20 Years of Industrial Sealing Excellence
Factory-direct manufacturer for both standard O-rings and custom sealing parts, serving engineers and procurement teams worldwide.
Company Overview
O-Ring Supply Co. is a factory-direct manufacturer with 20+ years of experience supplying O-rings to over 50 countries across automotive, hydraulics, oil & gas, food, pharmaceutical, and aerospace sectors. Founded over two decades ago, we have grown from a specialist sealing components manufacturer into a trusted global supplier for industries where seal failure is not an option. Our journey began with a single compression molding press and a commitment to quality that has never wavered. In the early years, we focused on serving domestic hydraulic equipment manufacturers, building our reputation on dimensional accuracy, material consistency, and honest communication. Word spread quickly through the engineering community that here was a supplier who understood sealing technology and stood behind every part that left the factory.
As demand grew, we invested systematically in manufacturing capability. We added cryogenic deflashing equipment to achieve the clean edge finishes critical for dynamic seals. We built an in-house CNC mold shop to eliminate the delays and costs of outsourcing tooling. We established a materials testing laboratory with calibrated hardness testers and dimensional measuring systems. Each investment was driven by customer feedback and a determination to control every variable that affects seal performance. Today, our facility houses compression molding presses from 15 to 200 tons, automated inspection stations, and a complete toolroom capable of producing any standard or custom mold profile.
Our customer base has expanded alongside our capabilities. We now supply both standard and custom sealing products to hydraulic system builders, chemical processing plants, food and beverage equipment manufacturers, aerospace subcontractors, oil & gas operators, medical device companies, and automotive Tier 1 suppliers across more than 50 countries. The common thread among all our customers is that they cannot afford seal failure. Whether it is a hydraulic cylinder on an offshore rig, a pharmaceutical reactor seal, or an aircraft fuel system component, the consequences of leakage or material degradation are unacceptable.
Over 20 years, we have learned that manufacturing excellence is necessary but not sufficient. Engineers and procurement teams need more than parts—they need technical partnership. When a sealing system fails or a new design requires validation, our technical team provides material recommendations, groove design reviews, compatibility data, and manufacturing feedback for custom projects. We do not just ship parts; we help solve sealing problems. This philosophy has earned us long-term relationships with customers who have stayed with us for over a decade, trusting us with their most critical sealing requirements.
Global reach has become increasingly important as our customers' supply chains have become more international. We ship directly from our factory to customers in North America, Europe, Asia-Pacific, the Middle East, and Africa. Our logistics team manages export documentation, customs declarations, and international shipping coordination so your parts arrive on time and in compliance with import regulations. We understand the urgency of maintenance shutdowns, prototype deadlines, and production ramp-ups, and we structure our production and shipping processes to meet these time-sensitive requirements.
Looking forward, we remain committed to the principles that have guided us from the beginning: quality without compromise, technical expertise you can rely on, and transparent communication at every stage. The sealing industry continues to evolve with new materials, tighter tolerances, and more demanding applications. We invest continuously in our people, equipment, and processes to stay ahead of these demands. Whether you need a single prototype seal or a multi-year production contract, our team is ready to deliver the performance and reliability your application demands.
Every order—whether 1 piece or 1 million—goes through the same rigorous quality process: incoming material verification against certificates of analysis, in-process monitoring of cure parameters and dimensional trends, 100% visual inspection for surface and edge defects, and outgoing batch certification with complete traceability documentation. This consistency is what separates a true manufacturing partner from a trading company, and it is the foundation of the trust our customers have placed in us for over 20 years.
Manufacturing Capabilities
In-House Compression Molding
We manufacture standard O-rings, custom profiles, and drawing-based sealing components through in-house compression molding — our primary production process. Our press fleet ranges from 15 to 200 tons in both vacuum and non-vacuum configurations, allowing us to optimize cavity fill and flash control across the full size range. Tooling is maintained in-house for AS568, ISO 3601, and custom dimensions, enabling rapid prototyping and eliminating third-party tooling delays. Compression molding remains our primary process because it delivers the best combination of dimensional accuracy, material integrity, and cost-effectiveness for both small prototype runs and high-volume production.
Material Testing Laboratory
Every production batch is verified through on-site hardness testing (Shore A), tensile strength measurement, compression set analysis, and chemical compatibility verification. Our laboratory instruments are calibrated annually with certificates traceable to national standards, ensuring measurement reliability for quality audits and regulatory inspections. We also perform incoming inspection on all raw material shipments, verifying compound identity through visual inspection, hardness spot-checks, and supplier certificate review before releasing materials to production. This multi-layer testing approach catches material inconsistencies before they can affect finished parts.
Custom Size Manufacturing
Any inner diameter and cross-section combination, plus support for special sealing geometries. We manufacture from 1mm cross-section up to large-diameter rings and non-standard parts for industrial flanges and pressure vessels. Our CNC mold shop can produce tooling for unique profiles including square-cut rings, X-rings, D-rings, and customer-specific geometries. First-article samples are typically delivered within 3-5 days for simple profiles, and production ramp-up follows within 7-15 days standard lead time. This flexibility makes us a single-source supplier for customers who need both standard catalog parts and specialized custom seals.
