Threaded Flange
Threaded Flange
A Threaded Flange is a type of flange used in piping systems, characterized by internal threads that allow it to be screwed onto the pipe without the need for welding. This makes it easier to install and remove, particularly when welding may not be feasible or when the pipe cannot be welded due to its material or configuration. Threaded flanges are commonly used in systems that deal with high pressures, as they create a tight seal.
Key Features Threaded Flange
- No Welding Required: The threaded design makes installation fast and convenient, reducing labor costs and complexity.
- Leak-Proof Seal: When properly installed, threaded flanges create a strong, leak-proof seal without the need for additional sealing compounds.
- Corrosion Resistance: Available in various materials, such as stainless steel, carbon steel, and alloy steels, threaded flanges offer durability and corrosion resistance in harsh environments.
- Versatility: These flanges are versatile for various industries and are suitable for small and large-diameter pipes.
Threaded Flange Dimensions
Class 150 Threaded Flange Dimensions
Nominal Outside Dia Thick of Dia of Dia of Length Min Thread Min Counter No of Dia of Dia of Dia of Approx
Pipe Size of Flange Flange Raised Face Hub at Base thru Hub Length Bore Holes Holes Bolts Bolt Circle Weight
(D) (B) (G) (A) (H) (T) (Q) (L) (inch) (K) (kg)
1/2 88.9 11.2 35.1 30.2 15.7 15.7 4 15.7 1/2 60.5 0.5
3/4 98.6 12.7 42.9 38.1 15.7 15.7 4 15.7 1/2 69.9 1
1 108 14.2 50.8 49.3 17.5 17.5 4 15.7 1/2 79.2 1
1-1/4 117.3 15.7 63.5 58.7 20.6 20.6 4 15.7 1/2 88.9 1
1-1/2 127 17.5 73.2 65 22.4 22.4 4 15.7 1/2 98.6 1
2 152.4 19.1 91.9 77.7 25.4 25.4 4 19.1 5/8 120.7 2
2-1/2 177.8 22.4 104.6 90.4 28.4 28.4 4 19.1 5/8 139.7 3
3 190.5 23.9 127 108 30.2 30.2 4 19.1 5/8 152.4 4
3-1/2 215.9 23.9 139.7 122.2 31.8 31.8 8 19.1 5/8 177.8 5
4 228.6 23.9 157.2 134.9 33.3 33.3 8 19.1 5/8 190.5 6
5 254 23.9 185.7 163.6 36.6 36.6 8 22.4 3/4 215.9 7
6 279.4 25.4 215.9 192 39.6 39.6 8 22.4 3/4 241.3 9
8 342.9 28.4 269.7 246.1 44.5 44.5 8 22.4 3/4 298.5 14
10 406.4 30.2 323.9 304.8 49.3 49.3 12 25.4 7/8 362 20
12 482.6 31.8 381 365.3 55.6 55.6 12 25.4 7/8 431.8 29
14 533.4 35.1 412.8 400.1 57.2 57.2 12 28.4 1 476.3 41
16 596.9 36.6 469.9 457.2 63.5 63.5 16 28.4 1 539.8 44
18 635 39.6 533.4 505 68.3 68.3 16 31.8 1-1/8 577.9 59
20 698.5 42.9 584.2 558.8 73.2 73.2 20 31.8 1-1/8 635 75
24 812.8 47.8 692.2 663.4 82.6 82.6 20 35.1 1-1/4 749.3 100
Class 300 Threaded Flange Dimensions
Nominal Outside Dia Thick of Dia of Dia of Length Min Thread Min Counter No of Dia of Dia of Dia of Approx
Pipe Size of Flange Flange Raised Face Hub at Base thru Hub Length Bore Holes Holes Bolts Bolt Circle Weight
(D) (B) (G) (A) (H) (T) (Q) (L) (inch) (K) (kg)
1/2 95.3 14.2 35.1 38.1 22.4 15.7 23.6 4 15.7 1/2 66.5 1
3/4 117.3 15.7 42.9 47.8 25.4 15.7 29 4 19.1 5/8 82.6 1
1 124 17.5 50.8 53.8 26.9 17.5 35.8 4 19.1 5/8 88.9 1
1-1/4 133.4 19.1 63.5 63.5 26.9 20.6 44.5 4 19.1 5/8 98.6 2
1-1/2 155.4 20.6 73.2 69.9 30.2 22.4 50.5 4 22.4 3/4 114.3 3
