Octagonal Ring Joint Gasket
Model:KXT 810
> Octagonal Ring Joint Gasket are for oilfield and process industry duties. > Octagonal shape gasket is belong to API 6A R series > These gaskets are used in pressures up to 10,000 PSI, more than Oval ring joint. > The oval type is the only gasket that will fit a bottom radiused groove. > Gaskets and not re-used after torque.
Octagonal Ring Joint Gasket – KXT 810 for High-Pressure Oil & Gas Applications
Kaxite Sealing, a leading China octagonal ring joint gasket manufacturer, introduces the KXT 810 Octagonal Ring Joint Gasket – a critical sealing component engineered for high-pressure oilfield and process industry duties. As a key part of the API 6A R series, our octagonal RTJ gaskets are designed to provide a reliable, leak-tight seal in extreme environments, handling pressures up to 10,000 PSI. Precision-machined from high-grade materials, these gaskets are the preferred choice for critical wellhead, valve, and pipeline connections where safety and performance are non-negotiable.
Why KXT 810? Unlike oval ring joint gaskets, the octagonal design is the only style that perfectly fits a bottom radiused groove, ensuring superior metal-to-metal sealing contact. This design maximizes the sealing surface area, providing a more robust barrier against blowouts and fugitive emissions. While oval gaskets can be used in standard RTJ flanges, the octagonal type is specifically mandated for high-pressure and high-temperature applications to ensure the integrity of the seal under severe service conditions. Compliant with ANSI B16.5, JPI-75-15-70, and GB standards, our KXT 810 gaskets offer unmatched reliability.
As a trusted ring joint gasket supplier in China, Kaxite offers the KXT 810 in a comprehensive range of materials – from Soft Iron and Low Carbon Steel to Stainless Steel (304/316), Inconel, Monel, and Titanium. We also provide custom machining services to meet non-standard flange requirements. Whether you need bulk gaskets for maintenance stock or certified gaskets for critical API 6A applications, we ensure full material traceability and rigorous quality control. Request a free sample or get a wholesale quote today.
Pressure RatingUp to 10,000 PSI
TypeAPI 6A R Series
ShapeOctagonal
StandardsANSI B16.5 / ASME
Material Hardness15-20 HB lower than flange
ReusabilityNot recommended (single use)
Why KXT 810 Octagonal Ring Joint Gasket?
- ✅ Superior High-Pressure Sealing – Rated for up to 10,000 PSI, ideal for wellhead and pipeline applications
- ✅ Designed for API 6A R Series – Fully compliant with international oil & gas standards
- ✅ Octagonal Cross-Section – Provides tighter sealing compared to oval types in bottom radiused grooves
- ✅ Wide Material Selection – Available in SS316, Inconel, Monel, Titanium, Soft Iron, and more
- ✅ Custom Manufacturing – We offer OEM sizes and non-standard dimensions
- ✅ Cost-Effective & Reliable – Factory-direct pricing with full material traceability
ISO 9001:2015 API 6A Compliant NACE MR0175 (on request) ASME B16.5 / B16.47 Full Material Traceability
Key Advantages of KXT 810 Octagonal Ring Joint Gasket
Optimized for High Pressure – The octagonal cross-section provides a superior sealing surface against the RTJ flange groove, making it suitable for pressures up to 10,000 PSI and above.
Compatibility with RTJ Flanges – Specifically designed to fit standard ring-type joint flanges per ASME B16.5 and API 6A specifications.
Corrosion and Heat Resistance – Available in exotic alloys (Inconel, Hastelloy, Titanium) for sour gas (H₂S) and high-temperature environments up to 1095°C.
Superior Hardness Control – Manufactured to a hardness 15-20 HB lower than the flange face, preventing galling and ensuring a reliable seal.
Precision Machined – CNC machined to strict tolerances, ensuring accurate dimensions and a perfect fit in the flange groove.
API 6A Certified Options – We supply gaskets with full documentation and certification for critical oilfield and subsea applications.
Material Specifications & Technical Data
The KXT 810 is available in a wide range of materials to match your specific service conditions. We strictly control chemical composition and mechanical properties to ensure compliance with international standards. The following table outlines the available materials, maximum Brinell hardness, temperature ranges, and our standard marking abbreviations.
| Material | Max Hardness (Brinell) | Temperature Range (°C) | Marking |
|---|---|---|---|
| Soft Iron | 90 | -60 ~ 500 | D |
| Low Carbon Steel | 120 | -40 ~ 540 | S |
| 304SS | 160 | -250 ~ 540 | 304 |
| 304LSS | 160 | -250 ~ 540 | 304L |
| 316SS | 160 | -200 ~ 815 | 316 |
| 316LSS | 160 | -200 ~ 815 | 316L |
| 321SS | 160 | -200 ~ 870 | 321 |
| 347SS | 160 | -200 ~ 870 | 347 |
| 410SS | 170 | -40 ~ 850 | 410 |
| 5Cr-0.5Mo | 130 | -29 ~ 650 | F5 |
| Inconel 600 | 150 | -100 ~ 1095 | INC |
| Monel 400 | 150 | -100 ~ 760 | MON |
| Titanium | 215 | -200 ~ 540 | TI |
| Hastelloy C276 | 210 | -100 ~ 1095 | HC |
* Special materials like Duplex, Super Duplex, and custom alloys are available on request. Contact our engineering team for specific requirements.
Octagonal vs Oval RTJ Gaskets – Technical Comparison
| Feature | Octagonal (KXT 810) | Oval |
|---|---|---|
| Pressure Rating | Up to 10,000 PSI (Higher) | Lower (Standard) |
| Groove Compatibility | Fits bottom radiused grooves | Limited compatibility |
| Sealing Efficiency | Superior metal-to-metal seal | Good |
| Reusability | Not recommended (one-time use) | Limited |
| Typical Applications | High-pressure wellheads, valves, pipelines | General industrial flanges |
* The octagonal design is the only type that will fit a bottom radiused RTJ groove and is preferred for critical high-pressure services.
