Seamless Stainless Steel Tubing

Seamless Tubing You Can Trust

As a leading seamless stainless steel tubing manufacturer, Plymouth^® produces high-quality stainless seamless tubing engineered for consistency, corrosion resistance, and performance in critical applications. With more than 75 years’ experience manufacturing seamless tubing at three of our production mills, we support customers worldwide with tubing built to exact specifications and delivered on time.

Our expertise has made us one of North America’s most established seamless stainless steel tubing suppliers, serving industries that demand tight tolerances and dependable lead times. From instrumentation and heat exchanger tubing to aerospace and nuclear grades, our stainless seamless tubing is designed to perform in the most demanding environments.

Seamless Tubing You Can Trust

Custom-Engineered for Premium Performance

Unlike other seamless tube manufacturers, Plymouth^® combines metallurgical expertise with precision manufacturing to deliver stainless seamless tubing tailored for performance in corrosive, high-pressure, and high-temperature environments. Plymouth^® seamless stainless steel tubing is manufactured to meet rigorous industry specifications and application-specific requirements to help engineers and procurement teams reduce risk, improve uptime, and maintain compliance. Key advantages of our seamless stainless steel tubing include:

Precision manufacturing: The small-diameter and tight-tolerances of our seamless steel tubing is highly valued in aerospace, nuclear, and instrumentation applications.
Custom-built solutions: Our tubing is produced to your exact OD, wall, length, and finishing requirements.
Proven quality systems: We use manufacturing and testing protocols that support regulated and safety-critical markets.

Seamless Stainless Steel Tubing Specifications

Pressure Tubing

ASTM A/B and ASME SA/SB Specifications	Grades	OD Range	Wall Range	Maximum Length
-213 Seamless Austenitic Alloy Steel Boiler, Superheater and Heat Exchanger Tubing	04/L, 316/L, 317/L, 347, others	0.250” – 1.000” 6.35mm – 25.4mm	0.016” – 0.100” 0.4064mm – 2.54mm	130’ 39.63m
-269 Seamless Austenitic Stainless Steel General Service Tubing	304/L, 316/L, 317/L, 347	0.125” – 1.500” 3.175mm – 38.1mm	0.016” – 0.120” 0.4064mm – 3.048mm	48’ – 130’ 14.63m – 39.63m
-270 Seamless Austenitic Stainless Steel Tubing	304/L, 316/L, AL-6XN^®	0.125” – 1.250” 3.175mm – 38.1mm	0.016” – 0.120” 0.4064mm – 3.048mm	48’ – 130’ 14.63m – 39.63m
-632 Seamless Austenitic Stainless Steel Tubing for General Service	304/L/N, 316/L/N, 321, 347	0.125” – 1.500” 3.175mm – 12.7mm	0.016” – 0.065” 0.4064mm – 1.651mm	130’ 39.63m

Commercial Instrumentation Tubing

ASTM A/B and ASME SA/SB Specifications	Grades	OD Range	Wall Range	Maximum Length
-213 Seamless Austenitic Alloy Steel Boiler, Superheater and Heat Exchanger Tubing	304/L, 316/L	0.125” – 1.500” 3.175mm – 38.1mm	0.016” – 0.120” 0.4064mm – 3.048mm	48’ – 130’ 14.63m – 39.63m
-269 Seamless Austenitic Stainless Steel General Service Tubing	304/L, 316/L	0.125” – 1.00” 3.175mm – 25.4mm	0.016” – 0.120” 0.4064mm – 3.048mm	48’ – 130’ 14.63m – 39.63m

ASTM A/B and ASME SA/SB Specifications

Grades

OD Range

Wall Range

Maximum Length

-213 Seamless Austenitic Alloy Steel Boiler, Superheater and Heat Exchanger Tubing

304/L, 316/L

0.125” – 1.500”

3.175mm – 38.1mm

0.016” – 0.120”

0.4064mm – 3.048mm

48’ – 130’

14.63m – 39.63m

-269 Seamless Austenitic Stainless Steel General Service Tubing

304/L, 316/L

0.125” – 1.00”

3.175mm – 25.4mm

0.016” – 0.120”

0.4064mm – 3.048mm

48’ – 130’

14.63m – 39.63m

Nuclear Instrumentation Tubing

ASTM A/B and ASME SA/SB Specifications	Grades	OD Range	Wall Range	Maximum Length
-213 ASME Section III – Class 1, 2, & 3	304/L, 316/L	0.125” – 1.500” ‘3.175mm – 38.1mm	0.016” – 0.120” 0.4064mm – 3.048mm	130’42.67m

ASTM A/B and ASME SA/SB Specifications

Grades

OD Range

Wall Range

Maximum Length

-213 ASME Section III – Class 1, 2, & 3

304/L, 316/L

0.125” – 1.500”

‘3.175mm – 38.1mm

0.016” – 0.120”

0.4064mm – 3.048mm

130’42.67m

Seamless Aerospace Tubing Specifications

Aircraft Specifications	Grades	OD Range	Wall Range	Maximum Length
AMS 5564, AMS 5565, AMS 5567, AMS 5569, MIL-T-5695	304/L	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5573, AMS 5584 1/8 hard	316/L	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557, AMS 5570, AMS 5896, AMS 5897	321	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5557	347	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m
AMS 5581	625	0.125” – 3.000” 3.175mm – 76.2mm	0.016” – 0.218” 0.4064mm – 5.54mm	48ft – 60ft 14.63m – 18.29m

