568 O-Rings
Product Code: oRing1
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JIS B2401 O-Rings
JIS B2401 O-Rings
Product Code: oring2
Size | Qty | No1 | Size | Qty | No2 | Size | Qty | Part No | Add to Quote |
|---|---|---|---|---|---|---|---|---|---|
| 2.80 X 1.90 | 20 | P048 | 47.70 X 3.50 | 5 | P195 | 194.50 X 8.40 | 2 | P003 | |
| 3.80 X 1.90 | 20 | P049 | 48.70 X 3.50 | 5 | P200 | 199.50 X 8.40 | 2 | P004 | |
| 4.80 X 1.90 | 20 | P050 | 49.70 X 3.50 | 5 | P205 | 204.50 X 8.40 | 2 | P005 | |
| 5.80 X 1.90 | 20 | P048A | 47.60 X 5.70 | 4 | P209 | 208.50 X 8.40 | 2 | P006 | |
| 6.80 X 1.90 | 20 | P050A | 49.60 X 5.70 | 4 | P210 | 209.50 X 8.40 | 2 | P007 | |
| 7.80 X 1.90 | 20 | P052 | 51.60 X 5.70 | 2 | P215 | 214.50 X 8.40 | 2 | P008 | |
| 8.80 X 1.90 | 20 | P053 | 52.60 X 5.70 | 2 | P220 | 219.50 X 8.40 | 2 | P009 | |
| 9.80 X 1.90 | 20 | P055 | 54.60 X 5.70 | 2 | P225 | 224.50 X 8.40 | 2 | P010 | |
| 9.80 X 2.40 | 20 | P056 | 55.60 X 5.70 | 2 | P230 | 229.50 X 8.40 | 2 | P010A | |
| 10.80 X 2.40 | 20 | P058 | 57.60 X 5.70 | 2 | P235 | 234.50 X 8.40 | 2 | P011 | |
| 11.00 X 2.40 | 15 | P060 | 59.60 X 5.70 | 2 | P240 | 239.50 X 8.40 | 2 | P0112 | |
| 11.80 X 2.40 | 15 | P062 | 61.60 X 5.70 | 2 | P245 | 244.50 X 8.40 | 2 | P012 | |
| 12.80 X 2.40 | 15 | P063 | 62.60 X 5.70 | 2 | P250 | 249.50 X 8.40 | 2 | P012.5 | |
| 13.80 X 2.40 | 15 | P065 | 64.60 X 5.70 | 2 | P255 | 254.50 X 8.40 | 2 | P014 | |
| 14.80 X 2.40 | 15 | P067 | 66.60 X 5.70 | 2 | P260 | 259.50 X 8.40 | 2 | P015 | |
| 15.80 X 2.40 | 15 | P070 | 69.60 X 5.70 | 2 | P265 | 264.50 X 8.40 | 2 | P016 | |
| 17.80 X 2.40 | 15 | P071 | 70.60 X 5.70 | 2 | P270 | 269.50 X 8.40 | 2 | P018 | |
| 19.80 X 2.40 | 15 | P075 | 74.60 X 5.70 | 2 | P275 | 274.50 X 8.40 | 2 | P020 | |
| 20.80 X 2.40 | 10 | P080 | 79.60 X 5.70 | 2 | P280 | 279.50 X 8.40 | 2 | P021 | |
| 21.80 X 2.40 | 10 | P085 | 84.60 X 5.70 | 2 | P285 | 284.50 X 8.40 | 2 | P022 | |
| 21.70 X 3.50 | 10 | P090 | 89.60 X 5.70 | 2 | P290 | 289.50 X 8.40 | 2 | P022A | |
| 22.10 X 3.50 | 10 | P095 | 94.60 X 5.70 | 2 | P295 | 294.50 X 8.40 | 2 | P022.4 | |
| 23.70 X 3.50 | 10 | P100 | 99.60 X 5.70 | 2 | P300 | 299.50 X 8.40 | 2 | P024 | |
| 24.70 X 3.50 | 10 | P102 | 101.60 X 5.70 | 2 | P315 | 314.50 X 8.40 | 2 | P025 | |
| 25.20 X 3.50 | 10 | P105 | 104.60 X 5.70 | 2 | P320 | 319.50 X 8.40 | 2 | P025.5 | |
