Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of as568 o ring in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made as568 o ring from our factory.
AS568 O Rings
AS568 O rings are precision rubber seals manufactured to standardized inch-series dimensions for reliable sealing across industrial and automotive applications. Available in FKM, NBR, EPDM, and other elastomers, they support application-specific requirements for temperature, media compatibility, pressure, and sealing performance.
Technical Specifications
Rubber Material Selection：
|
Rubber Material |
Key Performance |
|
NBR |
Mineral Oil, Hydraulic Fluid & Fuel Resistance |
|
HNBR |
Hydraulic Fluid, Heat & Wear Resistance |
|
FKM |
High-Temperature, Oil & Chemical Resistance |
|
EPDM |
Water, Steam, Ozone & Weather Resistance |
|
Silicone (VMQ) |
Wide-Temperature Flexibility & Elasticity |
|
FFKM |
High-Temperature & Aggressive Chemical Resistance |
AS568 O Ring Specifications：
|
Parameter |
Typical Reference |
|
Size Standard |
SAE AS568 inch-series |
|
Size Identification |
AS568 dash number |
|
Cross-Section - Small Series |
Typically 0.070 in (1.78 mm) |
|
Cross-Section - Intermediate Series |
Typically 0.103 in (2.62 mm) |
|
Cross-Section - Medium Series |
Typically 0.139 in (3.53 mm) |
|
Cross-Section - Large Series |
Typically 0.210 in (5.33 mm) |
|
Cross-Section - Extra-Large Series |
Typically 0.275 in (6.99 mm) |
|
Rubber Hardness |
Shore A 40–90 |
|
NBR Temperature Range |
−40°C to +120°C |
|
HNBR Temperature Range |
−40°C to +150°C |
|
FKM Temperature Range |
−20°C to +200°C |
|
EPDM Temperature Range |
−50°C to +150°C |
|
Silicone (VMQ) Temperature Range |
−70°C to +220°C |
|
FFKM Temperature Range |
−15°C to +325°C* |
*Dimensions, tolerances, hardness, and temperature ranges vary by AS568 dash number, rubber compound, and operating conditions. Confirm material compatibility and specifications against your application requirements before ordering.
Custom AS568 O Ring Manufacturing
We manufacture custom AS568 O rings based on your required dash number, drawing, sample, equipment, and operating conditions.
Custom Size & Dimensions
We can produce AS568 O rings with specified:
- AS568 dash numbers
- Inner diameter (ID) and cross-section diameter (CS)
- Dimensional tolerances
- Special dimensions based on approved drawings
- Groove and mating requirements for application compatibility
Rubber Material & Hardness
FKM and other rubber materials can be selected according to:
- Operating temperature
- Chemical or fluid contact
- Working pressure
- Required Shore A hardness
- Static or dynamic sealing conditions
Drawing / Sample
You can provide:
- CAD or technical drawings
- AS568 dash numbers and dimensional requirements
- Material and hardness specifications
- Operating conditions and sealing requirements
- Existing O ring samples or original part numbers
We use these details to evaluate dimensional compatibility and recommend suitable material and hardness options.
Sealing Performance & Special Requirements
Configurations can be evaluated according to:
- Compression and compression set requirements
- Extrusion resistance under pressure
- Friction and wear in dynamic applications
- Surface quality and dimensional consistency
- Media compatibility and expected service conditions
Application-specific testing can be arranged when required to verify sealing performance before bulk production.
OEM & Replacement Support
We support custom requirements for:
- Approved material and hardness specifications
- Dimensional tolerances and inspection criteria
- Color identification and packaging
- Labels, part numbers, and batch traceability
- Replacement O rings based on existing samples or drawings
- OEM production according to approved customer specifications
For replacement projects, we recommend verifying material compatibility, dimensions, and operating conditions before approving an alternative O ring for production.
