ASTM A519 Seamless Mechanical Tubing Manufacturer & Supplier

USA Piping Solution is a leading national provider of ASTM A519 Seamless Mechanical Tubing. This specification represents a cornerstone for engineers and fabricators needing high-quality seamless carbon and alloy steel tubing for mechanical applications. We understand the importance of reliable materials, which is why we maintain a deep inventory of A519 tubing across the United States. When your project demands certified ASTM A519 Seamless Mechanical Tubing delivered promptly and backed by solid expertise, count on USA Piping Solution.

What is ASTM A519 Seamless Mechanical Tubing?

At its core, ASTM A519 Seamless Mechanical Tubing defines seamless tubing made from various carbon and alloy steels, specifically intended for mechanical uses. This sets it apart from pipe specifications like ASTM A106 or A53, which prioritize pressure handling. With A519, the focus shifts towards factors critical for manufacturing components: dimensional precision, specific strength or hardness levels, good machinability, and consistent surface quality.

The standard itself is quite comprehensive, covering numerous steel grades. This gives designers tremendous latitude to choose a material with the right blend of strength, heat treatability, and cost for their specific part. Whether you need a basic low-carbon steel like 1020 or 1026, or a high-strength alloy like 4130 or 4140, the A519 specification provides the framework.

Crucially, all tubing under this standard is produced seamlessly. The process starts with a solid steel billet which is then pierced and worked – either hot or cold – into its final tubular shape. This lack of a weld seam results in uniform material properties around the circumference, a desirable characteristic for many stressed mechanical parts.

You'll find ASTM A519 Mechanical Tubing specified whenever the end product demands tight tolerances, a particular surface finish for subsequent operations (like honing or plating), or definite mechanical capabilities achieved through careful grade selection and potential heat treatment. It’s the go-to standard for high-performance seamless tubing in non-pressure applications.

ASTM A519 Tubing Specifications

Navigating the specifics of ASTM A519 is key to ensuring the tubing selected will perform correctly in your mechanical design. USA Piping Solution supplies materials that strictly conform to these established requirements.

Key Technical Parameters

Category	Details
Governing Standard	ASTM A519 (with ASME SA519 potentially referenced for certain grades/applications)
Production Method	Exclusively Seamless
Finishing Options	Hot-Finished (HF): Shaped and completed at high temperatures Cold-Finished (CF) / Cold-Worked (CW) / Cold Drawn: Sized near room temperature via drawing Other Finishes: Rough Turned (RT) or Ground (G) can be specified
Size Capabilities (OD)	Up to 12.75 inches (323.8 mm); practical availability varies by finish and grade
Wall Thickness	Defined by OD and wall thickness or OD/ID; tolerances depend on finish and wall specification (average vs. minimum)
Available Shapes	Round: Predominant form Square & Rectangular: Common sizes available Special Sections: Custom profiles possible upon consultation
Thermal Condition (Optional but Common)	As-Finished: No heat treatment after final sizing Annealed (A): Fully softened for formability Normalized (N): Improves grain structure and consistency Stress Relieved (SR) / Finish Annealed: Reduces residual stresses Quenched and Tempered (QT): High strength/toughness for alloy steels

Chemical Composition and Mechanical Properties

The specific performance of ASTM A519 Seamless Mechanical Tubing – its strength, how easily it machines, its response to heat treating – is dictated by the steel grade's chemistry and the resulting mechanical characteristics. A519 offers a broad palette of materials.

Representative Chemical Compositions (% by Weight)

ASTM A519 includes a vast number of standard carbon and alloy grades. Below are just a few frequently requested examples:

Grade	Carbon (C)	Manganese (Mn)	Phosphorus (P) max	Sulfur (S) max	Silicon (Si)	Chromium (Cr)	Molybdenum (Mo)
1010	0.08 - 0.13	0.30 - 0.60	0.040	0.050	--	--	--
1020	0.18 - 0.23	0.30 - 0.60	0.040	0.050	--	--	--
1026	0.22 - 0.28	0.60 - 0.90	0.040	0.050	--	--	--
4130	0.28 - 0.33	0.40 - 0.60	0.040	0.040	0.15 - 0.35	0.80 - 1.10	0.15 - 0.25
4140	0.38 - 0.43	0.75 - 1.00	0.040	0.040	0.15 - 0.35	0.80 - 1.10	0.15 - 0.25

Note: This table shows only a small fraction of the available A519 grades. The full standard details many others, including free-machining grades (like 11xx, 12xx series) and various alloy families (like 86xx). Always refer to the standard for precise chemical ranges.

Understanding Mechanical Properties

A key point about ASTM A519 Mechanical Tubing is that unlike pressure pipe, minimum yield and tensile strengths aren't typically guaranteed for the basic as-finished conditions (HF or CF). The properties achieved depend heavily on the grade, the amount of cold work (for CF), and any subsequent heat treatment.

