Ever wondered which Chinese factories make the best O-rings? From high-quality materials to fast delivery, we’ll dive into the top O-ring manufacturers in China, comparing their offerings and services to help you find the perfect fit for your needs. Let’s explore the best of the best

Xiamen Xlong Seal Co.,Ltd 厦门旭隆密封件有限公司

Product Details: Xiamen Xlong Seal Co., Ltd offers a variety of sealing products including O-rings, oil seals, and spring energized seals. O-rings are versatile sealing components used in industrial, automotive, and engineering applications. They are made from high-quality elastomeric materials and feature a circular cross-section for optimal sealing efficiency. Oil seals, also known as shaft seals, prevent fluid leakage from machines and equipment. They are designed to fit securely around the shaft and are made from durable materials like rubber, silicone, and polyurethane.

Pros:
– Versatile and widely used in various industries
– High-quality materials ensure durability and longe…
– Optimal sealing efficiency under varying pressure,…
– Resistance to chemicals and lubricants
– Ease of installation and low cost
– Excellent sealing performance minimizes fluid leak…

Cons:
– Material selection and proper installation are cru…
– May not be suitable for all types of applications…

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

Product Details: Hongju Silicone manufactures O-rings in both standard and metric sizes, using quality raw materials to prevent leakage pressure and critical torque under high pressure. They offer customization capabilities and provide free samples for testing.

Pros:
– Accommodates orders with low minimum order quantit…
– Manufactures O-rings in both standard and metric s…
– Uses only quality raw materials
– Provides free samples for testing

Perfluoroelastomer FFKM O ring Manufacturer

Product Details: The FFKM O-ring is a circular seal made of perfluoroelastomer compound, with a higher fluorine content than FKM fluoroelastomer. It provides the highest temperature (up to 620 °F) and most common chemical resistance among all rubber O-ring and gasket materials. It is used in critical applications where sealing failure is strictly prohibited, including chemical processing, energy, semiconductors, pharmaceuticals, oil and gas recovery, aerospace, and other industries.

Pros:
– Excellent chemical corrosion resistance, including…
– High temperature resistance up to 230 °C.
– Wide range of applications in harsh environments,…

Cons:
– Higher cost compared to other sealing materials.
– Specialized manufacturing process required for cus…

China O Rings Manufacturers and Suppliers

Product Details: SWKS Seal offers a variety of o-rings made from different materials, including FKM, silicone, NBR, HNBR, EPDM, and more. They provide custom molded o-rings in various sizes and specifications, such as AS568, JIS, DIN, and GB standards. The products are known for their quality materials and fine workmanship, with competitive pricing.

Pros:
– Quality materials and fine workmanship
– Competitive pricing
– Customized service catering to special requirement…
– Over 10 years of experience in manufacturing o-rin…

Cons:
– No specific cons mentioned on the website

FKM O Rings, China NBR O Ring supplier

Product Details: O-Rings and seals in various sizes, materials, and durometers. Available in AS568, Metric, and custom sizes. Materials include Kalrez, Markez, Chemraz, Simriz, Marco, FFKM, and Perfluoroelastomer.

Pros:
– Wide range of sizes and materials
– Same day shipping
– Manufacturer direct pricing
– ISO 9001:2015 certification for quality assurance

Cons:
– Limited information on specific product offerings…
– No detailed customer reviews available

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

Product Details: Xiamen Seals Technology Co., Ltd. offers a variety of rubber products, including custom silicone parts with FDA certification, Buna-N standard O-rings, spliced and vulcanized O-rings, and colored EPDM O-rings. They provide OEM and ODM services, with a complete production chain from R&D to export. They welcome customer drawings and samples to design parts meeting specific specifications.

Pros:
– High-quality molded rubber products
– Custom design options
– Complete production chain from R&D to export
– FDA-certified silicone parts

Cons:
– Limited information on specific product pricing
– No detailed comparison with competitors

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

Product Details: Savvy offers a wide range of o-rings in various sizes and shapes, including standard, encapsulated, backup-rings, and x-rings. They use popular rubber compounds like NBR, FKM, and Silicone, with NBR being the most commonly used due to its good properties and low cost. O-rings can be customized to meet specific needs, and Savvy has thousands of molds to ensure fast delivery.

