Are you looking for the best o-ring manufacturers in China? With so many options available, choosing the right one can be overwhelming. In this article, we’ll compare the top o-ring manufacturer factories in China, highlighting their strengths, product ranges, and what sets them apart. Let’s dive in and find the perfect fit for your needs.

Xiamen Xlong Seal Co.,Ltd 厦门旭隆密封件有限公司

Top 10 O-ring Manufacturers and Suppliers in China (2024)

Product Details: Hongju produces high-quality silicone rubber O-rings and high-temperature O-ring seals. These O-rings are used in various applications such as engines, pumps, cylinders, connectors, and valves. The company offers both standard and custom-made O-rings to meet specific customer needs. The manufacturing process includes design, tool making, color mixing, compression molding, and quality inspection. The products comply with ISO 3601 standards and can be made from various materials including silicone, EPDM, fluoro rubber, Viton, and more. The company is ISO 9001: 2008 certified and ensures products meet international safety standards like CE, SGS, REACH, and ROHS Directive requirements[1][2][3].

Pros:
– High-quality silicone rubber O-rings with strong resistance to water, oil, and h…
– Customization capabilities to meet specific customer requirements
– Strict quality control and compliance with international safety standards
– Wide range of materials available including silicone, EPDM, fluoro rubber, Viton…
– Advanced equipment and experienced staff ensure reliable quality and timely deli…
– Low minimum order quantity (MOQ) and rapid prototyping available
– Products are eco-friendly and certified by CE, FDA, and other international stan…

Cons:
– Importing from China may involve longer shipping times
– Factory inspections may be limited due to epidemic restrictions, though online i…
– Production cycle can vary based on order quantity and complexity

China O Rings Manufacturers and Suppliers

FKM O Rings, China NBR O Ring supplier

Custom HNBR O-Ring Manufacturer in China

Product Details: HNBR O-rings are made from Hydrogenated Nitrile Butadiene Rubber, obtained by saturating the double bonds in nitrile’s butadiene segments with hydrogen. This process enhances the material’s heat, ozone, chemical resistance, and mechanical characteristics. HNBR O-rings are available in 70, 80, and 90 durometers and have a temperature range from -30°C to +150°C (-20°F to +302°F). They are suitable for use with petroleum-based oils and fuels, aliphatic hydrocarbons, vegetable oils, silicone oils and greases, ethylene glycol, water, and steam up to 300ºF, and diluted acids, bases, and salt solutions.

Pros:
– Superior heat, ozone, and chemical resistance
– Enhanced mechanical characteristics and durability
– Wide temperature range (-30°C to +150°C or -20°F to +302°F)
– Excellent resistance to wear, tear, and compression
– Good performance with petroleum-based oils and fuels, aliphatic hydrocarbons, an…
– Available in various durometers (70, 80, 90) to meet different application needs

Cons:
– Not suitable for use with chlorinated hydrocarbons, ketones, ethers, esters, and…
– Higher acrylonitrile content reduces low-temperature properties but improves res…
– Sulfur-curing reduces heat resistance and causes an inferior compression set

O-Rings, Rubber Seals – Best China Manufacturer & Supplier

Product Details: Savvy Rubber offers a wide range of o-rings, including traditional standard o-rings, encapsulated o-rings, backup-rings, and x-rings. They have thousands of molds available to meet various size and shape requirements. The o-rings can be made from different materials such as NBR, FKM (Viton), Silicone, EPDM, HNBR, CR, and Aflas. Each material has specific properties and is suited for different working conditions. For example, NBR is widely used due to its good properties and low cost, FKM/Viton is known for its comprehensive performance, and Silicone is often used in medical and food industries. The hardness of o-rings is measured in Shore

A units, typically ranging from 40 to 90, with 70 being generally more suitable. O-rings can also be produced in various colors, with common colors including Black for NBR, Green for HNBR, and Brown for Viton.

Pros:
– Wide range of materials available to suit different applications
– Thousands of molds to meet various size and shape requirements
– Fast delivery options through door-to-door courier services
– Low mold/tooling costs for custom o-rings
– High-quality products with favorable prices
– Ability to produce o-rings in various colors

Cons:
– Unique or non-commonly used colors may increase cost and require a larger MOQ wi…
– Low hardness o-rings can be prone to peeling, installation damage, extrusion, an…

O Rings Manufacturer | O Rings Supplier – Hongjie Rubber Seal

Product Details: Hongjie Rubber Seal offers a wide range of O-rings with various custom options. They provide a one-stop OEM/ODM solution, allowing customers to customize design, color, packaging, and logo. The company adheres to various international O-Ring standards, and most sizes are already tooling, eliminating the need for additional investment. They use well-known raw material suppliers to ensure basic product quality and offer certificated compounds to meet specific market requirements. Their certificated laboratory develops and identifies compounds according to customer specifications or ASTM D200 call outs.

