Mechanical Tubes are seamless or welded steel tubes engineered for precision steel tubes applications in machinery, automotive, and structural systems. Conforming to standards such as ASTM A519, DIN 2391, and EN 10305-1, these tubes offer exceptional high strength and dimensional accuracy, making them ideal for demanding industrial environments, including construction equipment, automotive components, and heavy machinery.

Manufactured through cold-drawing, hot-rolling, or welding processes, Seamless Mechanical Tubes achieve tight tolerances (H8–H10) and smooth surface finishes (Ra ≤ 0.8 µm), ensuring compatibility with precision components. Available in outer diameters from 6 mm to 406 mm and wall thicknesses from 0.5 mm to 40 mm, they are designed to withstand high mechanical stress and resist pipeline wear. Materials like carbon steel (AISI 1020, 1045), alloy steel (AISI 4140), and stainless steel (304, 316) are selected for their strength and durability, with optional coatings like zinc or phosphate for enhanced corrosion resistance.

Mechanical Tubes address challenges like mechanical stress, fatigue, and dimensional inconsistencies in industrial applications. Their robust construction and versatility make them a preferred choice for engineers seeking reliable industrial tubing solutions for high-performance systems.

Mechanical tubes

Technical Specifications

Mechanical tubes are engineered to meet stringent requirements for industrial applications:

Material: Carbon steel (AISI 1020, 1045), alloy steel (AISI 4130, 4140), stainless steel (304, 316).
Size Range: Outer diameters from 6 mm to 406 mm, wall thicknesses from 0.5 mm to 40 mm, lengths up to 12 meters.
Tolerance Standards: ASTM A519, DIN 2391, EN 10305-1, EN 10305-2.
Surface Roughness: Ra ≤ 0.8 µm for seamless tubes, achieved through cold-drawing or precision finishing.
Surface Treatment: Zinc coating, phosphate coating, or oiled for corrosion resistance.
Pressure Rating: Varies by grade and wall thickness, suitable for high-stress mechanical applications.

These specifications ensure mechanical tubes meet the demands of precision machinery and structural applications, providing durability and reliability.

Key Benefits

High Precision

Tight tolerances (H8–H10) ensure compatibility with precision components.

High Strength

Withstands high mechanical stress and fatigue in demanding applications.

Smooth Surface

Ra ≤ 0.8 µm reduces friction and enhances component compatibility.

Versatility

Available in seamless and welded forms for diverse applications.

Cost-Effective

Durable design reduces maintenance and replacement costs.

Customizable Sizes

Available in various diameters and lengths up to 12 m.

Mechanical Tubes Standard Specifications

Unlike standard pipes, which primarily transport fluids, mechanical tubing is produced to meet specific performance requirements like strength, dimensional accuracy, and surface finish.

ASTM standards for Mechanical tubing
Abbr.	Corresponding	Application
A511	ASTM A511 / A511M	Specification for Seamless Stainless Steel Mechanical Tubing
A512	ASTM A512 / ASME SA512	Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
A513	ASTM A513 / A513M	Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing
A519	ASTM A519 / A519M	Specification for Seamless Carbon and Alloy Steel Mechanical Tubing
A554	ASTM A554	Specification for Welded Stainless Steel Mechanical Tubing

