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ASTM A519 is the standard for seamless carbon alloy steel pipe developed by the American Society for Testing and Materials (ASTM). Designed specifically for applications requiring stringent strength and precision, such as mechanical structures, transmission systems, and hydraulic equipment, ASTM A519 Alloy Tube has become a core pipe solution for industries such as automotive, construction machinery, and energy, thanks to its reliable seamless process, diverse material options, and excellent mechanical properties.
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What is ASTM A519 Mechanical Tubing?
ASTM A519 is a seamless mechanical steel tubing standard used for engineering and structural applications requiring:
High mechanical strength
Precision machining capability
Tight dimensional control
Heat treatment compatibility
Unlike pressure pipes (A106 / A53), A519 is designed for mechanical parts, not fluid transport systems.
👉 It is the core material for:
Automotive shafts
Hydraulic cylinders
Machinery components
Heavy engineering parts
ASTM A519 Steel Grades Overview (Hub Section)
We supply full ASTM A519 material grades:
🔹 Carbon Steel Tubes
ASTM A519 1010 tubing
ASTM A519 1026 tubing
🔹 Alloy Steel Tubes
ASTM A519 4130 chrome-moly tubing
ASTM A519 4140 quenched & tempered tubing
ASTM A519 8620 case hardening steel tube
👉 Each grade has different strength, hardness, and machining performance.
Quick Grade Selection Guide
Choose 1010 / 1020 if:
✔ Low cost
✔ General mechanical parts
✔ Moderate strength required
Choose 4130 if:
✔ High strength needed
✔ Automotive / aerospace parts
✔ Weldable alloy steel
Choose 4140 if:
✔ High hardness required
✔ Heavy-duty machinery
✔ Wear-resistant components
COMPARATIVE DATA SEAMLESS CARBON STEELS
COMPARATIVE DATA
|
|||||
|
Condition |
Nominal |
Nominal |
Nominal |
Equivalent |
Equivalent |
|
GRADE 1018 |
|||||
|
Hot-Rolled |
35,000 |
60,000 |
30 |
B-68 |
116 |
|
Normalized |
38,000 |
58,000 |
35 |
B-66 |
114 |
|
Soft-Annealed |
33,000 |
50,000 |
40 |
B-57 |
97 |
|
As-Drawn |
70,000 |
85,000 |
10 |
B-87 |
170 |
|
CD-Stress Relief Annealed |
60,000 |
80,000 |
15 |
B-85 |
163 |
|
GRADE 1020 |
|||||
|
Hot-Rolled |
38,000 |
60,000 |
30 |
B-68 |
116 |
|
Normalized |
40,000 |
58,000 |
35 |
B-66 |
114 |
|
Soft-Annealed |
33,000 |
53,000 |
40 |
B-62 |
105 |
|
As-Drawn |
65,000 |
80,000 |
10 |
B-85 |
163 |
|
CD-Stress Relief Annealed |
60,000 |
75,000 |
15 |
B-81 |
149 |
|
GRADE 1026 |
|||||
|
Hot-Rolled |
47,000 |
70,000 |
28 |
B-77 |
137 |
|
Normalized |
50,000 |
67,000 |
33 |
B-74 |
131 |
|
Soft-Annealed |
36,000 |
60,000 |
35 |
B-68 |
116 |
|
As-Drawn |
72,000 |
87,000 |
10 |
B-89 |
179 |
|
CD-Stress Relief Annealed |
65,000 |
82,000 |
15 |
B-86 |
167 |
WALL THICKNESS TOLERANCES FOR ROUNDa,b,c
|
||
|
Cold Drawn Maximum % Over |
Wall Thickness |
|
|
ID Up To |
ID 1.500 Inches |
|
|
10 |
7.5 |
25 and Under |
|
12.5 |
10 |
Over 2 |
| ID Tolerances apply to dimensions 0.625 inch and over when ID is at least half the OD | |
| a | Many tubes with inside diameter less than 50% of outside diameter or with wall thickness more than 25% of outside diameter, or with wall thickness over 11¼4 in., or weighing more than 90 lb/ft, are difficult to draw over a mandrel. Therefore, the inside diameter can vary over or under by an amount equal to 10% of the wall thickness. See also Footnote B. |
