Honed Tube China Manufacturer and Wholesale Supplier
Features of Honed Cylinder Tubes
- Precision Honing: Tight ID tolerances for reliable hydraulic cylinder performance.
- Superior Surface Finish: Smooth internal bore with low roughness for extended seal life.
- Custom Sizes Available: Wide range of ID, OD, wall thickness, and cut-to-length options.
- Hydraulic Cylinder Ready: Manufactured specifically for hydraulic and pneumatic cylinders.
- Fast Production & Delivery: Quick lead times and ready-stock sizes for urgent projects.
- Multiple Material Grades: Carbon steel, stainless steel, and specialty alloys available.
- Global Export Support: Professional packaging and worldwide shipping capabilities.
- Technical Support: Expert assistance with material selection and application requirements.
Buy Bulk Honed Tubes from Baokun
At Baokun, we supply custom honed tubes in a full range of specifications, including size, material, inner diameter, wall thickness, and surface coating. Our minimum order quantity starts from just 1 ton. We maintain large stock to support stable supply and fast processing. Most orders are shipped within 7 days after confirmation. In addition, we provide quick quotations within 2 hours to help customers speed up sourcing decisions and project planning.
| Standard | DIN2391, DIN2393, EN10305, ASTM A519, GOST8732 |
| Material | Carbon Steel (E355, ST52, CK45); Alloy Steel (4130, 4140, 34CrMo4, 35CrMo, 27SiMn, 42CrMo/40XM, 40Cr/40X, 30XГСА) |
| Inner Diameter Tolerance | H7, H8, H9, H10 |
| Straightness Tolerance | 0.3 – 1.0 mm / 1000 mm |
| Surface Roughness | 0.1 – 0.4 μm |
| Length | 3 – 9 m, or as per customer requirements |
Honing removes micro-roughness inside the tube, creating a mirror-like finish. This reduces friction between the piston seal and the tube wall, allowing smoother movement and better efficiency.
A properly honed bore ensures better contact between seals and the cylinder wall. This minimizes oil leakage, improves pressure retention, and increases hydraulic system stability.
The smooth, uniform surface reduces wear on both the tube and seals. This lowers maintenance frequency and extends the overall lifespan of the hydraulic cylinder.
Honing corrects minor dimensional inaccuracies and improves roundness and straightness. This ensures consistent performance, better load handling, and fewer operational issues like sticking or uneven motion.
Why Choose BAOKUN For Honed Tubes
BAOKUN supplies honed tubes for hydraulic cylinders, pneumatic systems, machinery, and other precision applications. Custom specifications and dimensions are available to meet different technical and project requirements.
We also support custom colors, packaging, labels, logos, and OEM/ODM services. Flexible production and export packaging help distributors, equipment manufacturers, and project buyers source honed tubes for bulk orders and specific market needs.
Applications of Honed Tubes
Hydraulic Cylinder Systems
Honed cylinder tubes provide a precision inner bore that ensures stable piston movement under high pressure. This reduces internal leakage and improves sealing performance in hydraulic cylinders used in industrial machinery.
Pneumatic Cylinder Systems
In pneumatic cylinders, honed tubes minimize friction between the piston seal and cylinder wall, ensuring smoother motion, lower wear, and more consistent actuator response during repeated operation.
Automotive Hydraulic Systems
Honed tubes are widely used in automotive hydraulic systems such as braking, steering, and suspension. Their smooth internal surface ensures accurate fluid transmission, improving safety and driving responsiveness.
Industrial Machinery Cylinders
Heavy-duty equipment such as excavators, loaders, and cranes rely on honed tubes for hydraulic cylinders operating under high load and impact conditions. The precision bore improves wear resistance and extends service life.
