A105 Threaded (NPT/BSPT) Coupling ASME B16.11, Carbon Steel Forged fitting for Oil & gas pipelines
A105 Threaded (NPT/BSPT) Coupling ASME B16.11, Carbon Steel Forged fitting for Oil & gas pipelines
What Is ASTM A105 Carbon Steel Coupling?
A105 Threaded Coupling is a forged carbon steel pipe fitting used to join two threaded pipes in a straight line. Made from ASTM A105 material, it features internal NPT threads on both ends and is rated for high-pressure service (2000#–9000# per ASME B16.11). Common in oil & gas, petrochemical, and power industries, it provides a reliable, leak-tight connection without welding.
A105 vs. A105N
| A105 | A105N |
|---|---|---|
Heat Treatment | As-forged | Normalized |
Grain Structure | Coarser | Finer, more uniform |
Impact Resistance | Lower | Better |
Preferred For | General use | Critical applications |
Types of Couplings
Type | Description |
|---|---|
Full Coupling | Threaded both ends |
Half Coupling | Threaded one end, other end for welding |
Reducing Coupling | Connects different pipe sizes |
Pressure Ratings (ASME B16.11)
Class | Maximum Pressure |
|---|---|
2000# | 2,000 psi |
3000# | 3,000 psi |
6000# | 6,000 psi |
9000# | 9,000 psi |
Chemical Composition of A105 Carbon Steel Coupling
C | Mn | P | S | Si |
0.15 | 0.6-1.0 | 0.035 | 0.04 | 0.1 |
Mechanical Properties of ASTM A105 Carbon Steel Coupling
| Property | Value |
|---|---|
| Grade | ASTM A105 / A105N (normalized) |
| Type | Forged carbon steel |
| Carbon Content | ≤ 0.35% |
| Tensile Strength | ≥ 70,000 psi |
| Yield Strength | ≥ 36,000 psi |
| Temperature Range | -20°F to 1000°F |
Tolerance Chart Of ASTM A105 Carbon Steel Coupling
Dimensions | Up to 2" NB | 2 1/2" & 3" NB | |
• Socket Bore | + 0.25 | + 0.38 | |
- 0.00 | - 0.00 | ||
• Body Bore | + 0.00 | + 0.00 | |
- 1.52 | - 3.00 | ||
A | 1/4" NB | ± 0.8 | ± 2.50 |
3/8" TO 3/4" NB | ± 1.6 | ||
1"T0 2"NB | ± 2.0 | ||
Key Applications of A105 Coupling
Oil & gas pipelines
Petrochemical plants
Power generation
High-pressure steam systems
General industrial piping
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