ASME/ANSI B16.5 Weld Neck Flange
Our company provides ASME/ANSI B16.5 Weld Neck Flange.
The weld neck flange is a common type of flange that is designed to be butt-welded to the pipe. It has a long, tapered hub that helps to reduce stress on the pipe and provides a smooth transition for the flow of fluid. The weld neck flange is commonly used in high-pressure and high-temperature applications.
lewis Liu
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ASME/ANSI B16.5 Weld Neck Flange
ASME/ANSI B16.5 Class 150 Welding Neck Flanges
(A)All dimensions are in inches.
(B)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!
(C)Standard Bore will be furnished unless otherwise specified. For more diameter of holes, please click here!
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3.50 | 2.38 | 1.38 | 4 | 0.62 | 0.62 | 0.84 | 1.19 | 0.38 | 1.81 | 2 |
| 3/4 | 3.88 | 2.75 | 1.69 | 4 | 0.62 | 0.82 | 1.05 | 1.50 | 0.44 | 2.00 | 2 |
| 1 | 4.25 | 3.12 | 2.00 | 4 | 0.62 | 1.05 | 1.32 | 1.94 | 0.50 | 2.12 | 3 |
| 1 1/4 | 4.62 | 3.50 | 2.50 | 4 | 0.62 | 1.38 | 1.66 | 2.31 | 0.56 | 2.19 | 3 |
| 1 1/2 | 5.00 | 3.88 | 2.88 | 4 | 0.62 | 1.61 | 1.90 | 2.56 | 0.62 | 2.38 | 4 |
| 2 | 6.00 | 4.75 | 3.62 | 4 | 0.75 | 2.07 | 2.38 | 3.06 | 0.69 | 2.44 | 6 |
| 2 1/2 | 7.00 | 5.50 | 4.12 | 4 | 0.75 | 2.47 | 2.88 | 3.56 | 0.81 | 2.69 | 8 |
| 3 | 7.50 | 6.00 | 5.00 | 4 | 0.75 | 3.07 | 3.50 | 4.25 | 0.88 | 2.69 | 10 |
| 3 1/2 | 8.50 | 7.00 | 5.50 | 8 | 0.75 | 3.55 | 4.00 | 4.81 | 0.88 | 2.75 | 12 |
| 4 | 9.00 | 7.50 | 6.19 | 8 | 0.75 | 4.03 | 4.50 | 5.31 | 0.88 | 2.94 | 15 |
| 5 | 10.00 | 8.50 | 7.31 | 8 | 0.88 | 5.05 | 5.56 | 6.44 | 0.88 | 3.44 | 19 |
| 6 | 11.00 | 9.50 | 8.50 | 8 | 0.88 | 6.07 | 6.63 | 7.56 | 0.94 | 3.44 | 24 |
| 8 | 13.50 | 11.75 | 10.62 | 8 | 0.88 | 7.98 | 8.63 | 9.69 | 1.06 | 3.94 | 39 |
| 10 | 16.00 | 14.25 | 12.75 | 12 | 1.00 | 10.02 | 10.75 | 12.00 | 1.12 | 3.94 | 52 |
| 12 | 19.00 | 17.00 | 15.00 | 12 | 1.00 | 12.00 | 12.75 | 14.38 | 1.19 | 4.44 | 80 |
| 14 | 21.00 | 18.75 | 16.25 | 12 | 1.12 | 13.25 | 14.00 | 15.75 | 1.31 | 4.94 | 110 |
| 16 | 23.50 | 21.25 | 18.50 | 16 | 1.12 | 15.25 | 16.00 | 18.00 | 1.38 | 4.94 | 140 |
| 18 | 25.00 | 22.75 | 21.00 | 16 | 1.25 | 17.25 | 18.00 | 19.88 | 1.50 | 5.44 | 150 |
| 20 | 27.50 | 25.00 | 23.00 | 20 | 1.25 | 19.25 | 20.00 | 22.00 | 1.62 | 5.62 | 180 |
| 22 | 29.50 | 27.25 | 25.25 | 20 | 1.38 | 21.25 | 22.00 | 24.00 | 1.75 | 5.82 | 225 |
| 24 | 32.00 | 29.50 | 27.25 | 20 | 1.38 | 23.25 | 24.00 | 26.12 | 1.81 | 5.94 | 260 |
ASME/ANSI B16.5 Class 300 Welding Neck Flanges
(A)All dimensions are in inches.
