O-Ring Manufacturers in China: Company Reviews and Buying Guide

This guide reviews nine companies that buyers can consider when searching for O-ring manufacturers China, O-ring China, China O-ring, O-ring in Chinese or Oring China suppliers. 

China is one of the world's major manufacturing bases for rubber seals, silicone components, O-rings, gaskets and custom elastomer products. For OEMs, distributors, maintenance companies and industrial buyers, sourcing from China can provide access to a broad range of standard and customised sealing products.

However, not every company listed as an O-ring manufacturer China supplier has the same production capabilities. Some manufacturers focus on standard O-rings, while others specialise in silicone O-rings, FKM, EPDM, HNBR, FFKM, hydraulic seals, custom moulded rubber parts or precision sealing components.

What Is an O-Ring?

F58 Heat-Resistant Silicone Gasket for Water Heaters

An O-ring is a circular elastomer sealing element designed to prevent leakage between two mating surfaces. O-rings are widely used in hydraulic and pneumatic systems, automotive components, pumps, valves, industrial machinery, electronics, appliances, medical equipment and many other applications.

The O-ring's simple geometry makes it relatively easy to manufacture, but material selection and groove design are critical to sealing performance. A low-cost O-ring made from the wrong elastomer can fail much earlier than a correctly specified product.

Why Source O-Rings from China?

China has a large ecosystem of rubber and silicone manufacturers supporting standard and custom sealing products. Buyers can source metric O-rings, AS568 inch-size O-rings, custom dimensions, silicone O-rings, FKM/Viton O-rings, EPDM, NBR, HNBR, FFKM and other specialist sealing materials.

Another advantage is the availability of custom tooling and OEM manufacturing. Many Chinese factories can manufacture O-rings according to drawings, samples, dimensions, hardness requirements and application specifications.

However, purchasing teams should evaluate the complete supplier rather than choosing solely according to unit price. Tooling, material certificates, inspection, packaging, shipping, rejected-product risk and communication should all be included in the supplier evaluation.

How to Choose O-Ring Manufacturers in China

Material Selection

The first question should be which elastomer is appropriate for the application. Common materials include NBR, EPDM, FKM, HNBR, silicone/VMQ and FFKM.

NBR is commonly considered for oil and hydraulic applications. EPDM is widely used where water, weathering and steam resistance are important. FKM is suitable for many high-temperature and chemical-resistance applications. Silicone offers a wide temperature range and flexibility but is generally not the first choice for petroleum oils and fuels. FFKM is used for particularly demanding chemical and temperature environments.

Hardness

O-ring hardness is normally specified in Shore A. A common mistake is to select hardness without considering pressure, extrusion gap, groove design and assembly conditions.

Temperature

The operating temperature should be evaluated together with the exact compound. The nominal temperature range of an elastomer does not automatically mean that every compound made from that elastomer will perform identically.

Pressure and Application

Static and dynamic applications can require different sealing solutions. Hydraulic and pneumatic systems may require consideration of extrusion, backup rings, lubrication, reciprocating movement and pressure cycling.

Standards and Dimensions

Buyers may require AS568, ISO 3601, DIN, JIS, GB/T or custom dimensions. The supplier should confirm dimensional tolerances and inspection methods before mass production.

Quality Documentation

For industrial, food, medical, semiconductor or other regulated applications, request material certificates, inspection reports and applicable compliance documents. Do not assume that a company's general certification automatically applies to every product or compound.

1. Xiamen Xlong Seal Co., Ltd.

Website: oring-seal.com

Address: No. 75 Tian'an Road, Jimei District, Xiamen, Fujian, China.

Phone: +86-592-5171076

Mobile: +86 158 8020 6572

Email: admin@oring-seal.com

Xiamen Xlong Seal Co., Ltd. is a China-based sealing manufacturer with a broad O-ring portfolio. Its product categories include NBR, FKM, EPDM, HNBR, silicone, FVMQ, AFLAS, FFKM, encapsulated O-rings, large-size O-rings and other sealing products. The company states that it has focused on elastomer seals for more than 10 years.

Its silicone O-ring portfolio includes standard and customised products, with options for different sizes, hardness levels, colours and international standards. The company also lists AS568, ISO 3601, BS4518 and JIS B2401 silicone O-rings.

Review: Xlong is a strong candidate for buyers searching for O-ring China suppliers with a broad material portfolio. Its ability to supply both standard and specialist sealing products can be useful for distributors and industrial OEMs that need multiple elastomer types from one supplier.

The company also provides encapsulated O-rings, including FEP-encapsulated silicone and FKM options, which can be relevant for chemical-resistant applications.

Best suited for: standard O-rings, silicone O-rings, FKM, EPDM, HNBR, FFKM, encapsulated O-rings and custom sealing products.

