Honed tube and hydraulic steel tube
Honed cylinder tube with bore Ø40-Ø350 and H8 tolerance, and hydraulic line tube from 5×1 to 42×4.
The inner surface of the tube that forms the cylinder barrel is the surface the piston seal runs on: a rough or out-of-round tube makes even the best seal leak. We supply the honed tube we use in our own cylinders and the hydraulic tube we use in circuit lines, cut to length. We ship honed tube and hydraulic tube from stock anywhere in Türkiye and abroad, and also sell them through our online store hidroticaret.com (Turkish).
Types
Hydraulic line tube
Seamless precision steel tube for the fixed lines from pump to valve and from valve to cylinder; connected with compression fittings.
Honed cylinder tube
Tube with H8 tolerance whose bore is finished on a honing machine with a cross-hatch pattern; it lets the piston slide smoothly and helps the oil film hold.
Product images: hidroticaret.com.
How to select
Honed tube size is given as inside diameter × outside diameter (for example 80 × 95). The inside diameter determines the force the cylinder will produce, the wall thickness the pressure it can withstand. Plain drawn tube cannot be used in place of honed tube: the roughness of the bore cuts the seal the first time it runs.
Cylinder force is the product of pressure and piston area; the table below gives the push force by bore. In the pull direction the force is smaller, because the rod cross-section is subtracted.
Unlike hose, hydraulic tube does not whip with vibration and lasts much longer; it is preferred on fixed lines. Its size is given as outside diameter × wall thickness (for example 16 × 2); the fitting is selected by the outside diameter. The tube size is selected by the flow that will pass through the line.
Push force by cylinder bore
| Bore | 100 bar | 160 bar | 250 bar |
|---|---|---|---|
| Ø40 mm | 12.6 kN | 20.1 kN | 31.4 kN |
| Ø50 mm | 19.6 kN | 31.4 kN | 49.1 kN |
| Ø63 mm | 31.2 kN | 49.9 kN | 77.9 kN |
| Ø80 mm | 50.3 kN | 80.4 kN | 125.7 kN |
| Ø100 mm | 78.5 kN | 125.7 kN | 196.3 kN |
| Ø125 mm | 122.7 kN | 196.3 kN | 306.8 kN |
| Ø160 mm | 201.1 kN | 321.7 kN | 502.7 kN |
| Ø200 mm | 314.2 kN | 502.7 kN | 785.4 kN |
Calculation: force = pressure × piston area. This is a theoretical value; seal friction reduces the actual force slightly.
Flow rate by hydraulic tube size
| Tube (OD x wall) | Inside diameter | 3 m/s (return line) | 5 m/s (pressure line) |
|---|---|---|---|
| 6 x 1 | 4 mm | 2.3 L/min | 3.8 L/min |
| 8 x 1 | 6 mm | 5.1 L/min | 8.5 L/min |
| 10 x 1.5 | 7 mm | 6.9 L/min | 11.5 L/min |
| 12 x 1.5 | 9 mm | 11.5 L/min | 19.1 L/min |
| 16 x 2 | 12 mm | 20.4 L/min | 33.9 L/min |
| 20 x 2 | 16 mm | 36.2 L/min | 60.3 L/min |
| 25 x 2.5 | 20 mm | 56.5 L/min | 94.2 L/min |
| 30 x 3 | 24 mm | 81.4 L/min | 135.7 L/min |
| 38 x 4 | 30 mm | 127.2 L/min | 212.1 L/min |
| 42 x 4 | 34 mm | 163.4 L/min | 272.4 L/min |
Calculation: flow rate = flow velocity × internal cross-sectional area. The velocities are common design values; the pressure rating of the tube is checked separately against its wall thickness and material.
Frequently asked questions
How do I read a honed tube size?
As inside diameter × outside diameter: 80 × 95 means a tube with an 80 mm bore and a 95 mm outside diameter; the wall thickness is 7.5 mm.
Can ordinary tube be used instead of honed tube?
No. A tube with an unfinished bore cuts the piston seal in a short time; a cylinder tube must be honed.
Which fitting goes on hydraulic tube?
A DIN 2353 compression fitting matching the tube outside diameter: a 16 mm fitting for 16 × 2 tube. The light or heavy series is selected by the line pressure.
Hydraulic tube or hose?
On fixed, stationary lines tube lasts longer and does not vibrate; connections that move or vibrate need hose.
Do you cut the tube to length?
Yes. Inside diameter, outside diameter and length are all we need.
Stock, sizes and part numbers
Sizes in stock, manufacturer part numbers and brands are kept up to date in our catalog. Send us your requirement on WhatsApp or by e-mail and we will quote and ship worldwide.
Honed tube and hydraulic steel tube in the catalog Online store (Turkish) →