| 25.70 X 3.50 | 10 | P110 | 109.60 X 5.70 | 2 | P335 | 334.50 X 8.40 | 2 | P026 | |
| 27.70 X 3.50 | 10 | P112 | 111.60 X 5.70 | 2 | P340 | 339.50 X 8.40 | 2 | P028 | |
| 28.70 X 3.50 | 5 | P115 | 114.60 X 5.70 | 2 | P355 | 354.50 X 8.40 | 2 | P029 | |
| 29.20 X 3.50 | 5 | P120 | 119.60 X 5.70 | 2 | P360 | 359.50 X 8.40 | 2 | P029.5 | |
| 29.70 X 3.50 | 5 | P125 | 124.60 X 5.70 | 2 | P375 | 374.50 X 8.40 | 2 | P030 | |
| 30.70 X 3.50 | 5 | P130 | 129.60 X 5.70 | 2 | P385 | 384.50 X 8.40 | 2 | P031 | |
| 31.20 X 3.50 | 5 | P132 | 131.60 X 5.70 | 2 | P400 | 399.50 X 8.40 | 2 | P031 5 | |
| 31.70 X 3.50 | 5 | P135 | 134.60 X 5.70 | 2 | P032 | ||||
| 33.70 X 3.50 | 5 | P140 | 139.60 X 5.70 | 2 | P034 | ||||
| 34.70 X 3.50 | 5 | P145 | 144.60 X 5.70 | 2 | P035 | ||||
| 35.20 X 3.50 | 5 | P150 | 149.60 X 5.70 | 2 | P035.5 | ||||
| 35.70 X 3.50 | 5 | P150A | 149.50 X 8.40 | 2 | P036 | ||||
| 37.70 X 3.50 | 5 | P155 | 154.50 X 8.40 | 2 | P038 | ||||
| 38.70 X 3.50 | 5 | P160 | 159.50 X 8.40 | 2 | P039 | ||||
| 39.70 X 3.50 | 5 | P165 | 164.50 X 8.40 | 2 | P040 | ||||
| 40.70 X 3.50 | 5 | P170 | 169.50 X 8.40 | 2 | P041 | ||||
| 41.70 X 3.50 | 5 | P175 | 174.50 X 8.40 | 2 | P042 | ||||
| 43.70 X 3.50 | 5 | P180 | 179.50 X 8.40 | 2 | P044 | ||||
| 44.70 X 3.50 | 5 | P185 | 184.50 X 8.40 | 2 | P045 | ||||
| 45.70 X 3.50 | 5 | P190 | 189.50 X 8.40 | 2 | P046 |
O-Ring Cord
O-Ring Cord
Product Code: oringCord
CS | L | Part No | Add to Quote |
|---|---|---|---|
| 1.2 | 1000 | NRC-70-M1 | |
| 1.5 | 1000 | NRC-70-M2 | |
| 1.6 | 1000 | NRC-70-M3 | |
| 1.78 | 1000 | NRC-70-M4 | |
| 1.9 | 1000 | NRC-70-M5 | |
| 2 | 1000 | NRC-70-M6 | |
| 2.4 | 500 | NRC-70-M7 | |
| 2.5 | 500 | NRC-70-M8 | |
| 2.62 | 500 | NRC-70-M9 | |
| 3 | 500 | NRC-70-M10 | |
| 3.5 | 400 | NRC-70-M11 | |
| 4 | 300 | NRC-70-M12 | |
| 4.5 | 250 | NRC-70-M13 | |
| 5 | 200 | NRC-70-M14 | |
| 5.34 | 200 | NRC-70-M15 | |
| 5.5 | 200 | NRC-70-M16 | |
| 5.7 | 200 | NRC-70-M17 | |
| 6.0 | 150 | NRC-70-M18 | |
| 6.5 | 150 | NRC-70-M19 | |
| 6.99 | 150 | NRC-70-M20 | |
| 7 | 150 | NRC-70-M21 | |
| 7.5 | 100 | NRC-70-M22 | |
| 8 | 100 | NRC-70-M23 | |
| 8.4 | 100 | NRC-70-M24 | |
| 8.5 | 100 | NRC-70-M25 | |
| 9 | 60 | NRC-70-M26 | |
| 9.5 | 60 | NRC-70-M27 | |
| 10 | 50 | NRC-70-M28 | |
| 11 | 50 | NRC-70-M29 | |
| 12 | 40 | NRC-70-M30 | |
| 12.7 | 40 | NRC-70-M31 | |
| 13 | 40 | NRC-70-M32 | |
| 14 | 30 | NRC-70-M33 | |
