Unifit Metalloys is a trusted manufacturer, supplier and exporter of carbon steel tube plugs in India serving the industrial, petrochemical, power and marine sectors. We specialize in ASTM and ASME standard carbon steel tube plugs, designed for reliable, leak-proof sealing in boilers, heat exchangers, condensers and coolers.
Our product range includes ASTM A105, ASTM A350 LF2, ASME SA 179, ASME SA 106 and ASME SA 210 tube plugs engineered to meet specific temperature, pressure and operational requirements. ASTM A105 plugs are ideal for standard applications, ASTM A350 LF2 plugs suit low-temperature and cryogenic conditions, ASME SA 179 plugs are seamless low-carbon steel plugs for thin-walled heat exchanger tubes, ASME SA 106 plugs are high-temperature plugs for boilers and high-pressure piping and ASME SA 210 plugs are medium-carbon steel plugs for superheaters and industrial heat exchangers.
Carbon steel, an alloy of iron and carbon, forms the basis of our tube plugs. The carbon content directly influences strength, hardness, ductility and temperature resistance, higher carbon increases hardness but reduces weldability while lower carbon improves melting point and temperature tolerance. Choosing the right grade ensures safety, efficiency and durability in demanding industrial applications.
Request QuoteWhat Are Carbon Steel Tube Plugs?
Carbon steel tube plugs are industrial components designed to seal the ends of metal tubes, preventing leakage of fluids or gases in systems like heat exchangers, boilers, condensers and cooling equipment. They are made from carbon steel, a durable alloy of iron and carbon, which provides strength, hardness, and resistance to temperature and pressure.
These plugs come in different design types such as tapered, threaded, shoulder, or two-piece plugs, each suited to a specific sealing requirement. The tapered design creates a tight, mechanical seal while threaded or two-piece designs allow for easy installation and removal.
Carbon Steel Tube Plug Specification
Carbon steel tube plugs specifications including diameter, length, pressure rating and material grade are critical to ensure reliable performance, leak-proof sealing and operational safety in industrial applications. Manufactured in compliance with ASTM and ASME standards, these plugs are available in multiple grades to suit temperature, pressure and operational requirements providing engineers and buyers with consistent quality and dependable performance.
| Standards / Grades | Diameter (OD) | Length | Maximum Pressure |
|---|---|---|---|
| ASTM A105, ASTM A350 LF2, ASME SA 179, ASME SA 106 & ASME SA 210 | ¼″ up to 4″ | Max 6 in (152.4 mm) | 150 PSI |
Grades for Carbon Steel Tapered Plugs
Carbon steel tapered plugs are specialized components that provide a secure and precise closure for tubes in industrial systems. Unlike standard fittings, these plugs are engineered to withstand thermal expansion, high pressure and mechanical stress, ensuring the integrity of boilers, heat exchangers, condensers and other tubular equipment. Their precision design allows for easy installation, reliable sealing and minimal maintenance making them essential for industries where safety, efficiency and longevity are critical. Selecting the appropriate grade ensures optimal performance under specific operational conditions.
ASTM A105 Tube Plugs
ASTM A105 plugs are made from standard carbon steel and are ideal for general temperature and pressure applications. They offer excellent mechanical strength, machinability and weldability making them suitable for medium-pressure boilers and heat exchangers. These plugs provide a cost-effective solution for industrial applications where reliable sealing and durability are required.
ASTM A350 LF2 Tube Plugs
ASTM A350 LF2 plugs are designed for low-temperature and cryogenic environments offering superior toughness, ductility and impact resistance. They maintain structural integrity under extreme cold and rapid temperature fluctuations making them perfect for refrigeration systems, chilled water units and cryogenic heat exchangers.
ASME SA 179 Tube Plugs
ASME SA 179 plugs are made from seamless low-carbon steel and are intended for thin-walled heat exchanger and condenser tubes. Their design ensures precise sealing with minimal thermal expansion reducing the risk of leaks and enhancing system reliability in high-temperature cooling applications.
ASME SA 106 Tube Plugs
ASME SA 106 plugs are high-temperature carbon steel plugs suitable for boilers, superheaters and high-pressure piping. They offer excellent tensile strength, hardness and thermal stress resistance making them ideal for power plants and heavy industrial equipment where consistent performance at elevated temperatures is critical.
