Created on 02.12
SAE Flange: O-Ring Size Selection
In SAE flange connections, O-rings play a crucial role in ensuring a secure and leak-free seal, especially in high-pressure hydraulic systems. Selecting the correct O-ring size is essential for maintaining system efficiency, preventing leaks, and extending the service life of hydraulic components. This article explores the key factors in choosing the right O-ring size for SAE flanges, standard sizing guidelines, and best practices for installation.
1. The Importance of O-Ring Selection in SAE Flanges
O-rings serve as sealing elements between the flange surface and mating component, preventing hydraulic fluid leakage. The correct O-ring size ensures:
• Optimal sealing performance under high pressure.
• Reduced wear and deformation, enhancing durability.
• Compatibility with hydraulic fluids, preventing material degradation.
Choosing the wrong O-ring size may lead to fluid leaks, premature wear, and system inefficiency, increasing maintenance costs and downtime.
2. Standard O-Ring Sizes for SAE Flanges
SAE flange O-rings are standardized according to SAE J518 and ISO 6162, ensuring compatibility with Code 61 (standard pressure) and Code 62 (high pressure) SAE flanges.
Common O-Ring Size Chart for SAE Flanges (AS568 Standard)
SAE Flange Size | O-Ring Dash Number (AS568) | Inside Diameter (ID) (inch/mm) | Cross-Section (CS) (inch/mm) |
1/2” | -908 | 0.737” (18.72 mm) | 0.103” (2.62 mm) |
3/4” | -912 | 0.978” (24.84 mm) | 0.103” (2.62 mm) |
1” | -916 | 1.225” (31.12 mm) | 0.103” (2.62 mm) |
1-1/4” | -919 | 1.487” (37.77 mm) | 0.103” (2.62 mm) |
1-1/2” | -922 | 1.737” (44.12 mm) | 0.103” (2.62 mm) |
2” | -926 | 2.225” (56.52 mm) | 0.139” (3.53 mm) |
2-1/2” | -932 | 2.737” (69.55 mm) | 0.139” (3.53 mm) |
3” | -936 | 3.237” (82.23 mm) | 0.139” (3.53 mm) |
4” | -944 | 4.237” (107.65 mm) | 0.139” (3.53 mm) |
For high-pressure Code 62 SAE flanges, O-ring sizes may differ slightly due to increased sealing requirements.
3. Factors to Consider When Choosing an O-Ring for SAE Flanges
1. Material Compatibility
O-rings are available in various materials, including:
• Nitrile (NBR): Excellent resistance to hydraulic oils, commonly used in industrial applications.
• Fluorocarbon (FKM/Viton®): High-temperature and chemical-resistant, ideal for demanding environments.
• EPDM: Suitable for water-based fluids but not oil-based hydraulic systems.
2. Operating Pressure and Temperature
• Standard pressure SAE Code 61 flanges typically use standard O-rings.
• High-pressure SAE Code 62 flanges require reinforced O-rings with higher compression resistance.
3. Installation and Groove Fit
• Ensure the O-ring groove is clean and free of debris.
• Avoid overstretching the O-ring during installation to maintain proper sealing.
• Apply lubrication (compatible with O-ring material) to reduce friction and prevent damage.
4. Reliable SAE Flange O-Rings from JETE FITTINGS
JETE FITTINGS offers a complete range of SAE flange O-rings, manufactured to SAE J518 and ISO 6162 standards for superior sealing performance. Our O-rings are designed to withstand high pressure, extreme temperatures, and hydraulic fluids, ensuring long-term reliability in industrial and hydraulic applications.
5. Conclusion
Selecting the correct O-ring size and material is essential for maintaining a leak-free SAE flange connection. By following SAE J518 and AS568 standards, engineers can ensure compatibility, prevent system failures, and extend the lifespan of hydraulic components.
For high-quality SAE flange seals and fittings, trust JETE FITTINGS to provide precision-engineered solutions for your hydraulic system needs.
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