Pros:
– High-quality o-rings with fast delivery
– Customizable to meet specific needs
– Wide range of materials, including NBR, FKM, and S…

Cons:
– Higher cost for custom and specialized o-rings
– Limited compatibility with certain chemicals

O Rings Manufacturer | O Rings Supplier – Hongjie Rubber Seal

Product Details: Hongjie offers custom O-rings with various sizes, from tiny (ID0.60xCS0.20mm) to big (ID1000.00 x CS 20.00mm). They use high-quality raw materials and precision molds to produce O-rings for extreme use environments. The manufacturing process includes design, tool making, color mixing, compression molding, and quality inspection. They also offer 100% checking by auto machines and have over 3500 sets of O-ring tools.

Pros:
– Smooth surface with small parting line
– Available in a wide range of sizes
– 100% checking by auto machines
– No tooling charge for most sizes
– High-quality raw materials and precision molds

Cons:
– Limited information on specific hardness options
– No detailed information on material selection proc…

High-quality O-ring Seals Manufacturer-Topa

Product Details: O-ring hydraulic fittings are designed to create a secure seal at the connection points in hydraulic systems. They are essential for preventing fluid leaks and ensuring the system operates efficiently. These fittings are engineered to withstand high pressures and significant temperature variations.

Pros:
– Reduce the possibility of leaks
– Minimize damage to threads
– Tolerate high temperatures and pressures
– Easily replaced and repaired

Cons:
– Limit temperature range; O-rings may melt if excee…
– Thread damage if O-ring is dropped or installed im…

China O-Ring Kits Suppliers – NNK oil seal

Product Details: The website offers a variety of o-ring kits, including universal type o-ring kits with 30 sizes, made from commercial grade nitrile butadiene rubber (NBR) and fluorinated rubber (FKM). These kits are suitable for professional and home use, with features like thick wall construction, strong sealing, and UV resistance. They are used in applications such as machines, excavators, and various industrial equipment.

Pros:
– High-quality materials (NBR and FKM)
– Thick wall construction for maximum protection
– UV resistant for use with liquids like oil
– Strong sealing and durable
– Available in various sizes and colors

Cons:
– Limited information on specific sizes and quantiti…
– No detailed comparison with other brands