(B)These flanges will be furnished with a 1/16″ raised face unless otherwise specified. For more alternate flange facings, please click here!
(C)Standard Bore will be furnished unless otherwise specified. For more diameter of holes, please click here!
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 2.62 | 1.38 | 4 | 0.63 | 0.62 | 0.84 | 1.50 | 0.50 | 2.00 | 2 |
| 3/4 | 4.62 | 3.25 | 1.69 | 4 | 0.75 | 0.82 | 1.05 | 1.88 | 0.56 | 2.19 | 3 |
| 1 | 4.88 | 3.50 | 2.00 | 4 | 0.75 | 1.05 | 1.32 | 2.12 | 0.62 | 2.38 | 4 |
| 1 1/4 | 5.25 | 3.88 | 2.50 | 4 | 0.75 | 1.38 | 1.66 | 2.50 | 0.69 | 2.50 | 5 |
| 1 1/2 | 6.12 | 4.50 | 2.88 | 4 | 0.88 | 1.61 | 1.90 | 2.75 | 0.75 | 2.63 | 7 |
| 2 | 6.50 | 5.00 | 3.62 | 8 | 0.75 | 2.07 | 2.38 | 3.31 | 0.81 | 2.69 | 9 |
| 2 1/2 | 7.50 | 5.88 | 4.12 | 8 | 0.88 | 2.47 | 2.88 | 3.94 | 0.94 | 2.94 | 12 |
| 3 | 8.25 | 6.62 | 5.00 | 8 | 0.88 | 3.07 | 3.50 | 4.62 | 1.06 | 3.06 | 15 |
| 3 1/2 | 9.00 | 7.25 | 5.50 | 8 | 0.88 | 3.55 | 4.00 | 5.25 | 1.12 | 3.13 | 18 |
| 4 | 10.00 | 7.88 | 6.19 | 8 | 0.88 | 4.03 | 4.50 | 5.75 | 1.19 | 3.32 | 25 |
| 5 | 11.00 | 9.25 | 7.31 | 8 | 0.88 | 5.05 | 5.56 | 7.00 | 1.31 | 3.82 | 32 |
| 6 | 12.50 | 10.62 | 8.50 | 12 | 0.88 | 6.07 | 6.63 | 8.12 | 1.38 | 3.82 | 42 |
| 8 | 15.00 | 13.00 | 10.62 | 12 | 1.00 | 7.98 | 8.63 | 10.25 | 1.56 | 4.32 | 67 |
| 10 | 17.50 | 15.25 | 12.75 | 16 | 1.12 | 10.02 | 10.75 | 12.62 | 1.81 | 4.56 | 91 |
| 12 | 20.50 | 17.75 | 15.00 | 16 | 1.25 | 12.00 | 12.75 | 14.75 | 1.94 | 5.06 | 140 |
| 14 | 23.00 | 20.25 | 16.25 | 20 | 1.25 | 13.25 | 14.00 | 16.75 | 2.06 | 5.56 | 180 |
| 16 | 25.50 | 22.50 | 18.50 | 20 | 1.38 | 15.25 | 16.00 | 19.00 | 2.19 | 5.65 | 250 |
| 18 | 28.00 | 24.75 | 21.00 | 24 | 1.38 | 17.25 | 18.00 | 21.00 | 2.31 | 6.19 | 320 |
| 20 | 30.50 | 27.00 | 23.00 | 24 | 1.38 | 19.25 | 20.00 | 23.12 | 2.44 | 6.32 | 400 |
| 22 | 33.00 | 29.25 | 25.25 | 24 | 1.63 | 21.25 | 22.00 | 25.25 | 2.56 | 6.44 | 465 |
| 24 | 36.00 | 32.00 | 27.25 | 24 | 1.63 | 23.25 | 24.00 | 27.62 | 2.69 | 6.56 | 580 |
ASME/ANSI B16.5 Class 400 Welding Neck Flanges
(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 2.62 | 1.38 | 4 | 0.63 | Specified by purchaser | 0.84 | 1.50 | 0.56 | 2.06 | 2 |
| 3/4 | 4.62 | 3.25 | 1.69 | 4 | 0.75 | Specified by purchaser | 1.05 | 1.88 | 0.62 | 2.25 | 4 |
| 1 | 4.88 | 3.50 | 2.00 | 4 | 0.75 | Specified by purchaser | 1.32 | 2.12 | 0.69 | 2.44 | 4 |
| 1 1/4 | 5.25 | 3.88 | 2.50 | 4 | 0.75 | Specified by purchaser | 1.66 | 2.50 | 0.81 | 2.63 | 6 |
| 1 1/2 | 6.12 | 4.50 | 2.88 | 4 | 0.88 | Specified by purchaser | 1.90 | 2.75 | 0.88 | 2.75 | 8 |
| 2 | 6.50 | 5.00 | 3.62 | 8 | 0.75 | Specified by purchaser | 2.38 | 3.31 | 1.00 | 2.88 | 12 |
| 2 1/2 | 7.50 | 5.88 | 4.12 | 8 | 0.88 | Specified by purchaser | 2.88 | 3.94 | 1.12 | 3.12 | 18 |
| 3 | 8.25 | 6.62 | 5.00 | 8 | 0.88 | Specified by purchaser | 3.50 | 4.62 | 1.25 | 3.25 | 23 |
