High-Quality O-Rings

This O-ring is a simple yet critical sealing component. High-Quality O-Rings from our factory are designed for hydraulic and pneumatic systems. Diameters range from 2 mm to 290 mm, with cross-sections of 1.0, 1.5, 1.78, 2.62, 3.53, 5.33, and 7.00 mm. Dimensional tolerance is ±0.10 to ±0.30 mm, depending on the cross-section. Surface finish is Ra ≤0.8 μm. We follow ISO 3601-1 standards and offer two accuracy grades: Grade A for general applications, and Grade B for aviation use. All rings are free from mold lines, bubbles, or contamination.

We offer four rubber materials:

• Silicone: -50°C to 200°C
• Nitrile: -40°C to 120°C
• Fluorosilicone: -50°C to 260°C
• EPDM: -50°C to 150°C

For oil resistance, nitrile rubber shows a volume change below 10% after 70 hours in ASTM #1 oil at 100°C. For flame resistance, fluorosilicone meets UL94 V-0, meaning it stops burning when the flame is removed.

Compression set is a key measure of seal longevity. High-Quality O-Rings are tested under ASTM D395 Method B, holding the test temperature for 22 hours. Nitrile rubber maintains a compression set below 20%, while fluorosilicone stays below 25%, ensuring sustained sealing force. We also perform air tightness tests at 1.5 times the working pressure for 60 seconds, with zero pressure drop, meeting ISO 13857 leakage standards.

Ideal for hydraulic cylinder seals, flange connections, pipe fittings, valve cores, and aerospace fuel line seals. Our company has 55 employees, including 11 management and technical staff, nine with senior or intermediate technical titles, and a dedicated R&D team. We can help select the right rubber material for special requirements.

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