What Is a Honed Tube and Its Uses

Honed tubes play a crucial role in hydraulic and pneumatic systems, yet many engineers and buyers still ask: What exactly is a honed tube, what is it used for, and how is it produced?

What Is a Honed Tube?

A honed tube is a steel tube whose inner surface has been precision machined by honing to achieve a smooth finish and tight dimensional tolerances. Honed tubes are primarily used as cylinder barrels for hydraulic and pneumatic cylinders, where the smooth movement of the piston is critical.

Key Features

High inner surface precision (tolerance class H8 or H9)

Low surface roughness (Ra ≤ 0.2~0.4 µm)

Excellent roundness and straightness

Improves sealing performance and reduces wear

Ready-to-use for hydraulic cylinders—no further boring required

Common Materials

Honed tubes are typically made from high-strength, machinable steel grades such as:

ST52 / E355 (DIN/EN standard)
SAE 1020 / 1045
20# or 45# carbon steel
27SiMn (for high-pressure or heavy-duty cylinders)

How Are Honed Tubes Made?

The production process includes several precision steps:

Raw Tube Selection – Cold-drawn or hot-rolled seamless steel tube
Pre-machining – Straightening and cutting
Boring or Skiving – Rough internal sizing
Honing – High-precision polishing of the inner surface
Inspection – Checking ID tolerance, roughness, straightness, concentricity
Cleaning, Oil Coating & Packing – To prevent rust and ready for delivery

Applications of Honed Tubes

Honed tubes are used wherever smooth, high-pressure linear motion is needed:

Hydraulic cylinders (excavators, cranes, loaders)
Pneumatic cylinders
Injection molding machines
Press machines & heavy equipment
Mining and marine hydraulics
Industrial automation

Why Choose Honed Tubing Over Raw Steel Pipe?

Feature	Raw Steel Pipe	Honed Tube

Inner surface finish

Rough

Polished, smooth

Piston seal wear

High

Minimal

Additional machining

Required

Not required

Straightness

Variable

Strictly controlled

Looking for a Reliable Honed Tube Supplier?

We supply high-quality honed tubes with competitive pricing and fast delivery. Custom lengths, bore sizes, and material grades are available on request. Contact us for a quote or technical support—we’re here to help.