Are you looking for the best o-ring manufacturers in China to meet your specific needs? With numerous options available, choosing the right one can be daunting. In this article, we’ll compare some of the top o-ring factories in China, highlighting their unique strengths, product offerings, and what sets them apart from the rest. Let’s dive in and find the perfect fit for your requirements.

O-ring size (no tooling charge)

Product Details: Precision Polymer Engineering (PPE) offers a wide range of O-ring sizes and types, including AS 568, DIN 11864, and RJT O-rings. These O-rings are available in various materials such as FFKM, FKM, EPDM, and Silicone, with certifications including FDA, USP, and 3-A 18-03. The O-rings can be fully molded, ensuring tighter cross-section tolerances and no joint weaknesses. They are used in critical applications like compressors, valves, oil & gas equipment, and semiconductor manufacturing.

Pros:
– Fully molded O-rings eliminate joint weaknesses, reducing the risk of premature…
– Tighter cross-section tolerances ensure a proper fit in critical equipment.
– Available in high-performance elastomer grades with excellent chemical resistanc…
– Metal detectable elastomers are available for enhanced consumer safety.
– Manufactured in cleanroom environments to minimize contamination.

Cons:
– Jointed O-rings, though less common in PPE’s offerings, can have inherent weak s…
– Higher production costs associated with fully molded and high-performance materi…
– Limited availability of certain sizes and materials may require custom tooling,…

Top 10 Silicone O-Ring Manufacturers and Suppliers in China …

Product Details: Dongguan Hongju Silicone Rubber Products Co., Ltd. is a leading custom O-ring manufacturer and wholesaler in China. They produce high-quality silicone rubber O-rings and high-temperature O-ring seals for various applications, including engines, pumps, cylinders, connectors, and valves. The company offers both standard and custom-made O-rings, with the capability to design and produce specific O-rings to meet customer requirements. Their O-rings are made from high-quality raw materials and precision molds, ensuring strong resistance to water, oil, and high temperatures. The manufacturing process includes O-ring design, tool making, color mixing, compression molding, quality inspection, and packaging according to customer specifications[3].

Pros:
– High-quality silicone rubber O-rings and high-temperature O-ring seals
– Customization capabilities to meet specific customer needs
– Strict quality control over the production process
– Compliance with international safety standards such as CE, FDA, and ROHS
– Low Minimum Order Quantity (MOQ) and rapid prototyping within 3-5 work days
– Experienced and certified staff with excellent English communication skills
– Environmentally friendly materials and processes

Cons:
– Production time can vary from 9-15 workdays depending on quantity and complexity
– Factory inspections may be limited due to epidemic restrictions, with online ins…
– Specific certification needs may require additional application processes

Ring Size Conversion Chart – International – Après Jewelry

Product Details: The ring size conversion chart provides a comprehensive guide to convert ring sizes between different international standards, including US, UK, Germany, France, Japan, and others. It includes inner diameters in millimeters, corresponding ring sizes, and instructions on how to measure your ring size at home using a strip of paper or a ring sizer.

Pros:
– Allows for accurate conversion between various international ring size standards…
– Includes instructions on how to measure ring size at home using simple tools.
– Provides inner diameters in millimeters for precise measurements.
– Helpful for shopping for rings from stores in different countries.

Cons:
– Ring sizes can be affected by factors like finger shape, ambient temperature, an…
– Some ring styles, such as eternity bands or those made of certain materials like…
– Multiple measurements may be necessary to account for minor variations in fit.

China O-Ring Kits Suppliers – NNK Oil Seal

Product Details: The Universal Type O-Ring Kit Box 30 size is a professional-quality assortment of O-rings. It includes 382 pieces of O-rings in 30 of the most popular sizes, both in inches and millimeters. The O-rings are made from commercial-grade nitrile butadiene rubber (NBR) and fluoroelastomer (FKM) materials, offering oil, chemical, and high-pressure resistance. The kit is suitable for various applications, including machines and excavators. The O-rings have a hardness range of 60-90 Shore A and can operate in temperatures from -40°C to 260°C. The kit comes in a practical resealable plastic case and is certified with ISO9001/TS16949 standards.

