BX Ring Joint Gasket
Product Description
Product Detail
BX Ring Joint Gasket – Pressure-Energized Metal Seal for 6BX Flanges, 5,000 to 20,000 psi Service | Model KXT 830
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BX Ring Joint Gasket (Model KXT 830) is a metal sealing ring with a BX-shaped cross-section, machined to fit only 6BX flanges. It is a radial pressure-energized seal — one specific variant of the octagonal metal ring gasket family. The gasket makes contact with both the inner and outer ring joint faces, and as the connection bolts are tightened the sealing surfaces are pressed tightly together to establish the initial seal. When internal media pressure rises, the BX ring joint gasket expands radially under pressure and presses even more tightly against the bevel face of the ring joint groove, forming a self-tightening effect. This makes BX rings the correct choice for high-pressure wellhead, Christmas tree and manifold connections in the 5,000 psi to 20,000 psi range.
Model: KXT 830 |
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KNOW YOUR RING JOINT GASKET
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How the BX Ring Joint Gasket Seals – Radial Pressure Energizing
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STEP 1 · BEFORE PRESSURIZATION
Bolt load creates initial seal
As the flange bolts are tightened, the BX ring is compressed in the axial direction. Its upper and lower surfaces contact the ring joint grooves and deform plastically to make the initial seal line. |
STEP 2 · AFTER PRESSURIZATION
Media pressure reinforces the seal
As internal pressure rises, the BX ring expands radially outward and presses harder against the bevel face of the ring joint groove — the seal actually tightens as pressure increases. This is why BX is described as a radial pressure-energized gasket. |
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IMPORTANT LIMIT
Rising media pressure deforms the flange and the connecting bolts, which can cause the sealing surfaces to separate slightly and reduce the sealing ratio. Because the plastic deformation of the BX ring cannot be reversed, BX ring joint gaskets must not be reused after the joint has been opened. |
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Available Materials and Hardness
When the octagonal type is chosen, the material hardness of the gasket should be 15 to 20 HB lower than the hardness of the flange face. The table below lists the standard metals, their maximum hardness and their usable temperature range for the BX Ring Joint Gasket.
| Material | Max HB | Max HRB | Temp °C | Mark |
| Soft Iron | 90 | 56 | -60 to 500 | D |
| Low Carbon Steel | 120 | 68 | -40 to 540 | S |
| 304 SS | 160 | 83 | -250 to 540 | 304 |
| 304L SS | 160 | 83 | -250 to 540 | 304L |
| 316 SS | 160 | 83 | -200 to 815 | 316 |
| 316L SS | 160 | 83 | -200 to 815 | 316L |
| 321 SS | 160 | 83 | -200 to 870 | 321 |
| 347 SS | 160 | 83 | -200 to 870 | 347 |
| 410 SS | 170 | 86 | -40 to 850 | 410 |
| 5Cr-0.5Mo | 130 | — | -29 to 650 | — |
| Copper | 80 | — | -100 to 315 | — |
| Aluminum | 35 | — | -200 to 425 | — |
| Inconel 600 | 150 | — | -100 to 1095 | — |
| Incoloy 825 | 150 | — | -100 to 1095 | — |
| Monel 400 | 150 | — | -100 to 760 | — |
| Titanium | 215 | — | -200 to 540 | — |
| Nickel 200 | 110 | — | -200 to 760 | — |
| Hastelloy B2 | 230 | — | -100 to 1095 | — |
| Hastelloy C276 | 210 | — | -100 to 1095 | — |
BX Ring Joint Gasket Drawing
The BX ring has a distinctive BX-shaped cross-section that fits into the 6BX ring joint groove. The drawing below shows the profile and the key dimensions that must match the 6BX flange standard.
Applicable Standards
| ANSI B16.5-1973 Pipe flanges and flanged fittings | JPI-75-15-70 Ring joint gaskets for oil refinery service | HG20633-97 Steel pipe flange ring joint gaskets |
| GB 699 · GB 1220 · JB 755 Chinese national and ministerial standards for carbon steel, stainless steel and pressure vessel steel materials | ||
Where BX Ring Joint Gaskets Are Used
| Wellhead & Christmas Trees High-pressure wellhead and production tree connections rated 5,000 – 20,000 psi, where BX ring joint gaskets are the standard sealing element. | Manifolds & Chokes Production manifolds, choke manifolds and high-pressure flow lines that use 6BX flanges throughout the connection. |
| High-Pressure Pipelines Refinery and petrochemical process piping where the 6BX flange pattern is specified for pressure containment. | Subsea Equipment Subsea wellhead, tree and manifold connections where the metal-to-metal seal must withstand extreme pressure and long-term exposure. |
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Get Your BX Ring Joint Gasket Quotation
Tell us the 6BX flange size, pressure rating, material grade and quantity — we reply within 24 hours with FOB pricing, lead time and a free sample offer.
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Frequently Asked Questions
Related ring joint gaskets: Oval Ring Joint Gasket, Octagonal Ring Joint Gasket, RX Ring Joint Gasket and Lens Ring Joint Gasket.