2. LaBon Sealing Technology (Shanghai) Co., Ltd. – WRKR Seal

Website: o-ringseal.com

Address: No. 30, Lane 1698, Wangyuan Road, Fengxian District, Shanghai, China.

Phone / WhatsApp / WeChat: +86 131 2275 5841

Email: sales@o-ringseal.com / info@o-ringseal.com

LaBon Sealing Technology operates the WRKR Seal business and positions itself as an industrial O-ring and sealing supplier. Its product range covers standard O-rings, custom sizes and different elastomer materials for industrial sealing applications.

The company states that customers can provide dimensions such as inside diameter and cross-section together with material and application requirements for quotation. It also offers international shipping.

Review: WRKR Seal is worth considering for buyers looking for a direct China supplier that can handle both standard and custom O-ring requirements. Its Shanghai location can also be relevant for international procurement teams familiar with the city's industrial and logistics infrastructure.

For a first order, buyers should request samples and material information before committing to large quantities.

Best suited for: industrial O-rings, standard sizes, custom O-rings and international B2B supply.

3. Shanghai MaiZhiHua Sealing Element Co., Ltd. – MZH

Website: mzhseal.com

Address: Factory 3, No. 18 Changting Road, Fengxian District, Shanghai, China.

Phone: +86 21 37525975

Mobile: +86 15901833239

Email: yihan@mzhseal.com

MZH specialises in oil seals, O-rings and rubber components. The company states that its products are used in automotive and industrial applications including transmissions, engines, pumps, construction machinery, agricultural equipment, wind-power gearboxes and electronic products.

One notable feature is its focus on automated inspection and packaging. The company also states that its quality system follows international and automotive-related standards and that it has ISO/TS16949 certification information published on its website.

Review: MZH is particularly interesting for automotive and industrial buyers where consistency and repeatability are important. The company's O-ring products cover automotive air-conditioning and other vehicle-related sealing applications as well as industrial machinery.

For automotive OEM sourcing, buyers should request current certificates and confirm whether the exact production line and material meet the customer's current specification.

Best suited for: automotive O-rings, industrial rubber components, oil seals and high-volume applications.

4. Ningbo Robon Sealing Co., Ltd.

Website: rb-oring.com

Address: No. 65, Donghuan Road, Fenghua, Ningbo, China.

Phone: +86-574-88952320

Email: sales@rb-oring.com

Ningbo Robon Sealing is a rubber products manufacturer specialising in O-rings, rubber seals, square rings, O-ring cord, Quad rings, flat washers and customised rubber components. Its material portfolio includes NBR, EPDM, FKM, AFLAS, HNBR, silicone and FFKM.

The company also lists testing equipment including hardness testers, projectors, image measurement equipment and tensile testing machines.

Review: Robon is suitable for buyers that need a broad range of elastomer sealing products rather than silicone O-rings alone. Its Ningbo location is also relevant to exporters and importers working with China's established manufacturing and port infrastructure.

The supplier is worth shortlisting for OEM projects requiring several rubber compounds and custom shapes from the same manufacturer.

Best suited for: rubber O-rings, silicone O-rings, FKM, EPDM, FFKM, custom rubber parts and industrial seals.

5. Ningbo Savvy Rubber & Plastics Co., Ltd.

Website: savvyrubber.com

Address: No. 487 Yangmuqi Road, Hi-Tech Zone, Ningbo, China.

Phone: +86-13732177877

Email: sales@savvyrubber.com

Ningbo Savvy Rubber & Plastics is a manufacturer specialising in rubber seals and custom rubber parts. Its product portfolio includes O-rings, X-rings, V-rings, backup rings, rubber strips, oil seals, bonded seals and custom rubber components.

The company states that it provides a one-stop service covering mould design, mass production and logistics shipment. Its products are used in sectors including automotive, hydraulics, pneumatics, medical devices, electronics, food and pharmaceutical equipment, construction, marine and renewable energy.

Review: Savvy is a useful option for buyers looking for an OEM-oriented supplier rather than a simple catalogue distributor. Its combination of tooling, manufacturing and logistics can simplify projects involving customised rubber sealing parts.

For critical applications, procurement teams should ask for current material certificates, production samples and dimensional inspection records.

Best suited for: custom O-rings, rubber seals, OEM components, hydraulic/pneumatic applications and industrial parts.

6. Dongguan Ruichen Sealing Co., Ltd.

Website: o-ringsseals.com

Address: Dongguan, Guangdong, China.

Phone: +86 18024335478

Email: Aaron@dgork.com

Dongguan Ruichen Sealing focuses on rubber O-rings, gaskets, rubber balls, grommets and customised rubber parts. The company's website states that it operates two factories and supplies sealing products for industrial applications.

The company is particularly relevant to buyers searching for FKM and NBR O-rings, while its wider custom rubber manufacturing portfolio allows customers to source different sealing components from the same supplier.

