API 6 A6BX and 6B Flanges

Api 6A 6BX and  API 6A 6B Flanges (welding neck flanges, blind flanges, target flanges and test flanges) are fully conformed to API 6A and made of modern alloy steel via advanced manufacturing techniques. They are robust and high cost performance.

API 6 A 6B flanges are of the ring joint type and are not designed for face-to-face make-up. The connection make-up bolting force reacts on the metallic ring gasket

API 6A 6BX flanges are of the ring joint type and designed with a raised face. Depending on the tolerances, the connection make-up bolting force may react on the raised face of the flange when the gasket has been properly seated. This support prevents damage to the flange or gasket from excessive bolt torque.

 

API 6A Flange

API 6A 6BX Welding Neck Flanges

API 6A Type 6BX 15000PSI Blind / API 6A Welding Neck Flange

API Flanges Dimension

Dimension of 15000PSI(103.5MPA) type 6BX Blind and API 6A Welding Neck Flange

Size B OD C E1 Q G K T J1 J2 J3 J4 R BC N H Ring Number
1 13/16″ 46.8 210 3 5.56 77.77 106 45.3 97.6 71.4 47.6 10 160.3 8 26 151
2 1/16″ 53.2 220 3 5.95 86.23 114 50.8 111.1 82.5 54 10 174.6 8 26 152
2 9/16″ 65.9 255 3 6.75 102.77 133 57.2 128.6 100 57.1 10 200 8 29 153
3 1/16″ 78.6 290 3 7.54 119 154 64.3 154 122.2 63.5 10 230.2 8 32 154
4 1/16″ 104 360 3 8.33 150.62 194 78.6 195.3 158.7 73 10 290.5 8 39 155
5 1/8″ 131 420 3 9.5 9.53 176.66 225 98.5 244.5 200 81.8 6.4 16 342.9 12 42 169
7 1/16″ 180.2 505 6 11.1 11.11 241.83 305 119.1 325.4 276.2 92.1 7.9 16 428.6 16 42 156
9 “ 229.4 650 6 12.7 12.7 299.06 381 146.1 431.8 349.2 123.8 14.2 16 552.4 16 51 157
11″ 280.2 815 6 14.3 14.29 357.23 454 187.4 584.2 427 235.7 12.7 16 711.2 20 54 158
13 5/8″ 346.9 885 6 15.9 15.88 432.64 541 204.8 595.3 528.6 114.3 17.5 25 771.5 20 61 159
18 3/4″ 477 1160 6 18.3 18.26 577.9 722 255.6 812.8 730.2 155.6 35.1 25 1016 20 80 164

1. RING NUMBER BX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH

API 6A-TYPE-6BX 103.5 MPA (15000 PSI) FLANGE

API 6A 6B weld neck flanges conforming to Table 36, Table 37 and Table 38 of API 6A (19th Edition) are available.

API 6A Type 6B 2000PSI Blind / Welding Neck Flange

API Flanges Dimension

Dimension of 2000PSI (13.8MPA) type 6B Blind and Welding Neck API 6A Flange

Size B OD C K P E T Q X BC N H LN HL JL R/RX
2 1/16″ 53.2 165 3 108 82.55 7.9 33.4 25.4 84 127 8 20 81 60.3 53.3 23
2 9/16″ 65.9 190 3 127 101.6 7.9 36.6 28.6 100 149.2 8 23 88 73 63.5 26
3 1/8″ 81.8 210 3 146 123.83 7.9 39.7 31.8 117 168.3 8 23 91 88.9 78.7 31
4 1/16″ 108.7 275 3 175 149.23 7.9 46.1 38.1 152 215.9 8 26 110 114.3 103.1 37
5 1/8″ 131 330 3 210 180.98 7.9 52.4 44.5 189 266.7 8 29 122 141.3 122.9 41
7 1/16″ 181.8 355 6 241 211.15 7.9 55.6 47.6 222 292.1 12 29 126 168.3 147.1 45
9″ 229.4 420 6 302 269.88 7.9 63.5 55.6 273 349.3 12 32 141 219.1 199.1 49
11″ 280.2 510 6 356 323.85 7.9 71.5 63.5 343 431.8 16 35 160 273 248.4 53
13 5/8″ 346.9 560 6 413 381 7.9 74.7 66.7 400 489 20 35 57
16 3/4″ 426.2 685 6 508 469.9 7.9 84.2 76.2 495 603.2 20 42 65
21 1/4″ 540.5 815 6 635 584.2 9.7 98.5 88.9 610 723.9 24 45 73

