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For applications demanding superior formability and consistent quality, the EN 10305-1 E215 Honed Seamless Steel Tube offers an exceptional balance of precision and performance. Manufactured to the rigorous EN 10305-1 standard, this cold-drawn seamless (CDS) tube guarantees tight dimensional tolerances on outer diameter and wall thickness. The E215 steel grade provides excellent ductility and weldability, making it ideally suited for complex forming operations. Combined with a ready-to-use honed internal surface that minimizes friction, it delivers reliable performance in hydraulic, pneumatic, and various mechanical applications.
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What is EN 10305-1 E215 honed seamless steel tube?
EN 10305-1 E215 honed seamless steel tube is engineered for high-performance hydraulic cylinder systems. With precision honed inner diameter, low roughness, and seamless structure, it ensures smooth piston motion, reduced wear, and extended service life in demanding industrial environments.
Core Performance Advantages
Precision Inner Diameter Control
Honed ID tolerance: H7–H10
Ensures perfect sealing performance
Prevents hydraulic leakage
Seamless Structure = Higher Safety
No weld seam defects
Better pressure resistance
Longer fatigue life
Ultra-Smooth Inner Surface
Roughness: Ra ≤ 0.8 μm
Reduces friction between piston & tube
Improves system efficiency
Excellent Machinability (E215 Steel)
Easy welding & processing
Cost-effective for OEM production
Designed for Critical Hydraulic Applications
🚜 Construction Machinery
Excavators, loaders, and cranes require durable cylinder tubes with high wear resistance.
🏗️ Industrial Equipment
Hydraulic presses and automation systems demand stable and precise motion control.
🚛 Mobile Hydraulics
Used in trucks, forklifts, and lifting systems where reliability is critical.
Precision Manufacturing Process
Cold Drawing → Heat Treatment → Honing / SRB → Straightening → Inspection
Honed Tube vs Ordinary Steel Tube
| Feature | Honed Tube | Standard Tube |
|---|---|---|
| Inner Surface | Mirror-like | Rough |
| Tolerance | H8–H10 | Loose |
| Friction | Low | High |
| Service Life | Long | Short |
| Application | Hydraulic Cylinder | General use |
Tolerance
| OD(mm) | ID(mm) | Tolerance | ||
| OD(mm) | ID(mm) | W.T(mm) | ||
| 40-74 | 30-65 | ±0.01 | -0.3-0.5 | ≤0.5 |
| 74-98 | 65-85 | ±0.01 | -0.4-0.6 | ≤0.5 |
| 100-116 | 85-100 | ±0.02 | -0.4-0.6 | ≤0.6 |
| 124-134 | 110-115 | ±0.02 | -0.6-0.8 | ≤0.6 |
| 140-158 | 120-135 | ±0.02 | -0.7-0.9 | ≤0.8 |
| 165-176 | 140-150 | ±0.02 | -0.7-0.9 | ≤0.8 |
| 188-203 | 160-180 | ±0.02 | -0.7-0.9 | ≤0.8 |
Honed
| ID size | ID deviation(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 |
| >315-400 | +0.057 0 | +0.089 0 | +0.140 0 | +0.230 0 |
Standard Size
| I.D(mm) | O.D(mm) | WT(mm) | I.D(mm) | O.D(mm) | WT(mm) | I.D(mm) | O.D(mm) | WT(mm) |
| 40 | 50 | 5 | 90 | 100 | 5 | 140 | 156 | 8 |
| 40 | 52 | 6 | 90 | 105 | 7.5 | 140 | 160 | 10 |
| 40 | 55 | 7.5 | 90 | 110 | 10 | 140 | 165 | 12.5 |
| 40 | 58 | 9 | 90 | 114 | 12 | 140 | 168 | 14 |
| 50 | 60 | 5 | 95 | 105 | 5 | 140 | 170 | 10 |
| 50 | 65 | 7.5 | 95 | 110 | 7.5 | 140 | 180 | 20 |
| 50 | 70 | 10 | 100 | 110 | 5 | 150 | 170 | 10 |
| 60 | 70 | 5 | 100 | 115 | 7.5 | 150 | 175 | 12.5 |
| 60 | 72 | 6 | 100 | 120 | 10 | 150 | 180 | 15 |
| 60 | 75 | 7.5 | 100 | 125 | 12.5 | 160 | 180 | 10 |
| 60 | 80 | 10 | 100 | 127 | 13.5 | 160 | 185 | 12.5 |
| 63 | 73 | 5 | 100 | 130 | 15 | 160 | 190 | 10 |
| 63 | 75 | 6 | 110 | 125 | 7.5 | 160 | 200 | 20 |
| 63 | 76 | 6.5 | 110 | 130 | 10 | 170 | 190 | 10 |
| 63 | 78 | 7.5 | 110 | 140 | 15 | 170 | 195 | 12.5 |
| 63 | 80 | 8.5 | 115 | 130 | 7.5 | 170 | 200 | 15 |
| 63 | 83 | 10 | 115 | 135 | 10 | 180 | 200 | 10 |
| 70 | 80 | 5 | 120 | 135 | 7.5 | 180 | 205 | 12.5 |
| 70 | 82 | 6 | 120 | 140 | 10 | 180 | 210 | 15 |
| 70 | 85 | 7.5 | 120 | 145 | 12.5 | 180 | 220 | 20 |
| 70 | 90 | 10 | 120 | 150 | 15 | 200 | 220 | 10 |
| 75 | 85 | 5 | 125 | 140 | 7.5 | 200 | 225 | 12.5 |
| 75 | 90 | 7.5 | 125 | 145 | 12.5 | 200 | 230 | 15 |
| 75 | 95 | 10 | 125 | 150 | 12.5 | 200 | 235 | 17.5 |
| 80 | 90 | 5 | 125 | 152 | 13.5 | 200 | 245 | 22.5 |
| 80 | 92 | 6 | 125 | 155 | 15 | 220 | 250 | 15 |
| 80 | 95 | 7.5 | 125 | 160 | 17.5 | 220 | 270 | 25 |
