Are you looking for the best o-ring suppliers in China? With so many options available, choosing the right one can be overwhelming. In this article, we’ll compare the top o-ring 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 sizes and custom-made O-rings to meet specific customer needs. The manufacturing process includes design, tool making, color mixing, compression molding, and quality inspection. Hongju uses high-quality raw materials and adheres to ISO 3601 standards for dimensions and tolerances. They also offer the use of liquid silicone rubber for O-ring production if required.

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 adherence to ISO 9001: 2008 quality management system…
– Wide range of applications including engines, pumps, cylinders, connectors, and…
– Compliance with international safety standards such as CE, SGS, REACH, and ROHS…
– Low minimum order quantity (MOQ) and rapid prototyping available.

Cons:
– Importing from a Chinese manufacturer may involve longer shipping times.
– Factory inspections may be limited due to epidemic restrictions, though online i…

China O Rings Manufacturers and Suppliers

FKM O Rings, China NBR O Ring supplier

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

Product Details: Savvy manufactures a wide range of o-rings made from various materials including NBR, FKM (Viton), Silicone, EPDM, HNBR, CR, Aflas, and more. These o-rings are available in both imperial and metric sizes and can be customized to meet specific needs. The temperature range for these o-rings varies by material: -70°C to 220°C for Silicone, and other ranges depending on the material. The hardness is typically measured in Shore A, with common values ranging from 60 to 90. O-rings can be produced in various colors, and Savvy offers fast delivery through door-to-door courier services.

Pros:
– Good property and low cost, especially for NBR which accounts for about 50% of o…
– FKM (Viton) offers the best comprehensive performance and is widely used in high…
– Silicone o-rings are FDA-approved, tasteless, non-toxic, and resistant to high t…
– Custom o-rings can be made at a very low mold/tooling cost with fast delivery.
– Available in various colors for easy identification.

Cons:
– Low hardness o-rings are prone to peeling, installation damage, extrusion, and p…
– High hardness o-rings can be inconvenient to install.
– Unique colors may increase the cost and require a larger MOQ with a longer deliv…

O Rings Manufacturer | O Rings Supplier – Hongjie Rubber Seal

Product Details: Hongjie Sealing Technology Co., Ltd offers a wide range of O-ring products, including custom O-rings, rubber O-rings, silicone rubber O-rings, and other sealing components. They provide one-stop OEM/ODM solutions with options for custom 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 product quality and have a certified laboratory to develop and identify compounds per customer specifications or ASTM D200 callouts.

Pros:
– One-stop OEM/ODM solution with custom options for design, color, packaging, and…
– Adherence to various international O-ring standards
– No need for additional tooling investment as most sizes are already available
– Use of high-quality raw materials from reputable suppliers
– Certified laboratory for compound development and identification
– Rapid rubber products prototyping and emergency production capabilities
– IAFT 16949 certified with strict inspection standards

Cons:
– No specific information on minimum order quantities (MOQ) or pricing details pro…
– Limited details on the range of materials available beyond standard mentions
– No direct comparison with competitors in terms of cost or delivery time

China O-Ring Kits Suppliers – NNK Oil Seal

Product Details: O-ring kit boxes are comprehensive sets containing various sizes of O-rings, designed for sealing purposes in industrial, mechanical, and hydraulic applications. These kits typically include a range of O-ring sizes, often organized in a hard-wearing storage box. The O-rings are made from different materials such as NBR (Nitrile), Silicone, FKM, EPDM, and HNBR, each with specific temperature and durability characteristics. The kits are available in different configurations, such as metric, inch, and AS568A sizes, and can be customized to meet specific application needs[1][2][4].

Pros:
– Provides a wide range of O-ring sizes for various applications, ensuring versati…
– Made from high-quality materials that offer superior sealing performance and dur…
– Customization options available to tailor the kit to 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, although the qual…
– Storage and organization of the O-rings can be complex if not properly managed.

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

Product Details: Xiamen Seals Technology Co., Ltd. offers a variety of sealing products including Silicone Custom Rubber Parts, Buna-N Standard O-Rings, Spliced and Vulcanized O-Rings, Colored EPDM O-Rings, and HNBR Rubber O-Rings. The company provides a complete production chain from R&D, rapid prototypes, mould design, mould making, components production, assembling, and packing. Their products are used in various applications and are available in standard and metric sizes. The silicone custom rubber parts are FDA certified, and the company welcomes customer drawings and samples to customize parts according to specific needs.

