O-Rings And Oil Seals Manufacturer In China
2026-07-09
Choosing the right sealing product is essential for maintaining equipment reliability, reducing leakage, and extending service life. Although O-rings and oil seals are among the most widely used industrial seals, they serve different purposes and require different selection criteria.
As an experienced O-rings manufacturer and oil seals manufacturer, DEF Seals provides standard and custom sealing solutions for hydraulic, pneumatic, automotive, and industrial equipment. Supplying complete technical information allows engineers to recommend the most suitable seal design and material for your application.
What Is The Difference Between O-Rings And Oil Seals?
While both products prevent fluid leakage, they are designed for different operating conditions.
O-Rings
O-rings are simple circular elastomer seals commonly used for:
- Static sealing applications
- Low-speed reciprocating motion
- Hydraulic and pneumatic systems
- Flange, groove, and fitting seals
Their sealing performance depends on proper compression inside the groove.
Oil Seals
- Oil seals, also called rotary shaft seals, are mainly designed to:
- Retain lubricants inside rotating equipment
- Prevent dust, water, and contaminants from entering
- Seal rotating or oscillating shafts
- Protect bearings and mechanical components
Oil seals usually consist of an elastomer sealing lip, a metal reinforcement case, and sometimes a garter spring for improved sealing performance.
Key Information Needed For O-Ring Or Oil Seal Selection
Providing complete application details helps reduce engineering time and improves quotation accuracy.
1. Dimensions
Dimension is the first factor for selecting the correct seal.
For custom O-rings, please provide:
- Inside Diameter (ID)
- Cross Section (CS)
- Outside Diameter (if available)
- Groove dimensions
For custom oil seals, provide:
- Shaft diameter
- Housing bore diameter
- Seal width
- Installation orientation
- Shaft surface finish if available
Engineering drawings or existing samples are always helpful.
2. Material Selection
Material compatibility directly affects seal life and performance.
Common materials include:
- NBR – General-purpose hydraulic oil and mineral oil applications
- FKM – High-temperature and chemical resistance
- PU – Excellent wear resistance for dynamic applications
- PTFE – Low friction, high temperature, and aggressive chemical environments
If material requirements are uncertain, provide the working conditions so the manufacturer can recommend a suitable option.
3. Working Conditions
Operating conditions are equally important when selecting O-rings or oil seals.
Typical information includes:
- Working medium (hydraulic oil, grease, water, chemicals, air)
- Operating temperature
- Working pressure
- Shaft speed or reciprocating speed
- Continuous or intermittent operation
- Indoor or outdoor environment
- Presence of dust, mud, moisture, or abrasive particles
These factors influence both material selection and seal structure.
4. Installation Position
The installation location determines the seal type.
Typical applications include:
- Hydraulic cylinders
- Pneumatic cylinders
- Pumps
- Gearboxes
- Electric motors
- Bearings
- Rotary shafts
- Valves
Knowing whether the seal is used for static, reciprocating, or rotary motion helps engineers recommend the appropriate sealing solution.
5. Drawings, Samples, And Quantity
For custom O-rings or custom oil seals, providing additional information speeds up the development process.
Recommended information includes:
- Technical drawings
- Existing samples
- Material requirements
- Annual purchasing quantity
- Prototype or production quantity
- Industry or equipment application
The more complete the information, the faster the manufacturer can evaluate feasibility and prepare an accurate quotation.
Why Choose DEF Seals?
DEF Seals is a professional O-rings manufacturer and oil seals manufacturer serving customers in a wide range of industries.
We provide:
- Standard and custom sealing solutions
- Multiple material options
- Technical application support
- Sample and drawing evaluation
- Stable manufacturing quality
- Fast response for custom projects
Whether you need standard products or fully customized industrial seals, our engineering team works with you to select sealing solutions that match your equipment and operating conditions.
Request A Quote
When requesting a quotation from DEF Seals, please prepare the following information whenever possible:
- Product type (O-ring or oil seal)
- Dimensions
- Material requirements
- Working medium
- Temperature and pressure
- Movement type
- Installation position
- Drawings or samples
- Required quantity
Complete technical information allows our engineers to recommend suitable sealing products quickly and provide an accurate quotation for your project.
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Contact Us
Add：Dinghao Automatic Incubation Park, South China Industrial Park, Liaobu Town, Dongguan City, Guangdong Province
Zip: 523410
Fax：0769-83260340
Email：defseals@defseals.com