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Artikel |
Spezifikation |
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Product |
NBR Nitrile Rubber O-Ring |
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Standard |
AS568 |
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Size Series |
309–395 |
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Material |
NBR |
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Härte |
90 Shore A |
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Querschnitt |
5,33 mm |
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Hauptmerkmale |
Oil Resistance, Wear Resistance, High Hardness |
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Anwendungen |
Hydraulic Systems, Industrial Equipment, Machinery Sealing |
NBR-O-Ringe
AS568 NBR90 High Hardness Nitrile O Ring Seal 5.33mm Cross Section
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Produktbeschreibung
The AS568 309–395 Series NBR90 High Hardness Nitrile O-Ring is manufactured from quality NBR rubber with a hardness of 90 Shore A and a 5.33 mm cross-section.
It offers good oil resistance, wear resistance, and extrusion resistance, providing reliable sealing performance in demanding operating conditions.
Suitable for static and dynamic sealing applications in hydraulic systems, industrial machinery, pumps, valves, and oil-related equipment. Custom sizes, material options, and OEM manufacturing are available to meet specific application requirements.

O-Ring Measurement Tips
When measuring an O-ring, pay close attention to the Inner Diameter (ID) and Cross Section (CS).
Use a suitable caliper or professional measuring tool, and avoid excessive stretching or compression.
Ensure the O-ring is clean and free from visible deformation before measurement.
Taking measurements at multiple points helps improve accuracy.

NBR O-Ring Size Chart : AS568 and JIS Stardard
For more detail size ,please download the PDF. file (ASB568 O ring size chart)

NBR O RING Product Advantages
1. High Hardness Material
Made from NBR90 nitrile rubber with a hardness of 90 Shore A for demanding sealing applications.2. Good Oil Resistance
Offers good resistance to mineral oils, lubricating oils, and various oil-based media, making it suitable for hydraulic systems.3. Extrusion Resistance Under High Pressure
The high-hardness material helps improve extrusion resistance in higher-pressure applications, depending on groove design and operating conditions.4. Standard Size Compatibility
Designed according to the AS568 size series, with a 5.33 mm cross-section for convenient selection and installation.
Application Areas of NBR O-Rings
The AS568 NBR90 High Hardness Nitrile O-Ring is designed for industrial sealing applications requiring good oil resistance, wear resistance, and extrusion resistance.
It is commonly used in hydraulic cylinders, hydraulic pumps, valves, construction machinery, industrial equipment, and lubrication systems.
Suitable for static and selected dynamic sealing applications, its 90 Shore A hardness helps provide
stable sealing performance under demanding pressure conditions,
depending on system design and operating environments.

Rubber Material Performance Comparison NBR EPDM FKM PTFE VMQ HNBR FFKM
JINNAI SEAL offers a wide range of rubber and sealing materials, including NBR, EPDM, FKM, PTFE, VMQ, HNBR, and FFKM.
Each material features different properties in terms of oil resistance, chemical resistance, temperature range, and durability.
We provide professional material selection and customized sealing solutions to meet the requirements of various industrial applications.

Our factory Production equipment
We are equipped with complete production facilities including mixing machines, CNC machines, injection molding machines, cryogenic deflashing machines and post-curing ovens. In-house mold making and automated workflows boost efficiency to support fast order delivery.

Verpackung / Zahlung / Versandservice
- PaketWir bieten Standardkartons, Paletten und Holzkisten an. Kundenspezifische Verpackungen sind auf Anfrage erhältlich, um die Waren bei verschiedenen Transporten optimal zu schützen.
- Zahlungsmethoden:Abrechnung in verschiedenen Währungen (CNY, USD, EUR usw.). Mehrere Zahlungsmöglichkeiten, darunter Banküberweisung und PayPal. Für schnellere Transaktionen ist in einigen Ländern auch eine lokale Banküberweisung möglich.
- Liefermethode:Wir bieten internationalen Express-, Luftfracht-, Seefracht- und Bahntransport an. Für flexible Lieferbedingungen können Sie auch Ihren eigenen Spediteur beauftragen.

Company Business Description
JINNAI SEAL specializes in the development, manufacturing, and customization of industrial rubber sealing products.
Our product range includes O-rings, X-rings, Quad Rings, oil seals, rubber gaskets, washers, rubber balls, and custom rubber seals.
We offer a wide selection of materials, including NBR, FKM, EPDM, silicone, and PTFE, with customized options for dimensions, hardness, shapes, and designs.
Our products serve various industries and applications, including hydraulic and pneumatic systems, automotive manufacturing, industrial machinery, pumps, valves, and pipeline systems.
With strict quality control and flexible OEM/ODM manufacturing capabilities,
JINNAI SEAL is committed to providing reliable rubber sealing products and professional sealing solutions to customers worldwide.



Häufig gestellte Fragen-
What material is this O-ring made of?
Es besteht aus NBR (Nitril-Butadien-Kautschuk), das eine gute Beständigkeit gegenüber Mineralölen, Schmierölen und vielen Flüssigkeiten auf Erdölbasis bietet. Es wird häufig in Hydraulik- und Industrieanlagen eingesetzt.
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What does the 5.33mm cross-section mean?
The 5.33mm cross-section refers to the thickness or diameter of the O-ring cord. It is a standard cross-section used in certain AS568 size series. The inner diameter and groove dimensions should also be confirmed when selecting the correct size.
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Where is this NBR90 O-ring commonly used?
It is commonly used in hydraulic cylinders, hydraulic pumps, valves, construction machinery, industrial equipment, and lubrication systems. It is suitable for static or dynamic sealing applications when operating conditions are compatible with the material.
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What is the common hardness of NBR O-rings, and how should hardness be selected?
70 Shore A is the most common hardness, with 50–90 Shore A generally available. Lower hardness can improve contact in low-pressure static sealing; higher hardness is preferred for high-pressure, dynamic sealing or extrusion-resistant applications, together with backup rings or adjusted groove clearance. Hardness tolerance is usually controlled at ±5 Shore A.
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What is the typical compression set of NBR O-rings?
Compression set depends on compound, hardness and test conditions. For a general-purpose 70 Shore A NBR, typical values under ASTM D395 at 70 h/100°C are about 20%–35%, and low-compression-set grades can be lower. Sealing applications should be validated against the actual compression ratio, temperature and time rather than judged by material grade alone.
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Can you provide custom sizes and specifications?
Yes. JINNAI SEAL supports various AS568 sizes as well as custom dimensions, hardness levels, and alternative rubber materials based on customer drawings, samples, or application requirements.
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