Octagonal Ring Joint Gasket – precision-engineered metal sealing rings with an octagonal cross-section, designed for high-pressure API and ASME flange connections. Featuring superior sealing efficiency compared to oval types, these gaskets are fully interchangeable with standard oval ring joint gaskets in modern flat-bottom grooves. As a leading China octagonal ring joint gasket manufacturer, Kaxite supplies these gaskets in a comprehensive range of materials – from soft iron and carbon steel to stainless steels (304/316/347/410) and exotic alloys (Inconel, Incoloy, Monel, Hastelloy) – meeting ASME B16.20, API 6A, and other international standards.
An octagonal ring joint gasket is a solid metal sealing ring with a flat-topped octagonal cross-section. It is designed to seal flanged connections by line contact between the gasket and the flange groove under compressive load. Compared to oval ring gaskets, the octagonal design offers higher sealing efficiency due to its larger contact area, making it the preferred choice for most modern API and ASME flanged connections.
Octagonal ring gaskets are manufactured to ASME B16.20 and API 6A specifications, ensuring precise fit and consistent performance. They are fully interchangeable with oval gaskets in flat-bottom grooves, offering an upgrade path for existing installations without flange modification. As a premier China RTJ gasket manufacturer, Kaxite produces octagonal gaskets in sizes from R11 to R105, with materials selected to match your operating temperature, pressure, and media requirements.
Octagonal cross-section – Style 810
Oval (Style 800)
Octagonal (Style 810) ★
| Material | Hardness (HB) | Temp Range (°C) | Typical Service |
|---|---|---|---|
| Soft Iron | 90 | -60 to 500 | General oilfield, moderate temperatures |
| Low Carbon Steel | 120 | -40 to 540 | High-temperature service, refineries |
| SS304 / 304L | 160 | -250 to 540 | Cryogenic to moderate high-temp, general corrosion |
| SS316 / 316L | 160 | -200 to 815 | Superior corrosion resistance, chemical plants |
| SS321 / 347 | 160 | -200 to 870 | High-temp, sensitization resistance |
| SS410 | 170 | -200 to 850 | Wear resistance, valve applications |
| Inconel 600/625 | 150 | -100 to 1095 | Severe corrosion, high-temp, aerospace |
| Incoloy 800/825 | 150 | -100 to 1095 | Corrosive environments, acid service |
| Monel 400 | 150 | -100 to 1095 | Seawater, marine, chemical processing |
Additional materials: Hastelloy B2/C276, Titanium, Zirconium, Copper, and Duplex grades available upon request.
Case Example: Pipeline Compressor Station Upgrade
A natural gas pipeline compressor station in Texas was experiencing chronic leakage at 600# flange connections using oval ring gaskets. Kaxite recommended and supplied octagonal ring joint gaskets in low carbon steel for the 10" 600# flanges. The octagonal design provided superior contact pressure and sealing efficiency, eliminating leaks. After 24 months of service, zero leak events were reported, and the station adopted octagonal gaskets as their standard for all future maintenance.
For other ring joint gasket types, explore our Oval, API Ring Joint, BX, RX, and Lens gaskets.
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Need custom dimensions or specialty alloys? Send your inquiry and our engineering team will respond within 24 hours.
★ China's Leading Octagonal Ring Joint Gasket Manufacturer – Request Your Quote
Contact Kaxite for factory-direct pricing, custom alloys, and expert technical support.
Address
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
