High-Quality NBR Nitrile O-Ring Kit — 419 PCS, 30 Sizes, 90 Durometer Assorted Rubber O-Ring Set for Automotive, Excavator & Pipeline Maintenance
Product Overview
This professional-grade NBR nitrile O-ring kit delivers reliable, leakproof sealing performance across a wide range of industrial and mechanical applications. Manufactured from premium nitrile butadiene rubber (NBR) at 90 Shore A durometer, each O-ring offers excellent oil resistance, wear resistance, and stable physical properties. The assorted set is organized in a portable storage case for quick size selection and convenient on-site use.
In addition to NBR, we offer optional FKM (Viton), EPDM, and Silicone rubber materials to meet diverse working conditions — including high-temperature, chemical-resistant, ozone-resistant, and extreme low-temperature environments.
Available O-Ring Kit Configurations
The two kits below are also commonly requested. Customized kits are available upon request for other sizes.
BOX-G — AS568 Standard O-Ring Kit
NBR382 PcsProfessional Quality Nitrile Rubber (NBR) · AS568 Standard Sizes
| Part No. | ID (mm) | CS (mm) | Qty |
Part No. | ID (mm) | CS (mm) | Qty |
| A 006 | 2.90 | 1.78 | 20 | A 211 | 20.22 | 3.53 | 10 |
| A 007 | 3.68 | 1.78 | 20 | A 212 | 21.82 | 3.53 | 10 |
| A 008 | 4.47 | 1.78 | 20 | A 213 | 23.39 | 3.53 | 10 |
| A 009 | 5.28 | 1.78 | 20 | A 214 | 24.99 | 3.53 | 10 |
| A 010 | 6.07 | 1.78 | 20 | A 215 | 26.57 | 3.53 | 10 |
| A 011 | 7.65 | 1.78 | 20 | A 216 | 28.17 | 3.53 | 10 |
| A 012 | 9.25 | 1.78 | 20 | A 217 | 29.74 | 3.53 | 10 |
| A 110 | 9.19 | 2.62 | 13 | A 218 | 31.34 | 3.53 | 10 |
| A 111 | 10.77 | 2.62 | 13 | A 219 | 32.92 | 3.53 | 10 |
| A 112 | 12.37 | 2.62 | 13 | A 220 | 34.52 | 3.53 | 10 |
| A 113 | 13.94 | 2.62 | 13 | A 221 | 36.09 | 3.53 | 10 |
| A 114 | 15.54 | 2.62 | 13 | A 222 | 37.69 | 3.53 | 10 |
| A 115 | 17.12 | 2.62 | 13 | A 325 | 37.47 | 5.33 | 7 |
| A 116 | 18.72 | 2.62 | 13 | A 326 | 40.64 | 5.33 | 7 |
| A 210 | 18.64 | 3.53 | 10 | A 327 | 43.82 | 5.33 | 7 |
| Total Quantity: 382 Pcs |
BOX-H — Metric Size O-Ring Kit
NBR404 PcsProfessional Quality Nitrile Rubber (NBR) · Metric Sizes
| Part No. | ID (mm) | CS (mm) | Qty |
Part No. | ID (mm) | CS (mm) | Qty |
| R_01 | 3.00 | 2.00 | 18 | R_16 | 20.00 | 3.00 | 12 |
| R_02 | 4.00 | 2.00 | 18 | R_17 | 22.00 | 3.00 | 12 |
| R_03 | 5.00 | 2.00 | 18 | R_18 | 24.00 | 3.00 | 12 |
| R_04 | 6.00 | 2.00 | 18 | R_19 | 25.00 | 3.00 | 12 |
| R_05 | 7.00 | 2.00 | 17 | R_20 | 27.00 | 3.00 | 12 |
| R_06 | 8.00 | 2.00 | 17 | R_21 | 28.00 | 3.00 | 12 |
| R_07 | 10.00 | 2.00 | 17 | R_22 | 30.00 | 3.00 | 12 |
| R_08 | 10.00 | 2.50 | 14 | R_23 | 32.00 | 3.00 | 12 |
| R_09 | 11.00 | 2.50 | 14 | R_24 | 33.00 | 3.00 | 12 |
| R_10 | 12.00 | 2.50 | 14 | R_25 | 35.00 | 3.00 | 12 |
| R_11 | 14.00 | 2.50 | 14 | R_26 | 36.00 | 3.00 | 12 |
| R_12 | 16.00 | 2.50 | 14 | R_27 | 38.00 | 3.00 | 12 |
| R_13 | 17.00 | 2.50 | 14 | R_28 | 38.00 | 4.00 | 9 |