Wide Material Range
NBR, FKM, EPDM, VMQ (Silicone), PTFE and FFKM. All compound formulations are fully traceable to raw material certificates, and we maintain multiple hardness grades within each material family to match specific application requirements. Our material inventory includes standard formulations for general industrial use as well as specialized grades for food contact, pharmaceutical, aerospace, and oil & gas applications. Each material lot is received with a supplier certificate of analysis and subjected to incoming inspection before being released to production, ensuring that every finished part starts with verified raw material.
Low MOQ Production
Production flexibility from single-piece prototypes to multi-million piece annual contracts. No setup fees for standard tooled sizes, and minimal tooling charges for custom profiles due to our in-house mold shop. We understand that engineers need prototype parts for validation before committing to production volumes, and we structure our operations to support this development cycle without penalizing small orders. Our production planning system allocates press capacity dynamically, ensuring that both small urgent orders and large scheduled contracts receive appropriate priority and attention.
Global Logistics
We ship globally via DHL and FedEx express for urgent orders with 3-5 day delivery to most destinations, and via sea freight consolidation for bulk shipments to optimize logistics costs on large orders. Export documentation including material certificates, test reports, certificates of origin, and customs declarations is prepared by our logistics team to ensure smooth international transit. We ship to over 50 countries and have experience with the import requirements of major markets including the United States, European Union, United Kingdom, Japan, Australia, and the Middle East.
Certifications & Compliance
ISO 9001:2015
ISO 9001:2015 quality management system certification covers design, production, inspection and delivery of elastomeric sealing components. Maintained through annual surveillance audits by an accredited third-party registrar, with continuous improvement metrics tracked monthly and reviewed in quarterly management reviews. Our quality manual defines responsibilities and procedures for every department, ensuring consistent execution across all operations.
RoHS Compliant
All standard compounds maintain restricted substances below regulatory thresholds per EU RoHS directives. Material declarations are available for all base polymers and additives, and we monitor supplier formulations to ensure ongoing compliance as regulations evolve. RoHS documentation is provided on request for electronics, automotive, and appliance industry customers.
REACH Compliant
All material formulations comply with EU REACH regulation, with SVHC declarations available for every material grade. Our supply chain team monitors ECHA candidate list updates quarterly and engages with raw material suppliers to confirm that no new substances of very high concern are introduced into our compounds. REACH documentation is standard for all European shipments.
FDA Grade Available
FDA-compliant compounds in EPDM, VMQ and PTFE are available for food contact, pharmaceutical and medical device applications. These materials are formulated with FDA-approved ingredients and processed with controls to prevent cross-contamination. FDA compliance letters and material test reports are provided on request for food equipment OEMs and pharmaceutical processing companies.
Our Values
Every part that leaves our facility must meet specification—no borderline parts, no waived inspections, and no compromises on material integrity. This principle has built the trust that keeps our customers returning year after year.
We treat every customer relationship as a technical partnership, investing engineering time to understand your application, troubleshoot failures, and recommend improvements. Our engineers invest time to understand your application, troubleshoot failures, and recommend improvements. Your success with our seals is our success as a supplier.
We communicate honestly about lead times, capabilities, and limitations. If a requested material or dimension is not optimal for your application, we will tell you and recommend an alternative. If a requested material or dimension is not optimal for your application, we will tell you and recommend an alternative. If a delivery timeline is at risk, we notify you immediately with mitigation options.
We invest continuously in equipment, training, and process refinement. Every customer feedback, internal audit finding, and production metric is reviewed for improvement opportunity. Every customer feedback, internal audit finding, and production metric is reviewed for improvement opportunity. Standing still is not an option in an industry where application demands constantly evolve.
Global Reach
We ship factory-direct to customers in over 50 countries across six continents including the United States, Germany, United Kingdom, Japan, Australia, Canada, Brazil, UAE, India, and South Korea. Our major markets include the United States, Germany, United Kingdom, Japan, Australia, Canada, Brazil, UAE, India, and South Korea. Direct factory shipping eliminates distributor markups and reduces lead times by avoiding intermediate warehousing. Our logistics team manages all export documentation, customs declarations, and international shipping coordination.
North America
United States, Canada, Mexico with DHL/FedEx express (3-5 days) and sea freight consolidation for bulk orders.
Europe
Germany, UK, France, Italy, Netherlands, Spain, Poland, and Scandinavian countries with full REACH and RoHS documentation.
Asia-Pacific
Japan, Australia, South Korea, Singapore, Thailand, and India with regional shipping optimization and local customs support.
Middle East & Africa
UAE, Saudi Arabia, South Africa, and Egypt with experience in oil & gas industry documentation and customs requirements.
South America
Brazil, Argentina, Chile with Portuguese and Spanish language support and regional logistics coordination.
