Nitrile Rubber (NBR) O-Rings
- YiDa
- Dalian,China
- 15-20 days
- 2 billion/year
1. Our nitrile rubber NBR o rings are manufactured with high precision and controlled according to the AS9100D system.
2. Our nitrile o-rings are oil-resistant and anti-aging, eliminating the need for frequent replacements and resulting in lower overall operating costs.
3. Since we have production facilities all over the world, most of our items for normal orders can be delivered within 15 days, thus production capacity will be stable and delivery reliable.
A great number of purchasers of industrial equipment industries, hydraulic systems, vehicle parts, and fancy machinery manufacturing, easily encounter difficulty in choosing nitrile rubber NBR O rings, such as being subjected to large dimensional errors, getting different performances from various batches, etc.
Yida Rubber introduced a high precision nitrile O-ring that meets the requirements of the AS9100D aerospace quality management system, which results in better dimensional accuracy, sealing reliability, and batch stability.
What Is a Nitrile Rubber NBR O Ring?
Precision nitrile rings made from the butadiene-acrylonitrile copolymer rubber are one of the most commonly used sealing elements in industrial applications. Considering the fact that fluororubber O-rings are very expensive and silicone O-rings are not very resistant to oil, O ring NBR finds a sweet spot between performance and cost.
Its main technical features include:
| Project | Composition |
| Material | Copolymer of Butadiene and Acrylonitrile (ACN); ACN content: 25%–40% (customizable) |
| Standard System | AS568 (US Standard), GB/T 3452.1 (National Standard) |
| Dimensional Range | Inner Diameter: 1.78 mm – 500 mm Cross-section Diameter: 1.78 mm – 12.7 mm |
| Shape | Customizable according to customer requirements |
| Color | Black (Standard); Brown, Red, Green, etc., available upon request |
| Surface Requirements | Surface Finish: Ra ≤ 1.6 μm; free of defects |
| Temperature Range | -40°C to +120°C; Short-term Peak: 130°C |
| Hardness | Shore A 70/80/90 ±5, suitable for different sealing pressure requirements. |
| Customization | Non-standard cross-sections (rectangular/profiled), adhesive backing, self-lubricating (PTFE coating), low compression set formulations |
Which Industries Use Nitrile Rings?
1. Aerospace: Sealing of hydraulic systems, fuel systems, valves, and landing gear.
2. Automotive Industry: Sealing the components such as engines, transmissions, brake systems, and fuel pumps.
3. Hydraulics and Pneumatics Industry: Sealing high-pressure cylinders, hydraulic valves, pump bodies, and pneumatic systems.
4. Industrial Equipment Manufacturing: Sealing parts of compressors, instruments, automation equipment, and chemical pipelines.
Why Are More and More Buyers Choosing Yida's Metric Nitroile O Rings?
1. Higher dimensional accuracy, suitable for precision equipment.
Ordinary NBR O-rings are manufactured using conventional standards, resulting in large dimensional fluctuations and batch-to-batch inconsistencies, which can affect sealing performance in precision assembly scenarios.
Our metric nitrile O rings adopt the AS568 American standard precision dimensional system, with an inner diameter tolerance between ±0.1-0.3mm, a wire diameter tolerance of ±0.08mm, and a cross-sectional roundness ≤0.05mm; the products are also free of burrs, missing materials, and air bubbles.
2. Enhanced oil resistance and longer service life.
Ordinary NBR O-rings often use a general-purpose formula design. When in prolonged contact with oily media, they are prone to hardening, expansion, or permanent compression deformation, thus affecting seal life.
Our O ring NBR is optimized with 25%-40% acrylonitrile content, making it resistant to hydraulic oil, engine oil, diesel oil, lubricating oil, and other oils.
3. Wider applicability, meeting diverse working conditions.
Common NBR O-rings have only a few hardness levels to choose from and generally are suitable for working environments with temperatures between -30℃ and +100℃.
We offer nitrile O-rings in various hardness levels such as Shore A 70/80/90.; These O-rings have an operating temperature range of -40°C to +120°C, thereby satisfying the long-term operational requirements of hydraulic systems, automotive, and industrial automation equipments.
4. Greater customization capabilities to meet special project requirements.
Standard NBR O-rings mainly depend on suppliers' standard specs; however, the variety is very limited for those projects with special groove structures, non-standard size designs, or special surface treatments.
But, indeed, we offer bespoke non-standard dimensions, rectangular cross-section O-rings, irregular shape seals, PTFE self-lubrication, and tapes as the preferred backing treatments.
Dalian Yida Precision Rubber Products Co., Ltd.
It was in 2006 that Yida Rubber first came into being officially. Still, our main group of people has a combined 30 years of experience in the field. At present, the company occupies a space of 37,000 square meters, employs more than 450 skilled workers, and is capable of producing over 2 billion items each year.
Our Certifications.
We have ISO9001, ISO14001, IATF16949 and CNAS certified laboratories.
Our Service Guarantee.
We adhere to a minimum order quantity of 1000 pieces; with higher order quantity, the discount will be increased (please contact us for the discount details). After order confirmation, the delivery of regular orders will be made within 15 days. We provide shipping options of land, sea, and air. Besides, packaging consists of self-sealing bags and cartons. We can give you free samples, but you will have to pay the shipping costs. When stored as recommended (temperature <30℃, humidity <70%, protected from light), unopened products giving material aging failure due to non-human factors within 3 years from the delivery date will be replaced for free after testing and confirmation.
Our Partners.
We currently export our products to Southeast Asia, Europe, South Africa, and different parts of the world. SMC recognized us as an Outstanding Supplier in 2023 and we also received the Omron Global Strategic Partner Certificate.
Exhibitions We Participated In.
In June 2025, our company participated in the 14th Shanghai International Long-Term Energy Storage Technology Conference, showcasing our sealing technology strength in the field of long-term energy storage.
FAQ:
1. Is the metric nitrile o ring suitable for all oil media?
no. For media such as brake fluid, phosphate ester hydraulic oil, ketones, and ester solvents, it is recommended to use fluororubber or ethylene-propylene rubber.
2.What are the maximum and minimum temperature resistance of nitrile rubber NBR o ring?
Standard operating temperature range is -40℃ to +120℃.