OD and ID Tolerances for Tubing (Inches and Millimeters)
OD Size Range (Inches, Inclusive)	Wall Percent of OD	OD (Inches)		ID (Inches)		Quenched & Tempered OD & ID (± Inches)	OD Size Range (mm, Inclusive)	Wall Percent of OD	OD (mm)		ID (mm)		Quenched & Tempered OD & ID (± mm)
OD Size Range (Inches, Inclusive)	Wall Percent of OD	Over	Under	Over	Under	Quenched & Tempered OD & ID (± Inches)	OD Size Range (mm, Inclusive)	Wall Percent of OD	Over	Under	Over	Under	Quenched & Tempered OD & ID (± mm)
0.500-1.699 1.700-2.099 2.100-2.499	All All All	.005 .006 .007	.000 .000 .000	.000 .000 .000	.005 .006 .007	.015 .020 .023	12.70-43.16 43.17-53.32 53.33-63.48	All All All	0.13 0.15 0.18	0.00 0.00 0.00	0.00 0.00 0.00	0.13 0.15 0.18	0.38 0.51 0.58
2.500-2.899 2.900-3.299 3.300-3.699 3.700-4.099	All All All All	.008 .009 .010 .011	.000 .000 .000 .000	.000 .000 .000 .000	.008 .009 .010 .011	.025 .028 .030 .033	63.49-73.64 73.65-83.80 83.81-93.96 93.97-104.12	All All All All	0.20 0.23 0.25 0.28	0.00 0.00 0.00 0.00	0.00 0.00 0.00 0.00	0.20 0.23 0.25 0.28	0.64 0.71 0.76 0.84
4.100-4.499 4.500-4.899 4.900-5.299 5.300-5.549	All All All All	.012 .013 .014 .015	.000 .000 .000 .000	.000 .000 .000 .000	.012 .013 .014 .015	.036 .038 .041 .044	104.13-114.28 114.29-124.44 124.45-134.60 134.61-140.95	All All All All	0.30 0.33 0.36 0.38	0.00 0.00 0.00 0.00	0.00 0.00 0.00 0.00	0.30 0.33 0.36 0.38	0.91 0.97 1.04 1.12
5.550-5.999	Under 6 6 to 7½ Over 7½	.010 .009 .018	.010 .009 .000	.010 .009 .009	.010 .009 .009	.047 .047 .047	140.96-152.38	Under 6 6 to 7½ Over 7½	0.25 0.23 0.46	0.25 0.23 0.00	0.25 0.23 0.23	0.25 0.23 0.23	1.19 1.19 1.19
6.000-6.499	Under 6 6 to 7½ Over 7½	.013 .010 .020	.013 .010 .000	.013 .010 .010	.013 .010 .010	.050 .050 .050	152.39-165.08	Under 6 6 to 7½ Over 7½	0.33 0.25 0.51	0.33 0.25 0.00	0.33 0.25 0.25	0.33 0.25 0.25	1.27 1.27 1.27
6.500-6.999	Under 6 6 to 7½ Over 7½	.015 .012 .023	.015 .012 .000	.015 .012 .012	.015 .012 .012	.057 .053 .053	165.09-177.78	Under 6 6 to 7½ Over 7½	0.38 0.30 0.58	0.38 0.30 0.00	0.38 0.30 0.30	0.38 0.36 0.30	1.45 1.35 1.35
7.000-7.499	Under 6 6 to 7½ Over 7½	.018 .013 .026	.018 .013 .000	.018 .013 .013	.018 .013 .013	.065 .056 .056	177.79-190.48	Under 6 6 to 7½ Over 7½	0.46 0.33 0.66	0.46 0.33 0.00	0.46 0.33 0.33	0.46 0.33 0.33	1.65 1.42 1.42
7.500-8.000	Under 6 6 to 7½ Over 7½	.020 .015 .030	.020 .015 .000	.020 .015 .015	.020 .015 .015	.070 .060 .060	190.49-203.20	Under 6 6 to 7½ Over 7½	0.51 0.38 0.76	0.51 0.38 0.00	0.51 0.38 0.38	0.51 0.38 0.38	1.78 1.52 1.52

Seamless mechanical tubing is furnished in both cold-drawn and hotfinished form in a wide range of sizes, from 1.375" to 7.750" OD and from 0.188" to 1.625" wall thickness, as shown on the chart to the right.

Wall Thickness Tolerances (Percent of Nominal)
Wall Thickness Percent of OD	Maximum Percent Over & Under Nominal		Wall Thickness Percent of OD	Maximum Percent Over & Under Nominal
Wall Thickness Percent of OD	Under 1.499" ID	1.500" ID & Over	Wall Thickness Percent of OD	Under 38.07mm ID	38.07mm ID & Over
Under 10	10.0	7.5	Under 10	10.0	7.5
10 to 25	10.0	6.0	10 to 25	10.0	6.0
Over 25	12.5	7.5	Over 25	12.5	7.5

Comparison of Honed Tubes with Standard Tubes
Feature	Honed Tubes	Standard Tubes
Material Type	Carbon/Alloy Steel (ST52, E355)	Carbon Steel
Surface Finish	Ra ≤0.4 µm (Honed/SR-B)	Ra ≥1.0 µm
Tolerance	H7–H9	H11 or lower
Tensile Strength (MPa)	515–600	400–500
Applications	Hydraulic/Pneumatic Cylinders	General Piping
Cost	Higher (precision processing)	Lower
Key Advantage	Precision bore, extended seal life	Cost-effective for non-precision uses

Comparison of Mechanical Tubes with Hydraulic Tubes and Structural Tubes
Feature	Mechanical Tubes	Hydraulic Tubes	Structural Tubes
Material Type	Carbon/Alloy/Stainless Steel	Carbon/Stainless Steel	Carbon Steel
Surface Finish	Ra ≤ 0.8 µm	Ra ≤ 0.4 µm	Ra ≥ 1.0 µm
Tolerance	H8–H10	H7–H9	H11 or lower
Tensile Strength (MPa)	420–850	340–630	400–600
Applications	Machinery, Automotive, Structural	Hydraulic/Pneumatic Systems	Construction, Frameworks
Cost	Moderate	Moderate to High	Low to Moderate
Key Advantage	Versatility, precision	High precision, pressure resistance	Cost-effective for structural use

Note: Mechanical tubes offer a balance of precision and strength, making them suitable for both machinery and structural applications, while hydraulic tubes prioritize pressure resistance and surface finish.

