Custom O-Rings
Custom Rubber & Silicone O-Rings Manufacturer in China
[2025-12-17] | By Xiamen Jinshun Sealing Technology Co., Ltd. Annie Xu
Table of Contents
- What Are Custom O-Rings
- Why Custom O-Rings Matter in Industrial Applications
- O-Ring Standards and Size Customization
- Custom O-Ring Materials and Performance
- Precision Manufacturing Capabilities
- Surface Finish and Quality Control
- Custom O-Ring Types We Manufacture
- Typical Industries and Applications
- Why Choose Xiamen Jinshun Sealing Technology
- FAQs – Custom O-Rings
- Request a Quote
Custom O-Rings are precision sealing components manufactured to specific sizes, materials, hardness levels, and performance requirements. Unlike standard off-the-shelf O-rings, custom O-rings are designed to handle unique pressure, temperature, chemical, and environmental conditions.
At Xiamen Jinshun Sealing Technology Co., Ltd., we specialize in manufacturing OEM and ODM custom rubber and silicone O-rings based on customer drawings, samples, or application requirements.
In real-world industrial environments, standard O-rings often fall short. Custom O-rings help:
- Improve sealing reliability in harsh environments
- Extend product lifespan and reduce maintenance costs
- Ensure compatibility with non-standard grooves and housings
- Meet industry-specific compliance requirements
This is why industries such as automotive, aerospace, oil & gas, marine, medical, and water treatment rely on customized sealing solutions.
The international standard ISO 3601 defines a wide range of standard O-ring sizes, most commonly supplied in Nitrile (NBR) 70 Shore A.
However, different rubber materials shrink at different rates during molding:
| Material | Typical Shrinkage Rate |
|---|---|
| Nitrile (NBR 70) | ~1.8% |
| Silicone (VMQ) | 3–4% |
| EPDM | 2–3% |
| FKM (Viton®) | 1.5–2% |
Because of this, ISO tooling for NBR cannot be directly used for silicone or EPDM without compensation. Many of our customers choose custom-sized O-ring tooling to ensure accurate final dimensions.
We manufacture custom O-rings in a wide range of commercial-grade and high-performance elastomers:
| Material | Key Properties |
|---|---|
| Nitrile (NBR) | Oil resistance, cost-effective |
| Silicone (VMQ) | High/low temperature, flexibility |
| EPDM | Water, steam, weather resistance |
| FKM (Viton®) | Chemical & high-temperature resistance |
| Fluorosilicone | Fuel & solvent resistance |
| Hydrin | Oil & heat resistance |
Custom colors and Shore A hardness options are available depending on application needs.
Xiamen Jinshun Sealing offers a complete project workflow, from concept to mass production:
- Rubber injection molding
- Compression molding
- Vacuum molding for high-pressure and aerospace seals
- Custom tooling development
- Small batch, pilot runs, and large-scale production
We manufacture O-rings with cross-sections as small as 0.5 mm, and we have produced industrial seals with cross-sections up to 70 mm.
For applications requiring premium appearance and performance, we offer:
- Near-flashless O-rings using closed tooling
- Cryogenic trimming for clean edges
- Controlled vacuum molding to eliminate air bubbles
- Dimensional and visual inspection at every stage
These processes are critical for high-pressure, aerospace, and safety-critical sealing applications.
Beyond standard O-rings, we also produce a wide range of custom sealing profiles:
Custom X Rings & Quad Seals
Ideal for low-pressure or dynamic sealing where improved stability is required.
Custom Triple O-Rings
Used in demanding sealing environments requiring redundancy and enhanced performance.
Custom V Seals & V Rings
Commonly used as axial shaft seals in rotating equipment.
Custom Wiper & Scraper Seals
Designed to remove dirt and contaminants while allowing shaft movement.
Custom U, D, T, and L Section Seals
Alternative sealing profiles for special groove designs and pressure conditions.
Our custom O-rings and rubber seals are widely used in:
- Automotive and EV systems
- Aerospace and defense equipment
- Oil, gas, and hydraulic systems
- Water filtration and RO systems
- Food, beverage, and medical equipment
- HVAC and industrial machinery
Experienced custom O-rings manufacturer in China
- OEM & ODM support for global brands
- ISO-based quality control processes
- Flexible production volumes
- Competitive pricing with stable lead times
- Long-term support for distributors and wholesalers
We focus on engineering-driven sealing solutions, not just product supply.
Can you manufacture custom O-rings to drawing or sample?
Yes. We support production based on technical drawings, samples, or application data.
Do you support non-standard sizes?
Absolutely. Non-standard and ISO-based custom sizes are our specialty.
What is your minimum order quantity?
MOQ depends on material and size, but we support small batch and pilot runs.
Can you provide custom colors and hardness?
Yes. Both color and Shore hardness can be customized.
If you are looking for a reliable Custom O-Rings manufacturer, Xiamen Jinshun Sealing Technology is ready to support your project.
👉 Visit https://www.jinshunsealing.com/
👉 Send us your drawings, samples, or specifications
👉 Get a fast, professional quotation for OEM & ODM production
Let's create sealing solutions that perform reliably-every time