Are you in the market for custom-made O-rings and feeling overwhelmed by the options? You’re not alone! With countless factories in China, finding the right one can be a daunting task. Understanding the top manufacturers is crucial, as it can significantly impact the quality and cost of your products. Imagine having access to the best options that ensure durability and reliability for your projects. Ready to simplify your search and make informed decisions? Join us as we explore the leading custom O-ring factories in China and help you find the perfect fit for your needs!

Custom O-ring Manufacturer and Wholesale Supplier – Hongju

Product Details: Custom silicone rubber O-rings and high-temperature O-ring seals for engines, pumps, cylinders, connectors, valves, etc.

Technical Parameters:
– Hardness tolerance: plus or minus 3-5A
– Dimensions and tolerances follow ISO3601 standards

Application Scenarios:
– Sealing various products and parts requiring resistance to water, oil, and high…
– Static and dynamic applications in machinery

Pros:
– Inexpensive and effective sealing solution
– Wide selection of stock items and customization capabilities

Cons:
– Material selection depends on specific application needs
– Potential variability in manufacturing time based on quantity

Custom Rubber Seals & O-rings Manufacturer | Haisun Rubber

Product Details: HAISUN manufactures precision O-rings such as NBR, HNBR, AMQ, FKMT, EDPM, ACM, and CR, and supplies standard O-ring parts and O-ring kits.

Technical Parameters:
– O-ring dimension accuracy tolerance up to 0.01mm
– Rubber seals accurate tolerance up to 0.02mm

Application Scenarios:
– Smartphones
– Automotive parts

Pros:
– High precision and quality control
– Wide range of materials and applications

Cons:
– Limited information on specific product limitations
– Potentially higher cost for custom solutions

Top 10 O-ring Manufacturers and Suppliers in China (2025)

Product Details: O-rings are circular cross-section sealants used to prevent leakage of liquids and gases. They are manufactured using various techniques such as injection, extrusion, and compression molding, with materials like nitrile rubber, silicone, EPDM rubber, and fluorocarbon.

Technical Parameters:
– Standard and metric sizes
– Low minimum order quantities (MOQs)

Application Scenarios:
– Automotive industry
– Aerospace and military applications

Pros:
– Wide range of products
– Customization available

Cons:
– Potentially high costs for small orders
– Quality may vary by manufacturer

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

Product Details: High-Quality Rubber O-Rings manufactured by Savvy, available in various materials including NBR, FKM, and Silicone.

Technical Parameters:
– Temperature Range: -70°C to 220°C
– Standard Hardness: Shore A 60 to 90

Application Scenarios:
– Used in hydraulic and pneumatic transmission systems
– Sealing applications for various fluids such as air, water, and oil

Pros:
– Low manufacturing cost and convenient use
– Self-sealing effect with no need for periodic adjustment

Cons:
– Difficult to achieve zero leakage in dynamic seals
– Can be prone to cutting, twisting, and breaking if used improperly

High-quality O-rings By Haisun | Custom & Standard Parts

Product Details: NBR o-ring

Technical Parameters:
– Material stand by Reach, RoHS, FDA, PAHS, TSCA
– Tolerance: ±0.02mm

Application Scenarios:
– Manufacturing various oil resistant products
– Automotive parts and household appliances

Pros:
– Heat resistance
– Oil resistance
– Water resistance

Cons:
– Poor cold and ozone resistance
– Relatively high price

Custom O-Rings, Custom Molded O-Ring China Manufacturer – Savvy

Product Details: Custom O-Rings manufactured by Savvy, available in various cross-sections and shapes.

Technical Parameters:
– Materials: NBR, HNBR, FKM/Viton, Silicone, EPDM, PTFE, FFKM
– Hardness: Shore A 60-90, Color: Black, Brown, Red, Transparent

Application Scenarios:
– Hydraulics & Pneumatic
– Oil and Gas
– Semiconductor Processing
– Aerospace
– Food Processing
– Water Filtration
– Electronic Products
– Machinery Fabrications
– Plastic Sealing
– Automotive
– Medical Equipment

Pros:
– Customizable to specific dimensions and shapes
– High-quality production with strong cost control

Cons:
– Higher price compared to standard o-rings
– Longer lead times due to custom production

Custom Seals Industry (China) Co.,Ltd. – Custom manufacturer …

Product Details: Custom Seals Industry (China) Co., Ltd. specializes in producing and developing rubber airproof pieces, including various rubber seals and molded rubber parts.

Technical Parameters:
– ISO9001 certified
– ISO/TS16949 certified

Application Scenarios:
– Automotive industry
– Home appliance industry

Pros:
– High-quality production equipment
– Over 20 years of experience in rubber airproof production

Cons:
– Limited information on specific product performance
– Potential language barriers in international communication

Ace Seal | Custom Rubber O-Rings, Gaskets, & Seals

Product Details: Ace Seal manufactures custom rubber O-rings, gaskets, seals, and other molded rubber & plastic components. They offer a wide selection of stock items at wholesale prices and customization capabilities.

Technical Parameters:
– Available in various elastomers
– Standard AS568 sizes for O-rings

Application Scenarios:
– Used in sealing applications across multiple industries
– Custom molded products for specific client needs

Pros:
– Same day shipping on standard items
– 40 years of experience in the industry

Cons:
– Limited information on specific material properties
– Customization may require longer lead times

China custom made o rings Manufacturers, Suppliers, Factory

Product Details: Custom made O rings manufactured by Semicorex, designed for various applications in semiconductor manufacturing.

