TORICH INTERNATIONAL LIMITED
| Payment Terms | L/C,D/A,D/P,T/T,Western Union |
| Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-30days upon products |
| Packaging Details | Box |
| Application | Automobile |
| Outer diameter(round) | 50- 245 mm, |
| Thickness | 2 - 50 mm, |
| Standard | ASTM,DIN,GB,JIS,API |
| Technique | Cold Drawn,Hot Rolled,Cold Rolled,ERW,Hot Rolled/Cold Drawn |
| Grade | 45#,20#,16Mn,10#,Q345 |
| Section shape | Round,Rectangular |
| Length | 6M or as requirement,As customer's require,8m,5.8m,2.5-8m |
| Brand Name | TORICH |
| Model Number | Honed Hydraulic Cylinder Tubing |
| Certification | ISO9001 ISO 14001 TS16949 |
| Place of Origin | Zhejiang/China |
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Product Specification
| Payment Terms | L/C,D/A,D/P,T/T,Western Union | Supply Ability | 60000 Ton/Tons per Year |
| Delivery Time | 20-30days upon products | Packaging Details | Box |
| Application | Automobile | Outer diameter(round) | 50- 245 mm, |
| Thickness | 2 - 50 mm, | Standard | ASTM,DIN,GB,JIS,API |
| Technique | Cold Drawn,Hot Rolled,Cold Rolled,ERW,Hot Rolled/Cold Drawn | Grade | 45#,20#,16Mn,10#,Q345 |
| Section shape | Round,Rectangular | Length | 6M or as requirement,As customer's require,8m,5.8m,2.5-8m |
| Brand Name | TORICH | Model Number | Honed Hydraulic Cylinder Tubing |
| Certification | ISO9001 ISO 14001 TS16949 | Place of Origin | Zhejiang/China |
| High Light | Automotive Application Honed Hydraulic Cylinder Tubing ，ISO H8/H9 ID Tolerance Precision Cold Drawn Seamless Tube ，Ra max 0.40 μm Hydraulic Cylinder Tube | ||
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.
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).
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.
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).
| Grade | Standard reference | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|---|
| E235 | EN 10305-1 | ≤0.17 | ≤0.35 | ≤1.20 | ≤0.025 | ≤0.025 |
| E355 | EN 10305-1 | ≤0.22 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.025 |
| St52 | DIN 2391 | ≤0.22 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.025 |
| 1020 | ASTM A519 | 0.18–0.23 | — | 0.30–0.60 | ≤0.040 | ≤0.050 |
| 1025 | ASTM A519 | 0.22–0.28 | — | 0.30–0.60 | ≤0.040 | ≤0.050 |
| Grade | Typical delivery condition | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| E235 | +SR (stress relieved) | ≥350 | ≥420 | ≥16 |
| E355 | +SR (stress relieved) | ≥450 | ≥580 | ≥10 |
| St52 | BK+S / +SR (stress relieved) | ≥420 | 580–740 | ≥10 |
| 1020 | Stress relieved (SR), typical | ~345 (50 ksi) | ~448 (65 ksi) | ~10 |
| 1025 | Stress relieved (SR), typical | ~483 (70 ksi) | ~586 (85 ksi) | ~10 |
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).
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).
A: manufacturer,also can do trading.
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.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
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.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller
Year Established:
1997
Total Annual:
25000000-30000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Company Overview A Professional Steel Tube Manufacturer and Solution Provider TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat... Company Overview A Professional Steel Tube Manufacturer and Solution Provider TORICH INTERNATIONAL LIMITED integrates steel tube manufacturing, international trade, warehousing, technical support and customized processing. Our manufacturing operations cover cold drawing, cold rolling, heat treat...
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