1. RING NUMBER R or RX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH

API 6A Type 6BX 2000PSI Blind Flange

API Blind and Weld Neck Flanges Dimension

Dimension of 2000PSI (13.8MPA) type 6BX Blind API 6A Flange
Size OD C E1 G K T J1 J4 R BC N H BX
26 3/4″ 1040 6 21.4 768.33 805 126.3 835.8 9.7 16 952.5 20 48 167
30″ 1120 6 23 862.3 908 134.2 931.9 17.5 16 1039.8 32 45 303
API 6A Type 6B 3000PSI Blind / Welding Neck Flange

API Flanges Dimension

Dimension of 3000PSI (20.7MPA) Type 6B Blind and API 6A Welding Neck Flange
Size B OD C K P E T Q X BC N H LN HL JL R/RX
2 1/16″ 53.2 215 3 124 95.25 7.9 46.1 38.1 104.8 165.1 8 26 109.6 60.3 50 24
2 9/16″ 65.9 245 3 137 107.95 7.9 49.3 41.3 123.8 190.5 8 29 112.7 73 59.7 27
3 1/8″ 81.8 240 3 156 123.83 7.9 46.1 38.1 127 190.5 8 26 109.5 88.9 74.4 31
4 1/16″ 108.7 290 3 181 149.23 7.9 52.4 44.4 158.8 235 8 32 122.2 114.3 98 37
5 1/8″ 131 350 3 216 180.98 7.9 58.8 50.8 190.5 279.4 8 35 134.9 141.3 122.9 41
7 1/16″ 181.8 380 6 241 211.15 7.9 63.5 55.6 235 317.5 12 32 147.6 168.3 147.1 45
9″ 229.4 470 6 308 269.88 7.9 71.5 63.5 298.5 393.7 12 39 169.9 219.1 189.7 49
11″ 280.2 545 6 362 323.85 7.9 77.8 69.9 368.3 469.9 16 39 192.1 273 237.2 53
13 5/8″ 346.9 610 6 419 381 7.9 87.4 79.4 419.1 533.4 20 39 57
16 3/4″ 426.2 705 6 524 469.9 11.2 100.1 88.9 508 616 20 45 66
20 3/4″ 527.8 855 6 648 584.2 12.7 120.7 108 622.3 749.3 20 54 74

1. RING NUMBER R or RX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH

API 6A Type 6B 5000PSI Blind / Welding Neck Flange

API Flanges Dimension

Dimension of 5000PSI (34.5MPA) type 6B Blind and API 6A Welding Neck Flange
Size B OD C K P E T Q X BC N H LN HL JL R/RX
2 1/16″ 53.2 215 3 124 95.25 7.9 46.1 38.1 104.8 165.1 8 26 109.5 60.3 43.7 24
2 9/16″ 65.9 245 3 137 107.95 7.9 49.3 41.3 123.8 190.5 8 29 112.7 73 54.9 27
3 1/8″ 81.8 265 3 168 136.53 7.9 55.6 47.7 133.3 203.2 8 32 125.4 88.9 67.5 35
4 1/16″ 108.7 310 3 194 161.93 7.9 62 54 161.9 241.3 8 35 131.8 114.3 88.1 39
5 1/8″ 131 375 3 229 193.68 7.9 81 73.1 196.8 292.1 8 42 163.5 141.3 110.3 44
7 1/16″ 181.8 395 6 248 211.15 9.7 92.1 82.6 228.6 317.5 12 39 181 168.3 132.6 46
9″ 229.4 485 6 318 269.88 11.2 103.2 92.1 292.1 393.7 12 45 223.8 219.1 173.8 50
11″ 280.2 585 6 371 323.85 11.2 119.1 108 368.3 482.6 12 51 265.1 273.1 216.7 54

