Hongjie Sealing Technology molds O-rings for custom and OEM programs at its Shenzhen factory. The process starts with a customer drawing or approved physical sample and continues through tooling, first-article approval and batch production.
Established in 2001, the company operates under IATF 16949:2016 and ISO 13485:2016 certification. The plant supports injection molding, compression molding and die-cutting for automotive, medical, appliance, hydraulic and industrial OEM programs. Submit a drawing or sample to start a quote.
All O-ring compounds are formulated and molded in-house using injection molding, compression molding and die-cutting lines. The engineering team draws on a library of 200+ proprietary rubber formulations.
Standard material options include:
Compounds are rated from –60°C to +325°C and tested against 500+ fluids, gases and chemicals. Material selection is matched to the actual working medium.
The same tooling and process base also supports custom molded rubber manufacturing services and custom silicone molded components and parts when an OEM assembly needs a matched O-ring and molded housing seal from one supplier.
A custom O-ring order starts with a drawing, specification sheet or physical sample submitted for technical review. The engineering team confirms the inside diameter, cross-section, groove data, hardness and compound before issuing a quote and cutting the mold to the approved geometry.
First-article samples are checked against the drawing before batch production is released. Each production run is then inspected according to the agreed acceptance plan and packed with batch, quantity and customer part-number identification for export.
| Item | Typical Basis |
|---|---|
| MOQ | Confirmed after technical review of geometry, compound and tooling status |
| Tooling Lead Time | Confirmed after drawing and compound review |
| Sample Turnaround | 3–5 business days for functional prototypes |
| Mold Cost Tier | Varies by cavity count and part complexity; confirmed at quote stage |
Buyers deciding between molded and die-cut construction for washer- and disc-style seals can compare tooling and cost trade-offs across both processes before committing to a mold. A drawing can be submitted directly through the Parts Manufacturer intake to start a quote.
Precision O-ring tooling holds down to ±0.02mm on critical dimensions, with statistical process control targeting Cpk > 1.33 across production runs — the difference between a batch that fits a groove on paper and one that fits it consistently across a full production order.
| Dimension Range | Standard Tolerance | Precision Tolerance |
|---|---|---|
| 0–10mm | ±0.10mm | ±0.02mm |
| 10–25mm | ±0.15mm | ±0.05mm |
| 25–50mm | ±0.20mm | ±0.08mm |
| 50–100mm | ±0.25mm | ±0.10mm |
For a project with tight groove tolerances, request a quote with the drawing and groove data attached.
Miniature O-rings start at ID 0.60 mm × CS 0.20 mm. Large non-standard rings can reach ID 1,000 mm × CS 20 mm, subject to technical review. The available hardness range is 10–90 Shore A.
Buyers using catalog dash numbers instead of a custom drawing can source directly from AS568 O-rings by dash size and material, with sizing based on AS568A and metric tables.
Custom cross-sections, non-standard inside diameters and non-black colors are molded and inspected under the same process controls, including technical review, first-article approval and batch inspection.
Production operates under IATF 16949:2016 certification for automotive programs and ISO 13485:2016 certification for medical-device programs. UL certification supports electrical applications, while FDA- and NSF-compliant material options are available for food-contact, water-contact and sanitary sealing.
These are key qualification points that procurement teams typically confirm before releasing a custom O-ring tool to a new supplier.
For bulk and repeat OEM programs, Hongjie provides:
Buyers with silicone-specific bulk requirements can review bulk silicone O-rings for OEM supply programs, sized and packaged in the same way as custom compound orders.
O-ring capability sits alongside other molded and standard-sizing sealing products built on the same tooling and inspection base:
Flexible silicone O-rings for clean, hot, and weather-exposed sealing applications.
White silicone O-rings for visually clean and contamination-sensitive assemblies.
Standard metric and JIS profiles for equipment built to non-AS568 dimensions.
High-temperature and chemical-resistant sealing for demanding industrial environments.
Explore Hongjie's materials, tooling, molding, inspection, and OEM production capabilities.
Buyers sourcing washer-style or medical silicone parts instead of round-section O-rings can review Custom Rubber Washers & Sealing Discs or Medical Silicone Molded Seals for OEM Assemblies.
For potable-water fittings, valves and faucets, see plumbing O-rings in FDA/NSF-compliant compounds.
Submit a drawing, groove dimension or physical sample to start a custom O-ring quote, or ask about qualifying an existing part for repeat OEM supply. Start a project discussion with the engineering team.
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