| R_14 | 19.00 | 2.50 | 14 | R_29 | 42.00 | 4.00 | 9 |
| R_15 | 19.00 | 3.00 | 12 | R_30 | 45.00 | 4.00 | 9 |
| Total Quantity: 404 Pcs |
O-Ring Kit NBR90 — 397 Pcs
NBR 90 Shore A397 PcsMixed Metric & Standard Sizes
| Part No. | Size (mm) | Qty |
Part No. | Size (mm) | Qty |
| P3 | 2.8 × 1.9 | 18 | P22 | 21.8 × 2.4 | 14 |
| P4 | 3.8 × 1.9 | 18 | P22.4 | 22.1 × 3.5 | 10 |
| P5 | 4.8 × 1.9 | 18 | G25 | 24.4 × 3.1 | 11 |
| P6 | 5.8 × 1.9 | 18 | P25 | 24.7 × 3.5 | 10 |
| P7 | 6.8 × 1.9 | 18 | P26 | 25.7 × 3.5 | 10 |
| P8 | 7.8 × 1.9 | 18 | G30 | 29.4 × 3.1 | 11 |
| P9 | 8.8 × 1.9 | 18 | P30 | 29.7 × 3.5 | 10 |
| P10A | 9.8 × 2.4 | 14 | P32 | 31.7 × 3.5 | 10 |
| P11 | 10.8 × 2.4 | 14 | P34 | 33.7 × 3.5 | 10 |
| P12 | 11.8 × 2.4 | 14 | G35 | 34.4 × 3.1 | 11 |
| P14 | 13.8 × 2.4 | 14 | P36 | 35.7 × 3.5 | 10 |
| P16 | 15.8 × 2.4 | 14 | G40 | 39.4 × 3.1 | 11 |
| P18 | 17.8 × 2.4 | 14 | P40 | 39.7 × 3.5 | 10 |
| P20 | 19.8 × 2.4 | 14 | G45 | 44.4 × 3.1 | 11 |
| P21 | 20.8 × 2.4 | 14 | P48 | 47.7 × 3.5 | 10 |
Applications & Working Principle
O-rings are installed on a wide variety of machinery and equipment to provide reliable sealing under specified temperature, pressure, and media conditions — whether at rest or in motion. They are widely used across marine, automotive, aerospace, metallurgical, chemical, engineering, construction, mining, petroleum, plastic, and agricultural machinery, as well as in a broad range of instruments and sealing elements.
O-rings are primarily used for static seals and reciprocating seals. For rotational movement, they are limited to low-speed rotary sealing devices. Typically installed in a rectangular groove on the outer or inner circle of the sealing section, O-rings continue to deliver excellent shock absorption in oil, acid, wear, and chemically erosive environments. As a result, they are the most widely used seal in hydraulic and pneumatic drive systems.
Key Features
- Made from high-quality NBR (Nitrile Rubber), with optional FKM, EPDM, and Silicone materials for diverse working conditions.
- Excellent oil resistance, wear resistance, and reliable sealing performance.
- FKM version offers outstanding high-temperature and chemical resistance.
- EPDM performs well in ozone and weather resistance.
- Silicone withstands extreme high and low temperatures.
- Stable physical properties and low compression set for long service life.
- Multiple sizes packed in one portable storage case for quick selection and convenient storage.
- Ideal for industrial repair, replacement, and after-market spare parts.
Application Areas
Suitable for sealing applications in automotive systems, hydraulic and pneumatic equipment, construction machinery, pumps and valves, pipeline fittings, HVAC systems, and general industrial machinery. Commonly used for maintenance and replacement of engines, gearboxes, compressors, fuel systems, and water treatment devices. Perfect for factory workshop repair, on-site equipment servicing, and after-market spare parts.