Why Work With Us
No Minimum Order Quantity
We accept orders starting from a single piece. Whether you need one prototype or one million pieces, we deliver the same attention to quality.
Standard and Custom Production
We support daily repeat orders for standard AS568 and ISO 3601 sizes, while also handling custom dimensions, special profiles, and drawing-based sealing projects.
Fast Lead Times
Standard delivery is 7-15 days. Express manufacturing available in 3-5 days for critical downtime situations.
Engineering Support
Our in-house engineers assist with material selection, groove design, and failure analysis at no extra cost.
Frequently Asked Questions
Where is your factory located?
Our manufacturing facility is based in China, and we ship factory-direct to customers worldwide. This eliminates distributor markups and reduces lead times. Our location provides efficient access to both raw material suppliers and international shipping hubs, enabling us to maintain competitive pricing while delivering consistent quality. We welcome customer visits and quality audits by appointment.
Do you provide material test certificates?
Yes, material test certificates, hardness test reports, and dimensional inspection reports are available for all orders. REACH and RoHS declarations are provided on request. For regulated industries, we can supply FDA compliance letters, USP Class VI test reports, NSF 61 documentation, and lot traceability records. REACH and RoHS declarations are provided on request. For regulated industries, we can supply FDA compliance letters, USP Class VI test reports, NSF 61 documentation, and lot traceability records. All documentation is tied to the specific production batch and is retained for a minimum of ten years.
Can you supply O-rings for food and pharmaceutical applications?
Yes, we supply FDA-compliant O-rings in EPDM, VMQ (Silicone), and PTFE. USP Class VI silicone is available for pharmaceutical and medical device applications with batch-specific biocompatibility test reports. USP Class VI silicone is available for pharmaceutical and medical device applications with batch-specific biocompatibility test reports. These materials are processed in a controlled environment with segregation protocols to prevent cross-contamination from non-food-grade compounds. Our engineering team can guide you through the material selection and documentation requirements for regulated applications.
What industries do you serve?
We serve 11 industries: hydraulics, oil & gas, chemical processing, food & beverage, pharmaceutical, aerospace, automotive, marine, semiconductor, water treatment, and general industrial sectors. Our material range and manufacturing flexibility allow us to support the diverse requirements of these industries, from standard hydraulic seals to custom aerospace components with full traceability and documentation.
Do you handle both standard and custom sealing parts?
Yes, we handle both standard AS568 and ISO 3601 sizes and custom dimensions, drawing-based sealing parts, and special profiles for OEM and replacement projects. Our in-house CNC mold shop enables us to produce tooling for custom profiles without the long lead times and high costs of outsourcing. Whether you need a catalog size from stock or a unique seal designed specifically for your equipment, we have the capability to deliver.
How do I request a sample?
Samples are available by contacting us via email or WhatsApp with your required material, size, and standard. We confirm sample availability and shipping cost within 24 hours, with samples typically shipped within 2-3 days. Samples are drawn from current production lots to ensure they represent our current manufacturing quality. For custom parts, we can provide first-article samples with dimensional reports for your evaluation before production commitment.
What is your typical production capacity and can you scale for large orders?
Yes, our facility operates multiple compression molding presses with combined capacity for high-volume production, including annual contracts exceeding several million pieces. We have successfully managed annual contracts exceeding several million pieces for automotive and industrial customers. Our production planning system allocates capacity dynamically between standard catalog orders, custom projects, and scheduled contract volumes. For large orders, we can implement dedicated press allocation, scheduled production runs, and safety stock arrangements to ensure continuous supply.
Do you offer consignment inventory or scheduled delivery programs?
Yes, we offer scheduled delivery programs with fixed pricing and guaranteed capacity allocation for customers with predictable recurring requirements. Consignment inventory arrangements can be discussed for high-volume customers. Consignment inventory arrangements can be discussed for high-volume customers who require immediate availability. These programs reduce your inventory carrying costs while ensuring that critical seals are always available when needed. Our team will work with you to design a supply program that matches your consumption patterns and cash flow requirements.
Can I visit your factory for a quality audit?
Yes, we welcome customer visits and quality audits. Our facility is available for inspection by appointment, and we routinely host audits from automotive, aerospace, pharmaceutical, and food industry customers. Our facility is available for inspection by appointment, and we routinely host audits from customers in automotive, aerospace, pharmaceutical, and food industries. During a visit, you can observe our molding operations, inspect our testing laboratory, review our quality documentation, and meet the engineering team that supports your account. Please contact us to schedule a visit at least two weeks in advance.
How do you ensure consistent quality across large production volumes?
We ensure consistent quality across large volumes through process control, statistical monitoring, and preventive maintenance. We track cure temperature, cure time, and press pressure for every batch, monitor dimensional data statistically (Cp and Cpk), and maintain our tooling in optimal condition throughout high-volume production runs. These systems are audited regularly as part of our ISO 9001:2015 certification.
Talk to our team
For standard part pricing, custom drawings, or material recommendations, contact us directly. Phone/WhatsApp: +86 138 1403 4409 | Email: yaoqingpu1983@gmail.com