Custom O Ring Manufacturer
As a leading custom O-rings manufacturer in China, we offer diverse ISO 9001-certified products in NBR, FKM, silicone, and others, specifically engineered for harsh environments.
Wholesale High-Performance Custom O Rings
With a comprehensive material library, precision mold processing capabilities, and advanced manufacturing equipment, we specialize in custom high-quality O-rings to meet diverse industrial sealing requirements.
Tolerances
O-rings with different inner diameters and wire diameters have different tolerances. Please refer to the tolerance table for details.
Hardness
The hardness range can be selected from shoreA40-90 according to different working conditions.
Wear Resistance
Coating for rubber core wear protection and seal service life extension.
Chemical Resistance
Resistance to acids, oils, and solvents.
Temperature Tolerance
Operating temperature range: -200°C to 260°C.
Aging Resistance
UV and ozone aging resistance.
Custom O-Rings We've Manufactured
Welcome to explore our customized rubber parts case studies and manufacturing&molding capabilities. Discover how our technical team address diverse customer requirements across industries.
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![Coated O Ring]()
Coated O RingCoated O-rings are composite seals with special functional coatings applied to the surface of traditional rubber O-rings. By combining the elasticity of rubber with the surface characteristics of...read more -
![Encapsulated O Ring]()
Encapsulated O RingEncapsulated O ring is a composite seal composed of a traditional rubber O-ring and an outer coating (such as PTFE, PFA or other high-performance plastics). It has the advantages of rubber...read more -
![FEP Encapsulated Silicon O Ring]()
FEP Encapsulated Silicon O RingFEP Encapsulated Silicon O Ring is a composite sealing material. It combines the elasticity of silicone with the chemical inertness and temperature resistance of FEP, and is suitable for sealing...read more -
![NBR Rubber O Ring]()
NBR Rubber O RingNBR Rubber O Ring is a ring seal made of nitrile rubber, widely used in static or dynamic sealing applications. Due to its excellent oil resistance, wear resistance and low cost, this O Ring has...read more -
![PFA O Ring]()
PFA O RingFEP O-ring is a high-performance sealing element. It combines the excellent chemical stability of FEP and the elastic sealing properties of O-ring, and is often used in harsh industrial...read more -
![PTFE Backup Ring]()
PTFE Backup RingPTFE Backup Ring is an anti-extrusion ring used to enhance the performance of elastic seals (such as O-rings and star rings). It is usually installed on the low-pressure side of the seal to...read more -
![Viton O Ring]()
Viton O RingViton O-ring is a high-performance elastic seal with excellent high temperature resistance, oil resistance and chemical corrosion resistance. It is widely used in the automotive, aerospace,...read more -
![X-RING]()
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![Y-RING]()
Encapsulated O Ring
Encapsulated O-rings are composite sealing components consisting of a traditional rubber O-ring with an outer encapsulation layer (such as PTFE, PFA, or other high-performance plastics), combining the elasticity of rubber with the chemical resistance, low friction, and other advantages of the encapsulation material. Ideal for chemical processing valves, pharmaceutical reaction vessels, and food-grade pipeline connectors below 200°C.
Temperature Range: -200°C to 260°C
Pressure Rating: Up to 50 MPa
Friction coefficient: 0.05-0.2
Chemical Compatibility: Resistant to corrosive media such as strong acids, strong
alkalis, and organic solvents
Custom Rubber O-Rings, OEM/ODM Supplier
Backed by robust OEM/ODM capabilities, our custom rubber O-rings deliver exceptional sealing performance for chemical processing, pharmaceutical, food equipment, and high-pressure applications.
Appearance & Color
Fully available in color, gloss, texture, surface treatment, etc.
OEM Manufacturing
Custom manufacturing based on customer- provided design drawings, samples, or technical specifications.
Material Selection
Exclusive O-ring material selection (e.g., FKM, PTFE, EPDM) tailored to media properties for specific applications.
Size and Structure
Custom O-rings in various sizes with special cross-sections (X/Y-type) for enhanced sealing.
Custom Mold Making
Support for mold material selection, processing technology, and mold structure design, etc.
ODM (R&D Design)
Full-range services from design to production based on customer requirements.
Collaborate with Zhonggao for Customized O-Rings
Looking for reliable custom O-rings manufacturers and suppliers in China? Contact us today! Our technical team offers 24/7 online support, free technical consultation, and sample services.
Why Choose Zhonggao As Your O-Ring Wholesale Supplier
Customizable Solutions
As a top custom O-ring supplier in China, we specialize in tailoring rubber components for global clients, including material selection, dimensions, hardness, performance requirements, and custom mold design.
Advanced Manufacturing
To ensure rapid delivery, our O-ring factory deploys advanced production and inspection equipment for the entire process — from vulcanization molding to final shipment.
Quality Control
Our QC team, with 6 full-time inspectors, uses state-of-the-art laboratory equipment for rigorous quality control, and our custom O-rings are certified by IATF 16949 and other authoritative international standards (e.g., ISO 9001, FDA).
Technical Support
Our professional technical team specializes in providing custom sealing design and selection for your products, along with expert advice for comprehensive sealing design solutions.
FAQ
Q: What are the advantages of Encapsulated O Rings over regular O Rings?
A: Their main advantages include wider temperature range, lower friction coefficient, better chemical resistance and longer service life.
Q: What are the main rubber materials for O-rings?
A: Zhonggao (a famous O-ring brand in China) primarily utilizes rubber materials including nitrile rubber (NBR), fluororubber (FKM), silicone rubber (VMQ), and perfluororubber (FFKM).
Q: What is the most common cause of O-ring failure?
A: Common installation errors for O-rings include:
• Insufficient compression (<15%), leading to leakage;
• Scratches or distortion during fitting (especially for PTFE-encapsulated types);
• Mismatched groove dimensions (e.g., undersized ID causing over-stretching);
• Failure to apply suitable lubricant (accelerating wear in dynamic sealing applications).
These issues directly result in sealing failure or reduced service life.
Q: Can O-rings be exposed to direct sunlight?
A: No. Ultraviolet (UV) radiation in sunlight accelerates rubber degradation, leading to O-ring hardening, cracking, and elasticity loss—thereby drastically reducing service life.
Q: Do you provide testing and auditing services?
A: Yes, we can assist you in obtaining accredited product testing and third-party factory audits.
Q: Can we request samples? Are there any charges?
A: Of course, samples are free of charge; however, shipping costs will apply.
Q: What is the lead time for samples?
A:The sample lead time is 3 to 15 days.
Q: How long is the delivery time after order confirmation?
A: The delivery time is approximately 10 to 30 days after order details and production are confirmed.
Q: What is your after-sales policy?
A: We provide a 1-year quality guarantee that covers manufacturing defects under normal usage conditions.
Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is well-known as one of the leading o ring manufacturers and suppliers in China. Please feel free to wholesale custom made o ring at competitive price from our factory. For more company information, contact us now.
o ring sizing cone, rectangular o ring, neoprene rings-
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Creating Your Custom Rubber Parts Coupled with Our Masterly Manufacturing
OEM/ODM Services
Material Selection
Free Samples
Sample Delivery in 3-15 Days
Free Technical Consultation
24-Hour Response