Mechanical Properties

Tensile Strength	515 MPa minimum / 75,000 psi minimum
Yield Strength	205 MPa minimum / 30,000 psi minimum
Total Elongation Under Load	30.000%
Hardness	22 Maximum HRC

Alloys

Austenitic: 304/L/N, 316/L/N, 317/L, 321, 347
Duplex/Lean Duplex: 2101, 2205, 2507
Nickel Alloy: 600, 625, 800, 825

Industrial Applications

Aerospace Tubing

Plymouth^® is a trusted seamless tube manufacturer and partner within the aerospace industry, serving aerospace applications that require dimensional consistency, traceability, and compliance with SAE International aerospace standards. The specifications for each grade of seamless stainless steel aerospace tubing are available in our aerospace tubing sell sheet.

Instrumentation

Our stainless seamless tubing supports instrumentation systems where cleanliness, corrosion resistance, and dimensional precision are critical.

Space Propulsion

The exceptional engineering knowledge that goes into our seamless steel tubing ensures it meets the requisite safety standards and performance requirements for manufacturing space propulsion components and systems.

Markets for Stainless Seamless Tubing

Aerospace

Stainless seamless aerospace tubing is manufactured at our Salisbury Mill to meet aircraft industry specifications and precision engineered for a variety of aerospace components:

Wing mounts
Vertical stabilizer spars
Engine pylons Floor beams
Airframe and structural components

Defense

As an ITAR-compliant manufacturer, Plymouth^® provides high-volume production of seamless stainless steel tubing that meets the most rigorous MIL-SPEC and AMS standards. Our strategic global footprint ensures domestic security and absolute consistency for large-scale military contracts, including:

Naval infrastructure
Tactical aerospace
Strategic platforms
Propulsion and fluid systems

Firearms

Plymouth^® uses seamless stainless steel tubing to manufacture machine-ready profiles used to streamline the manufacture of various firearm components:

Magazine tubes
Receivers
Barrels
Bolt actions
Slides

Life Sciences

Plymouth^® advances medical innovation by delivering high-precision seamless stainless steel tubing for critical healthcare applications. We specialize in high-volume production that adheres to strict ASTM and ASME standards, providing the ultra-clean surfaces and dimensional accuracy required for global life science initiatives, including:

Medical instrumentation
High-purity fluid delivery
Analytical diagnostic systems
Pharmaceutical infrastructure

Chemical Processing

Corrosion resistance is of the utmost importance for chemical processing facilities, which is why our stainless seamless tubing is used throughout the industry. The quality of our tubing is verified through non-destructive testing and is often used for heat exchangers operating in harsh conditions. Some of these applications include:

High-pressure reactor systems
Instrumentation and sensor systems
Sampling systems

Nuclear Power

Plymouth^® delivers the metallurgical certainty required for the next generation of Small Modular Reactors (SMRs) and traditional plant infrastructure. Our seamless stainless tubing is engineered for uninterrupted performance under the combined stresses of high-cycles and extreme thermal pressure, ensuring strict adherence to ASME Section III – Class 1, 2, and 3 standards. The nuclear power applications of our seamless stainless tubing include:

SMR instrumentation and control lines
Steam generator and heat exchanger components
Control rod drive mechanism
Coolant and safety injection systems

Automotive

Engineered for safety-critical environments, Plymouth^® seamless tubing offers the durability and fatigue resistance essential for modern vehicle platforms. Our ISO-certified manufacturing facilities scale to meet Tier 1 production demands, ensuring supply chain agility and high-performance material integrity for:

High-pressure fuel systems
Safety-critical hydraulics
Performance and racing hardware
Advanced powertrain systems

Space

Fatigue resistance and tight dimensional tolerances are essential for space propulsion and infrastructure. Plymouth^® seamless stainless tubing is engineered to maintain mechanical integrity in demanding environments, providing the reliability required for mission-critical flight and ground systems. Some of these applications include:

Rocket and propulsion components
Pressurization systems
Launchpad and ground-support infrastructure
High-pressure fluid transfer systems
Supply and air distribution lines
Propellant feed lines

Downloads & Resources

File	Language	Size
Aerospace Tubing Sell Sheet	EN	989 KB
Plymouth Heat Exchanger Tubing	EN	419 KB
Selecting Tubing Materials for Power Generation Heat Exchangers	EN	265 KB
Plymouth^® Product Catalog	EN	4 MB

Seamless Tubing You Can Trust

Seamless Tubing You Can Trust

Custom-Engineered for Premium Performance

Seamless Stainless Steel Tubing Specifications

Pressure Tubing

Commercial Instrumentation Tubing

Nuclear Instrumentation Tubing

Seamless Aerospace Tubing Specifications

Mechanical Properties

Alloys

Industrial Applications

Markets for Stainless Seamless Tubing

Downloads & Resources

More than 100 Years of Innovation, Quality, and Custom Solutions