ASME SA 210 Tube Plugs
ASME SA 210 plugs are made from medium-carbon steel and are engineered for superheaters, boilers and industrial heat exchangers. These plugs balance hardness, ductility and temperature resistance ensuring long-lasting performance and minimal maintenance in demanding industrial environments.
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Types of Carbon Steel Tube Plug
Unifit Metalloys offers a wide range of carbon steel tube plugs across all major grades, including ASTM A105, ASTM A350 LF2, ASME SA 179, ASME SA 106 and ASME SA 210. Each grade features multiple plug types to meet diverse industrial requirements, ensuring reliable sealing solutions for boilers, heat exchangers, condensers, and other tubular systems. The following table provides a clear overview of the available types for easy reference:
| Tube Plug Types |
|
|---|---|
| ASTM A105 Tapered Tube Plug, ASTM A105 Threaded Tapered Plug, ASTM A105 Two-Piece Tube Plug, ASTM A105 Shoulder Tube Plug | |
| ASTM A350 LF2 Tapered Tube Plug, ASTM A350 LF2 Threaded Tube Plug, ASTM A350 LF2 Two-Piece Tube Plug, ASTM A350 LF2 Shoulder Tube Plug | |
| ASME SA 179 Expandable Tube Plug, ASME SA 179 Boiler Tapered Tube Plug, ASME SA 179 Threaded Tapered Tube Plug, ASME SA 179 One-Piece Tube Plug, ASME SA 179 Metal / CS Tapered Tube Plug, ASME SA 179 Heat Exchanger Tube Plug, ASME SA 179 Pin Tube Plug, ASME SA 179 Collar Tube Plug, ASME SA 179 Condenser Tube Plug | |
| ASME SA 106 Tapered Tube Plug, ASME SA 106 Threaded Tapered Plug, ASME SA 106 Two-Piece Tube Plug, ASME SA 106 Shoulder Tube Plug | |
| ASME SA 210 Tapered Tube Plug, ASME SA 210 Two-Piece Tube Plug, ASME SA 210 Shoulder Tube Plug |
Carbon Steel Tapered Plugs Equivalent Materials
Each grade of carbon steel tapered plug has equivalent materials that can be used depending on availability, application requirements or regional standards. Below are the equivalents for each grade:
|
Grade / Standard |
Equivalent Materials |
|---|---|
|
ASTM A105 |
DIN 17175 C22, EN 10216-2 P235GH, JIS STPG 370 |
|
ASTM A350 LF2 |
DIN 17155 1.7357, EN 10222-2 L2, JIS SMn2 |
|
ASME SA 179 |
DIN 17175 St 35.8, EN 10216-2 P235TR1, JIS STBA 26 |
|
ASME SA 106 |
DIN 17175 St 35.8I, EN 10216-2 P265GH, JIS STPG 370 |
|
ASME SA 210 |
DIN 17175 C22.8, EN 10216-2 P235GH, JIS STPG 370 |
Chemical Composition of Carbon Steel Tube Plug
The chemical composition of carbon steel used in tapered tube plugs plays a critical role in determining strength, hardness, ductility and temperature resistance. Carbon steel is an alloy of iron and carbon and the precise percentage of carbon and other alloying elements varies based on the grade ensuring the plug performs optimally under specific industrial conditions.
|
Grade / Standard |
Carbon (C) |
Manganese (Mn) |
Sulfur (S) |
Phosphorus (P) |
|---|---|---|---|---|
|
ASTM A105 |
Max 0.35% |
0.60–1.05% |
Max 0.035% |
Max 0.035% |
|
ASTM A350 LF2 |
Max 0.20% |
Max 1.00% |
Max 0.035% |
Max 0.035% |
|
ASME SA 179 |
Max 0.30% |
0.27–0.63% |
Max 0.035% |
Max 0.035% |
|
ASME SA 106 |
0.30–0.35% |
0.60–1.05% |
Max 0.035% |
Max 0.035% |
|
ASME SA 210 |
Max 0.30% |
0.60–1.05% |
Max 0.035% |
Max 0.035% |
Mechanical Properties of Carbon Steel Tapered Tube Plugs
The mechanical properties of carbon steel tapered plugs define how the plugs respond to pressure, temperature fluctuations and mechanical stress in boilers, heat exchangers, condensers and cooling equipment. Key mechanical characteristics include tensile strength, yield strength, elongation and hardness which vary according to the steel grade and its intended application.
