Why is ASTM A105 coupling required?
Pipe couplings are standard devices in piping systems. They join different piping sections while allowing directional changes. An ASTM A105 coupling can join pipes of identical or different diameters, maintaining a strong flow rate. It has female pipe threads or sockets.
The best part about an A105 carbon steel coupling is that it does not need specialized equipment. It can adapt to higher temperatures in pressure systems. The tensile strength is impressive, as is the durability in industrial applications.
What is the difference between ASTM A105 half, full, and reducing coupling?
Manufacturers produce these couplings in different types to address application requirements. An ASTM A105 half coupling has a socket (or thread) on one side and applies to a small bore branching off a larger pipe. The other end of these components gets welded. These fittings can work even in tight spaces. (Clients may combine them with additional sealing elements based on the application.)
An ASTM A105 reducing coupling joins pipes of different diameters, and has diverse threads on either side. For example, they help when feeder lines connect to larger circuits. These fittings can accept pipes into both ends.
SA105 full couplings connect small bore pipes with sockets or threaded ends. They deliver secure connections but may need more space compared to half couplings.
What is an A105 Carbon Steel Coupling used for in plumbing?
Plumbing applications regularly use this coupling for smooth fluid flow, wastewater piping, and the avoidance of blockages. An ASTM A105N CS forged coupling can work to connect plumbing components like pipes and fixtures.
Besides joining pipes to change the piping system, these components can also help repair leaks and damage.
ASTM A105 Coupling specification
| Material | Sizes | Connection Types |
|---|---|---|
| ASTM A105 |
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| Types | Forging Methods | Surface |
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| Threads | ASME/ANSI | Test Certificates |
| NPT, BSPT, BSPP |
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Types of ASTM A105 coupling
ASTM A105n cs forged coupling
Carbon steel a105n threaded coupling
SA105 threaded full coupling
ASTM A105 reducing coupling
Carbon steel socket weld coupling
ASTM A105 carbon steel coupling
ASTM A105 Socket Weld Coupling dimensions
Class 3000 |
Nominal Pipe Size | 1/8 | 1/4 | 3/8 | 1/2 | 3/4 | 1 | 1 1/4 | 1 1/2 | 2 | 2 1/2 | 3 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 1 1/32 | 1 1/32 | 1 1/32 | 1 3/16 | 1 13/32 | 1 33/64 | 1 33/64 | 1 33/64 | 2 1/64 | 2 1/64 | 2 1/64 | 2 17/64 | |
| B | 3/4 | 7/8 | 1 1/16 | 1 1/4 | 1 1/2 | 1 13/16 | 2 1/4 | 2 1/2 | 23 | 3 5/8 | 4 5/16 | 5 1/2 | |
| C | 0.420 | 0.555 | 0.690 | 0.855 | 1.065 | 1.330 | 1.675 | 1.915 | 2.406 | 2.906 | 3.535 | 4.545 | |
| D | 7/16 | 7/16 | 7/16 | 1/2 | 9/16 | 5/8 | 11/16 | 3/4 | 7/8 | 7/8 | 1 | 1 1/8 | |
| E | 1/4 | 1/4 | 1/4 | 3/8 | 3/8 | 1/2 | 1/2 | 1/2 | 3/4 | 3/4 | 3/4 | 3/4 | |
| Wt | 0.125 | 0.125 | 0.125 | 0.188 | 0.313 | 0.563 | 0.813 | 1.000 | 2.000 | 2.625 | 3.875 | 6.625 | |
Class 6000 |
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| A | 1 1/16 | 1 1/8 | 1 1/8 | 1 5/32 | 1 13/32 | 1 33/64 | 1 33/64 | 1 33/64 | 2 1/64 | 2 1/64 | 2 1/64 | 2 17/64 | |
| B | 7/8 | 1 1/16 | 1 5/16 | 1 1/2 | 1 3/4 | 2 1/4 | 2 1/2 | 3 | 3 5/8 | 4 1/4 | 5 | 6 1/4 | |
| C | 0.420 | 0.555 | 0.690 | 0.855 | 1.065 | 1.330 | 1.675 | 1.915 | 2.406 | 2.906 | 3.535 | 4.545 | |
| D | 7/16 | 7/16 | 7/16 | 1/2 | 9/16 | 5/8 | 11/16 | 3/4 | 7/8 | 7/8 | 1 | 1 1/8 | |
| E | 1/4 | 1/4 | 1/4 | 3/8 | 3/8 | 1/2 | 1/2 | 1/2 | 3/4 | 3/4 | 3/4 | 3/4 | |
| Wt | - | - | - | 0.375 | 0.563 | 1.000 | 1.438 | 2.000 | 3.875 | 5.500 | 6.625 | 13.125 | |
Class 9000 XXS Bore |
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| A | - | - | - | 1 3/8 | 1 1/2 | 1 3/4 | 1 7/8 | 2 | 2 1/2 | ||||
| B | - | - | - | 1 13/16 | 2 | 2 3/8 | 2 3/4 | 3 1/16 | 3 5/8 | ||||
| C | - | - | - | 0.855 | 1.065 | 1.330 | 1.675 | 1.915 | 2.406 | ||||
| D | - | - | - | 1/2 | 9/16 | 5/8 | 11/16 | 3/4 | 7/8 | ||||
| E | - | - | - | 3/8 | 3/8 | 1/2 | 1/2 | 1/2 | 3/4 | ||||
| Wt | - | - | - | 0.75 | 1.06 | 1.69 | 2.22 | 2.81 | 4.66 |
A105N CS forged coupling chemical composition
| C | Si | Mn | Cu | S | V | P | Cr | Mo | Ni |
| 0.35 | 0.10–0.35 | 0.60–1.05 | 0.40 | 0.040 | 0.08 | 0.035 | 0.30 | 0.12 | 0.40 |
ASTM A105 threaded coupling mechanical properties
| Elongation | Tensile Properties | HB max |
|---|---|---|
| 22 % | 485(N/mm2) | 187 |
What is the pressure rating or class of ASTM A105 Carbon Steel Socket Weld Coupling?
These couplings offer a secure seal and are suitable for critical applications. An ASTM A105 carbon steel socket weld coupling has a working pressure rating of 3000 psi. You can also find components that meet higher-pressure requirements and classes.
They frequently work in high-pressure environments like plumbing, refrigeration, and vacuum applications. These fittings also operate in oil and gas pipelines, chemical industries, power plants, fabrication, and food processing.
How are ASME SA105 Couplings connected?
These components are straightforward to install, letting you use welding or threading. For instance, you can weld the half ASME SA105 couplings to a large bore pipe.
Threaded couplings don’t involve welding. They can get firmly tightened in place for a secure connection. Applications must ensure the use of compatible threads and limit friction during the installation.
Clients may also require a compression coupling to join aligned pipes. They use a tapered sleeve and flanges. Another type of coupling is slip or repair, wherein one tube slides out to facilitate damage resolution in cramped places.
Difference between UNF and SAE thread of ASTM A105 Threaded Coupling
Customers can see SAE and UNF threads when dealing with ASTM A105 threaded coupling. The former refers to the Society of Automotive Engineers and has a 45° flare. UNF, or Unified National Fine threads, have a 60° thread angle with a round crest.
Interestingly, the two were virtually identical for A105N thread pipe coupling for a long time. In the late 1940s, after thread unification, the SAE branched into Unified National Coarse (UNC) and UNF threads. Here, the included angle is 60°. Connecting per the thread types and characteristics is vital to ensure the integrity of the coupling.