• Hot-Finished (HF): Generally offers lower strength and hardness but better ductility compared to cold-finished material of the same grade. Tolerances are wider.
• Cold-Finished (CF/CDW): Cold working significantly increases strength and hardness through strain hardening, but ductility decreases. Provides much tighter dimensional control and a smoother surface.
• Thermal Treatments: These are used to modify properties. Annealing softens, normalizing improves uniformity, stress relieving reduces residual stress from cold work, and Quenching & Tempering (QT) develops high strength and hardness, especially in A519 Alloy Steel Tubing like 4140.

Illustrative Property Expectations (Highly Variable):

Property	Example Grade	Condition	Potential Range	Comments
Tensile Strength	1026	Hot Finished	~60 - 80 ksi (415 - 550 MPa)	Influenced by mill finishing parameters
Tensile Strength	1026	Cold Drawn (SR)	~75 - 100 ksi (515 - 690 MPa)	Increases with cold work; SR modifies slightly
Yield Strength	1026	Hot Finished	~40 - 60 ksi (275 - 415 MPa)	Often less critical than for CF
Yield Strength	1026	Cold Drawn (SR)	~60 - 85 ksi (415 - 585 MPa)	Significantly raised by cold work
Hardness (Brinell)	1026	Hot Finished	~120 - 160 HBW	Relatively soft
Hardness (Brinell)	1026	Cold Drawn (SR)	~150 - 200 HBW	Hardened by cold work
Tensile Strength	4140	Quench & Temper	125ksi+ (860 MPa+)	Target strength achieved via tempering temp.
Hardness (Rockwell C)	4140	Quench & Temper	25 HRC+	Tailored hardness through heat treatment

Because properties are condition-dependent, specifying the required Grade, Finish (HF/CF), and any necessary Thermal Treatment (A, N, SR, QT) is essential when ordering A519 tubing to meet specific performance targets. Mechanical testing can be specified if verification is needed.

Hot-Finished vs. Cold-Finished: Understanding the Difference

Aspect	Hot-Finished (HF) Seamless Tubing	Cold-Finished (CF/CW) Seamless Tubing
Process	Shaped and sized at high temperatures (above recrystallization point)	Started from HF tube; reduced and finished at room temperature by drawing through dies (possibly over mandrels)
Surface Finish	Rougher texture with mill scale; typical of hot-rolled products	Smoother, cleaner, and brighter surface
Dimensional Tolerances	Less precise OD/ID/wall tolerances	Tight and consistent tolerances on OD, ID, and wall thickness
Mechanical Properties	Lower strength/hardness, higher ductility	Higher tensile/yield strength and hardness; reduced ductility
Uniformity	Greater variability in properties	Improved uniformity due to cold work
Cost	More cost-effective (fewer manufacturing steps)	More expensive due to added processing
Common Uses	When surface finish or precise dimensions aren't critical Suitable for parts that will be machined Starting material for cold-finished tubes	When tight tolerances and clean surfaces are essential Used in hydraulic cylinders, precision parts, plating applications

The selection between HF and CF ASTM A519 Seamless Mechanical Tubing hinges on the specific engineering requirements for tolerances, surface condition, mechanical strength, and overall project budget.

Key Applications and Industries Served

The adaptability of ASTM A519 Seamless Mechanical Tubing, stemming from its wide grade selection and finishing options, makes it a vital component in numerous industrial fields:

• Hydraulic Cylinders: Especially Cold Drawn Seamless (CDS) grades like 1020, 1026, or ST52.3 are extensively used for cylinder barrels. The smooth ID finish and tight tolerances are ideal for sealing applications.
• Automotive Manufacturing: Critical for producing robust components like axles, steering columns, suspension arms, drive shafts, and structural elements demanding reliable strength. Alloy grades (4130, 4140, 8620) are frequently employed.
• Industrial Machinery: Forms the basis for countless parts such as rollers, shafts, bearing housings, conveyor parts, and structural frames where precise dimensions and dependable strength are necessary.
• Agricultural Machinery: Used in the construction of durable components for tractors, harvesters, and various implements, including hydraulic parts and structural framing.
• Heavy Construction Equipment: Found in the booms, hydraulic systems, pins, and structural elements of equipment like cranes, excavators, and bulldozers that experience high stress.
• Energy Sector Equipment: Utilized in making components for drilling tools, downhole equipment, and surface machinery where mechanical integrity is paramount.
• General Machining and Fabrication: Serves as versatile stock material for creating custom bushings, spacers, structural connectors, and a wide variety of precision-machined parts.

The ability to specify grade, finish, and heat treatment allows ASTM A519 Mechanical Tubing to be optimized for performance across this broad spectrum of uses.

ASTM A519 Tubing Size Chart and Weight Chart

Accurate dimensional and weight data facilitate design, logistics, and inventory control. This chart offers nominal dimensions and calculated weights for representative round ASTM A519 Seamless Mechanical Tubing sizes. Note that weights are theoretical.