| 3 1/2 | 9.00 | 7.25 | 5.50 | 8 | 1.00 | Specified by purchaser | 4.00 | 5.25 | 1.38 | 3.38 | 26 |
| 4 | 10.00 | 7.88 | 6.19 | 8 | 1.00 | Specified by purchaser | 4.50 | 5.75 | 1.38 | 3.50 | 35 |
| 5 | 11.00 | 9.25 | 7.31 | 8 | 1.00 | Specified by purchaser | 5.56 | 7.00 | 1.50 | 4.00 | 43 |
| 6 | 12.50 | 10.62 | 8.50 | 12 | 1.00 | Specified by purchaser | 6.63 | 8.12 | 1.62 | 4.06 | 57 |
| 8 | 15.00 | 13.00 | 10.62 | 12 | 1.13 | Specified by purchaser | 8.63 | 10.25 | 1.88 | 4.62 | 89 |
| 10 | 17.50 | 15.25 | 12.75 | 16 | 1.25 | Specified by purchaser | 10.75 | 12.62 | 2.12 | 4.88 | 125 |
| 12 | 20.50 | 17.75 | 15.00 | 16 | 1.38 | Specified by purchaser | 12.75 | 14.75 | 2.25 | 5.38 | 175 |
| 14 | 23.00 | 20.25 | 16.25 | 20 | 1.38 | Specified by purchaser | 14.00 | 16.75 | 2.38 | 5.88 | 230 |
| 16 | 25.50 | 22.50 | 18.50 | 20 | 1.50 | Specified by purchaser | 16.00 | 19.00 | 2.50 | 6.00 | 295 |
| 18 | 28.00 | 24.75 | 21.00 | 24 | 1.50 | Specified by purchaser | 18.00 | 21.00 | 2.62 | 6.50 | 350 |
| 20 | 30.50 | 27.00 | 23.00 | 24 | 1.63 | Specified by purchaser | 20.00 | 23.13 | 2.75 | 6.62 | 425 |
| 22 | 33.00 | 29.25 | 25.25 | 24 | 1.75 | Specified by purchaser | 22.00 | 25.25 | 2.88 | 6.75 | 505 |
| 24 | 36.00 | 32.00 | 27.25 | 24 | 1.88 | Specified by purchaser | 24.00 | 27.62 | 3.00 | 6.88 | 620 |
ASME/ANSI B16.5 Class 600 Welding Neck Flanges
(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 3.75 | 2.62 | 1.38 | 4 | 0.63 | Specified by purchaser | 0.84 | 1.50 | 0.56 | 2.06 | 2 |
| 3/4 | 4.62 | 3.25 | 1.69 | 4 | 0.75 | Specified by purchaser | 1.05 | 1.88 | 0.62 | 2.25 | 4 |
| 1 | 4.88 | 3.50 | 2.00 | 4 | 0.75 | Specified by purchaser | 1.32 | 2.12 | 0.69 | 2.44 | 4 |
| 1 1/4 | 5.25 | 3.88 | 2.50 | 4 | 0.75 | Specified by purchaser | 1.66 | 2.50 | 0.81 | 2.62 | 6 |
| 1 1/2 | 6.12 | 4.50 | 2.88 | 4 | 0.88 | Specified by purchaser | 1.90 | 2.75 | 0.88 | 2.75 | 8 |
| 2 | 6.50 | 5.00 | 3.62 | 8 | 0.75 | Specified by purchaser | 2.38 | 3.31 | 1.00 | 2.88 | 12 |
| 2 1/2 | 7.50 | 5.88 | 4.12 | 8 | 0.88 | Specified by purchaser | 2.88 | 3.94 | 1.12 | 3.12 | 18 |
| 3 | 8.25 | 6.62 | 5.00 | 8 | 0.88 | Specified by purchaser | 3.50 | 4.62 | 1.25 | 3.25 | 23 |
| 3 1/2 | 9.00 | 7.25 | 5.50 | 8 | 1.00 | Specified by purchaser | 4.00 | 5.25 | 1.38 | 3.38 | 26 |
| 4 | 10.75 | 8.50 | 6.19 | 8 | 1.00 | Specified by purchaser | 4.50 | 6.00 | 1.50 | 4.00 | 42 |
| 5 | 13.00 | 10.50 | 7.31 | 8 | 1.13 | Specified by purchaser | 5.56 | 7.44 | 1.75 | 4.50 | 68 |
| 6 | 14.00 | 11.50 | 8.50 | 12 | 1.13 | Specified by purchaser | 6.63 | 8.75 | 1.88 | 4.62 | 81 |
| 8 | 16.50 | 13.75 | 10.62 | 12 | 1.25 | Specified by purchaser | 8.63 | 10.75 | 2.19 | 5.25 | 120 |
| 10 | 20.00 | 17.00 | 12.75 | 16 | 1.38 | Specified by purchaser | 10.75 | 13.50 | 2.50 | 6.00 | 190 |
| 12 | 22.00 | 19.25 | 15.00 | 20 | 1.38 | Specified by purchaser | 12.75 | 15.75 | 2.62 | 6.12 | 225 |