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Standards and Specifications

• Mechanical tubes specifications
• ASTM A519 mechanical tubing standards
• DIN 2391 precision steel tubes
• EN 10305-1 seamless mechanical tubes

Applications

• Mechanical tubes for machinery
• Precision steel tubes for automotive
• Structural steel tubes applications
• High-strength tubes for construction

Material and Grades

• AISI 1020 mechanical tubing
• AISI 4140 seamless tubes
• Stainless steel mechanical tubes
• Mechanical tubes chemical composition

Manufacturing and Testing

• Mechanical tubes manufacturing process
• Seamless steel tubes quality testing
• Precision steel tubes tolerances
• High-strength tubes heat treatment

Note: Mechanical tubes meet ASTM A519, DIN 2391, and EN 10305-1 standards, offering precision and strength. Contact suppliers for detailed specifications.

Mechanical tubes are seamless or welded steel tubes designed for precision machinery, automotive, and structural applications, offering high strength and dimensional accuracy.

Common materials include carbon steel (AISI 1020, 1045), alloy steel (AISI 4130, 4140), and stainless steel (304, 316), with optional coatings for corrosion resistance.

- AISI 1020: C 0.18–0.23%, Si 0.15–0.35%, Mn 0.30–0.60%, P ≤0.040%, S ≤0.050%
- AISI 4140: C 0.38–0.43%, Si 0.15–0.35%, Mn 0.75–1.00%, P ≤0.035%, S ≤0.040%, Cr 0.80–1.10%
- 304 Stainless Steel: C ≤0.08%, Si ≤1.00%, Mn ≤2.00%, P ≤0.045%, S ≤0.030%, Cr 18.0–20.0%, Ni 8.0–10.5%

- AISI 1020: Tensile ≥420 MPa, Yield ≥350 MPa, Elongation ≥15%, Hardness 121–156 HB
- AISI 4140: Tensile ≥850 MPa, Yield ≥650 MPa, Elongation ≥14%, Hardness 229–302 HB
- 304 Stainless Steel: Tensile ≥515 MPa, Yield ≥205 MPa, Elongation ≥40%, Hardness ≤201 HB

Outer diameters from 6 mm to 406 mm, wall thicknesses from 0.5 mm to 40 mm, lengths up to 12 meters, customizable per requirements.

Cold-drawing, hot-rolling, or welding, followed by heat treatment, surface coating, and nondestructive testing (ultrasonic, eddy current).

Ultrasonic testing, eddy current testing, tensile testing, dimensional checks, and surface inspections to ensure quality and compliance.

Construction machinery, automotive components, industrial machinery, structural frameworks, agricultural equipment, and aerospace applications.

Marked with grade, size, and manufacturer details; packaged with anti-corrosion oil and protective wrapping or crates to prevent damage during transport.

Their high strength, precision tolerances, and versatile material options ensure reliable performance in demanding mechanical and structural applications.

Industrial Applications

Mechanical Tubes are critical for a wide range of industries, delivering high strength, precision, and versatility in applications from automotive to renewable energy.

Automotive Industry

Used in exhaust systems, chassis, suspension components, and fuel delivery systems.

Construction & Infrastructure

Supports structural frameworks, scaffolding, bridges, tunnels, and plumbing/HVAC systems.

Manufacturing & Machinery

Used in conveyors, robotic arms, hydraulic systems, shafts, cylinders, and machine frames.

Energy & Renewable Power

Supports wind turbine frameworks, solar tracking systems, oil/gas pipelines, and power generation components.

Aerospace & Defense

Used in aircraft structures, rocket components, defense equipment, and hydraulic systems.

Agriculture

Supports tractor components, ground clearing equipment, and irrigation systems.

Furniture

Used in frames, supports, and aesthetic elements for durable furniture designs.

Other Applications

Used in playground equipment, greenhouse structures, restaurant equipment, hospital beds, and garden tools.

Why Mechanical Tubes?
Their precision manufacturing, high-strength materials, and versatile applications ensure reliable performance across diverse industries.

Mechanical Tubes

Mechanical Tubes

Technical Specifications