Comparison Table

Company	Product Details	Pros	Cons	Website
Xiamen Xlong Seal Co.,Ltd 厦门旭隆密封件有限公司	Xiamen Xlong Seal Co., Ltd offers a variety of sealing products including O-rings, oil seals, and sp…	– Versatile and widely used in various industries – High-quality materials ensure durability and lon…	– Material selection and proper installation are cru… – May not be suitable for all types of appli…	www.oring-seal.com
Top 10 O-ring Manufacturers and Suppliers in China (2024)	Hongju Silicone manufactures O-rings in both standard and metric sizes, using quality raw materials…	– Accommodates orders with low minimum order quantit… – Manufactures O-rings in both standard and…		hongjusilicone.com
Perfluoroelastomer FFKM O ring Manufacturer	The FFKM O-ring is a circular seal made of perfluoroelastomer compound, with a higher fluorine conte…	– Excellent chemical corrosion resistance, including… – High temperature resistance up to 230 °C….	– Higher cost compared to other sealing materials. – Specialized manufacturing process required for…	www.jst-seals.com
China O Rings Manufacturers and Suppliers	SWKS Seal offers a variety of o-rings made from different materials, including FKM, silicone, NBR, H…	– Quality materials and fine workmanship – Competitive pricing – Customized service catering to spec…	– No specific cons mentioned on the website	www.svks-rubberseal.com
FKM O Rings, China NBR O Ring supplier	O-Rings and seals in various sizes, materials, and durometers. Available in AS568, Metric, and custo…	– Wide range of sizes and materials – Same day shipping – Manufacturer direct pricing – ISO 9001:201…	– Limited information on specific product offerings… – No detailed customer reviews available	www.o-ringsseals.com
Xiamen Seals Technology Co.,Ltd: China O-Rings, X-Rings …	Xiamen Seals Technology Co., Ltd. offers a variety of rubber products, including custom silicone par…	– High-quality molded rubber products – Custom design options – Complete production chain from R&D t…	– Limited information on specific product pricing – No detailed comparison with competitors	www.sealsmanufacturer.com
O-Rings, Rubber Seals – Best China Manufacturer & Supplier	Savvy offers a wide range of o-rings in various sizes and shapes, including standard, encapsulated,…	– High-quality o-rings with fast delivery – Customizable to meet specific needs – Wide range of mate…	– Higher cost for custom and specialized o-rings – Limited compatibility with certain chemicals	savvyrubber.com
O Rings Manufacturer	O Rings Supplier – Hongjie Rubber Seal	Hongjie offers custom O-rings with various sizes, from tiny (ID0.60xCS0.20mm) to big (ID1000.00 x CS…	– Smooth surface with small parting line – Available in a wide range of sizes – 100% checking by aut…	– Limited information on specific hardness options – No detailed information on material selection p…
High-quality O-ring Seals Manufacturer-Topa	O-ring hydraulic fittings are designed to create a secure seal at the connection points in hydraulic…	– Reduce the possibility of leaks – Minimize damage to threads – Tolerate high temperatures and pres…	– Limit temperature range; O-rings may melt if excee… – Thread damage if O-ring is dropped or inst…	www.cntopa.com
China O-Ring Kits Suppliers – NNK oil seal	The website offers a variety of o-ring kits, including universal type o-ring kits with 30 sizes, mad…	– High-quality materials (NBR and FKM) – Thick wall construction for maximum protection – UV resista…	– Limited information on specific sizes and quantiti… – No detailed comparison with other brands	www.nokcn-seals.com

Frequently Asked Questions (FAQs)

1. What are the common materials used to make O-rings in China?

You might be wondering what kind of materials are used to make O-rings in China. The most common materials include NBR (Nitrile Butadiene Rubber), FKM (Fluorocarbon Rubber, also known as Viton), and Silicone. These materials are chosen based on the application and the environment in which the O-ring will be used. For example, NBR is great for general-purpose sealing, while FKM is ideal for high-temperature applications. Silicone is often used in medical and food industries due to its non-toxic properties.

2. How do I ensure the quality of O-rings from Chinese factories?

When buying O-rings from Chinese factories, quality can be a concern. Here’s what you can do: look for factories that have a long history of producing high-quality O-rings. Check their certifications and reviews from other customers. Also, make sure to specify the material and dimensions you need, as this can affect the quality of the product. Finally, consider working with a reputable supplier who can provide you with detailed information about their manufacturing process.

3. What are the standard sizes of O-rings in China?

Standard sizes of O-rings in China vary depending on the country’s standards. For example, in China, you might use GB 3452.1, while in the USA, it’s AS568. These standards ensure that the O-rings fit perfectly into their respective applications. You can also specify the inside diameter (ID) and cross-section (CS) to get the exact size you need. This way, you can ensure a proper fit and effective sealing.

4. How do I choose the right hardness for my O-rings?

Choosing the right hardness for your O-rings is crucial for their performance. Generally, O-rings with a hardness of Shore A 70 are suitable for most applications. However, if you need higher durability, you can opt for a higher hardness like Shore A 85 or 90. On the other hand, if installation is a concern, a lower hardness like Shore A 60 might be more convenient. Always consider the pressure and temperature conditions your O-rings will face.

5. What are the common issues with O-rings from Chinese factories, and how can I avoid them?

Common issues with O-rings from Chinese factories include defects like tears or improper sizing. To avoid these issues, always inspect your O-rings carefully before use. Make sure to check for any visible defects and ensure they are properly lubricated during installation. Additionally, consider using backup rings to supplement the O-ring function, especially in high-pressure applications. Regular maintenance and proper storage can also help extend the life of your O-rings.