Manufacturer, Supplier & Exporter of Carbon Steel Threaded Coupling

Carbon Steel Threaded Coupling is a widely used forged pipe fitting that connects two pipes of the same diameter through threaded ends. Designed for low to moderate-pressure piping systems, this coupling provides a secure and leak-proof threaded connection without the need for welding. It is especially useful in systems that may require periodic dismantling for maintenance or repair. These fittings are ideal for industries like chemical processing, oil & gas, power generation, and water treatment where ease of installation and corrosion resistance are essential..

Riddhi Siddhi Impex, a trusted name in industrial piping solutions, is a leading manufacturer and domestic supplier of Carbon Steel Threaded Coupling in India. Known for precision engineering and high-quality materials, the company produces threaded couplings as per international standards such as ASME B16.11, MSS-SP 83, and ASTM A105. With advanced manufacturing units and a skilled technical team, they ensure superior product finish, dimensional accuracy, and consistent mechanical properties..

Riddhi Siddhi Impex offers threaded couplings in various pressure classes including 2000 LBS, 3000 LBS, and 6000 LBS, and with thread types like NPT (National Pipe Thread) and BSP (British Standard Pipe). Their carbon steel couplings are commonly manufactured from materials such as ASTM A105, A350 LF2, and A694 F52–F70, which are known for excellent strength, temperature tolerance, and durability. The fittings are subjected to stringent testing procedures, including visual inspection, pressure tests, and dimensional checks before dispatch..

As a well-established Carbon Steel Threaded Coupling domestic supplier, Riddhi Siddhi Impex has built a robust distribution network across major Indian industrial hubs. In metro cities like Mumbai, Delhi, Bengaluru (Bangalore), Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, and Surat, their threaded couplings are widely used in urban infrastructure projects, refineries, and large-scale process industries. These cities host key sectors that rely on durable threaded fittings for efficient pipeline operations..

The company’s reach also extends to rapidly growing Tier-2 and Tier-3 cities such as Vadodara, Rajkot, Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, Agra, Varanasi, and Amritsar, where demand for high-quality pipe fittings is on the rise due to expanding industrial development. Riddhi Siddhi Impex has built strong supply chains and partnerships with contractors, OEMs, and distributors in these cities, ensuring timely delivery and technical support..

Carbon Steel Threaded Coupling

Specifications

Product Name	Carbon Steel Threaded Coupling
Material Grade	ASTM A105, A350 LF2, A182 F304/F316
Standards	ASME B16.11, ASTM A105
Connection Type	Threaded (NPT, BSP)
Pressure Rating	Class 2000, 3000, 6000
Sizes	1/8" to 4"
Type	Full Coupling, Half Coupling

Chemical Composition (ASTM A105)

Element	Composition (%)
Carbon (C)	0.35 max
Manganese (Mn)	0.60 - 1.05
Phosphorus (P)	0.035 max
Sulfur (S)	0.040 max
Silicon (Si)	0.10 - 0.35

Mechanical Properties

Property	Value
Tensile Strength	485 MPa (Min)
Yield Strength	250 MPa (Min)
Elongation	22% (Min)
Hardness	197 HB Max

Dimension Chart (ASME B16.11)

Nominal Pipe Size (NPS)	Length (Full Coupling)	Length (Half Coupling)	Thread Type	Thread Size
1/8"	25 mm	14 mm	NPT / BSP	1/8"
1/4"	29 mm	16 mm	NPT / BSP	1/4"
1/2"	38 mm	23 mm	NPT / BSP	1/2"
3/4"	44 mm	26 mm	NPT / BSP	3/4"
1"	51 mm	31 mm	NPT / BSP	1"
2"	64 mm	44 mm	NPT / BSP	2"
4"	89 mm	65 mm	NPT / BSP	4"

Equivalent Grades

Standard	Equivalent Grade
ASTM	A105, A350 LF2
EN	1.0460
DIN	20MnCr5
JIS	STPG370

Equivalent Standards

Organization	Standard
ASTM	ASTM A105, A350
ASME	ASME B16.11
DIN	DIN 1629, DIN 2605
ISO	ISO 49

Other Types of Threaded Couplings

Type	Description
Full Coupling	Connects two pipes of same diameter in-line
Half Coupling	Connects a pipe to a fitting or valve
Reducing Coupling	Connects pipes of different diameters
Socket Weld Coupling	Pipe inserted in socket and welded externally

In South India, Riddhi Siddhi Impex serves industries across Mysuru, Visakhapatnam, Coimbatore, Madurai, Kochi, Thiruvananthapuram, and Mangalore, providing carbon steel threaded couplings to sectors like shipbuilding, pharmaceuticals, textiles, and manufacturing. Their customer-first approach and adherence to quality standards have earned them a solid reputation among engineers, consultants, and project heads in the region..

Frequently Asked Questions (FAQs)

Q1: What is a Carbon Steel Threaded Coupling used for?

A1: It is used to connect two threaded pipes securely for fluid flow in piping systems.

Q2: What standards does Riddhi Siddhi Impex follow for manufacturing?

A2: We follow ASTM A105, ASME B16.11, and other relevant international standards ensuring quality and reliability.

Q3: Do you supply to all major Indian cities?

A3: Yes, we supply to domestic cities including Mumbai, Delhi, Bengaluru, Chennai, Pune, Ahmedabad, Surat, Vadodara, Rajkot, and many more.

Q4: Can custom sizes and pressure classes be manufactured?

A4: Yes, custom dimensions and pressure ratings are available on request to meet specific project requirements.