| b | For those tubes with inside diameter less than 1/2 in. (or less than 5/8 in. when the wall thickness is more than 20% of the outside diameter), which are not commonly drawn over a mandrel. Footnote A is not applicable. Therefore, for those tubes, the inside diameter is goverened by the outside diameter tolerance shown in thiis table and the wall thicnkess tolerances shown in Table 9. |
| c | Tubing having a wall thickness less than 3% of the outside diameter cannot be straightened properly without a certain amount of distortion. Consequently such tubes, while having an average outside diameter and inside diameter within the tolerances shown in this table, require an ovality tolerance of 1/2% over and under nominal outside diameter, this being in addition to the tolerances indicated in this table. |
ASTM A519 vs Other Steel Standards
| Standard | Type | Application |
|---|---|---|
| ASTM A519 | Mechanical tubing | Shafts, machinery, hydraulic parts |
| ASTM A106 | Pressure pipe | Oil, gas, steam lines |
| ASTM A53 | Structural pipe | Construction |
| ASTM A513 | Welded tubing | Low precision mechanical parts |
👉 Conclusion:
ASTM A519 is the precision engineering standard for mechanical systems
Applications of ASTM A519 Tubing
🚗 Automotive Industry
Drive shafts
Steering columns
Transmission parts
🏭 Machinery Manufacturing
Machine spindles
Gear shafts
Structural frames
⚙ Hydraulic Systems
Hydraulic cylinders
Piston rods
Actuators
🛢 Oil & Gas Industry
Downhole tools
Drilling components
High-strength connectors
🏗 Industrial Engineering
Bearing systems
Load-bearing structures
Heavy mechanical assemblies
Surface Finish Options
Black finish
Oiled anti-rust coating
Pickled & passivated
Bright cold drawn finish
Quality Assurance System
✔ Chemical composition analysis
✔ Mechanical property testing
✔ Ultrasonic testing (UT)
✔ Dimensional inspection
✔ Third-party inspection (SGS / BV)
✔ Mill Test Certificate (MTC)
Related Products Hub
👉 Explore related steel tubing:
ASTM A106 Seamless Pipe (pressure systems)
ASTM A53 Carbon Steel Pipe (structural use)
ASTM A513 Welded Mechanical Tube
ASTM A789 Stainless Steel Tube (corrosion resistant)
Alloy Steel Seamless Tubing (general category)
Industry Solutions
We provide ASTM A519 tubing solutions for:
Automotive OEM manufacturing
Hydraulic system manufacturers
Heavy machinery factories
Oil & gas equipment suppliers
Industrial engineering contractors
Why Choose Our ASTM A519 Tubing?
✔ Stable mill production
✔ Full grade availability
✔ Precision machining support
✔ Global export experience
✔ Fast quotation response
✔ OEM customization available
FAQ
1. What is ASTM A519 used for?
It is used for mechanical engineering applications such as shafts, hydraulic cylinders, and machinery components.
2. Is ASTM A519 seamless?
Yes, it is a seamless mechanical tubing standard.
3. What is the difference between A519 and A106?
A519 is for mechanical use, A106 is for pressure piping.
4. What steel grades are available in A519?
1010, 1020, 1026, 4130, 4140, 8620.
5. Can ASTM A519 be heat treated?
Yes, especially alloy steel grades.
6. What industries use A519 tubing?
Automotive, machinery, oil & gas, hydraulic systems.
7. Is A519 suitable for hydraulic cylinders?
Yes, it is widely used in hydraulic applications.
8. What is the advantage of seamless tubing?
Higher strength, no weld defects, better mechanical reliability.
Contact Us
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Xi'an Dongmeng Group Co., Ltd
We provide:
Fast quotation within 12 hours
Global export service
Mill Test Certificate (MTC)
OEM & customized cutting
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