SAE 4130 / 4140 / 4145 / 4340 / 8620 Cold Drawn Seamless Alloy Steel Mechanical Tubing
Product Overview
Alloy steel cold drawn seamless mechanical tubing is a precision-engineered tube widely used in hydraulic cylinder components, automotive parts, engineering structures, and heavy-duty machinery. Produced under ASTM A519standards, it ensures high strength, dimensional accuracy, and excellent machinability—ideal for SAE 4130 cold drawn hydraulic cylinder tubes, customized SAE 4140 cylinder parts, and high-performance assemblies.
Product Name
SAE 4130 / 4140 / 4145 / 4340 / 8620 Cold Drawn Seamless Alloy Steel Mechanical Tubing
Key Applications
Hydraulic cylinder tubes (including cold drawn and honed cylinder barrels)
Custom hydraulic cylinder parts (e.g. SAE 4130 or 4140 rod, barrel, sleeve)
Precision bushings, spacers & fittings
Heavy-duty automotive, mining & industrial machinery components
Standard Specifications
Available Alloy Steel Grades
Carbon Steel Grades: SAE 1010, 1020, 1026, 1045, 1518, 1524, 1541
Alloy Steel Grades:
SAE 4130 (ideal for hydraulic cylinder barrels and aircraft parts)
SAE 4140 (widely used for high-strength cylinder tubes)
SAE 4145, 4340, 8620
BS Grades: CFS3 – CFS11
DIN/EN Grades: ST35, ST45, ST52, E235, E355, C45E, 25CrMo4, 42CrMo4
Size Range
Parameter | Range |
|---|
Outer Diameter | Up to 356 mm |
Inner Diameter | Up to 300 mm |
Wall Thickness | Customized on request |
Manufacturing Process
Cold Drawn
Cold Rolled
Hydraulic Cold Drawing (for tight tolerance and seamless finish)
We also provide precision CNC machining and customized part fabrication for AISI 4130 hydraulic cylinder parts and SAE 4130 / SAE 4140 customized cylinder parts based on customer drawings.
Delivery Conditions
Symbol | Description |
|---|
BK | Cold finished |
BKW | Cold drawn (soft) |
BKS | Stress relieved |
GBK | Annealed |
NBK | Normalized |
Q+T | Quenched and Tempered |
End Finish Options
Export Packaging
Bundled with steel straps
Internal and external oil coated
Plastic end caps
Wrapped with PVC and woven bags for sea transport
Custom labeling and wooden crates available
Why Choose Our SAE Alloy Steel Tubes?
✅ High-strength cold drawn tubes
✅ Excellent surface finish & dimensional control
✅ Suitable for hydraulic cylinder machining
✅ Custom CNC turning, honing & skiving service
✅ Global export experience with OEM clients
FAQ – SAE 4130 / 4140 Mechanical Tubing
Q1: What’s the MOQ?
A: 3–5 tons/size for carbon steel; 10–20 tons/size for alloy grades like SAE 4130 or 4140.
Q2: What’s the production lead time?
A: Carbon steel: 20–30 days. Alloy steel (SAE 4140 / 4340): 30–50 days.
Q3: Do you offer warranty?
A: Yes, 6-month product warranty after shipment. On-site customer inspection is welcomed before delivery.
Q4: What payment terms are supported?
A: T/T, L/C, D/P available depending on buyer credit rating.
Q5: How do you manage quality?
A:
Raw materials sourced from certified steel mills
In-house inspection during each stage of manufacturing
Final dimensional & material test reports provided
Company Profile
We are a trusted Chinese manufacturer of cold drawn, cold rolled, and hydraulic cold drawn steel tubes, specializing in custom alloy steel mechanical tubing for hydraulic systems. Established in 2002, our production base spans 32,000m²with:
12 workshops
2 hydraulic cold drawing benches
4 chain cold drawing lines
2 ERW tube mills
In-house machining, honing, cutting & CNC turning capabilities
Our tubes are supplied to customers worldwide, including well-known hydraulic cylinder OEMs and engineering companies.
