China Manufacturer of API 6A Ring Joint gaskets SS316 BX gasket
API Ring Joint gaskets are available in octagonal or oval cross-section. Our API Ring Joint Gaskets are used in applications up to 10,000 psi. Where new flanges are to be used, we recommend the higher efficiency octagonal cross-section gaskets. Oval cross-section gaskets are still a very effective gasket solution where the application requires sealing on existing flanges with round bottom grooves.
About BX ring-joint gasket
The Type BX ring-joint gasket is manufactured with a diameter slightly larger than that of the mating ring grooves, which allows radial interference to exist. The OD sealing angle of Type BX ring gaskets is considered to be the primary seal since both radial and axial loads are applied to the OD sealing angles causing the sealing force on the OD sealing angles to be substantially greater than the sealing force on the ID sealing angles. Type BX ring-joint gaskets are designed to be pressure-energized, and do allow face-to-face contact of the flanges or hubs. Axial through-holes are drilled in each BX ring-joint gasket to ensure pressue equalization between each face of the ring-joint gasket and the mating ring grooves.
Dimensions for API ring joint gaskets
Dimensions for API ring joint gaskets and grooves are covered in ANSI B16.20 and API6A.
We stock a wide range of sizes: API Ring Joint Gasket BX Ring Gasket
| API Ring Number | Nominal Flange Bore, Inches | |||
| 5000 psi | 10,000 psi | 15,000 psi | 20,000 psi | |
| BX 150 | 1-11/16 | 1-11/16 | ||
| BX 151 | 1-13/16 | 1-13/16 | 1-13/16 | |
| BX 152 | 2-1/16 | 2-1/16 | 2-1/16 | |
| BX 153 | 2-9/16 | 2-9/16 | 2-9/16 | |
| BX 154 | 3-1/16 | 3-1/16 | 3-1/16 | |
| BX 155 | 4-1/16 | 4-1/16 | 4-1/16 | |
| BX 156 | 7-1/16 | 7-1/16 | 7-1/16 | |
| BX 157 | 9 | 9 | ||
| BX 158 | 11 | 11 | ||
| BX 159 | 13-5/8 | |||
| BX 160 | 13-5/8 | |||
| BX 161 | 16-3/4 | |||
| BX 162 | 16-3/4 | 16-3/4 | ||
| BX 163 | 18-3/4 | |||
| BX 164 | 18-3/4 | |||
| BX 165 | 21-1/4 | |||
| BX 166 | 21-1/4 | |||
| BX 167 | 26-3/4; 2000 & 3000 psi | |||
| BX 168 | ||||
| RTJ standard size gaskets are manufactured in accordance with API-6A and ANSI B16.2 specifications and are furnished in stock materials including soft iron, low carbon steel, 4-6 chrome (F5), 304 & 304L, 316 & 316L, 347, 410, Monel, Inconel and Incoloy. |
Dimensions and Weights of Type BX Ring joint gasket for use with API 6A Type 6BX flanges.
All dimensions are in mm and weights are in kg. The pipe size is the Nominal Pipe Size (NPS).
| Nominal Size (NPS) |
API Class | API 6A (psi) 2000 |
API 6A (psi) 3000 |
API 6A (psi) 5000 |
API 6A (psi) 10000 |
API 6A (psi) 15000 |
API 6A (psi) 20000 |
Ring No. | OD of Ring OD |
Height of Ring H |
Width of Ring A |
Width of Flat C |
OD of Flat OTD |
Hole Size D |
Radius on Ring R1 (min) |
Radius on Ring R1 (max) |
Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1-11/16” | 10000, 15000 | – | – | – | 1-11/16″ | 1-11/16″ | – | BX 150 | 72.19 | 9.3 | 9.3 | 7.98 | 70.87 | 1.6 | 0.13 | ||
| 1-13/16” | 10000, 15000, 20000 | – | – | – | 1-13/16″ | 1-13/16″ | 1-13/16″ | BX 151 | 76.40 | 9.63 | 9.63 | 8.26 | 75.03 | 1.6 | 0.8 | 1.2 | 0.15 |
| 2-1/16” | 10000, 15000, 20000 | – | – | – | 2-1/16″ | 2-1/16″ | 2-1/16″ | BX 152 | 84.68 | 10.24 | 10.24 | 8.79 | 83.24 | 1.6 | 0.8 | 1.2 | 0.19 |
| 2-9/16” | 10000, 15000, 20000 | – | – | – | 2-9/16″ | 2-9/16″ | 2-9/16″ | BX 153 | 100.94 | 11.38 | 11.38 | 9.78 | 99.31 | 1.6 | 0.9 | 1.4 | 0.29 |
| 3-1/16” | 10000, 15000, 20000 | – | – | – | 3-1/16″ | 3-1/16″ | 3-1/16″ | BX 154 | 116.84 | 12.40 | 12.40 | 10.64 | 115.09 | 1.6 | 1.0 | 1.5 | 0.40 |