1. RING NUMBER R or RX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH

API 6A Type 6BX 10000PSI Blind / Welding Neck Flange

API Flanges Dimension

Dimension of 10000PSI(69.0MPA) type 6BX Blind and API 6A Welding Neck Flange
Size B OD C E1 Q G K T J1 J2 J3 J4 R BC N H BX
1 13/16″ 46.8 185 3 5.56 77.77 105 42.1 88.9 65.1 48.5 10 146.1 8 23 151
2 1/16″ 53.2 200 3 5.95 86.23 111 44.1 100 74.7 51.6 10 158.8 8 23 152
2 9/16″ 65.9 230 3 6.75 102.77 132 51.2 120.7 92.1 57.2 10 184.2 8 26 153
3 1/16″ 78.6 270 3 7.54 119 152 58.4 142.1 110.2 63.5 10 215.9 8 29 154
4 1/16″ 104 315 3 8.33 150.62 185 70.3 182.6 146.1 73.1 10 258.8 8 32 155
5 1/8″ 131 360 3 9.5 9.53 176.66 221 79.4 223.8 182.6 81 6.4 10 300 12 32 169
7 1/16″ 180.2 480 6 11.1 11.11 241.83 302 103.2 301.6 254 95.3 9.7 16 403.2 12 42 156
9 “ 229.4 550 6 12.7 12.7 299.06 359 123.9 374.7 327.1 93.7 9.7 16 476.3 16 42 157
11″ 280.2 655 6 14.3 14.29 357.23 429 141.3 450.9 400.1 103.2 14.2 16 565.2 16 48 158
13 5/8″ 346.9 770 6 15.9 15.88 432.64 518 168.3 552.5 495.3 114.3 17.5 16 673.1 20 51 159
16 3/4″ 426.2 870 6 8.3 8.33 478.33 576 168.3 655.6 601.7 76.2 30.2 19 776.3 24 51 162
18 3/4″ 477 1040 6 18.3 18.26 577.9 697 223.1 752.5 674.7 155.6 25.4 16 925.5 24 61 164
21 1/4″ 540.5 1145 6 19.1 19.05 647.88 781 241.3 847.7 762 165.1 31.8 21 1022.4 24 67 166

1. RING NUMBER BX, 2. C should be the max value 3. Tolerance and Ring Gasket according to API 6A-20TH

API 6A 6BX weld neck flanges conforming to Table 42 or Table 43 of API 6A (19th Edition) are available.

API 6A Type 6BX 15000PSI Blind / API 6A Welding Neck Flange
API 6A welding neck flanges
6B welding neck flange 6BX welding neck flange

API 6A 6BX and API 6A 6B Blind Flanges

API 6A 6B blind flanges conforming to Table 36, Table 37 and Table 38 of API 6A (19th Edition) are available.

API 6A 6BX blind flanges conforming to Table 46 of API 6A (19th Edition) are available

API 6A 6BX blind flanges
API 6 A 6B blind flange 6BX blind flange 6BX blind flange with fluid cushion counterbore

 

API 6A 6BX Target Flanges, Lead Filled

Target Flange: a special configuration of blind flange used downstream, facing upstream, to cushion and reduce the erosive affect of high velocity abrasive fluid. This flange has a counter bore filled with lead as illustrated below.

Target Flanges conforming to Table 44 and Table 45 of API 6A are available.

API 6A 6BX target flanges

API 6A 6BX and 6B Test Flanges

API 6A 6B test flanges conforming to Table 36, Table 37 and Table 38 of API 6A (19th Edition) are available.

API 6A 6BX test flanges conforming to Table 44 and Table 45 of API 6A are available.

 

API 6A 6B test flanges API 6A 6BX test flanges
6B test flange 6BX test flange

 

The difference between ASME/ANSI and API is the fabrication material and a higher rated API operating pressure.

ASME/ANSI flanges are commonly used in industrial process systems handling water, steam, air and gas. API flanges are manufactured for high strength operating refinery systems with products such as oil and explosive gases.

The flange standards API 6A and ASME/ANSI B16.5 have the same dimensions – but the API 6A flanges are rated for higher pressures as indicated below:

API vs. ASME/ANSI Flanges with the same Dimensions
Flange Pressure Class Rating 
(psi)

Nominal Size Range
(inches)
ASME/ANSI B16.5 API 6A ASME/ANSI B16.5 API 6A1)
Weld neck 600 2000 1/2 – 24 113/16 – 11
900 3000
1500 5000
Blind and Threaded 600 2000 113/16 – 211/4
900 3000 113/16 – 203/4
1500 5000 113/16 – 11

1) In the old API standard, flanges ranged from 1 1/2 to 10(20) inches.

  • 1 inch = 25.4 mm

 

API 6A 6BX Welding Neck RTJ Flanges

API 6A 6BX Flange

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