Honed Tube Tolerance
| Inner Diameter (mm) | Inner Diameter Tolerance (mm) |
Wall Thickness Tolerance (mm) |
|||
| H7 | H8 | H9 | H10 | ||
| ≤30 | +0.021/0 | +0.033/0 | +0.052/0 | +0.084/0 | ±7.5%>210mm±10% |
| 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 | |
Inside BAOKUN Factory: Honing Equipment
Since 2004, we have continuously invested in honing equipment and process improvements. Starting from seamless steel tubes — drawn and inspected in-house — our production lines carry each tubes through precision honing to achieve consistent bore tolerances and surface finishes down to Ra 0.4 µm. The result is tube ready for direct use in hydraulic cylinders, pneumatic actuators, telescopic systems, and other precision linear applications.
Honed Tube Manufacturing Process
| No. | Process | Description |
| 1 | Raw material processing | Steel tube selection: Steel tubes selected in different grades for various working conditions.
Inner hole pre-processing: inner diameter allowance 0.3-0.5mm (for subsequent honing) Cutting: Fully automatic band saw , cut verticality ≤ 0.1mm/100mm. |
| 2 | Deep hole boring | Baokun uses a famous German brand of deep hole drilling and boring machine (BTA system)
Process parameters:
|
| 3 | Heat treatment strengthening | Process type:
Metallographic inspection:
|
| 4 | Multi-stage honing process | Rough honing stage:
Fine honing stage:
|
| 5 | Surface strengthening treatment | Rolling process:
Cleaning and passivation:
|
| 6 | l Full-size inspection | Inspection items:
|
Export Packaging and Delivery
Trusted Quality Backed by Certifications
Carbon Steel vs. Alloy Steel Honed Tubes - Buying Guide
Carbon Steel Honed Tubes
Carbon steel honed tubes are the most commonly used option in standard hydraulic systems. They are typically made from grades like E355 or ST52 and offer a good balance of strength, cost, and availability.
Key advantages:
- Cost-effective and widely available
- Good mechanical strength for general hydraulic use
- Easy to machine, weld, and process
- Suitable for standard-pressure cylinders
Typical applications:
- Agricultural machinery
- General industrial hydraulic cylinders
- Light to medium-duty equipment
👉 Best choice when budget efficiency and standard performance are the main priorities.
Alloy Steel Honed Tubes
Alloy steel honed tubes contain additional elements such as chromium, molybdenum, or manganese (e.g., 4140, 42CrMo, 34CrMo4). These additions significantly improve strength and performance.
Key advantages:
- Higher tensile and yield strength
- Better wear resistance and fatigue life
- Excellent performance under high pressure and heavy loads
- Suitable for demanding environments
Typical applications:
- Heavy machinery and construction equipment
- High-pressure hydraulic systems
- Mining and offshore equipment
- High-performance industrial cylinders
👉 Best choice when durability and extreme working conditions are required.
Quick Comparison Table
| Feature | Carbon Steel (E355 / ST52) | Alloy Steel (4140 / 42CrMo) |
|---|---|---|
| Strength | Medium | High |
| Cost | Lower | Higher |
| Wear resistance | Standard | Excellent |
| Pressure capability | Medium | High |
| Applications | General use | Heavy-duty systems |
Choosing Between Honed Tubes and SRB Tubes
Honed Tubes are internally ground using abrasive stones to achieve a very smooth, precise inner surface. The process removes material to reach tight tolerances and a fine finish.
SRB Tubes (Skived & Roller Burnished) are first skived (material is cut/peeled from the inner surface) and then roller burnished (surface is compressed and smoothed). This creates a hardened, polished inner surface without abrasive grinding.
When to Choose Which?
Choose Honed Tubes if:
- You need ultra-precise internal diameter
- The system requires very low friction and high sealing performance
- You are building high-end or precision hydraulic cylinders
Choose SRB Tubes if:
- You need higher surface hardness and durability
- The application involves heavy-duty or high-cycle operations
- You want better cost efficiency in bulk production
Honed Tube FAQ
What are honed tubes?