|
Grade / Standard |
Tensile Strength |
Yield Strength |
Elongation (%) |
Hardness (HB) |
|---|---|---|---|---|
|
ASTM A105 |
Min 60 ksi |
Moderate |
20–25% |
170–210 |
|
ASTM A350 LF2 |
60–80 ksi |
Moderate |
~22% |
170–200 |
|
ASME SA 179 |
55–65 ksi |
Moderate |
20% |
160–200 |
|
ASME SA 106 |
60–80 ksi |
35–50 ksi |
~20% |
170–220 |
|
ASME SA 210 |
55–70 ksi |
30–45 ksi |
18–22% |
165–210 |
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Dimensions for Carbon Steel Tapered Tube Plugs
Unifit Metalloys provides carbon steel tapered tube plugs in an extensive range of standard dimensions, designed to fit tubes with outer diameters (OD) from ¼″ to 4″. Engineered with precision, these plugs ensure a tight, reliable seal, and can also be custom-fabricated to suit specific project requirements. Ideal for use in boilers, heat exchangers, condensers, and cooling systems, they deliver consistent performance where accurate sizing and long-term durability are essential.
Carbon Steel Tapered Plugs – Tube Plug Sizing Chart
Tube OD |
Gauge |
Small End “A” |
Large End “B” |
Length “L” |
|---|---|---|---|---|
1/4″ |
18–24 |
0.141″ |
0.235″ |
1-1/4″ |
3/8″ |
12–24 |
0.213″ |
0.371″ |
1-3/4″ |
1/2″ |
13–24 |
0.337″ |
0.495″ |
|
5/8″ |
12–24 |
0.449″ |
0.625″ |
|
3/4″ |
10–24 |
0.564″ |
0.750″ |
|
7/8″ |
10–24 |
0.706″ |
0.875″ |
|
1″ |
8–24 |
0.776″ – 0.892″ |
0.934″ – 1.050″ |
2″ |
1-1/8″ |
13–24 |
0.949″ |
1.125″ |
|
1-1/4″ |
10–24 |
1.010″ – 1.147″ |
1.186″ – 1.323″ |
|
1-1/2″ |
10–24 |
1.200″ – 1.305″ |
1.495″ – 1.600″ |
3″ |
1-3/4″ |
6–22 |
1.575″ |
1.870″ |
|
2″ |
6–22 |
1.700″ |
1.995″ |
|
2-1/4″ |
6–13 |
1.805″ |
2.100″ |
|
2-1/2″ |
5–18 |
2.000″ |
2.375″ |
|
2-3/4″ |
4–10 |
2.232″ |
2.500″ |
|
3″ |
5–23 |
2.524″ – 2.625″ |
2.834″ – 3.000″ |
4″ |
3-1/4″ |
7–23 |
2.875″ – 3.010″ |
3.125″ – 3.250″ |
|
3-1/2″ |
7–23 |
3.125″ – 3.260″ |
3.375″ – 3.500″ |
|
3-3/4″ |
5–23 |
3.274″ – 3.510″ |
3.567″ – 3.750″ |
|
4″ |
5–23 |
3.524″ – 3.782″ |
3.817″ – 4.000″ |
Carbon Steel Tube Plugs Price in India
Unifit Metalloys offers high-quality carbon steel tube plugs at competitive prices in India, catering to the needs of industrial, petrochemical, power, and marine sectors. The price of a tube plug depends on factors such as grade, size, type (tapered, threaded, two-piece, shoulder) and customization requirements.
We provide both standard sizes for immediate requirements and customized plugs tailored to specific operational conditions ensuring that clients get the right solution without compromising on quality. Our transparent pricing and bulk order options make it easy for procurement teams and engineers to plan budgets effectively.
|
Grade / Standard |
Approx. Price Range (INR / Piece) |
|---|---|
|
ASTM A105 |
|
|
ASTM A350 LF2 |
|
|
ASME SA 179 |
|
|
ASME SA 106 |
|
|
ASME SA 210 |
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