2 165.1 22.4 91.9 84.1 33.3 28.4 63.5 8 19.1 5/8 127 3
2-1/2 190.5 25.4 104.6 100.1 38.1 31.8 76.2 8 22.4 3/4 149.4 5
3 209.6 28.4 127 117.3 42.9 31.8 92.2 8 22.4 3/4 168.1 6
3-1/2 228.6 30.2 139.7 133.4 44.5 36.6 104.9 8 22.4 3/4 184.2 8
4 254 31.8 157.2 146.1 47.8 36.6 117.6 8 22.4 3/4 200.2 10
5 279.4 35.1 185.7 177.8 50.8 42.9 144.5 8 22.4 3/4 235 13
6 317.5 36.6 215.9 206.2 52.3 46 171.5 12 22.4 3/4 269.7 18
8 381 41.1 269.7 260.4 62 50.8 222.3 12 25.4 7/8 330.2 26
10 444.5 47.8 323.9 320.5 66.5 55.6 276.4 16 28.4 1 387.4 37
12 520.7 50.8 381 374.7 73.2 60.5 328.7 16 31.8 1-1/8 450.9 52
14 584.2 53.8 412.8 425.5 76.2 63.5 360.4 20 31.8 1-1/8 514.4 75
16 647.7 57.2 469.9 482.6 82.6 68.3 411.2 20 35.1 1-1/4 571.5 86
18 711.2 60.5 533.4 533.4 88.9 69.9 462 24 35.1 1-1/4 628.7 113
20 774.7 63.5 584.2 587.2 95.3 73.2 512.8 24 35.1 1-1/4 685.8 143
24 914.4 69.9 692.2 701.5 106.4 82.6 614.4 24 41.1 1-1/2 812.8 215
Class 600 Threaded Flange Dimensions
Nominal Outside Dia Thick of Dia of Dia of Length Min Thread Min Counter No of Dia of Dia of Dia of Approx
Pipe Size of Flange Flange Raised Face Hub at Base thru Hub Length Bore Holes Holes Bolts Bolt Circle Weight
(D) (B) (G) (A) (H) (T) (Q) (L) (inch) (K) (kg)
1/2 95.3 14.2 35.1 38.1 22.4 15.7 23.6 4 15.7 1/2 66.5 1
3/4 117.3 15.7 42.9 47.8 25.4 15.7 29 4 19.1 5/8 82.6 1
1 124 17.5 50.8 53.8 26.9 17.5 35.8 4 19.1 5/8 88.9 2
1-1/4 133.4 20.6 63.5 63.5 28.4 20.6 44.5 4 19.1 5/8 98.6 2
1-1/2 155.4 22.4 73.2 69.9 31.8 22.4 50.5 4 22.4 3/4 114.3 3
2 165.1 25.4 91.9 84.1 36.6 28.4 63.5 8 19.1 5/8 127 4
2-1/2 190.5 28.4 104.6 100.1 41.1 31.8 76.2 8 22.4 3/4 149.4 6
3 209.6 31.8 127 117.3 46 35.1 92.2 8 22.4 3/4 168.1 7
3-1/2 228.6 35.1 139.7 133.4 49.3 39.6 104.9 8 25.4 7/8 184.2 10
4 273.1 38.1 157.2 152.4 53.8 41.1 117.6 8 25.4 7/8 215.9 17
5 330.2 44.5 185.7 189 60.5 47.8 144.5 8 28.4 1 266.7 29
6 355.6 47.8 215.9 222.3 66.5 50.8 171.5 12 28.4 1 292.1 36
8 419.1 55.6 269.7 273.1 76.2 57.2 222.3 12 31.8 1-1/8 349.3 52
10 508 63.5 323.9 342.9 85.9 65 276.4 16 35.1 1-1/4 431.8 77
12 558.8 66.5 381 400.1 91.9 69.9 328.7 20 35.1 1-1/4 489 91
14 603.3 69.9 412.8 431.8 93.7 2.9 360.4 20 38.1 1-3/8 527.1 104
16 685.8 76.2 469.9 495.3 106.4 77.7 411.2 20 41.1 1-1/2 603.3 150
18 743 82.6 533.4 546.1 117.3 79.2 462 20 44.5 1-5/8 654.1 181
20 812.8 88.9 584.2 609.6 127 82.6 512.8 24 44.5 1-5/8 723.9 231
24 939.8 101.6 692.2 717.6 139.7 91.9 614.4 24 50.8 1-7/8 838.2 331
Class 900 Threaded Flange Dimensions
Nominal Outside Dia Thick of Dia of Dia of Length Min Thread Min Counter No of Dia of Dia of Dia of Approx
Pipe Size of Flange Flange Raised Face Hub at Base thru Hub Length Bore Holes Holes Bolts Bolt Circle Weight
(D) (B) (G) (A) (H) (T) (Q) (L) (inch) (K) (kg)
1/2 120.7 22.4 35.1 38.1 31.8 22.4 23.6 4 22.4 3/4 82.6 2
3/4 130 25.4 42.9 44.5 35.1 25.4 29 4 22.4 3/4 88.9 2
1 149.4 28.4 50.8 52.3 41.1 28.4 35.8 4 25.4 7/8 101.6 4
1-1/4 158.8 28.4 63.5 63.5 41.1 30.2 44.5 4 25.4 7/8 111.3 4
1-1/2 177.8 31.8 73.2 69.9 44.5 31.8 50.5 4 28.4 1 124 5
2 215.9 38.1 91.9 104.6 57.2 38.1 63.5 8 25.4 7/8 165.1 11