Review: Ruichen can be considered for buyers seeking a Guangdong-based rubber sealing manufacturer. Dongguan is a major manufacturing hub, which can be advantageous for projects that require integration with other plastic, electronics or mechanical components.

Before placing a production order, buyers should verify the exact factory address, current production capacity, quality certificates and material source.

Best suited for: NBR O-rings, FKM O-rings, gaskets, grommets and customised rubber components.

7. Dongguan Lanhe Electronics Co., Ltd. – Lanhe Seals

Website: lanhechina.cn

Phone: +86 13829272978

Email: Emilyke@lanhechina.com

Lanhe Seals describes itself as a Chinese manufacturer of rubber sealing products, O-ring kits, oil seals and related components. The company states that it has around 20 years of experience in the rubber sealing industry and supplies standard and customised sealing products internationally.

Its portfolio includes standard metric O-rings, custom moulded O-rings, hydraulic seals, piston and rod seals, automotive oil seals, valve stem seals and other sealing components.

The company states that it maintains a large inventory of standard metric O-rings and sealing accessories, which can be useful for buyers requiring standard replacement components rather than fully customised products.

Review: Lanhe is worth considering for distributors and maintenance suppliers that require a broad catalogue of standard sealing products. It may also be suitable for OEM buyers requiring custom rubber seals.

When comparing Lanhe with other Oring China suppliers, buyers should separate standard-stock products from made-to-order products because lead times and minimum order quantities can be very different.

Best suited for: standard O-rings, O-ring kits, oil seals, hydraulic seals and custom rubber sealing products.

8. Hebei Xingtai Xinsitong Seal Co., Ltd.

Website: xtxstyf.com

Address: Near the intersection of Heping Road and Yongkang Street, Renze District, Xingtai City, Hebei, China.

Hotline: +86 319 7562888

Mobile / WhatsApp: +86 15630973003

Email: amy@xtamk.com / betty@xtamk.com

Hebei Xingtai Xinsitong Seal is a Chinese industrial sealing manufacturer specialising in oil seals, O-rings, shock-absorbing rubber products and other sealing components. The company states that it has nearly 20 years of experience in the sector and sells to both domestic and international customers.

Its O-ring portfolio is part of a wider range of industrial sealing products. This can be useful for customers that need O-rings together with oil seals and other rubber components.

Review: Xinsitong can be considered by buyers looking for a China-based industrial seal manufacturer with a broader product range. It may be particularly relevant for machinery, automotive and maintenance applications.

For export orders, buyers should confirm packaging, inspection procedures, export documentation and shipping terms before production.

Best suited for: industrial O-rings, oil seals, rubber components and replacement sealing products.

9. MINH FAST – Vietnam Alternative to O-Ring Manufacturers China

Website: vietnamsiliconerubber.com

Head Office: No. 1/19 Luong Khanh Thien Street, Tuong Mai Ward, Hanoi City, Vietnam.

Factory: Km 33 – DT 379, Van Giang, Hung Yen, Vietnam.

Phone / Zalo / WhatsApp: +84 8899 14599

Email: Thamsiliconetkv@gmail.com / Minhfastsales@gmail.com

MINH FAST is not a China-based manufacturer. It is a Vietnamese silicone and rubber manufacturer included here as an alternative for international buyers comparing Asian production sources.

MINH FAST states that it was established in 2010 and provides custom silicone manufacturing, silicone mould manufacturing and industrial rubber products. Its product portfolio includes silicone seals, gaskets, O-rings and customised silicone components.

The company states that it supports custom manufacturing based on drawings, samples and technical specifications. Its published capabilities include compression moulding, injection moulding, LSR technology, CNC mould machining and OEM/ODM manufacturing.

MINH FAST also publishes a silicone O-ring and rubber seal manufacturing process covering technical consultation, mould development, prototype production, compression or injection moulding, inspection and packaging.

Review: For buyers searching specifically for o ring in Chinese suppliers, MINH FAST should not be presented as a Chinese supplier. Instead, it provides a useful Vietnam alternative for companies comparing manufacturing costs, supply-chain diversification and OEM production outside China.

This can be particularly relevant for custom silicone O-rings, silicone gaskets and other moulded silicone components where the buyer already has CAD drawings or samples and is evaluating multiple Asian production locations.

Best suited for: custom silicone O-rings, silicone seals, gaskets, OEM/ODM silicone products, custom moulding and international production.