Pros:
– High-quality materials (NBR and FKM) providing excellent oil and chemical resist…
– Wide range of sizes (30 sizes) to fit various applications
– Suitable for high-pressure and harsh environments
– Durable and long-lasting with UV resistance
– Practical resealable plastic case for storage
– Certified with ISO9001/TS16949 standards ensuring high quality

Cons:
– Limited to specific materials (NBR and FKM), which may not be suitable for all a…
– No mention of availability for custom sizes or special orders beyond the standar…
– May require additional backup rings for elevated operating pressure environments

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

Product Details: Savvy manufactures a wide range of o-rings made from various materials including rubber, metal, and other materials. The most commonly used materials are NBR, FKM (Viton), and Silicone. NBR is widely used due to its good properties and low cost. FKM/Viton offers the best comprehensive performance and is used in high-standard sealing equipment. Silicone is often used in medical and food industries due to its FDA compliance, tastelessness, non-toxicity, and resistance to high temperatures and severe cold. The temperature range for these o-rings varies, with Silicone ranging from -70°C to 220°C. The hardness of o-rings is measured in Shore A,

typically ranging from 40 to 90, with 60-70 being the most common. O-rings are available in various colors and can be customized to meet specific needs.

Pros:
– High-temperature and FDA food grade options available
– Wide range of materials to suit different working conditions
– Low mold/tooling cost for custom o-rings
– Fast delivery options
– High precision and smooth appearance
– Good wear resistance, oil resistance, and corrosion resistance depending on the…

Cons:
– Low hardness o-rings can be prone to peeling, installation damage, extrusion, an…
– High hardness o-rings can be inconvenient to install
– Specific materials have limitations, e.g., silicone o-rings may not be suitable…

OEM O Ring Size Chart Manufacturers and Factory China

Product Details: O-ring size charts provide comprehensive dimensions and tolerances for O-rings, including standard and metric sizes. Standard sizes in the U.S. are defined by Aerospace Standard AS568B, which lists 369 sizes in six series based on cross-sectional diameter and includes 20 sizes for boss seals. Metric sizes are defined by ISO 3601-1:2002, grouping sizes into G and A series for general and aerospace applications, respectively. Key dimensions include inside diameter (ID), cross-sectional diameter (CS), and outside diameter (OD)[1][4][5].

Pros:
– Provides precise dimensions and tolerances for accurate selection
– Covers a wide range of standard and metric sizes for various applications
– Ensures compatibility with international standards and military specifications
– Offers custom and non-standard sizes for unique applications without tooling fee…

Cons:
– Complexity in choosing the correct size without proper understanding of dimensio…
– Potential for confusion between different standards (AS568B, ISO 3601-1, etc.)
– Requires careful consideration of material and application-specific conditions

O-Ring Kits – China Manufacturer & Supplier – Savvy

Product Details: Savvy supplies various o-ring kits, including standard and o-ring splicing kits. The standard kits contain 382 or 386 o-rings in 30 sizes, made from materials such as NBR, FKM, and PTFE. The o-ring splicing kits include 9 or 5 o-ring cords of different cross-sections, a splicing jig, a cutting tool, and adhesives. These kits are available in metric and imperial sizes, with hardness levels of Shore A 70 or Shore A 75. The kits are designed for maintenance and emergency repairs, allowing users to fabricate custom o-rings by cutting and gluing the o-ring cords[1].

Pros:
– Wide range of o-ring sizes and materials available
– Convenient for on-the-job repairs with included tools and adhesives
– Customizable to meet specific needs
– Cost-effective, especially for NBR material
– High-quality and accurate sealing performance with mould-pressed o-rings

Cons:
– Spliced o-rings have relatively large tolerances and may not be as precise as mo…
– Requires manual splicing which can be time-consuming and may require special ski…
– Higher cost for FKM material compared to NBR

