304 Stainless Steel Precision Honed Tube-Specialized for Hydraulic Cylinders, Pneumatic Cylinder Barrels and High-Precision Equipment
Product Advantages
1. Ultra-High Precision and Surface Quality
Inner diameter tolerance可达 H7/H8/H9 grades, ID tolerance ≤0.039mm
Roundness error ≤0.005mm (precision grade) to ≤0.02mm (standard grade)
Surface roughness Ra as low as 0.08μm (near mirror finish), far superior to ordinary steel pipes (Ra 1.6~3.2μm)
2. Excellent Mechanical Properties
Roller burnishing forms a cold-worked hardened layer, significantly increasing microhardness (HV≥400)
Surface residual compressive stress layer seals micro-cracks, improving fatigue strength by 30%
Wear resistance increased by more than 2 times, effectively extending service life of components
3. Superior Sealing and Fluid Performance
Mirror-like inner wall significantly reduces fluid resistance and energy loss
High roundness ensures tight fit between piston/seal components, eliminating oil and gas leakage
Cross-hatch pattern (30°–60°) formed during honing enhances lubrication retention and sealing performance
4. Strong Processing Compatibility
Product Applications
Honed tubes are widely used in various industrial fields with stringent requirements for dimensional accuracy, surface finish, and mechanical properties:
Hydraulic Systems
Hydraulic cylinder barrels, high-pressure oil pipes, servo valve bodies
Construction machinery (excavators, bulldozers, loaders, cranes, hydraulic breakers) cylinder barrels
Agricultural equipment (tractors, harvesters, sprayers) hydraulic circuits
Pneumatic Systems
Pneumatic cylinder barrels, rodless cylinders, standard cylinders
Precision automation systems, servo cylinders
Automotive Industry
Automotive shock absorber sleeves, steering system precision tubes
Internal combustion engine fuel delivery pipes
High-End Equipment
Marine steering systems, deck machinery
Petroleum machinery (blowout preventers, subsea control systems, drilling equipment)
Other Applications
Product Specifications
Specification Table
Inner Diameter Tolerance Table (Unit: mm)
| ID Range (mm) | H7 Tolerance | H8 Tolerance | H9 Tolerance | H10 Tolerance |
|---|---|---|---|---|
| ≤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 |
| Outer Dia (mm) | Inner Dia (mm) | Wall Thickness (mm) | Length (m) | Tolerance Grade | Surface Roughness (Ra/μm) | Application |
|---|---|---|---|---|---|---|
| Φ40 | Φ25 | 7.5 | 3 | H7 | ≤0.4 | Hydraulic cylinder piston rod guide sleeve |
| Φ60 | Φ40 | 10 | 4 | H8 | ≤0.8 | Cylinder inner bore |
| Φ100 | Φ80 | 10 | 6 | H9 | ≤1.6 | Heavy machinery hydraulic cylinder |
Packaging and Shipping
Standard export packing. The modes of transportation include containerized sea freight, bulk sea freight, air freight, land transportation, and multi-modal transportation.
We understand that the integrity of your purchase is of utmost importance. That’s why, once you place your order, our Honing Tubes are carefully packaged in standard shipping packaging. We have established long-term partnerships with reliable shipping companies to ensure that your product arrives at your doorstep in perfect condition. Our commitment to quality extends beyond the product itself; from the moment you click “buy” to the moment you unbox your Honing Tube, your satisfaction is our top priority.
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Q1. who are we?
A：We are based in Tianjin China, start from 2015,sell to Southeast Asia(26.00%),Africa(8.00%),Eastern Europe(8.00%),Eastern Asia(7.00%),Western Europe(7.00%),Southern Europe(7.00%),North America(6.00%),South America(6.00%),Northern Europe(6.00%),Oceania(5.00%),Central America(5.00%),Mid East(5.00%),South Asia(4.00%). There are total about 5-10 people in our office.
Q2. how can we guarantee quality?
A：Always a pre-production sample before mass production;
Always final Inspection before shipment;
Q3.what can you buy from us?
A：Rectangle Steel Tubes, Triangular Seamless Steel Pipes, Cold Rolled High Precision Seamless Steel Pipes, Hot Rolled Seamless Steel Pipes
Q4. why should you buy from us not from other suppliers?
A: SKY STEEL CONSTRUCTION LIMITED which is a professional manufacturer more than 20 years .The main products are seamless steel pipes, galvanized steel pipe, welded steel pipe ,square&rectangular tube and scaffolding products.
Q5. what services can we provide?
A: Accepted Delivery Terms: FOB, CFR, CIF, EXW, Express Delivery；
Accepted Payment Currency: USD, EUR, CNY;
Accepted Payment Type: T/T, Credit Card, PayPal, Western Union, Cash, Agency;