Comparison of O-Ring Manufacturers in China

Company	Location	Main O-Ring Capability	Best For
Xiamen Xlong Seal	Xiamen, Fujian	O-rings, silicone, FKM, EPDM, HNBR, FFKM	Broad sealing portfolio
LaBon / WRKR Seal	Shanghai	Standard and custom O-rings	Industrial and international sourcing
MZH	Shanghai	Automotive O-rings and rubber parts	Automotive and industrial applications
Ningbo Robon	Ningbo, Zhejiang	O-rings and custom rubber components	Multi-material OEM sourcing
Ningbo Savvy	Ningbo, Zhejiang	O-rings, X-rings, V-rings, custom parts	OEM and custom sealing
Dongguan Ruichen	Dongguan, Guangdong	NBR, FKM O-rings, gaskets	Industrial rubber components
Lanhe Seals	Dongguan, Guangdong	Standard and custom O-rings	Distributors and industrial seals
Xinsitong Seal	Xingtai, Hebei	O-rings, oil seals and rubber parts	Industrial and automotive seals
MINH FAST	Hanoi / Hung Yen, Vietnam	Silicone O-rings, seals and custom moulding	Alternative Asian OEM sourcing

China O-Ring vs Silicone O-Ring: What Is the Difference?

The phrase China O-ring describes the manufacturing location rather than the material. A Chinese O-ring can be made from NBR, EPDM, FKM, silicone, HNBR, FFKM or another elastomer.

Silicone O-rings are generally selected for their flexibility, temperature performance and suitability for certain food, medical, electrical and general industrial applications. However, silicone is not universally suitable for every sealing environment.

For applications involving petroleum oils, fuels or certain aggressive chemicals, other elastomers may be more appropriate. The final choice should be based on temperature, pressure, media compatibility, movement and groove design.

How to Request a Quote from China O-Ring Suppliers

A professional RFQ helps suppliers provide accurate quotations and prevents different manufacturers from quoting technically different products.

At minimum, include:

• O-ring inside diameter.
• Cross-section diameter.
• Material requirement.
• Shore A hardness.
• Colour requirement.
• Quantity per order.
• Annual forecast quantity.
• Static or dynamic application.
• Operating temperature.
• Operating pressure.
• Fluid, gas or chemical exposure.
• Required standard such as AS568 or ISO 3601.
• Dimensional tolerances.
• Packaging requirements.
• Required certificates and inspection reports.

If the product is custom, provide a 2D drawing, 3D CAD file or physical sample whenever possible.

How to Compare O-Ring Manufacturers China Quotes

The cheapest quotation is not necessarily the lowest total cost. Buyers should compare the same material, hardness, dimensions, tolerance, packaging and inspection requirements.

A proper supplier comparison should include:

Evaluation Factor	What to Check
Material	Exact elastomer and compound specification
Hardness	Shore A and tolerance
Dimensions	ID, cross-section and dimensional tolerance
Tooling	Mould cost, cavity number and ownership
Quality	Inspection procedure and test reports
Certification	Relevant ISO, FDA, food, medical or industry documentation
MOQ	Minimum order quantity
Lead Time	Tooling, samples and mass production
Packaging	Bulk, individual or customised packaging
Shipping	Incoterm, freight and delivery time

Questions to Ask O-Ring Manufacturers Before Ordering

Before approving a supplier, buyers should ask several practical questions:

• Is the O-ring manufactured in your own factory?
• Which silicone or rubber compound will be used?
• Can you provide the material data sheet?
• What hardness tolerance can you guarantee?
• What dimensional standard do you follow?
• Can you manufacture custom sizes?
• Can you provide a production sample before mass production?
• How do you inspect O-rings for flash, dimensional defects and surface damage?
• Can you provide batch traceability?
• What is the tooling cost and mould life?
• What is the minimum order quantity?
• What is the standard production lead time?
• Can you provide export packaging?
• Which compliance certificates are available for the exact compound?

Conclusion: Choosing the Right O-Ring China Supplier

The Chinese O-ring manufacturing market offers a wide selection of suppliers ranging from general rubber seal manufacturers to highly specialised sealing companies. Xlong provides a broad range of elastomer O-rings and specialist sealing products, while WRKR focuses on industrial O-ring supply and custom sizing.

MZH is particularly relevant to automotive and industrial applications. Ningbo Robon and Ningbo Savvy offer broad custom rubber portfolios, while Ruichen and Lanhe are additional options for industrial O-rings and sealing components. Xinsitong provides another option for buyers requiring O-rings alongside oil seals and other rubber products.

For international buyers, the best sourcing strategy is not simply to search for the lowest-priced O-ring China supplier. Instead, define the application, select the correct elastomer, establish the required dimensional standard, request samples and verify production quality before moving to large-scale orders.

Companies comparing O-ring manufacturers China can also consider Vietnam as an additional manufacturing location. MINH FAST provides custom silicone O-rings, seals, gaskets and moulded silicone products for international OEM customers, making it a potential alternative for businesses seeking to diversify Asian sourcing.

Ultimately, the right supplier is the one that can consistently deliver the required material, dimensions, performance, quality documentation and production volume at an acceptable total landed cost.