API Ring Joint Type Gasket – precision-engineered sealing solutions for high-pressure, high-temperature oilfield and industrial applications. Manufactured to API 6A and ASME B16.20 specifications, our RTJ gaskets are available in oval, octagonal, BX, RX, SRX, and SBX styles to suit every flange design and pressure requirement. As a leading China API ring joint gasket manufacturer, Kaxite holds an API license (Level 4 quality rating) and supplies a wide range of materials including low carbon steel, 304/316 stainless steel, and corrosion‑resistant alloys. With large stock sizes from R11 to R105 and fast global delivery, we ensure reliable sealing for critical upstream, midstream, and subsea operations.
An API Ring Joint Gasket (RTJ) is a solid metal sealing component designed for use in specially grooved flanges. It seals by initial line contact, where compressive forces deform the metal slightly to create a leak‑tight joint. These gaskets are essential in high‑pressure and high‑temperature applications, particularly in the oil and gas industry, where they ensure reliable sealing for wellheads, Christmas trees, pipelines, and subsea equipment. Kaxite manufactures RTJ gaskets in strict accordance with API 6A and ASME B16.20, offering oval and octagonal cross‑sections (Styles 800/810) for pressures up to 10,000 psi, and BX (Style 820) and RX (Style 830) designs for up to 15,000 psi – with SRX and SBX vented versions for subsea use.
As an API‑licensed supplier with a Level 4 quality rating, Kaxite guarantees material integrity and dimensional accuracy. We stock a wide inventory of standard sizes (R11–R105) in low carbon steel, 304 SS, 316 SS, and other alloys, and we offer custom machining for non‑standard dimensions. Our China-based manufacturing combines cost‑efficiency with rigorous quality control, ensuring you receive gaskets that meet the most demanding field requirements.
Traditional oval cross‑section, compatible with older round‑bottom grooves. Reliable for moderate pressures.
Superior sealing efficiency compared to oval; fits both flat‑bottom and round‑bottom grooves. Preferred for most API flanges.
Square cross‑section with tapered corners; designed for API 6BX flanges, pressures up to 15,000 psi. Stock in 304/316 SS and low‑carbon steel.
Pressure‑energized octagonal shape, interchangeable with standard octagonal rings; used in API 6B flanges up to 15,000 psi.
Vented versions of RX/BX per API 17D; cross‑drilled to prevent pressure lock during underwater make‑up. Corrosion‑resistant alloys.
| Property / Style | Oval / Octagonal | BX | RX | SRX / SBX |
|---|---|---|---|---|
| Applicable Standard | ASME B16.20 / API 6A | API 6BX | API 6A (6B flanges) | API 17D (subsea) |
| Max. Pressure (psi) | 10,000 | 15,000 | 15,000 | 15,000+ |
| Cross‑section Shape | Oval / Octagonal | Square with tapered corners | Octagonal (pressure‑energized) | Same as BX/RX with vent holes |
| Common Materials | Low Carbon Steel, 304, 316, Alloy 625 | Low Carbon Steel, 304, 316 | Low Carbon Steel, 304, 316 | Corrosion‑resistant alloys |
| Hardness Requirement | Less than flange hardness | Less than flange hardness | Less than flange hardness | Less than flange hardness |
| Stock Sizes Available | R11 – R105 | BX series | RX series | Custom vented sizes |
Kaxite is a proud API‑licensed manufacturer (Level 4 quality rating), certified to produce ring joint gaskets in full compliance with API 6A and ASME B16.20. Our quality management system is ISO 9001:2015 certified, and we implement strict traceability from raw material to finished product:
Case Example: Offshore Production Platform Wellhead Sealing
A North Sea operator required reliable sealing for 15,000 psi wellhead connections. Kaxite supplied BX ring joint gaskets in 316 stainless steel for 7-1/16" 15,000 psi flanges. The gaskets were delivered with full material certification and PMI reports. After installation, they withstood multiple pressure cycles and temperature variations without any leakage, contributing to a 25% reduction in maintenance interventions over the first year. The operator now sources all RTJ gaskets from Kaxite as a preferred China RTJ gasket supplier.
Explore our complete range of ring joint gaskets, including oval, octagonal, BX, and RX styles.
As a leading China API ring joint gasket manufacturer, Kaxite offers distinct advantages for your procurement needs:
To order API ring joint gaskets wholesale, please specify:
Need custom sizes or special materials? Send your inquiry and our engineering team will respond within 24 hours with a tailored quote.
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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