International Ring Size Conversion Chart: US, Australia, …

China Best O-rings Suppliers and Manufacturers

China O Rings Manufacturers and Suppliers

Comparison Table

Company	Product Details	Pros	Cons	Website
O-ring size (no tooling charge)	Precision Polymer Engineering (PPE) offers a wide range of O-ring sizes and types, including AS 568, DIN 11864, and RJT O-rings. These O-rings are ava…	– Fully molded O-rings eliminate joint weaknesses, reducing the risk of premature… – Tighter cross-section tolerances ensure a proper fit in critica…	– Jointed O-rings, though less common in PPE’s offerings, can have inherent weak s… – Higher production costs associated with fully molded and high-…	www.prepol.com
Top 10 Silicone O-Ring Manufacturers and Suppliers in China …	Dongguan Hongju Silicone Rubber Products Co., Ltd. is a leading custom O-ring manufacturer and wholesaler in China. They produce high-quality silicone…	– High-quality silicone rubber O-rings and high-temperature O-ring seals – Customization capabilities to meet specific customer needs – Strict quality…	– Production time can vary from 9-15 workdays depending on quantity and complexity – Factory inspections may be limited due to epidemic restrictions,…	hongjusilicone.com
Ring Size Conversion Chart – International – Après Jewelry	The ring size conversion chart provides a comprehensive guide to convert ring sizes between different international standards, including US, UK, Germa…	– Allows for accurate conversion between various international ring size standards… – Includes instructions on how to measure ring size at home usin…	– Ring sizes can be affected by factors like finger shape, ambient temperature, an… – Some ring styles, such as eternity bands or those made of cert…	www.apresjewelry.com
China O-Ring Kits Suppliers – NNK Oil Seal	The Universal Type O-Ring Kit Box 30 size is a professional-quality assortment of O-rings. It includes 382 pieces of O-rings in 30 of the most popular…	– High-quality materials (NBR and FKM) providing excellent oil and chemical resist… – Wide range of sizes (30 sizes) to fit various applications – S…	– Limited to specific materials (NBR and FKM), which may not be suitable for all a… – No mention of availability for custom sizes or special orders…	www.nokcn-seals.com
O-Rings, Rubber Seals – Best China Manufacturer & Supplier	Savvy manufactures a wide range of o-rings made from various materials including rubber, metal, and other materials. The most commonly used materials…	– High-temperature and FDA food grade options available – Wide range of materials to suit different working conditions – Low mold/tooling cost for cus…	– Low hardness o-rings can be prone to peeling, installation damage, extrusion, an… – High hardness o-rings can be inconvenient to install – Specifi…	savvyrubber.com
OEM O Ring Size Chart Manufacturers and Factory China	O-ring size charts provide comprehensive dimensions and tolerances for O-rings, including standard and metric sizes. Standard sizes in the U.S. are de…	– Provides precise dimensions and tolerances for accurate selection – Covers a wide range of standard and metric sizes for various applications – Ensu…	– Complexity in choosing the correct size without proper understanding of dimensio… – Potential for confusion between different standards (AS568B, I…	www.seal-o-ring.com
O-Ring Kits – China Manufacturer & Supplier – Savvy	Savvy supplies various o-ring kits, including standard and o-ring splicing kits. The standard kits contain 382 or 386 o-rings in 30 sizes, made from m…	– Wide range of o-ring sizes and materials available – Convenient for on-the-job repairs with included tools and adhesives – Customizable to meet spec…	– Spliced o-rings have relatively large tolerances and may not be as precise as mo… – Requires manual splicing which can be time-consuming and may r…	savvyrubber.com
International Ring Size Conversion Chart: US, Australia, …				www.betterthandiamond.com
China Best O-rings Suppliers and Manufacturers				www.sealsmanufacturer.com
China O Rings Manufacturers and Suppliers				www.svks-rubberseal.com

Frequently Asked Questions (FAQs)

Frequently Asked Questions About O-Ring Manufacturers in China

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

O-ring manufacturers in China use a variety of materials, including Nitrile (NBR), Fluorinated Rubber (FKM or Viton), Silicone, Ethylene Propylene Diene Monomer (EPDM), and others. Each material has its own properties and is chosen based on the specific application, such as resistance to chemicals, high temperatures, or oils. For example, NBR is widely used due to its good properties and low cost, while FKM is known for its excellent comprehensive performance.

Can I get custom-made o-rings from Chinese manufacturers?

Yes, you can get custom-made o-rings from Chinese manufacturers. Companies like Dongguan Hongju Silicone Rubber Products Co., Ltd., Xiamen Flying Silicone Rubber Co., Ltd., and Tianjin SWKS Technology & Development Co., Ltd. offer OEM and ODM services, allowing you to customize o-rings according to your specifications. They can produce o-rings in various sizes, shapes, and materials to meet your specific needs.

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

The minimum order quantity (MOQ) for o-rings from Chinese manufacturers can vary. Some companies have relatively low MOQs, such as 10-100 pieces, while others may require larger orders, typically in the range of 500-5,000 pieces. It depends on the manufacturer and the specific type of o-ring you are ordering. Always check with the supplier for their MOQ requirements.

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

Chinese o-ring manufacturers ensure the quality of their products through strict quality control processes. This includes using high-quality raw materials, precision molds, and both manual and machine testing of all products. Companies like Hongju and Savvy adhere to international standards such as ISO 3601 and have certifications like ISO 9001, which guarantee a certain level of quality and reliability.

Can I get free samples from Chinese o-ring manufacturers for testing?

Yes, many Chinese o-ring manufacturers offer free samples for testing. For instance, Dongguan Hongju Silicone Rubber Products Co., Ltd. provides free samples to potential customers, allowing you to test the quality and suitability of their o-rings before placing a larger order. This is a common practice to build trust and ensure customer satisfaction.