O Ring - High-quality O Ring manufacturer from Taiwan | NIYOK SEALING PARTS CO., LTD.
NIYOK is Taiwan high quality O Ring manufacturer and O Ring supplier With over 40 years of experience, NIYOK has been a specialist manufacturer of seals and oil seals since 1983.
O Ring
Versatile Sealing Ring for Static & Dynamic Applications
O-rings are the most common and economical seal for static and dynamic applications. NIYOK supplies AS568 and JIS B2401 standard sizes and metric sizes, plus custom O-rings made to your drawing. Material and hardness are selected for your pressure, temperature and media, from NBR, FKM, EPDM, HNBR, silicone and special compounds. NIYOK O-rings are supplied to customers in Taiwan, Japan, Brazil and other markets for automotive, motorcycle and industrial equipment.
Product Material
O-ring material is chosen by the media it contacts, the operating temperature and whether the seal is static or dynamic. We offer:
NBR (Nitrile Rubber): good resistance to mineral oils and greases at a competitive cost; standard range −40°C to 100°C.
FKM (Fluoroelastomer): excellent resistance to high temperature, fuels and aggressive fluids; standard range −25°C to 250°C.
EPDM: excellent resistance to water, steam, weathering, ozone and glycol-based brake fluids; not suitable for mineral oils or fuels; standard range −55°C to 125°C.
HNBR (Hydrogenated Nitrile): higher heat, wear and aging resistance than NBR for heavy-duty use; standard range −40°C to 150°C.
Silicone (MVQ): very wide temperature range and good flexibility, best for static or low-wear applications; standard range −60°C to 225°C.
ACM (Acrylic Rubber): good resistance to hot engine and transmission oils; widely used in Japanese vehicle designs.
SBR: economical general-purpose rubber for water and air; not oil-resistant.
Special compounds can be developed for your operating conditions, and our engineers will recommend the most suitable material for your application.
Our Advantages
1. Wide standard range: AS568, JIS B2401 (P/G/S series) and common metric sizes are available, and precision O-rings can be made for different industrial needs.
2. O-ring kits: complete O-ring kits for the repair and maintenance market.
3. Low tooling cost: molds already exist for most standard sizes, so no tooling investment is needed. For special sizes we keep mold costs low or co-develop the tooling with you.
4. Flexible MOQ and fast delivery: small orders and sample testing are supported, and stocked items ship quickly so you can plan production with more flexibility.
5. Automatic inspection: automatic inspection equipment introduced in 2020 removes the bottleneck of manual inspection and keeps quality consistent.
6. Custom development: send your drawing (CAD) or a sample and our engineers will propose the O-ring design and material.
What is an O-Ring?
An O-Ring is a round, mechanical gasket designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. O-Rings are one of the most common types of seals because they're inexpensive, reliable and have simple mounting requirements. Since they are known as one of the most important elements of machine design, o-rings may be used in static applications, where little range of motion is required. O-Rings may be used in dynamic applications, like rotating pump shafts and hydraulic cylinder positions.
Features
- Tight tolerances on cross-section, inner and outer diameter
- Most economical choice for static sealing
- Suitable for both axial and radial sealing
- Wide choice of materials and hardness
How to Select the Right O-ring Material?
NIYOK offers a range of rubber materials for O-ring applications, including NBR, FKM, SE, EPDM, HNBR, and other specialty-grade materials. Based on your specific requirements, we provide the most suitable material for your application.- 1. Working Media
- Select rubber materials with appropriate resistance based on the media the O-ring will contact — such as oils, water, steam, or chemical agents. Material compatibility with the operating fluid ensures long-term sealing reliability.
- 2. Operating Temperature
- Select materials capable of maintaining elasticity and sealing performance over the long term, based on your actual minimum and maximum operating temperatures. Temperature stability is critical to prevent premature seal failure.
- 3. Static or Dynamic Sealing
- Evaluate material compression, wear resistance, and friction characteristics based on whether the application requires static or dynamic sealing — such as reciprocating or rotary motion. Dynamic applications demand higher durability and lower friction properties.
- 4. Regulatory and Certification Requirements
- For food, drinking water, or medical applications, confirm relevant standards and certifications such as FDA and NSF based on your specific end-use requirements.
- 5. Cost and Service Life Balance
- Balance material performance, service life, and cost to select the material that best meets your actual requirements and budget constraints.
Specification
- AS568 inch series: cross-sections 1.78 / 2.62 / 3.53 / 5.33 / 6.99 mm
- Metric series: cross-sections 1 / 1.5 / 2 / 2.5 / 3 / 3.5 / 4 / 5 mm
- JIS B2401 / JASO series: cross-sections 1.9 / 2.4 / 3.5 mm
- Custom sizes: made to your drawing
O-ring Quotation Request Form
- Application Equipment：[Equipment name/description]
- O-ring Size (ID × CS)：[Dimensions in mm]
- Working Media：[Oil / Water / Steam / Chemical / Other]
- Minimum Operating Temperature(°C)：
- Maximum Operating Temperature(°C)：
- Operating Pressure(MPa / bar)：
- Static or Dynamic：
- Specified Material：
- Specified Hardness：
- Regulatory/Certification Requirements(FDA / NSF / ISO / Other)：
- Quantity per Request：
- Estimated Annual Quantity：
- Product Drawing Available：[Yes / No]
- Sample Required：[Yes / No]
Unsure About O-ring Size, Material, or Hardness?
NIYOK's engineering team is here to help. By providing your application location, working media, operating temperature, pressure, dimensions, and product drawings, we can evaluate the most suitable O-ring materials and sealing specifications based on your actual operating conditions. Submit your O-ring specification requirements now and let NIYOK's engineering team assist with material selection and specification evaluation.Application Industry
- Automotive
- Motorcycles
- Hydraulics and pneumatics
- Industrial equipment
- Plumbing hardware
- Home appliances
- Semiconductor equipment
We're Here for You — Reach Out Anytime
From early-stage R&D to full-scale production and supply, our team provides end-to-end technical support and solutions.
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O-Ring Size Catalog
Download NIYOK's O-ring size catalog (PDF). Our technical sales team can recommend the right size, material and hardness for your application.
DownloadO-Ring Kit Size List
Download the size list for NIYOK O-ring kits (PDF). Our technical sales team can help you choose the right kit for your application.
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NIYOK O Ring Service Introduction
Located in Taiwan since 1983, NIYOK SEALING PARTS CO., LTD. is a O Ring supplier and manufacturer with more than 43 years of experence in the Seal Industry.
With over 40 years of experience, NIYOK has been a specialist manufacturer of seals and oil seals From oil seals, O-rings, to gaskets, and customized products, application industries include manufacturing, chemical processing, defense, water treatment and filtration, hydraulics, fluid power, heavy trucks, automobiles, aerospace, oil and gas, medical and For life sciences, food and beverages, a complete product line is available for customer needs and specifications.
NIYOK has been offering customers high-quality O Ring production service, both with advanced technology and 43 years of experience, NIYOK ensures each customer's demands are met.