Honed tubes are precision steel tubes that have been internally finished using a honing process to achieve a highly smooth surface and accurate inner diameter. They are widely used in hydraulic and pneumatic cylinder applications where low friction, tight tolerances, and reliable sealing performance are required.
During manufacturing, a cold drawn or seamless steel tube is mechanically honed to remove surface imperfections and improve dimensional accuracy. This process results in a mirror-like internal finish that helps hydraulic pistons move smoothly with minimal wear and leakage.
Honed tubes are typically made from high-quality carbon steel or alloy steel such as E355 or ST52, ensuring strong mechanical performance and durability under high pressure. They are commonly supplied with precise H7 or H8 tolerances, depending on application requirements.
What is the difference between honed tube and hydraulic cylinder tube?
These two terms are closely related but describe different aspects of the same product. A honed tube refers to any precision tube that has been processed through an internal honing operation — a abrasive finishing technique that removes material to achieve a very smooth, tight-tolerance inner diameter (ID). Honing improves surface finish, roundness, and dimensional accuracy.
A hydraulic cylinder tube is the finished housing or barrel of a hydraulic actuator. In practice, virtually all hydraulic cylinder tubes are honed, because the piston and seals that travel inside demand a mirror-smooth bore to function without leaking or wearing prematurely.
What is H8 tolerance for honed cylinder tubes?
H8 is an ISO 286 standard fit designation for the internal diameter of a hole (hence the capital “H”). It defines both the nominal size and the permitted deviation from that size. For honed cylinder tubes, H8 is among the most widely specified tolerances because it strikes the right balance between machining cost and functional performance.
Under H8, the lower deviation is always zero — meaning the bore cannot be smaller than nominal. The upper deviation increases with diameter; for a common size like Ø50 mm, H8 allows a maximum positive deviation of +0.039 mm, giving a tolerance band of 39 µm. For Ø80 mm, the band is 46 µm.
In practice, H8 provides sufficient clearance for piston seals and guide rings to seat correctly while keeping lateral play tight enough to prevent excessive side-loading. Tighter grades such as H7 are used where concentricity is critical; looser grades such as H9 suit lower-pressure applications.
What surface roughness is required for honed tubes?
Surface roughness for honed tubes is expressed as Ra (arithmetic mean roughness) and the required value depends directly on the seal type and operating pressure. The honing process creates a characteristic cross-hatch pattern that is crucial: it holds a thin oil film that lubricates the seals on every stroke, dramatically extending seal life.
For standard hydraulic cylinder applications, the bore surface finish is typically specified at Ra 0.2–0.4 µm (equivalent to approximately Rz 1–4 µm). High-performance servo cylinders and precision pneumatic actuators may require Ra ≤ 0.1 µm. Coarser finishes above Ra 0.8 µm accelerate seal wear and compromise sealing efficiency.
The honing cross-hatch angle also matters: a 40–60° included angle is standard for hydraulic cylinders, providing the optimal oil-retention geometry.
Can BAOKUN supply custom ID/OD honed tubes?
Yes — BAOKUN specialises in custom-dimension honed tubes produced to customer-specified inner diameter (ID), outer diameter (OD), wall thickness, and length. Standard catalogue sizes are available for quick shipment, but the real value of working with a manufacturer is the ability to define non-standard dimensions that match your cylinder design exactly, eliminating the need for secondary machining.
Are honed tubes supplied with anti-rust oil and end caps?
Yes — this is standard practice among professional honed tube suppliers and is an important quality detail to confirm before ordering. After honing, the bore surface is extremely clean and smooth, but also highly susceptible to oxidation. A thin film of anti-rust (preservation) oil is applied to the bore immediately after the honing process to protect the finish during storage and transit.
Plastic end caps (or plugs) are fitted to both ends of the tube to prevent contamination — dust, moisture, and debris — from entering the bore and damaging the precision surface finish. Without end caps, even a short period of improper storage can introduce particles that score the bore during cylinder assembly.