| 14 | 23.75 | 20.75 | 16.25 | 20 | 1.50 | Specified by purchaser | 14.00 | 17.00 | 2.75 | 6.50 | 280 |
| 16 | 27.00 | 23.75 | 18.50 | 20 | 1.63 | Specified by purchaser | 16.00 | 19.50 | 3.00 | 7.00 | 390 |
| 18 | 29.25 | 25.75 | 21.00 | 20 | 1.75 | Specified by purchaser | 18.00 | 21.50 | 3.25 | 7.25 | 475 |
| 20 | 32.00 | 28.50 | 23.00 | 24 | 1.75 | Specified by purchaser | 20.00 | 24.00 | 3.50 | 7.50 | 590 |
| 22 | 34.25 | 30.62 | 25.25 | 24 | 1.88 | Specified by purchaser | 22.00 | 26.25 | 3.75 | 7.75 | 720 |
| 24 | 37.00 | 33.00 | 27.25 | 24 | 2.00 | Specified by purchaser | 24.00 | 28.25 | 4.00 | 8.00 | 830 |
ASME/ANSI B16.5 Class 900 Welding Neck Flanges
(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 3.25 | 1.38 | 4 | 0.88 | Specified by purchaser | 0.84 | 1.50 | 0.88 | 2.38 | 5 |
| 3/4 | 5.12 | 3.50 | 1.69 | 4 | 0.88 | Specified by purchaser | 1.05 | 1.75 | 1.00 | 2.75 | 6 |
| 1 | 5.88 | 4.00 | 2.00 | 4 | 1.00 | Specified by purchaser | 1.32 | 2.06 | 1.12 | 2.88 | 9 |
| 1 1/4 | 6.25 | 4.38 | 2.50 | 4 | 1.00 | Specified by purchaser | 1.66 | 2.50 | 1.12 | 2.88 | 10 |
| 1 1/2 | 7.00 | 4.88 | 2.88 | 4 | 1.13 | Specified by purchaser | 1.90 | 2.75 | 1.25 | 3.25 | 13 |
| 2 | 8.50 | 6.50 | 3.62 | 8 | 1.00 | Specified by purchaser | 2.38 | 4.12 | 1.50 | 4.00 | 25 |
| 2 1/2 | 9.62 | 7.50 | 4.12 | 8 | 1.13 | Specified by purchaser | 2.88 | 4.88 | 1.62 | 4.12 | 36 |
| 3 | 9.50 | 7.50 | 5.00 | 8 | 1.00 | Specified by purchaser | 3.50 | 5.00 | 1.50 | 4.00 | 31 |
| 4 | 11.50 | 9.25 | 6.19 | 8 | 1.25 | Specified by purchaser | 4.50 | 6.25 | 1.75 | 4.50 | 53 |
| 5 | 13.75 | 11.00 | 7.31 | 8 | 1.38 | Specified by purchaser | 5.56 | 7.50 | 2.00 | 5.00 | 86 |
| 6 | 15.00 | 12.50 | 8.50 | 12 | 1.25 | Specified by purchaser | 6.63 | 9.25 | 2.19 | 5.50 | 110 |
| 8 | 18.50 | 15.50 | 10.62 | 12 | 1.50 | Specified by purchaser | 8.63 | 11.75 | 2.50 | 6.38 | 175 |
| 10 | 21.50 | 18.50 | 12.75 | 16 | 1.50 | Specified by purchaser | 10.75 | 14.50 | 2.75 | 7.25 | 260 |
| 12 | 24.00 | 21.00 | 15.00 | 20 | 1.50 | Specified by purchaser | 12.75 | 16.50 | 3.12 | 7.88 | 325 |
| 14 | 25.25 | 22.00 | 16.25 | 20 | 1.63 | Specified by purchaser | 14.00 | 17.75 | 3.38 | 8.38 | 400 |
| 16 | 27.75 | 24.25 | 18.50 | 20 | 1.75 | Specified by purchaser | 16.00 | 20.00 | 3.50 | 8.50 | 495 |
| 18 | 31.00 | 27.00 | 21.00 | 20 | 2.00 | Specified by purchaser | 18.00 | 22.25 | 4.00 | 9.00 | 680 |
| 20 | 33.75 | 29.50 | 23.00 | 20 | 2.13 | Specified by purchaser | 20.00 | 24.50 | 4.25 | 9.75 | 830 |
| 24 | 41.00 | 35.50 | 27.25 | 20 | 2.63 | Specified by purchaser | 24.00 | 29.50 | 5.50 | 11.50 | 1500 |
ASME/ANSI B16.5 Class 1500 Welding Neck Flanges
(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 | 3.25 | 1.38 | 4 | 0.88 | Specified by purchaser | 0.84 | 1.50 | 0.88 | 2.38 | 5 |
| 3/4 | 5.12 | 3.50 | 1.69 | 4 | 0.88 | Specified by purchaser | 1.05 | 1.75 | 1.00 | 2.75 | 6 |
| 1 | 5.88 | 4.00 | 2.00 | 4 | 1.00 | Specified by purchaser | 1.32 | 2.06 | 1.12 | 2.88 | 9 |
