Seal Size Calculator
Calculate O-ring, piston seal, rod seal, and hydraulic seal dimensions with groove specifications. Get instant recommendations for squeeze percentage, stretch, and groove fill based on industry standards.
Calculate Seal Dimensions
Standard circular cross-section sealing ring
O-Ring Dimensions
ID = Inner Diameter
CS = Cross Section
OD = ID + (2 × CS)
Common O-Ring Sizes (mm)
| ID | CS | OD |
|---|---|---|
| 10.0 | 2.0 | 14.0 |
| 15.0 | 2.5 | 20.0 |
| 20.0 | 3.0 | 26.0 |
| 25.0 | 3.5 | 32.0 |
| 30.0 | 4.0 | 38.0 |
| 50.0 | 5.0 | 60.0 |
About This Seal Size Calculator
Our Seal Size Calculator is a comprehensive engineering tool designed for mechanical engineers, maintenance technicians, and procurement professionals in the manufacturing, mining, and engineering sectors across South Africa. Whether you're working with hydraulic systems, pneumatic equipment, or general industrial machinery, this calculator helps you determine the correct seal dimensions for your application.
Supported Seal Types
- O-Rings: The most common sealing element, used in static and dynamic applications. Our calculator provides ID, OD, cross-section, and groove dimensions.
- Piston Seals: Used in hydraulic and pneumatic cylinders to seal between the piston and cylinder bore.
- Rod Seals: Installed in the cylinder head to prevent fluid leakage around the piston rod.
- Wiper Seals (Scrapers): Protect the system by removing contaminants from the rod surface.
- U-Cups: Single-acting lip seals ideal for hydraulic applications with unidirectional pressure.
- V-Rings: Rotary shaft seals for protecting bearings from contamination.
Key Calculations
- Outer Diameter (OD): Calculated from ID and cross-section for O-rings.
- Groove Dimensions: Recommended groove width and depth based on ISO 3601 standards.
- Squeeze Percentage: The compression ratio applied to the seal (optimal: 10-30%).
- Stretch Percentage: The amount the seal is stretched during installation (should be ≤5%).
- Groove Fill: The percentage of groove volume occupied by the seal (optimal: 60-85%).
Industry Standards
This calculator follows international standards including ISO 3601 for metric O-rings, AS568 for imperial O-rings, and ISO 5597 for hydraulic cylinder seals. These standards ensure compatibility and reliability across different manufacturers and applications.
Applications
This calculator is used by professionals in various industries including:
- Hydraulic system maintenance and repair
- Mining equipment manufacturing
- Agricultural machinery
- Automotive and transport
- Food and beverage processing
- Pharmaceutical manufacturing
- Oil and gas industry
- Water treatment plants
Frequently Asked Questions
Need Help Finding the Right Seal?
Connect with verified seal suppliers across South Africa. Whether you need standard O-rings or custom hydraulic seals, our network of manufacturers can help.