Pros:
– Custom options: design, color, packaging, logo
– Various international O-Ring standards with pre-existing tooling
– High-quality raw materials from known suppliers
– Certificated compounds for specific markets
– Certificated laboratory for compound development
– Affordable factory direct prices

Cons:
– No specific cons mentioned on the website

Xiamen Seals Technology Co.,Ltd: China O-Rings, X-Rings …

China O-Ring Kits Suppliers – NNK Oil Seal

Product Details: O-ring kit boxes are comprehensive sets containing various sizes of O-rings, typically made from materials such as NBR (Nitrile), Silicone, FKM, EPDM, and HNBR. These kits are designed to provide a wide range of O-ring sizes for different applications, including sealing liquid and gaseous media in high-pressure environments. Each kit usually includes multiple sizes of O-rings, often organized and stored in a durable box. For example, kits like the 5A, 5B, and 5C from Kesaria Rubber Industries contain 382 pieces in 30 assorted sizes, available in NBR and Silicone materials[1][2][4].

Pros:
– Provides a wide range of O-ring sizes for various applications.
– Made from high-quality materials ensuring superior sealing performance.
– Customization options available to meet specific requirements.
– Enhances system efficiency by preventing leaks and reducing friction.
– Suitable for many industrial applications, including static, dynamic, hydraulic,…

Cons:
– May not be suitable for safety-critical applications like automotive without pre…
– The cost can be higher compared to lower-quality alternatives, though it offers…
– Storage and organization of the O-rings can be complex if not properly managed.

Custom O-ring Manufacturer and Wholesale Supplier – Hongju

Product Details: Hongju Silicone offers custom and wholesale O-ring seals made from high-quality silicone and rubber materials. These O-rings are designed for various applications, including engines, pumps, cylinders, connectors, and valves. They are available in standard and custom sizes, and the company follows ISO3601 standards for dimensions and tolerances. The manufacturing process includes O-ring design, tool making, color mixing, compression molding, quality inspection, and packaging. Materials can be customized, including the use of liquid silicone rubber. The O-rings are resistant to water, oil, and high temperatures, making them suitable for extreme use environments.

Pros:
– High-quality raw materials and precision molds ensure strong resistance to water…
– Wide selection of stock items at wholesale prices, along with customization capa…
– Strict quality control over the production process, including manual and machine…
– Fast delivery and good customer service.
– Ability to accommodate low minimum order quantities (MOQs).
– Free samples available for testing.

Cons:
– Specific hardness tolerance of plus or minus 3-5A, which may not meet all precis…
– Silicone O-rings have poor tear resistance and are not ideal for dynamic applica…

Comparison Table

Frequently Asked Questions (FAQs)

What types of materials are commonly used by o-ring manufacturers in China?

O-ring manufacturers in China use a variety of materials, but the most common ones are rubber compounds. These include NBR (Nitrile Butadiene Rubber), FKM (Fluororubber or Viton), and Silicone. Each material has its own unique properties and is chosen based on the specific application and working conditions. For example, NBR is widely used due to its good performance and low cost, while FKM is known for its excellent comprehensive performance and is often used in high-standard sealing equipment.

How do I specify the size of an o-ring when ordering from a Chinese manufacturer?

When ordering o-rings from a Chinese manufacturer, you typically need to specify the inside diameter (ID), outside diameter (OD), and the cross-section (CS) or width. The OD can be calculated using the formula: OD = ID + CS * 2. Manufacturers often follow international standards such as AS568 for the USA, BS1516 for the UK, or ISO 3601 for international standards, so it’s helpful to refer to these standards when placing your order.

Can Chinese o-ring manufacturers produce custom o-rings with specific designs and colors?

Yes, many Chinese o-ring manufacturers offer custom o-ring services. You can request specific designs, colors, and even custom packaging and logos. These manufacturers often have a wide range of molds and can produce o-rings according to your custom drawings or samples. Additionally, they can provide various color options, though choosing less common colors may increase the cost and require a larger minimum order quantity.

What certifications should I look for when selecting an o-ring manufacturer in China?

When selecting an o-ring manufacturer in China, look for certifications such as ISO 9001, ISO 14001, and IATF16949. These certifications ensure that the manufacturer follows strict quality management, environmental management, and automotive industry standards. Some manufacturers also have certifications like ISO 13485, which is specific to medical devices, ensuring the products meet the required safety and quality standards.

How do I ensure the quality of o-rings from Chinese manufacturers?

To ensure the quality of o-rings from Chinese manufacturers, it’s important to check their certifications and reputation. Look for manufacturers that have audited supplier status and diamond member status on platforms like Made-in-China.com. Additionally, check if they have a certified laboratory to develop and test compounds according to your specifications or ASTM standards. You can also read reviews and ask for references from other customers to get a better idea of their product quality and customer service.