| 1 1/4 | 6.25 | 4.38 | 2.50 | 4 | 1.00 | Specified by purchaser | 1.66 | 2.50 | 1.12 | 2.88 | 10 |
| 1 1/2 | 7.00 | 4.88 | 2.88 | 4 | 1.13 | Specified by purchaser | 1.90 | 2.75 | 1.25 | 3.25 | 13 |
| 2 | 8.50 | 6.50 | 3.62 | 8 | 1.00 | Specified by purchaser | 2.38 | 4.12 | 1.50 | 4.00 | 25 |
| 2 1/2 | 9.62 | 7.50 | 4.12 | 8 | 1.13 | Specified by purchaser | 2.88 | 4.88 | 1.62 | 4.12 | 36 |
| 3 | 10.50 | 8.00 | 5.00 | 8 | 1.25 | Specified by purchaser | 3.50 | 5.25 | 1.88 | 4.62 | 48 |
| 4 | 12.25 | 9.50 | 6.19 | 8 | 1.38 | Specified by purchaser | 4.50 | 6.38 | 2.12 | 4.88 | 73 |
| 5 | 14.75 | 11.50 | 7.31 | 8 | 1.63 | Specified by purchaser | 5.56 | 7.75 | 2.88 | 6.12 | 130 |
| 6 | 15.50 | 12.50 | 8.50 | 12 | 1.50 | Specified by purchaser | 6.63 | 9.00 | 3.25 | 6.75 | 165 |
| 8 | 19.00 | 15.50 | 10.62 | 12 | 1.75 | Specified by purchaser | 8.63 | 11.50 | 3.62 | 8.38 | 275 |
| 10 | 23.00 | 19.00 | 12.75 | 12 | 2.00 | Specified by purchaser | 10.75 | 14.50 | 4.25 | 10.00 | 455 |
| 12 | 26.50 | 22.50 | 15.00 | 16 | 2.13 | Specified by purchaser | 12.75 | 17.75 | 4.88 | 11.12 | 690 |
| 14 | 29.50 | 25.00 | 16.25 | 16 | 2.38 | Specified by purchaser | 14.00 | 19.50 | 5.25 | 11.75 | 940 |
| 16 | 32.50 | 27.75 | 18.50 | 16 | 2.63 | Specified by purchaser | 16.00 | 21.75 | 5.75 | 12.25 | 1250 |
| 18 | 36.00 | 30.50 | 21.00 | 16 | 2.88 | Specified by purchaser | 18.00 | 23.50 | 6.38 | 12.88 | 1625 |
| 20 | 38.75 | 32.75 | 23.00 | 16 | 3.13 | Specified by purchaser | 20.00 | 25.25 | 7.00 | 14.00 | 2050 |
| 24 | 46.00 | 39.00 | 27.25 | 16 | 3.63 | Specified by purchaser | 24.00 | 30.00 | 8.00 | 16.00 | 3325 |
ASME/ANSI B16.5 Class 2500 Welding Neck Flanges
(a)All dimensions are in inches.
(b)These flanges will be furnished with a 1/4″ raised face unless otherwise specified. For more alternate flange facings, please click here!
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Point of Weld (A) | Hub Diameter (X) | Thickness (T) | Length Thru Hub (Y) | Approximate Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 5.25 | 3.50 | 1.38 | 4 | 0.88 | Specified by purchaser | 0.84 | 1.69 | 1.19 | 2.88 | 7 |
| 3/4 | 5.50 | 3.75 | 1.69 | 4 | 0.88 | Specified by purchaser | 1.05 | 2.00 | 1.25 | 3.12 | 8 |
| 1 | 6.25 | 4.25 | 2.00 | 4 | 1.00 | Specified by purchaser | 1.32 | 2.25 | 1.38 | 3.50 | 12 |
| 1 1/4 | 7.25 | 5.12 | 2.50 | 4 | 1.13 | Specified by purchaser | 1.66 | 2.88 | 1.50 | 3.75 | 17 |
| 1 1/2 | 8.00 | 5.75 | 2.88 | 4 | 1.25 | Specified by purchaser | 1.90 | 3.12 | 1.75 | 4.38 | 25 |
| 2 | 9.25 | 6.75 | 3.62 | 8 | 1.13 | Specified by purchaser | 2.38 | 3.75 | 2.00 | 5.00 | 42 |
| 2 1/2 | 10.50 | 7.75 | 4.12 | 8 | 1.25 | Specified by purchaser | 2.88 | 4.50 | 2.25 | 5.62 | 52 |
| 3 | 12.00 | 9.00 | 5.00 | 8 | 1.38 | Specified by purchaser | 3.50 | 5.25 | 2.62 | 6.62 | 94 |
| 4 | 14.00 | 10.75 | 6.19 | 8 | 1.63 | Specified by purchaser | 4.50 | 6.50 | 3.00 | 7.50 | 145 |