AS568 O Ring Applications
AS568 O rings provide reliable sealing solutions for a wide range of industrial applications, with material selection and dimensional specifications tailored to each system's operating conditions and sealing requirements.
- Hydraulic Systems
- Pneumatic Equipment
- Automotive Components
- Pumps and Valves
- Industrial Machinery
- Chemical Processing Equipment
AS568 O Ring Manufacturing Capability
We operate a 5,000 m² factory with 20 production lines, 20,000+ molds, and 40+ experienced technicians, with a stated capacity of up to 10 million rubber parts per month. Our manufacturing capabilities cover mold design, rubber molding, vulcanization, and dimensional inspection, supporting AS568 O rings made to specified dash numbers, drawings, or samples.
For buyers, this production base supports both customized development and volume orders, while in-house mold resources and inspection help maintain dimensional consistency, reduce sourcing complexity, and support repeat-order requirements.
AS568 O Ring Quality Control
-
Material & Hardness Verification
Rubber compound and Shore A hardness are checked against approved material specifications to ensure compatibility with operating temperatures, sealing media, and application requirements.
-
Dimensional Inspection
Inner diameter, cross-section, outer diameter, and dimensional tolerances are inspected against the approved AS568 dash number, drawing, and applicable specifications.
-
Sealing Performance Testing
Material compatibility, compression behavior, and resistance to heat, oils, chemicals, or wear are evaluated according to the selected compound and service conditions.
-
Sample Validation & Replacement Approval
Samples are checked against existing parts, drawings, or original specifications to verify dimensional fit and material suitability before replacement approval and bulk production.
-
Batch Consistency & Traceability
Production batches are subject to quality inspection, with approved specifications and batch identification supporting consistent repeat orders and easier issue tracing.
Zhonggao's quality system includes dedicated QC personnel, laboratory testing equipment, raw-material inspection, and finished-product inspection, with IATF 16949, ISO 9001, ISO 14001, and ISO 45001 certifications.
B2B Ordering & Supply Support
Sample Development & Validation: Samples are available within 3–15 days.
MOQ & Order Flexibility: MOQ varies by O-ring size, material, tooling, and customization requirements.
Production & Delivery Lead Time: Typical delivery is 10–30 days after order details and production are confirmed.
Warranty & After-Sales Support: A 1-year quality guarantee covers manufacturing defects under normal usage conditions.
Trade Terms & International Shipping: EXW, FOB, CFR, and CIF terms are available to match different shipping arrangements.
Packaging & Order Coordination: Packaging and order details can be confirmed before production to support accurate shipment preparation, receiving, and inventory management.
FAQ
Q: How do I identify the correct AS568 O ring size for an existing seal?
A: Measure the inner diameter and cross-section, then compare the dimensions with the AS568 dash number and the equipment's groove specifications.
Q: Can AS568 O rings be used in both static and dynamic sealing applications?
A: Yes, but the rubber compound, hardness, lubrication, surface finish, and sealing design must suit the movement and operating conditions.
Q: Which AS568 O ring material is best for hydraulic oil and fuel?
A: NBR is commonly selected for mineral oils, hydraulic fluids, and fuels, while HNBR or FKM may be more suitable when higher heat or aging resistance is required.
Q: Are AS568 O rings interchangeable between different manufacturers?
A: Interchangeability depends on dimensional tolerances, material formulation, hardness, and application performance, so replacement seals should be validated before installation.
Q: What causes an AS568 O ring to swell or crack during service?
A: Swelling or cracking can result from incompatible fluids, excessive temperature, compression set, chemical aging, or unsuitable elastomer selection.
Q: How should AS568 O rings be stored to preserve service life?
A: Store O rings in sealed packaging away from direct sunlight, ozone sources, excessive heat, moisture, and chemicals that may degrade the rubber.
Q: Can AS568 O rings be used as replacements for metric O rings?
A: Not automatically, because inch-series AS568 dimensions may differ from metric sizes enough to affect groove fit and sealing performance.
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