Hydraulic tube

pneumaticcarbon steelheavy-duty

Product overview
The CK45 Honed Tube is a cold-drawn, precision-honed cylinder tube designed for hydraulic and pneumatic applications. Manufactured from CK45 (SAE1045/C45) medium carbon steel, it delivers high mechanical strength and wear resistance. Internal honing achieves a low-roughness surface and tight ID tolerances to improve sealing and extend seal life. EAST AI produces these tubes with advanced honing and SRB equipment for consistent quality.

Basic information

• Model: Honed Tube
• Brand: EAST AI
• Material: CK45 (SAE1045 / C45)
• Length: Up to 12 m (max listed 13 m on some pages)
• ID tolerance: H8 ~ H10 (typical H8/H9)
• Surface roughness: Ra ≤ 0.4 µm
• Application: Hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: Wooden cases; anti-rust oil, plastic film, woven bag, wooden cases or steel pallets

Chemical composition (CK45)

• Carbon (C): 0.42–0.50%
• Manganese (Mn): 0.50–0.80%
• Silicon (Si): 0.10–0.40%
• Sulphur (S): ≤ 0.035%
• Phosphorus (P): ≤ 0.035%

Key features

• High-strength medium-carbon material suitable for heavy-duty cylinders
• Excellent surface finish: Ra ≤ 0.4 µm after honing
• Precision ID tolerance: typically H8/H9
• Improved sealing and reduced friction for longer seal life
• Straightness control: ≤ 0.5 mm / 1000 mm
• High wear resistance for high-pressure systems
• Available in metric and imperial sizes

Specifications

• Material: CK45 / SAE1045 / C45
• Manufacturing: Cold drawn + Honed (SRB optional)
• ID tolerance: H8 / H9 (typical)
• Roughness: Ra ≤ 0.4 µm
• Straightness: ≤ 0.5 mm / 1000 mm
• Outer diameter: 30 mm – 400 mm
• Inner diameter: 20 mm – 350 mm
• Wall thickness: Customized
• Length: Up to 12 meters (max 13 m listed elsewhere)
• Standards: DIN 2391, EN 10305-1, ASTM A519

Manufacturing process

• Material selection: seamless CK45 steel tubes
• Cold drawing to improve dimensional accuracy
• Normalizing / stress relief to stabilize properties
• Honing or skiving & roller burnishing (SRB) for mirror-like ID finish
• Precision measurement: ID tolerance, surface roughness, roundness, straightness
• Cleaning and anti-rust treatment
• Final inspection and packaging: 100% inspection on ID roughness, tolerance and straightness

Applications

• Hydraulic cylinder barrels
• Pneumatic cylinder tubes
• Construction and earthmoving machinery
• Agricultural equipment
• Lifting and material handling systems
• Mining and drilling equipment
• Industrial automation machinery
• Machine tools and mechanical components

Advantages

• High surface precision for low friction and extended seal life
• Suitable for high-pressure, heavy-duty hydraulic applications
• Strong mechanical and fatigue properties from CK45 material
• Wide size range and customization (OEM/ODM available)
• Strict quality control with ISO9001-based inspection

Packaging and delivery

• Packing: Anti-rust oil, plastic film, woven bag, wooden cases or steel pallets
• Delivery time: 20–30 days after order confirmation
• Shipping: Sea, air, rail or multimodal transport
• Export markets: Europe, Russia, Southeast Asia, South America, Middle East

Why EAST AI
Experienced hydraulic components manufacturer equipped with advanced honing and SRB machines, comprehensive quality management (ISO9001) and complete product lines including honed tubes, chrome-plated bars, hydraulic cylinders and power units.