| 80 | 100 | 10 | 130 | 145 | 7.5 | 220 | 273 | 26.5 |
| 80 | 102 | 11 | 130 | 150 | 10 | 240 | 270 | 15 |
| 80 | 105 | 12.5 | 130 | 160 | 15 | 250 | 290 | 20 |
| 80 | 110 | 15 | 135 | 160 | 12.5 | 250 | 299 | 24.5 |
| Special requirement | 230.5 | 254 | 11.75 | |||||
Honed Tube vs Ordinary Steel Tube
| Feature | Honed Tube | Standard Tube |
|---|---|---|
| Inner Surface | Mirror-like | Rough |
| Tolerance | H8–H10 | Loose |
| Friction | Low | High |
| Service Life | Long | Short |
| Application | Hydraulic Cylinder | General use |
Common Buyer Concerns & Our Solutions
Problem 1: Inner surface not smooth → Cylinder failure
✅ Solution: Precision honing + roughness testing
Problem 2: Size inconsistency
✅ Solution: 100% dimensional inspection
Problem 3: Rust during shipping
✅ Solution: Anti-rust oil + sealed packaging
Inspection & QA
ID roughness testing
Dimensional tolerance inspection
Ultrasonic testing
Chemical composition analysis
EN 10204 3.1 certification
Custom Honed Tube Solutions
Custom ID / OD sizes
SRB or Honed processing
Pre-machined tubes
Length cutting service
Frequently Asked Questions (FAQ)
1. What is the main advantage of the E215 grade for cylinder manufacturing?
The primary advantage is its excellent weldability. E215's low carbon equivalent allows for easy welding without the need for complex pre- or post-heat procedures, making it ideal for welding cylinder barrels to end caps. Its high ductility also makes it perfect for applications requiring minor forming or flaring.
2. How does a honed finish benefit my hydraulic cylinder performance?
The honed internal surface creates an ideal bearing surface for piston seals. The cross-hatched pattern retains lubrication, while the smooth finish (low Ra value) significantly reuces friction and wear, leading to smoother operation, less leakage, and a longer service life for the entire cylinder.
3. Why should I choose a seamless tube over a cheaper welded alternative?
Seamless tubes have no longitudinal weld seam, which is a potential failure point under high cyclic pressure and fatigue. Choosing seamless construction ensures uniform strength and hardness around the entire circumference, providing greater reliability and safety for demanding applications.
4. What dimensional tolerances can I expect with EN 10305-1 tubes?
You can expect precision tolerances, typically to h9 for Outer Diameter and E3 for Wall Thickness, as defined by the standard. This high level of consistency ensures reliable sealing and simplifies the piston and gland design and assembly process.
5. Are these tubes suitable for chrome plating?
Yes, the homogeneous structure and smooth surface of the E215 honed tube make it an excellent substrate for chrome plating. It ensures good adhesion and a high-quality, durable finished surface.
6. Can you provide custom-cut lengths?
Absolutely. We specialize in providing value-added services. We can supply tubes in custom-cut lengths to your exact specifications, minimizing your waste and handling costs. We can also discuss non-standard diameters and wall thicknesses.
7. What certification do you provide with the material?
We provide full traceability and a EN 10204 3.1 Material Test Certificate with every shipment. This certificate independently verifies that the material's chemical composition and mechanical properties conform to the EN 10305-1 E215 standard.
8. How does EN 10305-1 E215 compare to DIN 2391 St34?
EN 10305-1 is the modern successor to DIN 2391. While the steel grades are similar, the EN standard typically enforces stricter and more comprehensive requirements for dimensional tolerances and testing, ensuring a higher and more consistent level of product quality and reliability.
9. Is the internal surface protected during shipping?
Yes. We understand the critical importance of the honed ID. All our honed tubes are thoroughly cleaned, oiled, and fitted with plastic end caps to prevent contamination and damage during transit and storage.
10. What is your lead time for this product?
We maintain a strategic stock of popular sizes to ensure quick turnaround. Lead times for custom orders vary based on quantity and specifications. Please contact our sales team for a precise lead time based on your requirements.
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