Technical Parameters:
– High-purity materials used for durability and performance.
– Available in various sizes and specifications.

Application Scenarios:
– Used in semiconductor manufacturing processes.
– Applicable in sealing applications for various machinery.

Pros:
– High quality and competitive pricing.
– Strong market presence in European and American markets.

Cons:
– Limited information on specific technical specifications.
– Potential variability in availability based on demand.

Custom made o rings-Dongguan Lanhe Electronics

Product Details: Custom made O-rings from Dongguan Lanhe Electronics.

Technical Parameters:
– Material: Buna-N, Silicone
– Shore Hardness: 70 Shore A

Application Scenarios:
– Sealing applications in various industries
– Used in hydraulic and pneumatic systems

Pros:
– Customizable sizes and materials
– High resistance to oil and chemicals

Cons:
– Lead time for custom orders
– Potential higher cost compared to standard O-rings

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Comparison Table

Company	Product Details	Pros	Cons	Website
Custom O-ring Manufacturer and Wholesale Supplier – Hongju	Custom silicone rubber O-rings and high-temperature O-ring seals for engines, pumps, cylinders, connectors, valves, etc.	– Inexpensive and effective sealing solution – Wide selection of stock items and customization capabilities	– Material selection depends on specific application needs – Potential variability in manufacturing time based on quantity	hongjusilicone.com
Custom Rubber Seals & O-rings Manufacturer	Haisun Rubber	HAISUN manufactures precision O-rings such as NBR, HNBR, AMQ, FKMT, EDPM, ACM, and CR, and supplies standard O-ring parts and O-ring kits.	– High precision and quality control – Wide range of materials and applications	– Limited information on specific product limitations – Potentially higher cost for custom solutions
Top 10 O-ring Manufacturers and Suppliers in China (2025)	O-rings are circular cross-section sealants used to prevent leakage of liquids and gases. They are manufactured using various techniques such as injec…	– Wide range of products – Customization available	– Potentially high costs for small orders – Quality may vary by manufacturer	hongjusilicone.com
O-Rings, Rubber Seals – Best China Manufacturer & Supplier – Savvy	High-Quality Rubber O-Rings manufactured by Savvy, available in various materials including NBR, FKM, and Silicone.	– Low manufacturing cost and convenient use – Self-sealing effect with no need for periodic adjustment	– Difficult to achieve zero leakage in dynamic seals – Can be prone to cutting, twisting, and breaking if used improperly	savvyrubber.com
High-quality O-rings By Haisun	Custom & Standard Parts	NBR o-ring	– Heat resistance – Oil resistance – Water resistance	– Poor cold and ozone resistance – Relatively high price
Custom O-Rings, Custom Molded O-Ring China Manufacturer – Savvy	Custom O-Rings manufactured by Savvy, available in various cross-sections and shapes.	– Customizable to specific dimensions and shapes – High-quality production with strong cost control	– Higher price compared to standard o-rings – Longer lead times due to custom production	savvyrubber.com
Custom Seals Industry (China) Co.,Ltd. – Custom manufacturer …	Custom Seals Industry (China) Co., Ltd. specializes in producing and developing rubber airproof pieces, including various rubber seals and molded rubb…	– High-quality production equipment – Over 20 years of experience in rubber airproof production	– Limited information on specific product performance – Potential language barriers in international communication	www.custom-seals.com
Ace Seal	Custom Rubber O-Rings, Gaskets, & Seals	Ace Seal manufactures custom rubber O-rings, gaskets, seals, and other molded rubber & plastic components. They offer a wide selection of stock items…	– Same day shipping on standard items – 40 years of experience in the industry	– Limited information on specific material properties – Customization may require longer lead times
China custom made o rings Manufacturers, Suppliers, Factory	Custom made O rings manufactured by Semicorex, designed for various applications in semiconductor manufacturing.	– High quality and competitive pricing. – Strong market presence in European and American markets.	– Limited information on specific technical specifications. – Potential variability in availability based on demand.	www.semicorex.com
Custom made o rings-Dongguan Lanhe Electronics	Custom made O-rings from Dongguan Lanhe Electronics.	– Customizable sizes and materials – High resistance to oil and chemicals	– Lead time for custom orders – Potential higher cost compared to standard O-rings	www.lanhechina.com

Frequently Asked Questions (FAQs)

What are custom made O rings?

Custom made O rings are rubber or elastomeric seals designed to fit specific dimensions and applications. They are used to prevent leaks in various machinery and equipment. By customizing the size, material, and design, you can ensure optimal performance for your specific needs.

Why should I choose a factory in China for O rings?

Choosing a factory in China can offer competitive pricing, a wide range of materials, and advanced manufacturing technologies. Many Chinese factories specialize in O rings, providing high-quality products and efficient production processes, making them a popular choice for businesses worldwide.

What materials are commonly used for O rings?

Common materials for O rings include nitrile rubber, silicone, fluorocarbon, and neoprene. Each material has unique properties, such as temperature resistance and chemical compatibility, allowing you to select the best option for your specific application.

How do I ensure quality when ordering from a factory?

To ensure quality, request samples before placing a large order, check for certifications, and read reviews from other customers. Establishing clear communication with the factory about your specifications and quality standards is also crucial for a successful partnership.

What is the typical lead time for custom O rings?

The lead time for custom O rings can vary based on the complexity of your order and the factory’s workload. Generally, you can expect a lead time of 2 to 4 weeks, but it’s best to discuss timelines directly with the factory to get a more accurate estimate.