Pros:
– Complete production chain from R&D to export
– High-quality molded rubber products
– FDA certification for silicone custom rubber parts
– Custom design capabilities based on customer specifications
– Wide range of materials and sizes available
– Good service and quality products

Cons:
– Limited information on specific product durability and lifespan
– No detailed pricing information available on the website
– Dependence on customer-provided specifications for custom designs

Perfluoroelastomer FFKM O ring Manufacturer

Product Details: FFKM O-rings are made of perfluoroelastomer compounds with a higher fluorine content than FKM fluoroelastomers. They are known for their excellent resistance to chemical corrosion, organic and inorganic acids, alkali, ester, ether, ketone, aldehyde, superheated water, and steam. The maximum operating temperature is 230 °C (446 °F), and they can be fabricated into various forms such as O-rings, diaphragms, gaskets, rubber strips, and rubber plates. Key mechanical properties include a hardness of Shore A 78, 100% modulus of 9.4 MPa, tensile strength of 15.9 MPa, and elongation at break of 130%[1].

Pros:
– High temperature resistance up to 620 °F (327 °C)[1][3] – Excellent chemical resistance to a wide range of aggressive chemicals, including…
– Long service life and stability in harsh environments, reducing the need for fre…
– High thermal, oxidative, and chemical stability due to carbon-fluorine bonds[3] – Suitable for critical applications in industries such as chemical processing, en…

Cons:
– Poor low temperature performance[3] – Significantly more costly than standard FKM materials[3] – Lower tensile strength compared to some other elastomers[4]

Custom FEP O-ring Manufacturer in China

Product Details: YOSON FEP O-rings are produced from fluorocarbon or silicone with seamless FEP jackets. They are certified to ISO 3601, BS 4528, and AS 568 standards and are available in both inch and metric sizes. These O-rings are designed to solve sealing problems due to their low friction, chemical resistance, and elastic properties. They offer excellent temperature resistance from -60°C to +260°C and are manufactured from FDA, USP Class VI compliant materials, and Sanitary 3A standards.

Pros:
– High corrosion resistance
– Excellent temperature resistance from -60°C to +260°C
– Low friction and chemical resistance
– Elastic properties for effective sealing
– Available in various colors and custom designs
– FDA, USP Class VI compliant and Sanitary 3A certified
– Used in diverse industries such as automotive, industrial, medical, and food and…

Cons:
– The FEP jacket’s slight stiffness may require custom gland design for maximum se…
– May need specific application design to maintain sealing without over-compressin…

Comparison Table

Frequently Asked Questions (FAQs)

What materials are commonly used to make o-rings in Chinese factories?

Chinese o-ring factories typically use a variety of materials, but the most common ones are rubber-based. These include Nitrile (NBR), Fluorinated Rubber (FKM or Viton), and Silicone. NBR is widely used due to its good properties and low cost, while FKM is known for its excellent comprehensive performance and is often used in high-standard sealing equipment. Silicone is popular in medical and food industries because it is tasteless, non-toxic, and resistant to extreme temperatures.

Can I customize the size, color, and design of o-rings from Chinese suppliers?

Yes, you can customize the size, color, and design of o-rings from Chinese suppliers. Many manufacturers, such as Hongjie and Savvy, offer OEM and ODM services that allow you to specify the exact dimensions, colors, and even packaging and logos according to your needs. They have a wide range of molds available, which reduces the need for additional tooling investments. You can also request custom materials and compounds to meet specific industry standards.

What are the standard sizes and international standards for o-rings in China?

O-rings in China are manufactured to various international standards, including AS568 for the USA, BS1516 for the UK, DIN 3771 for Germany, JIS B 2401 for Japan, ISO 3601 for international use, and GB 3452.1 for China. The size of an o-ring is specified by its inside diameter (ID), outside diameter (OD), and cross-section (CS). For example, a standard size might be given as ID 20 x CS 2 mm, with the outside diameter calculated as OD = ID + CS * 2.

How do Chinese o-ring manufacturers ensure the quality of their products?

Chinese o-ring manufacturers ensure quality through several measures. They use high-quality raw materials from well-known suppliers and have certified laboratories to develop and test compounds according to specific standards, such as ASTM D200. Many of these manufacturers are ISO 9001 certified, which means they adhere to strict quality management systems. Additionally, some factories offer free samples for testing before placing a large order, ensuring the product meets your requirements.

What is the typical minimum order quantity (MOQ) for o-rings from Chinese suppliers?

The minimum order quantity (MOQ) for o-rings from Chinese suppliers can vary widely depending on the manufacturer and the specific product. Some suppliers have relatively low MOQs, such as 10-100 pieces, while others may require larger orders, typically in the range of 500-50,000 pieces. It’s always best to check with the supplier directly to determine their MOQ and any associated costs or delivery times.