| 4-1/16” | 10000, 15000, 20000 | – | – | – | 4-1/16″ | 4-1/16″ | 4-1/16″ | BX 155 | 147.96 | 14.22 | 14.22 | 12.22 | 145.95 | 1.6 | 1.1 | 1.7 | 0.56 |
| 7-1/16” | 10000, 15000, 20000 | – | – | – | 7-1/16″ | 7-1/16″ | 7-1/16″ | BX 156 | 237.92 | 18.62 | 18.62 | 15.98 | 235.28 | 3.2 | 1.5 | 2.2 | 1.88 |
| 9” | 10000, 15000 | – | – | – | 9″ | 9″ | 9″ | BX 157 | 294.46 | 20.98 | 20.98 | 18.01 | 291.49 | 3.2 | 1.7 | 2.5 | 2.98 |
| 11” | 10000, 15000 | – | – | – | 11″ | 11″ | 11″ | BX 158 | 352.04 | 23.14 | 23.14 | 19.86 | 348.77 | 3.2 | 1.9 | 2.8 | 4.36 |
| 13-5/8” | 10000 | – | – | – | 13-5/8″ | 13-5/8″ | 13-5/8″ | BX 159 | 426.72 | 25.70 | 25.70 | 22.07 | 423.09 | 3.2 | 2.1 | 3.1 | 6.55 |
| 13-5/8” | 5000 | – | – | 13-5/8″ | – | – | – | BX 160 | 402.59 | 23.83 | 13.74 | 10.36 | 399.21 | 3.2 | 1.9 | 2.9 | 3.07 |
| 16-5/8” | 5000 | – | – | 16-3/4″ | – | – | – | BX 161 | 491.41 | 28.07 | 16.21 | 12.24 | 487.45 | 3.2 | 2.2 | 3.4 | 5.35 |
| 16-5/8” | 5000, 10000 | – | – | 16-3/4″ | 16-3/4″ | – | – | BX 162 | 475.49 | 14.22 | 14.22 | 12.22 | 473.48 | 1.6 | 1.1 | 1.7 | 1.99 |
| 18-¾” | 5000 | – | – | 18-3/4″ | – | – | – | BX 163 | 556.16 | 30.10 | 17.37 | 13.11 | 551.89 | 3.2 | 2.4 | 3.6 | 6.53 |
| 18-¾” | 100000 | – | – | – | 18-3/4″ | 18-3/4″ | – | BX 164 | 570.56 | 30.10 | 24.59 | 20.32 | 566.29 | 3.2 | 2.4 | 3.6 | 9.55 |
| 21-¼” | 5000 | – | – | 21-1/4″ | – | – | – | BX 165 | 624.71 | 32.03 | 18.49 | 13.97 | 620.19 | 3.2 | 2.6 | 3.8 | 8.76 |
| 21-¼” | 10000 | – | – | – | 21-1/4″ | – | – | BX 166 | 640.03 | 32.03 | 26.14 | 21.62 | 635.51 | 3.2 | 2.6 | 3.8 | 12.82 |
| 26-¾” | 2000 | 26-3/4″ | – | – | – | – | – | BX 167 | 759.36 | 35.87 | 13.11 | 8.03 | 754.28 | 1.6 | 2.9 | 4.3 | 8.53 |
| 26-¾” | 3000 | – | 26-3/4″ | – | – | – | – | BX 168 | 765.25 | 35.87 | 16.05 | 10.97 | 760.17 | 1.6 | 2.9 | 4.3 | 11.14 |
| 5-1/8” | 10000 | – | – | – | 5-1/8″ | – | – | BX 169 | 173.51 | 15.85 | 12.93 | 10.69 | 171.27 | 1.6 | 1.3 | 1.9 | 0.73 |
| 6-5/8” | 10000, 15000 | – | – | – | 6-5/8″ | 6-5/8″ | – | BX 170 | 218.03 | 14.22 | 14.22 | 12.22 | 216.03 | 1.6 | 1.1 | 1.7 | 1.03 |
| 8-9/16” | 10000, 15000 | – | – | – | 8-9/16″ | 8-9/16″ | – | BX 171 | 267.44 | 14.22 | 14.22 | 12.22 | 265.43 | 1.6 | 1.1 | 1.7 | 1.24 |
| 11-5/32” | 10000, 15000 | – | – | – | 11-5/32″ | 11-5/32″ | – | BX 172 | 333.07 | 14.22 | 14.22 | 12.22 | 331.06 | 1.6 | 1.1 | 1.7 | 1.56 |
| 30” | 2000, 3000 | 30″ | 30″ | – | – | – | – | BX 303 | 852.75 | 37.95 | 16.97 | 11.61 | 847.37 | 1.6 | 3.0 | 4.6 | – |
Tolerances
Outside Diameter: +0mm, -0.15mm
Height of Ring (H): +0.20mm, -0mm
Width of Ring (A): +0.20mm, -0mm
Width of Flat (C): +0.15mm, -0mm
OD of Flat (OTD): +0.50mm, -0.50mm
Hole Size (D): +0.50mm, -0.50mm
Radius on Ring (R1): +0.50mm, -0.50mm
API BX SS316 Gasket
SS316L Chemical Composition (%)
| UNS | Grade | C ≤ | SI ≤ | MN | P | S | NI | CR | Mo |
| UNS S31600 | 316L | 0.03 | 1 | 2 | 0.045 | 0.03 | 10 to 14 | 16 to 18 | 2.0 – 3.0 |
SS316L Ring joint gasket hardness requirement
| Material | Designation | Maximum Hardness Rockwell B | Maximum Hardness Brinell |
| 316 Stainless Steel | S316 | 83 | 160 |
RTJ Ring Joint Gaskets as per API 6A and ASME B16.5-SS 316 order specification：
- Material: SS316
- Size: 13-5/8″
- Class#: 10000
- Shape: Octagonal
- Ring Number: BX159 RTJ
BX , RTJ Ring Joint Gaskets as per API 6A and ASME B16.5-SS 316 , Style BX are pressure energized gaskets manufactured in accordance with API 6A and designed for use up to 20,000 psi. All BX gaskets incorporate a pressure balance hole to ensure equalization of pressure which may be trapped in the grooves.