Typical Applications & Industries
Oil & Gas Wellheads Sealing of casing heads, tubing heads, and Christmas trees in high-pressure, sour gas (H₂S) environments.
Pipeline Valves API 6A and ANSI flanged connections for pipeline valves, ball valves, and gate valves in transmission systems.
Subsea & Offshore Critical sealing for subsea trees, manifolds, and blowout preventers (BOPs) where failure is not an option.
Also explore our complete ring joint gasket range for other styles.
Refining & Petrochemical High-temperature, high-pressure flange connections in catalytic cracking, hydrotreating, and distillation units.
Power Generation Sealing of steam lines and turbine connections in conventional and nuclear power plants.
General Process Industry Replacement RTJ gaskets for chemical, pulp and paper, and other high-integrity process applications.
Why Choose Kaxite for Octagonal Ring Joint Gaskets?
Years of Oil & Gas Expertise – With decades of experience in critical sealing applications, Kaxite understands the rigorous demands of the oilfield. Our manufacturing processes are tailored to meet API 6A and ASME standards.
Certified Quality Assurance – Our ISO 9001:2015 certified facility ensures strict material control, precision machining, and dimensional inspection for every gasket we ship.
Full Customization Capability – We supply all R, RX, and BX ring joint gasket types. For KXT 810, we offer any size, any material, and custom marking to match your flange specifications.
Competitive Factory-Direct Pricing – As a China ring joint gasket manufacturer, we eliminate middleman costs, providing you with premium quality at the most competitive prices.
Rapid Quoting & Technical Support – Our engineering team provides fast turnarounds on quotes, technical drawings, and material certifications. We respond to inquiries within 2 business hours.
Global Supply Chain – We ship to over 40 countries, with robust packaging and flexible logistics solutions to meet your project timelines.
Proven in the Field: Kaxite RTJ gaskets are installed in some of the most challenging oil and gas production environments. Our commitment to quality and reliability makes us a preferred supplier to major EPCs and operators worldwide.
Quality Assurance & Regulatory Compliance
Kaxite Sealing is an ISO 9001:2015 certified manufacturer. Our octagonal ring joint gaskets are produced under strict process controls – from raw material selection and forging to CNC machining and final inspection. Each gasket is inspected for dimensional accuracy, surface finish, and hardness to ensure compliance with ASME B16.5 and API 6A standards. We provide material test certificates (MTCs) and hardness test reports with every shipment, ensuring full traceability from raw material to finished product.
- ISO 9001:2015
- API 6A (on request)
- NACE MR0175 / ISO 15156 (on request)
- ASME B16.5 / B16.47
- 100% Hardness & Dimensional Inspection
Certified for critical service – our ring joint gaskets are trusted by oil and gas operators, EPC contractors, and valve manufacturers worldwide.
Custom Engineering & OEM Services – Free Consultation Available
As a professional octagonal ring joint gasket manufacturer in China, we offer complete customisation to meet your project specifications. Request a free consultation or get a bulk quote today:
- Custom sizes for any flange standard (ANSI, ASME, API, BS, DIN)
- Exotic and high-performance alloys
- NACE MR0175 sour service certification
- API 6A certified documentation
- Prototype tooling samples (lead time 3~7 days)
- Production orders (lead time 7-15 days)
Get a free engineering consultation or request a tailored bulk quote – our engineers respond within 24 hours with competitive factory pricing and lead‑time estimates.
Frequently Asked Questions About Octagonal Ring Joint Gaskets
- Q: What is the difference between an octagonal and an oval ring joint gasket?
- A: The octagonal gasket features a flat, octagonal cross-section, while the oval gasket has a rounded oval shape. The octagonal design provides a tighter, more reliable seal and is the only type that fits a bottom radiused RTJ groove. It is typically specified for high-pressure applications up to 10,000 PSI, offering superior metal-to-metal contact compared to the oval design.
- Q: Can I reuse an octagonal ring joint gasket?
- A: We strongly recommend against reusing ring joint gaskets. Once compressed, the metal deforms to create a seal. Reusing a gasket can lead to leakage, failure, and safety hazards. For critical applications, always use a new gasket. We supply KXT 810 gaskets as single-use items to ensure maximum reliability.
- Q: Why is material hardness important for RTJ gaskets?
- A: The gasket material must be softer than the flange face (typically 15-20 HB lower) to prevent galling and ensure a proper seal. A gasket that is too hard will damage the flange groove, while a gasket that is too soft may extrude under high pressure. Our KXT 810 is precisely machined and hardness-tested to meet these critical requirements.
- Q: Is the KXT 810 suitable for sour gas (H₂S) service?
- A: Yes, depending on the material selected. We supply KXT 810 gaskets in NACE MR0175 / ISO 15156 compliant materials such as 316SS, Inconel, and Hastelloy for sour service applications. Please specify your service conditions so we can recommend the optimal material.
- Q: What standards are octagonal ring joint gaskets manufactured to?
- A: We manufacture KXT 810 gaskets to ASME B16.5, API 6A, and BS 1560 standards. We can also manufacture to JPI, DIN, and other international specifications on request. Contact us with your flange details for a custom quote.
Partner with Kaxite Sealing – your trusted octagonal ring joint gasket manufacturer and supplier in China. With decades of oil and gas sealing expertise, advanced machining capabilities, and an unwavering commitment to quality, we deliver RTJ gaskets that perform reliably in the most demanding high-pressure and sour service applications. Request a free consultation or get a tailored bulk quote today – our engineers respond within 24 hours.
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No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
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