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For engineers and procurement specialists seeking superior hydraulic and pneumatic cylinder components, the EN 10305-1 E255 Honed Seamless Steel Tube represents the pinnacle of precision and performance. This seamless steel tube is meticulously manufactured to the stringent EN 10305-1 standard, guaranteeing exceptional dimensional accuracy and consistent wall thickness. The E255 grade offers an ideal balance of strength and machinability, while the final honed ID finish provides an exceptionally smooth, wear-resistant surface-ready for immediate assembly to minimize friction and maximize the service life of your critical applications.
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Products Description
| 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 |
Products Description
| 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 | |||||
FAQ: EN 10305-1 E255 Honed Seamless Steel Tube
1. What is the primary application for EN 10305-1 E255 Honed Tubes?
E255 honed tubes are primarily used in the manufacturing of hydraulic and pneumatic cylinders, where the internal surface acts as the bearing surface for pistons and seals. They are also ideal for material handling equipment, automotive shock absorbers, and other applications requiring a seamless tube with a precise, smooth internal finish.
2. What does the "E255" designation specify?
The "E255" designation refers to the steel grade as per EN 10305-1. It specifies a minimum yield strength of 255 MPa, ensuring a robust yet readily weldable and machinable material that provides an excellent balance of strength and formability for cylinder applications.
3. What are the key advantages of a honed ID (Internal Diameter) finish?
The honing process creates a cross-hatched surface pattern on the tube's ID that is exceptionally smooth. This minimizes friction and wear on seals and pistons, improves lubrication retention, and allows for immediate assembly without further internal machining, reducing production time and cost.
4. How does a seamless tube (CDS) benefit my cylinder design compared to a welded tube?
Seamless tubes (Cold Drawn Seamless - CDS) have a homogeneous structure with no longitudinal weld seam. This eliminates a potential point of failure, ensures uniform mechanical properties and hardness around the entire circumference, and provides superior concentricity and pressure integrity for high-performance and safety-critical applications.
5. What dimensional tolerances can we expect with EN 10305-1 E255 tubes?
EN 10305-1 specifies very tight tolerances. For E255 honed tubes, you can expect exceptional dimensional consistency on outer diameter (h9 or better), wall thickness (often to tolerance class E3), and straightness. This guarantees reliable performance and simplifies the assembly process.
6. Is the E255 grade suitable for welding?
Yes, the E255 grade is known for its excellent weldability. Its low carbon equivalent value allows it to be easily welded using all standard methods without pre- or post-heating under normal conditions, making it ideal for constructing cylinder barrels and other welded structures.
7. What surface roughness (Ra) is typically achieved on the honed ID?
A standard honed finish typically achieves a surface roughness (Ra) value between 0.2 µm and 0.8 µm. We can provide tubes with specific Ra values tailored to your application requirements, ensuring optimal seal performance and service life.
8. Are these tubes supplied ready-to-use?
Yes, our EN 10305-1 E255 honed tubes are supplied as finished, ready-to-use components. They are cleaned, degreased, and often capped to protect the pristine internal surface during shipping and handling, allowing for direct integration into your production line.
9. Can you provide custom lengths, diameters, and wall thicknesses?
Absolutely. While we stock a range of standard sizes, we specialize in supplying custom-cut lengths and can source tubes to meet specific OD and WT requirements outside standard ranges. Please contact our technical sales team with your specifications.
10. How does EN 10305-1 compare to other standards like DIN 2391 or ASTM A513?
EN 10305-1 is the modern European standard that supersedes parts of DIN 2391, offering more precise and comprehensive specifications for precision steel tubes. While ASTM A513 covers similar electric resistance welded (ERW) tubing, EN 10305-1 E255 is a seamless grade, providing the inherent strength and reliability advantages of a seamless construction for demanding hydraulic applications.
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