2-1/2 244.3 41.1 104.6 124 63.5 47.8 76.2 8 28.4 1 190.5 16
3 241.3 38.1 127 127 53.8 41.1 92.2 8 25.4 7/8 190.5 12
4 292.1 44.5 157.2 158.8 69.9 47.8 117.6 8 31.8 1-1/8 235 24
5 349.3 50.8 185.7 190.5 79.2 53.8 144.5 8 35.1 1-1/4 279.4 38
6 381 55.6 215.9 235 85.9 57.2 171.5 12 31.8 1-1/8 317.5 50
8 469.9 63.5 269.7 298.5 101.6 63.5 222.3 12 38.1 1-3/8 393.7 77
10 546.1 69.9 323.9 368.3 108 71.4 276.4 16 38.1 1-3/8 469.9 111
12 609.6 79.2 381 419.1 117.3 76.2 328.7 20 38.1 1-3/8 533.4 147
14 641.4 85.9 412.8 450.9 130 82.6 360.4 20 41.1 1-1/2 558.8 181
16 704.9 88.9 469.9 508 133.4 85.9 411.2 20 44.5 1-5/8 616 193
18 787.4 101.6 533.4 565.2 152.4 88.9 462 20 50.8 1-7/8 685.8 272
20 857.3 108 584.2 622.3 158.8 91.9 512.8 20 53.8 2 749.3 331
24 1041.4 139.7 692.2 749.3 203.2 101.6 614.4 20 66.5 2-1/2 901.7 635
Class 1500 Threaded Flange Dimensions
Nominal Outside Dia Thick of Dia of Dia of Length Min Thread Min Counter No of Dia of Dia of Dia of Approx
Pipe Size of Flange Flange Raised Face Hub at Base thru Hub Length Bore Holes Holes Bolts Bolt Circle Weight
(D) (B) (G) (A) (H) (T) (Q) (L) (inch) (K) (kg)
1/2 120.7 22.4 35.1 38.1 31.8 22.4 23.6 4 22.4 3/4 82.6 2
3/4 130 25.4 42.9 44.5 35.1 25.4 29 4 22.4 3/4 88.9 2
1 149.4 28.4 50.8 52.3 41.1 28.4 35.8 4 25.4 7/8 101.6 4
1-1/4 158.8 28.4 63.5 63.5 41.1 30.2 44.5 4 25.4 7/8 111.3 4
1-1/2 177.8 31.8 73.2 69.9 44.5 31.8 50.5 4 28.4 1 124 5
2 215.9 38.1 91.9 104.6 57.2 38.1 63.5 8 25.4 7/8 165.1 11
2-1/2 244.3 41.1 104.6 124 63.5 47.8 76.2 8 28.4 1 190.5 16
Class 2500 Threaded Flange Dimensions
Nominal Outside Dia Thick of Dia of Dia of Length Min Thread Min Counter No of Dia of Dia of Dia of Approx
Pipe Size of Flange Flange Raised Face Hub at Base thru Hub Length Bore Holes Holes Bolts Bolt Circle Weight
(D) (B) (G) (A) (H) (T) (Q) (L) (inch) (K) (kg)
1/2 133.4 30.2 35.1 42.9 39.6 28.4 23.6 4 22.4 3/4 88.9 3
3/4 139.7 31.8 42.9 50.8 42.9 31.8 29 4 22.4 3/4 95.3 4
1 158.8 35.1 50.8 57.2 47.8 35.1 35.8 4 25.4 7/8 108 5
1-1/4 184.2 38.1 63.5 73.2 52.3 38.1 44.5 4 28.4 1 130 7
1-1/2 203.2 44.5 73.2 79.2 60.5 44.5 50.5 4 31.8 1-1/8 146.1 10
2 235 50.8 91.9 95.3 69.9 50.8 63.5 8 28.4 1 171.5 17
2-1/2 266.7 57.2 104.6 114.3 79.2 57.2 76.2 8 31.8 1-1/8 196.9 25
Materials and Grades:
Threaded flanges can be manufactured in a range of materials, depending on the specific requirements of your application. Common materials include:
- Carbon Steel (ASTM A105)
- Stainless Steel (ASTM A312, A182)
- Alloy Steel
- Nickel Alloys
- Duplex Steel
Advantages of Threaded Flanges:
- Easy Installation: Threaded flanges are ideal for situations where welding isn’t possible or convenient.
- Cost-Effective: Reduces the need for expensive welding equipment and labor.
- Flexible Design: Can be designed for any pressure or temperature requirements.
Applications
Threaded flanges are primarily used where welding isn’t feasible, or in applications that require frequent disassembly. Common uses include:
- Oil & gas pipelines
- Water treatment plants
- Chemical and petrochemical facilities
- HVAC systems
- Pressure vessels and reactors