OD (in)	Wall Thk (in)	ID (in)	Weight (lbs/ft)	Weight ( kg/m )	Comments
1.000	0.120	0.760	1.13	1.68
1.000	0.188	0.624	1.68	2.50
1.500	0.120	1.260	1.77	2.63
1.500	0.250	1.000	3.48	5.18
2.000	0.120	1.760	2.41	3.59
2.000	0.250	1.500	4.78	7.11
2.000	0.375	1.250	6.81	10.13
2.500	0.188	2.124	4.58	6.82
2.500	0.375	1.750	8.63	12.84
3.000	0.250	2.500	7.22	10.74
3.000	0.500	2.000	13.63	20.28
4.000	0.250	3.500	9.83	14.63
4.000	0.500	3.000	18.58	27.65
5.000	0.375	4.250	18.11	26.95
5.000	0.750	3.500	34.37	51.15
6.000	0.500	5.000	28.57	42.52
6.000	1.000	4.000	53.15	79.10
8.000	0.500	7.000	38.55	57.37
8.000	1.000	6.000	73.12	108.82
10.000	0.750	8.500	72.18	107.41
10.000	1.250	7.500	115.19	171.43
12.000	1.000	10.000	113.09	168.30
12.000	1.500	9.000	163.60	243.47

Disclaimer: This table is illustrative. Actual weights depend on precise dimensions within tolerance ranges. For critical calculations, consult detailed standards or use verified weight calculators.

Ensuring Quality through Certification and Compliance

Verification that ASTM A519 Seamless Mechanical Tubing meets the intended standard is fundamental for its proper application. USA Piping Solution ensures materials are supplied with appropriate documentation confirming compliance.

• ASTM A519 Standard Conformance: All tubing provided is certified by the manufacturer to meet the requirements of ASTM A519 for the specified grade, finish, and condition. This includes chemical composition, seamless manufacturing, dimensional tolerances, and applicable thermal treatments.
• Documentation (MTRs / CoCs): Mill Test Reports (MTRs) detailing actual chemistry and mechanical test results (when tests are required and performed based on the order conditions) can be supplied. Certificates of Conformance (CoC) affirming compliance with the ASTM A519 standard are generally available.
• ISO 9001 Quality Standards: Our internal quality management system is certified to ISO 9001, ensuring consistent processes for sourcing, inspection, documentation, and supply.
• Product Identification: Tubing is marked according to industry practice and standard requirements, typically including:
• Manufacturer's mark
• ASTM A519 designation
• Grade identifier (e.g., 1026, 4130)
• Dimensions (OD, Wall)
• Heat code or Lot ID for traceability
• Finish/Condition code (HF, CD, N, QT, etc.) where applicable.

This focus on documentation provides traceability and confirms the tubing meets the necessary specifications for mechanical end-use.

Why USA Piping Solution Excels in Supplying ASTM A519 Tubing

Choosing the right supplier for mechanical tubing impacts project timelines and component quality. USA Piping Solution offers compelling advantages for your ASTM A519 Seamless Mechanical Tubing needs:

• In-Depth Product Knowledge: Our team has a strong understanding of the A519 standard, including the various grades, finishes, and heat treatment options, allowing us to assist you effectively.
• Broad US Inventory: We stock an extensive range of A519 seamless tubing in popular carbon and alloy grades, sizes, and finishes across our US locations, ensuring quick access to materials.
• Reliable Logistics: Our distribution capabilities are geared towards timely and dependable delivery nationwide, helping you meet demanding production schedules.
• Strategic Sourcing: Through strong mill partnerships, we provide competitively priced, high-quality mechanical tubing.
• Quality Verification: We maintain rigorous quality procedures, including careful review of mill documentation (MTRs/CoCs), to ensure materials meet specified standards.
• Processing Capabilities: We offer and manage various value-added services, including saw cutting, deburring, chamfering, and coordination of further processing needs.
• Customer-Focused Service: Our sales and support staff are dedicated to providing prompt, accurate information and efficient order processing.

Related Industrial Pipe and Tube Selections

Beyond mechanical tubing, USA Piping Solution provides a wide range of tubular products for pressure and specialized applications:

Recognizing the distinctions between mechanical tubing standards like A519 and pressure pipe specifications is essential for appropriate material selection. We can provide guidance in this area.

Fulfill Your ASTM A519 Seamless Mechanical Tubing Requirements

For mechanical applications demanding precision, specific properties, and the integrity of seamless construction, choose ASTM A519 Seamless Mechanical Tubing from USA Piping Solution. We offer a comprehensive selection of certified carbon and alloy grades, backed by substantial domestic inventory and dedicated customer support. Partner with us for reliable sourcing of your essential mechanical tubing needs.

Please contact USA Piping Solution to detail your ASTM A519 Seamless Mechanical Tubing requirements and receive a responsive, competitive quotation.

Request Your ASTM A519 Tubing Quotation Now!