| 5 | 16.50 | 12.75 | 7.31 | 8 | 1.88 | Specified by purchaser | 5.56 | 8.00 | 3.62 | 9.00 | 245 |
| 6 | 19.00 | 14.50 | 8.50 | 8 | 2.13 | Specified by purchaser | 6.63 | 9.25 | 4.25 | 10.75 | 380 |
| 8 | 21.75 | 17.25 | 10.62 | 12 | 2.13 | Specified by purchaser | 8.63 | 12.00 | 5.00 | 12.50 | 580 |
| 10 | 26.50 | 21.25 | 12.75 | 12 | 2.63 | Specified by purchaser | 10.75 | 14.75 | 6.50 | 16.50 | 1075 |
| 12 | 30.00 | 24.38 | 15.00 | 12 | 2.88 | Specified by purchaser | 12.75 | 17.38 | 7.25 | 18.25 | 1525 |
Here is a table outlining the specifications and characteristics of ASME/ANSI B16.5 Weld Neck Flanges:
| Specification/Feature | Description |
|---|---|
| Standard | ASME/ANSI B16.5 Weld Neck Flange. |
| Type | Weld Neck Flange – A type of flange with a long tapered neck that is butt-welded to the pipe, providing excellent strength and stress distribution. |
| Pressure Ratings | Available in different pressure classes, such as 150, 300, 600, 900, 1500, 2500, etc., to accommodate varying pressure requirements. |
| Size Range | Typically available in sizes ranging from 1/2 inches to 48 inches or larger, suitable for various pipe and equipment sizes. |
| Materials | ASME/ANSI B16.5 Weld Neck Flanges can be manufactured from materials like carbon steel, stainless steel, alloy steel, and more, chosen based on application requirements. |
| Facing Types | Common facing types include Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ), and Male and Female (M&F) facings, impacting sealing methods. |
| Bolt Hole Quantity and Diameter | The number and diameter of bolt holes vary with flange size and pressure rating, facilitating flange connection. |
| Connection Method | ASME/ANSI B16.5 Weld Neck Flanges are butt-welded to the pipe, providing a strong and leak-resistant connection. |
| Application Areas | Weld Neck Flanges are widely used in industries such as oil and gas, petrochemical, power generation, and more for connecting high-pressure piping systems. |
| Standards and Codes | ASME/ANSI B16.5 Weld Neck Flanges adhere to standards set by the American National Standards Institute (ANSI) and nominal pipe size (NPS) standards, such as ANSI B16.5. |
| Seal Types | Weld Neck Flanges commonly use gaskets or O-rings for sealing, with the choice of seal type depending on the application and pressure rating. |
| Accessories and Attachments | Some applications may require additional components such as flange gaskets, bolts, nuts, flange covers, or flange cover gaskets. |
| Inspection and Testing | ASME/ANSI B16.5 Weld Neck Flanges typically undergo a series of inspections and tests to ensure they meet quality and performance requirements, in compliance with standards. |
| Marking and Certification | Weld Neck Flanges should be marked with the manufacturer’s identification, size, class, material, and other relevant information. Some flanges may require specific certifications such as PED or ASME. |
