BX Ring Gasket Manufacturer | Ring Joint Gasket Supplier – API 6A Type BX
We are a manufacturer of API 6A Type BX Ring gasket.
BX gaskets are pressure-energized metal ring joint gaskets, designed for high-pressure applications—API 6A flanges rated 5,000 to 20,000 PSI. Made typically from soft iron, stainless steel, Inconel, or other high-strength alloys, BX gaskets are used in oilfield wellheads, valves, and pressure-containing equipment.
What is Style BX RTJ Gasket?
The BX type RTJ gaskets are manufactured according to API 6A and are suitable for use in high-pressure API 6BX flanges.
The gaskets form a metal to metal seal on assembly and the efficiency improves as internal pressure increases.
All BX sizes have a pressure relief hole to equalize pressure across sealing faces.
Character of our BX Ring gasket
- All gaskets fully comply with the ASME B16.20 standard and the API spec 6A (where applicable)
- All materials are fully traceable and documentation can be supplied upon request
- Material hardness is carefully controlled which ensures a good seal without damaging the surfaces of the flanges
- RTJ gaskets can withstand aggressive chemicals and temperatures up to 1,000°C (1,832°F) with properly selected metal
- All gaskets have a thin protective coating to eliminate oxidation effects due to atmospheric contact
API 6A/ASME B16.20 BX type Ring Joint Gaskets Dimension and Weight
| RINGNO. | PRESSLURE ALASSES, API 6BX | OUTSIDEDIAMETEROF RINGOD | HELCHTOFRINGH | WIDTHOFRINGA | HOLESIZED | GASKETWELGHT.Ibs.for APL 66x flanges | |||||
| 2000 | 3000 | 5000 | 10000 | 15000 | 20000 | ||||||
| Bx150 | – | – | – | 1 11/16 | 1 11/16 | – | 72.19 | 9.30 | 9.30 | 1.59 | 0.295 |
| Bx151 | – | – | – | 1 13/16 | 1 13/16 | 1 13/16 | 76.40 | 9.63 | 9.63 | 1.59 | 0.337 |
| Bx152 | – | – | – | 2 1/16 | 2 1/16 | 2 1/16 | 84.68 | 10.24 | 10.24 | 1.59 | 0.425 |
| Bx153 | – | – | – | 2 9/16 | 2 9/16 | 2 9/16 | 100.94 | 11.38 | 11.38 | 1.59 | 0.632 |
| Bx154 | – | – | – | 3 1/16 | 3 1/16 | 3 1/16 | 116.84 | 12.40 | 12.40 | 1.59* | 0.875 |
| Bx155 | – | – | – | 4 1/16 | 4 1/16 | 4 1/16 | 147.96 | 14.22 | 14.22 | 1.59 | 1.22 |
| Bx156 | – | – | – | 7 1/16 | 7 1/16 | 7 1/16 | 237.92 | 18.62 | 18.62 | 3.18 | 4.14 |
| Bx157 | – | – | – | 9 | 9 | 9 | 294.46 | 20.98 | 20.98 | 3.18 | 6.55 |
| Bx158 | – | – | – | 11 | 11 | 11 | 352.04 | 23.14 | 23.14 | 3.18 | 9.60 |
| Bx159 | – | – | – | 13 5/8 | 13 5/8 | 13 5/8 | 426.72 | 25.70 | 25.70 | 3.18 | 14.41 |
| Bx160 | – | – | 13 5/8 | – | – | – | 402.59 | 23.83 | 13.74 | 3.18 | 6.75 |
| Bx161 | – | – | 16 3/4 | – | – | – | 491.41 | 28.07 | 16.21 | 3.18 | – |
| Bx162 | – | – | 16 3/4 | 16 3/4 | 16 3/4 | – | 475.49 | 14.22 | 14.22 | 1.59 | – |
| Bx163 | – | – | 18 3/4 | – | – | – | 556.16 | 30.10 | 17.37 | 3.18 | – |
| Bx164 | – | – | – | 18 3/4 | 18 3/4 | – | 570.56 | 30.10 | 24.59 | 3.18 | – |
| Bx165 | – | – | 21 1/4 | – | – | – | 624.71 | 32.03 | 18.49 | 3.18 | – |
| Bx166 | – | – | – | 21 1/4 | – | – | 640.03 | 32.03 | 26.14 | 3.18 | – |
| Bx167 | 26 3／4 | – | – | – | – | – | 759.36 | 35.87 | 13.11 | 1.59 | – |
| Bx168 | – | 26 3／4 | – | – | – | – | 765.25 | 35.87 | 16.05 | 1.59 | – |
| Bx169 | – | – | – | 5 1/8 | – | – | 173.51 | 15.85 | 12.93 | 1.59 | – |
| Bx170 | – | – | – | 6 5/8 | 6 5/8 | – | 218.03 | 14.22 | 14.22 | 1.59 | – |
| Bx171 | – | – | – | 8 9/16 | 8 9/16 | – | 267.44 | 14.22 | 14.22 | 1.59 | – |
| Bx172 | – | – | – | 11 5/32 | 11 5/32 | – | 333.07 | 14.22 | 14.22 | 1.59 | – |
| BX303 | 30 | 30 | – | – | – | – | 852.75 | 37.95 | 16.97 | 1.59 | – |
Tolerance of BX Ring gasket dimension
| TOLERANCES:(mm)A*(width of ring) +0.20,-0.000 A*(hole size) ±0.5 H*(height of ring) +0.20,-0.000 OD(od of ring) +0.000,-0.150 23*(angle) ±1/4° |
NOTE 1: Radius of the ring shall be 8%to12% of the ring height ‘H’.
One pressure passage hole required per ring on centre line *A plus tolerance of 0.008inches for width *A* and height *H* is permitted. provided the variation in width or height does not exceed 0.004 inches throughout its entire circumference
Materials Commonly Used for BX Ring gasket
The material of RTJ gaskets shall match the flanges material but must have a lower hardness: this to ensure that the gasket, and not the flange, get plastically deformed within the groove of the flange as the two mating flanges are bolted together.
In case a harder material for the ring type joint is used, the groove of the flange would be damaged as the flanges are tightened (the hardness values for ring joint gaskets are given below).
| Ring Gasket Material | Maximum Hardness | |
| Brinell | Rockwell “B” Scale | |
| Soft iron | 90 | 56 |
| Low-carbon steel | 120 | 68 |
| 4-6 chrome 1 ⁄ 2 Mo | 130 | 72 |
| Type 410 | 170 | 86 |
| Type 304 | 160 | 83 |
| Type 316 | 160 | 83 |
| Type 347 | 160 | 83 |
Certifications for API 6A BX Ring gasket
- EN 10204 3.1 Mill Test Certificate
- Pressure test report (if required)
- NACE MR0175 / ISO 15156 compliance for sour service
