Boring Tubes for Hydraulic and Pneumatic Systems

Seamless Tubes For High-precision Applications

Boring tubes offer high precision and durability for hydraulic and pneumatic systems in industrial applications.

Boring Tubes Hydraulic Cylinder Tubes Pneumatic Cylinder Tubes Seamless Boring Tubes +2 More

Boring Tubes for Hydraulic and Pneumatic Systems

Seamless Tubes For High-precision Applications

Boring tubes offer high precision and durability for hydraulic and pneumatic systems in industrial applications.

Boring Tubes Hydraulic Cylinder Tubes Pneumatic Cylinder Tubes Seamless Boring Tubes +2 More

Boring Tubes are seamless, precision-engineered steel tubes designed for hydraulic cylinder tubes and pneumatic cylinder tubes. These tubes are manufactured through a boring process that ensures high dimensional accuracy and a smooth internal surface, making them ideal for applications requiring tight tolerances and reliable performance.

Conforming to standards like DIN 2391, EN 10305-1, and ASTM A519, Boring Tubes offer exceptional dimensional accuracy and surface quality, ensuring reliable performance in demanding industrial applications such as construction, automotive, and heavy machinery.

These tubes address challenges like internal surface wear, pressure fluctuations, and dimensional inconsistencies in precision systems. Their seamless construction and high-pressure resistance (up to 100 MPa) make them suitable for applications where reliability and precision are critical.

Boring is a machining operation used to enlarge or refine an existing hole or cavity in a workpiece. The boring tube is inserted into an existing hole to accurately shape and size it to the desired specifications. It is a cylindrical tool that rotates and cuts to achieve the desired precision in machining internal diameters or holes. Boring tubes are commonly used in various manufacturing processes to create accurate and precise bores in mechanical parts and components.

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Machining and Processes

• Boring tube machining techniques
• CNC boring tube operation流程
• Precision boring tube cutting methods
• Boring tube vs reaming differences

Tools and Equipment

• Carbide boring tube tools
• Heavy-duty boring tube equipment
• Automated boring tube systems
• Boring tube tool maintenance

Applications and Industries

• Boring tube applications in aerospace
• Boring tube in automotive industry
• Boring tube for hydraulic systems
• Boring tube for engine mechanical parts

Materials and Specifications

• High-strength boring tube materials
• Large-diameter boring tube specifications
• Seamless boring tube types
• Boring tube tolerance standards

Note: Boring tubes are precision-machined for various industrial applications, with options in materials like stainless steel and alloy steel. Contact manufacturers for custom machining services.

Frequently Asked Questions

Boring tubes are seamless steel tubes produced through a precision boring process, offering high dimensional accuracy and surface quality for hydraulic and pneumatic systems.

Common materials include carbon steel (ST52, CK45, AISI 1020), alloy steel (AISI 4140), and stainless steel, chosen for their strength and durability.

Boring tubes are produced through a precision boring process, while honed tubes are finished with abrasive stones. Boring tubes typically offer tighter tolerances and smoother surfaces.

Boring Tubes for Hydraulic and Pneumatic Systems Standard Specifications

Chemical Composition of Boring Tubes for Hydraulic and Pneumatic Systems
Grade	C (% max)	Si (% max)	Mn (%)	P (% max)	S (% max)
ST52 (DIN 2391)	0.22	0.55	1.60	0.025	0.015
E355 (EN 10305-1)	0.22	0.55	1.60	0.025	0.015
ASTM A519 1026	0.22–0.28	0.15–0.35	0.60–0.90	0.040	0.050

Mechanical Properties of Boring Tubes for Hydraulic and Pneumatic Systems
Grade	Tensile Strength (MPa min)	Yield Strength (MPa min)	Elongation (% min)
ST52 (DIN 2391)	600	520	14
E355 (EN 10305-1)	580	450	15
ASTM A519 1026	515	350	15

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

H-Series Hole Tolerances (H7, H8, H9, H10) by Diameter Range (mm)
ID (mm)	TOLERANCE (mm)
ID (mm)	H7	H8	H9	H10
≦30	+0.021/0	+0.033/0	+0.052/0	+0.084/0
30 – ≦50	+0.025/0	+0.039/0	+0.062/0	+0.100/0
50 – ≦80	+0.030/0	+0.046/0	+0.074/0	+0.120/0
80 – ≦120	+0.035/0	+0.054/0	+0.087/0	+0.140/0
120 – ≦180	+0.040/0	+0.063/0	+0.100/0	+0.160/0
180 – ≦250	+0.046/0	+0.072/0	+0.115/0	+0.185/0
250 – ≦315	+0.052/0	+0.081/0	+0.130/0	+0.210/0
315 – ≦700	+0.057/0	+0.089/0	+0.140/0	+0.230/0

This will provide long piston seal life and prevent failure of the cylinder. The tube material is selected on the basis of application & working pressure.

The seamless tube for hydraulic cylinders, obtained from high quality cold drawn tubes, available in a wide dimensional range.

Length: unfixed length or fixed length
Package: banding with steel strips, braiding parcel at outside
Conservation: Anti rust oiled coating on the inside and outside of the surface, plastic caps at both ends.

Manufacturing Process

Raw Material Selection

Select round bars of suitable size that meet the required standards as raw material bars for processing.

Billeting

Process the steel round bar through free forging and heat treatment.

Straightening

Use a forging hammer to straighten the treated raw material bar.

Making Mother Tubes

Produce seamless mother pipes from the round bars using hot rolling, hot extrusion, or hot piercing.