| Installation and Maintenance | Proper installation and regular maintenance of Weld Neck Flanges, including weld integrity, bolt torque, flange face cleaning, and lubrication, are crucial for system integrity and performance. |
| Application Standards | In specific industries and applications, there may be industry-specific Weld Neck Flange application standards that need to be adhered to for safety and performance. |
This table provides a comprehensive overview of ASME/ANSI B16.5 Weld Neck Flanges, covering key specifications, characteristics, and additional considerations. Specific details and requirements may vary based on the chosen flange size, pressure rating, and material.
ASME/ANSI B16.5 Weld Neck Flange is a specific type of weld neck flange that is designed and manufactured according to the ASME/ANSI B16.5 standard. This standard specifies the dimensions, materials, and testing requirements for flanges used in pipeline applications.
The ASME/ANSI B16.5 Weld Neck Flange has a long, tapered hub that is welded to the pipe. The tapered hub helps to reduce stress on the pipe and provides a smooth transition for the flow of fluid. The flange has a raised face that is used to create a seal between the flange and the gasket. The raised face also provides reinforcement for the bolt holes.
The ASME/ANSI B16.5 Weld Neck Flange is commonly used in high-pressure and high-temperature applications where the flange and the piping system are subject to extreme stress and vibration. The design of the flange provides a strong and reliable connection that can withstand the pressure and temperature fluctuations of the system.
The ASME/ANSI B16.5 Weld Neck Flange is available in various materials such as carbon steel, stainless steel, and alloy steel, among others. The selection of the material depends on the specific requirements of the application, such as the pressure, temperature, and corrosion resistance of the piping system.
The ASME/ANSI B16.5 standard specifies the dimensions and tolerances of the flange, including the outside diameter, bolt circle diameter, bolt hole diameter, and thickness. The standard also specifies the marking requirements and the testing procedures to ensure the quality and performance of the flange.
In summary, the ASME/ANSI B16.5 Weld Neck Flange is a specific type of flange that is designed and manufactured according to a standard that specifies the dimensions, materials, and testing requirements for flanges used in pipeline applications. This type of flange is commonly used in high-pressure and high-temperature applications and provides a strong and reliable connection that can withstand the stress and vibration of the system. Proper selection, installation, and maintenance of the ASME/ANSI B16.5 Weld Neck Flange is crucial to ensure a safe and reliable operation of the piping system.