Product Overview
This industrial rubber O-ring assortment kit is a complete sealing solution offering multiple rubber material options, including NBR, EPDM, Silicone, and FKM. It contains a wide range of sizes to meet diverse sealing maintenance needs across hydraulic, pneumatic, and fluid systems.
Key Features & Performance
- Excellent elasticity and reliable leak-proof sealing performance
- Oil resistance, high and low temperature resistance, and anti-aging properties
- Delivers dependable sealing under hydraulic, pneumatic, and fluid working conditions
- Multiple rubber materials available to match specific media and temperature requirements
Available O-Ring Kit Configurations
The two O-ring kits below are also commonly used. If you need other sizes, we can produce customized kits to your specifications.
BOX-G AS568 Standard Sizes O-Ring Kit
Professional quality Nitrile rubber (NBR) | 382 Pcs
| Part NO. (AS 568) |
ID (mm) |
CS (mm) |
Qty in Kit |
Part NO. (AS 568) |
ID (mm) |
CS (mm) |
Qty in Kit |
| 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 Sizes O-Ring Kit
Professional quality Nitrile rubber (NBR) | 404 Pcs
| Part NO. (ON Kit) |
ID (mm) |
CS (mm) |
Qty in Kit |
Part NO. (ON Kit) |
ID (mm) |
CS (mm) |
Qty in Kit |
| 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
| Part NO. |
Size (ID*CS mm) |
Qty |
Part NO. |
Size (ID*CS 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 |
Working Principle & Installation
O-rings are installed on a wide variety of machinery and equipment to provide reliable sealing at specified temperatures, pressures, and across various liquid and gaseous media, whether at rest or in motion. They are widely applied in machine, marine, automotive, aerospace, metallurgical, chemical, engineering, construction, mining, petroleum, plastic, and agricultural machinery, as well as in a broad range of instruments as sealing elements.
O-rings are mainly used for static seals and reciprocating seals. For rotational movement, they are limited to low-speed rotary sealing devices. An O-ring is typically installed in a rectangular-section groove on the outer or inner circle of the sealing section. O-ring seals also deliver good shock absorption in oil, acid, wear, erosion, and other chemical environments. As a result, O-rings are the most widely used seals in hydraulic and pneumatic drive systems.
Typical Applications
- Automotive industry: sealing for engines, hydraulic brakes, fuel systems, and vehicle maintenance repair
- Hydraulic & pneumatic systems: pumps, valves, cylinders, and air compressor sealing
- General machinery: bearings, gearboxes, and mechanical equipment sealing
- Plumbing & water treatment: pipe joints, water pumps, and fluid connection sealing
- Electrical equipment: waterproof sealing for electrical housings and fittings
- Industrial equipment: chemical and food machinery with matched rubber material options
Silicone O-Ring (MQ, VMQ, PVMQ) Material Description
Physically, silicone O-rings are based on silicon, an element derived from quartz. To create this class of synthetic elastomers, pendant organic groups such as methyl, phenyl, and vinyl are attached to silicon atoms. Different additions of side chains can achieve significant variations in properties. Silicone O-rings have excellent heat, ozone, and corona resistance, along with good dielectric stability and resistance to many oils, chemicals, and solvents. Silicone O-rings maintain the best flexible properties at low temperatures but have low tensile strength and low wear and tear resistance.
Silicone O-rings may also come in a metal detectable variation while retaining the same qualities as the general silicone O-ring compound. RUICHEN Sealing supplies silicone O-rings that are compliant with FDA standards and are suitable for use in food and beverage production lines, as well as medical and pharmaceutical manufacturing. Both silicone and metal detectable silicone O-rings meet FDA compliance.
| Feature | Value |
|---|
| ISO designation | VMQ |
| Chemical name | Silicone rubber |
| Cross-linking | Peroxide cross-linked |
| Trade names | Silicone, Silicone |
| Media resistance | Medium media resistance |
| Temperature resistance | -60 °C to +200 °C |
| Standard color | Red |
| Standard hardness | 70 Shore A |
| Industries | Food industry, gas/water installation |
| Production | Compression molding and injection molding |
| Tolerances | DIN ISO 3601 |
| Durability | 10 years |
Available Rubber Materials & Selection Guide
We can supply material as NBR, FKM, SIL, EPDM, CR, NR, PU, HNBR, FFKM, ACM, SBR, FLS (FVMQ), and more. Different elastomers have different compatibility with various chemical elements and their characteristics. See the table below for more material knowledge to order the most cost-effective O-rings from us.
| Material |
Hardness (Shore A) |
Temperature (°C) |
Main Color |
Advantage |
Price Level |
Shelf Life (Years) |
| NBR / Nitrile / Buna-N | 60–90 | -40 to 120 | Black | Good oil resistance & low price | Low | 5–10 |
| HNBR / HSN | 60–90 | -40 to 150 | Green | Suitable for the cooling industry | High | 5–10 |
| FKM / FPM / Viton | 70–90 | -20 to 200 | Brown | High-temperature & chemical resistance | High | About 20 |
| EPDM / EPR | 50–90 | -50 to 150 | Black | Excellent weather & ageing resistance | Fair | 5–10 |
| VMQ / Silicone | 40–80 | -70 to 220 | Red | High-temperature & FDA food grade | High | About 20 |
| Neoprene / CR | 50–90 | -40 to 120 | Black | Versatility properties | Fair | 5–10 |
| FFKM | 70–90 | -10 to 320 | Black | Excellent chemical & high-temperature | Highest | About 20 |
| FVMQ / Fluorosilicone | 40–80 | -60 to 200 | Blue | Wider operating temperature range | High | About 20 |
| Aflas / FEPM | 40–90 | -2 to 230 | Black | Good chemical compatibility | Higher | About 20 |
| PU / Polyurethane | 60–90 | -40 to 90 | Natural | High strength and wear resistance | High | About 10 |
Certifications & Compliance
We hold the following certificates: ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, IATF, FDA, REACH, ROHS, SGS, and more.
For the color of O-rings, we can produce to customer requirements. The table below shows the colorful O-rings we have made. If you need colored O-rings, please provide your Pantone number.
Related Rubber Sealing Products
We can also produce automotive rubber seals, connector rubber seals, power tool rubber seals, valve rubber seals, pipe rubber seals, semiconductor rubber seals, hydraulic and 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 Capabilities
- 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 mold sets
- 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. Rubber materials meet ROHS 2.0 and REACH 235 requirements
- Material certificates: FDA, ROHS, REACH, UL157, CP65, WRC, EN549, EN45545
- Products are widely used in automotive parts, electronic connectors, valves, pneumatics, power tools, new energy, medical equipment, electronic products, and other fields
- Company has introduced HRP, ERP, and other systems since its inception
- Labor cost, raw material procurement, production process, and product quality are comprehensively and scientifically controlled
Quality Standards & Inspection
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 using 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 tested before storage, and a report on the corresponding material properties is issued. Compared with the raw material's own property report, if the two property values are consistent, the material can 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 each cavity meets product specifications and quality.
- Production Inspection: During production, inspection personnel conduct timed semi-finished product inspections to ensure process rationality and control 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 products are 100% qualified.
Cooperative Partners
Ruichen has cooperated with many superior customers. We have a complete system and excellent
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