Honed Hydraulic Cylinder Tubing — Precision Cold-Drawn Seamless Tube for Automotive

Material

Honed hydraulic cylinder tubing is a precision cold-drawn seamless steel tube whose inside diameter (ID) is honed or skived & roller burnished (SRB) to achieve tight dimensional tolerances and a very smooth bore—critical for hydraulic cylinders where sealing performance, friction, and service life depend heavily on ID quality.

Typical steel families include EN precision grades (E235 / E355), DIN precision grades (St52), and ASTM mechanical tubing grades (SAE 1020 / 1025), selected based on required strength, machinability, and fatigue performance.

Specifications

• Base tube process: Seamless, cold-finished / cold-drawn mechanical or precision tubing; stress relief and sizing per order.

• Inside processing: Honed or skived & roller burnished, commonly to ISO H8 / H9 ID tolerance.

• Typical size window : OD Ø50–245 mm, ID Ø40–200 mm (other sizes by agreement).

• Surface roughness (ID):

  • SRB: Ra max 0.30 μm

  • Honed: Ra max 0.40 μm

• Straightness (example guidance): local deviation max 1 mm / 1000 mm.

• Length supply: mill/random lengths or cut-to-length (common hydraulic tube programs include ~5–8 m).

Key Features

• Ready-to-machine / ready-to-assemble bore: ISO H8/H9 ID tolerance and controlled Ra reduce seal wear and minimize leakage risk.

• Optimized cylinder performance: Honing can create a cross-grinding pattern; combined with low roughness, it helps reduce friction effects and extend component life.

• Automotive-grade consistency: Seamless construction and controlled chemistry/mechanics support repeatable machining and stable performance in motion-control components.

Our Advantages

1) “What ID tolerance and Ra can you actually deliver for cylinder bores?”
We supply honed/SRB tubing commonly to ISO H8 or H9 ID tolerance with Ra up to 0.40 μm (honed) or Ra up to 0.30 μm (SRB), matching typical cylinder-tube technical sheets used in the market.

2) “How do you control the inside surface to avoid scoring, pits, and seal damage?”
Inside surface quality is treated as a critical-to-function requirement. ASTM A519 describes an optional requirement for tubing where the inside surface is of prime importance and no stock removal is intended, noting that special processing/selection may be needed to meet the required surface. We align our inspection plan accordingly (bore visual checks, roughness verification, dimensional gauging; and NDT can be agreed when required).

3) “Can you provide traceability, certificates, and shipping protection for long-distance supply?”
We support full traceability with heat/lot documentation and can provide EN 10204 3.1 / 3.2 certificates when specified. Packaging and storage guidance is treated as part of delivery quality (dry covered storage, careful lifting/handling, and protection of finished surfaces).

Chemical Composition

Mechanical Properties

Standards & Compliance

• ASTM: ASTM A519/A519M — Seamless carbon/alloy steel mechanical tubing (hot-finished or cold-finished).

• EN: EN 10305-1 (seamless cold-drawn precision tubes), commonly used for E235/E355 cylinder tubes.

• DIN: DIN 2391 — Seamless precision steel tubes (St52 commonly referenced in the cylinder-tube market).

• GOST: GOST 8734 / GOST 8733 — Seamless cold-formed/drawn tubes and technical requirements (commonly referenced for CIS markets).

• JIS: JIS G3445 — Carbon steel tubes for machine structural purposes (common in machinery/automotive supply chains).

• GB: GB/T 3639 — Cold drawn/cold rolled precision seamless steel tubes (widely used for mechanical, hydraulic, and auto parts).

Application Areas

Main sectors: hydraulic & pneumatic cylinders, precision machinery, automotive components, and industrial motion control.

Where it is used (examples):

• Automotive & commercial vehicles: hydraulic cylinder barrels for lifting/tipping systems, service equipment cylinders, and actuator sleeves where a high-quality ID is needed.

• Automotive manufacturing equipment: hydraulic cylinders in stamping lines, clamping systems, and test rigs—benefiting from H8/H9 bores and controlled Ra.

• General hydraulics: cylinder barrels for presses, material handling, and heavy-duty actuators (honed or SRB).

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.