JINNAI SEAL specializes in custom special design oil seals, including DC and HTC series, for industrial sealing applications.
Designed to meet specific equipment requirements, these oil seals are available in various configurations, dimensions, and rubber materials.
Our custom oil seals help prevent lubricant leakage and protect equipment from dust, dirt, moisture, and other external contaminants.
We support OEM and custom manufacturing based on technical drawings, samples, or application requirements.
Product Specifications
Specification
Details
Product Category
Special Design Oil Seals
Available Series
DC, HTC
Seal Type
Custom / Special Profile Oil Seals
Materials
NBR, FKM, EPDM, and other available compounds
Hardness
Customizable
Inner Diameter (ID)
Custom
Outer Diameter (OD)
Custom
Width / Thickness
Custom
Design
Based on drawings or samples
Application
Industrial machinery and specialized equipment
Manufacturing
Custom Manufacturing
OEM / ODM
Available
DC & HTC Series – Structural Design and Sealing Features
JINNAI SEAL offers special design rotary shaft oil seals, including DC and HTC series, for different industrial and automotive sealing requirements. Each design features a specific sealing structure to address different operating conditions and equipment requirements.
1. DC Series – Double Spring Oil Seals
The DC series features a rubber-covered outer diameter, an internal metal case, and two spring-loaded primary sealing lips. The dual-spring configuration provides radial contact force at both sealing lips, making this design suitable for applications requiring fluid separation and reliable rotary shaft sealing.
Structural Features:
Rubber-covered outer diameter for improved housing contact
Internal metal reinforcement case
Two primary sealing lips
Two garter springs for independent lip loading
Designed for applications requiring separation of two fluids
Typical Applications:
Industrial pumps
Gearboxes and transmissions
Motors and rotating machinery
Machine tools
Agricultural and construction equipment
2. HTC Series – Hydrodynamic Rotary Shaft Oil Seals
The HTC series is a specialized rotary shaft oil seal featuring a high-rise sealing lip design with hydrodynamic oil-return features. Helical return ribs or grooves are incorporated around the sealing lip to generate a pumping effect during shaft rotation, helping return migrating lubricant toward the sealed side.
This design is commonly used in automotive crankshaft sealing applications, including front and rear crankshaft oil seals, as well as selected transmission and rotating equipment applications.
Structural Features:
High-rise sealing lip profile
Reinforced sealing lip design
Helical oil-return ribs or grooves
Hydrodynamic pumping action during shaft rotation
Specially designed for rotary shaft oil retention
Typical Applications:
Engine front crankshaft seals
Engine rear crankshaft seals
Automotive transmissions
Gearboxes
Continuous-running rotating equipment
3. DC vs. HTC Oil Seals – Key Differences
Comparison
DC Series
HTC Series
Main Design
Double spring-loaded sealing structure
Hydrodynamic oil-return structure
Outer Diameter
Rubber covered
Depends on specific design
Metal Case
Internal metal reinforcement
To be confirmed by product drawing
Lip Configuration
Two primary sealing lips
High-rise lip profile; confirm exact lip count
Spring Design
Two garter springs
Depends on specific design
Special Feature
Dual-lip fluid separation
Helical oil-return ribs or grooves
Main Function
Fluid separation and rotary shaft sealing
Helps return migrating oil toward the sealed side
Typical Applications
Pumps, gearboxes, motors, and machinery
Crankshafts, transmissions, and rotating equipment
Materials & Performance
Choosing the right rubber compound is essential for oil seal performance and service life.
JINNAI SEAL offers different elastomer materials according to the operating environment.
Material
Key Properties
Typical Applications
NBR
Good resistance to mineral oils and lubricants; good abrasion resistance
General industrial equipment, pumps, and gearboxes
FKM
Excellent resistance to many oils, fuels, and chemicals; good high-temperature performance
Automotive and industrial equipment operating at elevated temperatures
EPDM
Excellent weather, ozone, and water resistance
Selected water-based systems and outdoor equipment
Key Performance Features
1. Reliable Oil Sealing
Designed to help prevent lubricant leakage around rotating shafts, supporting stable equipment operation and reducing lubricant loss.
2. Dust and Contaminant Protection
Double-lip configurations provide an additional barrier against dust, dirt, and external contaminants,
helping protect internal components.
3. Wear Resistance
Suitable rubber compounds help maintain sealing contact and resist wear during operation.
Actual performance depends on shaft surface finish, rotational speed, lubrication, and operating conditions.
4. Temperature Resistance
Different elastomer materials offer different temperature capabilities.
NBR is commonly selected for general oil-sealing applications, while FKM is often preferred for higher-temperature environments.
Actual temperature limits depend on the specific compound.
5. Material Selection for Different Media
Selecting the right elastomer is essential for compatibility with the operating medium.
JINNAI SEAL can assist with material selection based on lubricant type, chemical exposure,
temperature, and working environment.
Quality & Inspection
We apply strict quality control to every oil seal, from raw material to finished product. Incoming materials are tested for hardness, tensile strength, temperature and oil resistance. During production, curing temperature, mold dimensions and sealing-lip precision are monitored in real time. Before shipment, each batch passes dimensional measurement, visual inspection, leakage testing, and pressure and aging tests. With professional testing equipment, standardized procedures, ISO quality management and full batch traceability, every oil seal is accurate in size, tight at the lip and reliable in sealing—delivering consistent, dependable quality for our customers.
Packing & Payment & Shipping
Package:We provide standard cartons, pallets and wooden cases. Custom packaging such as custom logo print is available upon request to protect goods well for different shipments.
Payment Methods:Multi-currency settlement (CNY, USD, EUR, etc.). Multiple payment options including T/T, PayPal. Local bank transfer is available for some countries for faster transactions.
Shipping Ways:We offer international express, air freight, sea freight and railway transport. You can also appoint your own forwarder for flexible delivery arrangements.
Applications
JINNAI SEAL special design oil seals can be developed for a variety of industrial sealing requirements, including:
Industrial machinery and equipment
Hydraulic equipment and systems
Pumps and rotating equipment
Gearboxes and power transmission systems
Automotive and mechanical components
Specialized equipment requiring custom oil seals
The final application depends on the actual seal design, material, and operating conditions.
Custom Oil Seal Manufacturing
Looking for a reliable custom oil seal manufacturer ?
JINNAI SEAL provides OEM and custom oil seal manufacturing services for industrial customers, distributors, and equipment manufacturers.
We can customize:
Oil seal dimensions and profiles
Rubber materials and hardness
Sealing lip configurations
Special design requirements
Product packaging and private labeling
Whether you need replacement oil seals or custom sealing components for new equipment, our team can evaluate your drawings, samples, and technical requirements.
Contact JINNAI SEAL for custom DC and HTC series oil seals and request a quotation.
FAQs
What are DC and HTC special design oil seals?
DC and HTC are model designations used for specific oil seal designs. Their exact structures and dimensions should be confirmed through the manufacturer's drawings or product specifications.
Can DC and HTC oil seals be custom manufactured?
Yes. Custom manufacturing is available based on technical drawings, physical samples, or dimensional requirements.
What rubber materials are available?
Common options include NBR, FKM, and EPDM. Material selection depends on the sealing medium, operating temperature, and application environment.
Can I order non-standard oil seal sizes?
Yes. Custom inner diameters, outer diameters, widths, profiles, and other specifications can be evaluated for production.
What information is needed for an oil seal quotation?
Please provide the product drawing or sample, dimensions, material requirements, hardness, operating temperature, sealing medium, and estimated order quantity.