| 15 | 30 | NRC-70-M34 | |
| 16 | 30 | NRC-70-M35 | |
| 17 | 25 | NRC-70-M36 | |
| 18 | 25 | NRC-70-M37 | |
| 19 | 20 | NRC-70-M38 | |
| 20 | 40 | NRC-70-M39 | |
| 21 | 40 | NRC-70-M40 | |
| 22 | 30 | NRC-70-M41 | |
| 23 | 30 | NRC-70-M42 | |
| 24 | 50 | NRC-70-M43 | |
| 25 | 40 | NRC-70-M44 |
Rubber Washers
Rubber Washer
Product Code: rubberWasher
| Part No | Add to Quote |
|---|---|
| NRC-70-M45 | |
| NRC-70-M46 | |
| NRC-70-M47 | |
| NRC-70-M48 | |
| NRC-70-M49 | |
| NRC-70-M50 | |
| NRC-70-M51 | |
| NRC-70-M52 | |
| NRC-70-M53 | |
| NRC-70-M54 | |
| NRC-70-M55 | |
| NRC-70-M56 | |
| NRC-70-M57 | |
| NRC-70-M58 | |
| NRC-70-M59 | |
| NRC-70-M60 | |
| NRC-70-M61 | |
| NRC-70-M62 | |
| NRC-70-M63 | |
| NRC-70-M64 | |
| NRC-70-M65 | |
| NRC-70-M66 | |
| NRC-70-M67 | |
| NRC-70-M68 | |
| NRC-70-M69 | |
| NRC-70-M70 | |
| NRC-70-M71 | |
| NRC-70-M72 | |
| NRC-70-M73 | |
| NRC-70-M74 | |
| NRC-70-M75 | |
| NRC-70-M76 | |
| NRC-70-M77 | |
| NRC-70-M78 | |
| NRC-70-M79 | |
| NRC-70-M80 | |
| NRC-70-M81 | |
| NRC-70-M82 | |
| NRC-70-M83 | |
| NRC-70-M84 | |
| NRC-70-M85 | |
| NRC-70-M86 | |
| NRC-70-M87 | |
| NRC-70-M88 | |
| NRC-70-M89 | |
| NRC-70-M90 | |
| NRC-70-M91 | |
| NRC-70-M92 | |
| NRC-70-M93 | |
| NRC-70-M94 | |
| NRC-70-M95 | |
| NRC-70-M96 | |
| NRC-70-M97 | |
| NRC-70-M98 | |
| NRC-70-M99 |
Custom O-Ring Solutions
While our extensive catalog covers most standard applications, many engineering challenges require specialized sealing solutions. National Rubber Corporation's custom O-ring manufacturing capabilities allow us to create seals that perfectly match your unique specifications and performance requirements.
Whether you need non-standard dimensions, proprietary rubber compounds, special certifications, or seals designed for extreme operating conditions, our engineering team works closely with you to develop custom solutions that ensure optimal performance and reliability.
Need Help Selecting?
Our technical experts can help you select the right O-ring for your specific application. Contact us with details about your operating conditions, and we'll recommend the optimal sealing solution.
- AS568 and JIS B2401 standard compliance
- Wide range of specialty materials
- Precision manufacturing tolerances
- Custom compounding capabilities
- Technical support and application guidance
- Fast delivery and reliable supply