Cold Drawing

Cold draw the mother pipe to create cold-drawn seamless tubes (CDS tubes) and prepare pre-honed tubes.

Honing Inner Diameter

The honing process, a form of grinding and a finishing method, enhances surface finish and wear resistance with high productivity and machining accuracy.

Surface Finishing (NBK)

Apply NBK finish, phosphate-coating and normalizing the tubes for corrosion resistance, followed by oiling inside and outside.

Normalizing Process

Heat metals at a high temperature and allow them to cool naturally to room temperature, creating a tougher, more formable, harder, and ductile product.

Inspection and Packing

Inspect the finished honed tubes according to customer requirements and standards, ensuring compliance with size, accuracy, mechanical properties, and chemical composition.

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Standards and Specifications

• Honed tubes specifications
• DIN 2391 honed tube standards
• EN 10305-1 precision tube requirements
• ASTM A519 honed tubes certification

Applications

• Honed tubes for hydraulic cylinders
• Precision tubes for construction machinery
• Seamless honed tubes for automotive
• Pneumatic cylinder tubes applications

Material and Grades

• ST52 honed tube material
• E355 precision honed tubes
• ASTM A519 1026 tube composition
• Honed tubes mechanical properties

Manufacturing and Testing

• Honed tubes manufacturing process
• Precision honed tubes quality testing
• Seamless honed tubes surface treatment
• Honed tubes dimensional tolerances

Note: Honed tubes are precision-engineered for hydraulic and pneumatic systems, meeting DIN 2391, EN 10305-1, and ASTM A519 standards. Contact suppliers for detailed specifications.

Honed tubes are seamless steel tubes with a precision-honed or skived and roller-burnished bore, designed for hydraulic and pneumatic cylinders in industrial applications.

The most popular material for honed tubes is carbon steel grade SAE 1020. Other common materials include SAE 1026, E355, ST52.3, stainless steel, and alloy steels like AISI 4140 and 42CrMo, depending on application requirements.

Honed tubes are available in a wide range of sizes.
Typical inner diameters range from 32 mm to 600 mm (metric) or 1 inch to over 10 inches (imperial), with lengths up to 14–16 meters. Non-standard sizes can be custom-manufactured to meet specific project needs, such as precise tolerances or unique end treatments for assembly.

Honed tubes are used in hydraulic and pneumatic cylinders for applications such as construction machinery (e.g., excavators), automotive components (e.g., shock absorbers), industrial equipment (e.g., injection molding machines), automation systems, agricultural machinery, oil and gas, aerospace, and marine systems. Stainless steel honed tubes are also used in food and pharmaceutical industries for hygiene and corrosion resistance.

Honed tubes provide a smooth, precise internal surface (Ra 0.2–0.4 µm) that reduces friction and wear, enhances seal compatibility, and ensures leak-free performance in hydraulic and pneumatic cylinders. Made from high-strength materials, they offer durability and pressure resistance, with customizable sizes to meet diverse design needs.

Honed tubes are produced through: 1. **Raw Material Selection**: High-quality round steel bars (e.g., ST52, CK45). 2. **Billeting**: Forging and heat treatment of the steel. 3. **Straightening**: Correcting the bar’s shape. 4. **Mother Tube Production**: Hot rolling, extrusion, or piercing to form seamless pipes. 5. **Cold Drawing**: Reducing size and improving surface quality. 6. **Honing**: Using abrasive stones to achieve precise ID and surface finish (Ra 0.2–0.4 µm). 7. **Inspection and Packaging**: Ensuring quality standards, followed by phosphating and oiling for corrosion resistance.

Dimensional checks, surface roughness tests, hydrostatic tests, and nondestructive testing (ultrasonic or eddy current) ensure quality and compliance with standards like DIN 2391 and ASTM A519.

The most popular material of our honed tubes is carbon steel grade SAE 1020.
And we also produce honed cylinder tubes in other materials such as SAE 1026, E355 and ST52.3, stainless steel and so on.

The tube size e quality of steel required for the project were not standard, so it had been necessary not only to manufacture the tube on customer’s specification, starting from a specific raw material tube but also to plan a peculiar manufacturing process.

For example, also both left ends had been treated in order to let the assembly of the piece. It has to be stressed the importance of honing the left ends and the roundesses where the O-Ring is allocated since they impact dramatically on the system performance.

Industrial Applications

Honed tubes, characterized by their precisely machined inner surface, are essential components in various industrial applications where high accuracy and surface finish are crucial. They are used in hydraulic and pneumatic cylinders, offering precision and durability in construction, automotive, and industrial machinery applications.

Hydraulic Cylinders

They are a primary component in hydraulic cylinders, providing precise control and power in various applications.

Automotive Industry

Supports hydraulic systems in heavy vehicles and suspension systems.

Industrial Machinery

Used in injection molding and press machines for precision operation.

Automation Systems

Powers pneumatic cylinders in robotic and automated equipment.

Pneumatic Cylinders

Used in hydraulic systems for tractors and harvesters, providing precise control and power.

Aerospace & Marine

Supports hydraulic systems in marine equipment and vessels.

Why Honed Tubes? These tubes, made from high-quality seamless steel (e.g., ST52, E355), offer precision bore and corrosion resistance, ensuring reliable performance in high-pressure hydraulic and pneumatic systems.

Boring Tubes for Hydraulic and Pneumatic Systems

Boring Tubes for Hydraulic and Pneumatic Systems