What Are NBR O-Rings?
Alongside FKM and HNBR, NBR (nitrile butadiene rubber) is one of the most frequently used elastomers for sealing elements. The material is characterized by advantageous mechanical properties and a broad resistance profile. The wide range of applications for these O-rings is limited only by their restricted suitability for high temperatures.
HNBR (hydrogenated nitrile butadiene rubber) extends the high-temperature range of NBR and is therefore suitable for even more demanding applications. However, many standard applications can be economically realized with NBR O-rings. They are also known by manufacturer trade names such as Perbunan® or Europrene®.
Technical Specifications
| ISO Designation | NBR |
|---|
| Trade Names | Perbunan |
|---|
| Chemical Name | Nitrile Butadiene Rubber |
|---|
| Media Resistance | Medium media resistance |
|---|
| Temperature Resistance | -30°C to +120°C |
|---|
| Standard Color | Black |
|---|
| Standard Hardness | 90 Shore A |
|---|
| Scope | Automotive industry, oil & gas, chemicals |
|---|
| Production | Compression molding and injection molding |
|---|
| Tolerances | DIN ISO 3601 |
|---|
| Durability | 10 years |
|---|
Certifications
We hold the following certificates: ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, IATF 16949, FDA, REACH, ROHS, SGS, and more.
Custom Colors Available
O-ring colors can be produced according to customer requirements. The table below shows the colorful O-rings we have manufactured. If you need colored O-rings, please provide your Pantone number.
Related Rubber Seals We Produce
We also produce automotive rubber seals, connector rubber seals, power tool rubber seals, valve rubber seals, pipe rubber seals, semiconductor rubber seals, hydraulic pneumatic rubber seals, pump rubber seals, oil and gas seals, food-grade rubber seals, medical rubber seals, chemical equipment rubber seals, and more.
Our Factory
- Since 2006, focused on rubber seals, especially for auto parts.
- Certificates: ISO 9001, IATF 16949, ISO 14001, ISO 45001, ISO 13485.
- Two factories covering more than 18,000 m², including a 600 m² clean room, with 300 workers.
- More than 10,000 mold sets, including approximately 5,000 O-ring molds.
- O-ring series covers American standard (AS568), Japanese standard (JIS), national standard (GB), and a large number of customized non-standard parts.
- Materials: NBR, FKM, SIL, EPDM, CR, NR, PU, HNBR, FFKM, SBR. All rubber materials meet ROHS 2.0 and REACH 235 requirements.
- Material certificates: FDA, ROHS, REACH, UL157, CP65, WRC, EN549, EN45545.
- Products widely used in automotive parts, electronic connectors, valves, pneumatics, power tools, new energy, medical equipment, electronic products, and other fields.
- HRP, ERP, and other management systems introduced since the company's inception.
- Labor cost, raw material procurement, production process, and product quality are comprehensively and scientifically controlled.
Quality Standards
Ruichen always meets our customers' requirements. To ensure we produce high-quality O-rings, our company implements the following general standards:
- Raw material incoming inspection standard: ASTM D2000 & HG/T 2579-2008 & HG/T 2811-1996
- Public O-ring dimensional tolerance: GB/T 3452.1-2005
- N-level specification for O-ring appearance quality inspection: GB/T 3452.2-2007
- Hardness measurement model: Micro O-Ring Testing (Type M system)
- Hardness standard: ASTM D2240 Rubber Standard Test Method (Shore A)
- Sampling inspection specification: GB/T 2828.1-20
Production Progress
Quality Control Process
Material Inspection
All raw materials are stored and tested before use. A report on the corresponding material properties is issued and compared with the raw material's own property report. Only when the two reports' property values are consistent can the material be put into storage.
Model Inspection
After mold development or mold cleaning is completed on the machine, we test all specifications of the mold to ensure that each cavity meets product specifications and quality requirements.
Production Inspection
During production, inspection personnel conduct scheduled semi-finished product inspections to ensure process quality and keep the defective rate within a reasonable range.
Quality Control
The quality inspection department conducts sampling inspection on each batch of products.
Production Full Inspection
Optical inspection machines ensure the appearance and dimensions of the product are 100% qualified.
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