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Where welding is impractical or undesirable, carbon steel threaded flanges provide a straightforward mechanical connection for compatible threaded pipe. This flange is equipped with internal tapered threads that are compatible with external pipe threads, making the need for welding unnecessary. ASTM A105 carbon steel is the primary metal for these flanges, and there are some classes available, i.e., Class 150 and Class 300 per ASME B16.5. The installation of these flanges without welding can be helpful, especially when hot work is not allowed, and the threaded design allows for removing the connection easily. These flanges are generally suited to lower-pressure services where threaded joints are permitted by the applicable piping specification. Solitaire Overseas manufactures and supplies carbon steel threaded flanges with mill test certification, with hydrostatic testing and third-party inspection available when required.
| Parameter | Specification |
|---|---|
|
Standard |
ASTM A105, ASME B16.5, MSS SP44 |
|
Size Range |
NPS 1/2 inch to 24 inch |
|
Pressure Class |
Class 150, Class 300 |
|
Facing |
Raised Face or Flat Face |
|
Construction |
Forged, tapered internal thread, no welding required |
|
Testing |
Hydrostatic test, third party inspection on request |
|
Certification |
Mill Test Certificate EN 10204 3.1, 3.2 on request |
| Grade | C max | Mn | P max | S max | Si |
|---|---|---|---|---|---|
|
A105 |
0.35 |
0.60 to 1.05 |
0.035 |
0.040 |
0.10 to 0.35 |
| Grade | Tensile Strength min | Yield Strength min | Elongation min (%) |
|---|---|---|---|
|
A105 |
485 MPa (70 ksi) |
250 MPa (36 ksi) |
22 |
| Class | Approximate Rating at Ambient (psi) | Approximate Rating at Ambient (bar) |
|---|---|---|
|
150 |
285 |
20 |
|
300 |
740 |
51 |
For Class 600 and above, see ourCarbon Steel High Pressure Flanges range for the weld neck flanges that duty actually requires.
| NPS | Outside Diameter | Bolt Circle | Number of Bolt Holes | Bolt Hole Diameter | Flange Thickness |
|---|---|---|---|---|---|
|
1/2 inch |
89 |
60 |
4 |
16 |
10 |
|
1 inch |
108 |
79 |
4 |
16 |
13 |
|
2 inch |
152 |
121 |
4 |
19 |
18 |
|
4 inch |
229 |
190 |
8 |
19 |
22 |
|
6 inch |
279 |
241 |
8 |
22 |
24 |
|
8 inch |
343 |
298 |
8 |
22 |
27 |
|
12 inch |
483 |
432 |
12 |
25 |
30 |
For weights or sizes beyond this reference table, use ourFlange Weight Calculator.
NPT is standard. BSPT and other thread standards can be supplied on request. Always match the flange thread to the mating pipe or fitting.
Yes. Although tapered threads provide sealing, PTFE tape or suitable thread sealant is recommended for a reliable, service-compatible seal.
Generally, yes, if threads remain undamaged. Replace the flange if there is galling, thread damage, or excessive repeated reuse.
Threaded connections can loosen or leak under high pressure, vibration, and thermal cycling. Welded flanges provide a more reliable continuous load path.
Yes. Insufficient engagement can compromise sealing and strength. Verify engagement during installation against the applicable piping code and project requirements.
Contact Solitaire Overseas to get expert guidance and solutions for your projects.
Related ranges:Carbon Steel Flanges,Carbon Steel Pipe Flanges,Carbon Steel High Pressure Flanges,Carbon Steel Plate Flanges, andCarbon Steel Threaded Fittings.