As a leading supplier of precision steel tubing, we specialize in JIS G 3473 honing tubes, also widely known as honed tubes or honed pipes. This product is engineered to deliver the superior surface finish, tight dimensional tolerance, and exceptional straightness required for reliable hydraulic and pneumatic cylinder applications. Recognized globally under various standards such as DIN 2391-1 / ST 52.4 E in Europe, ASTM A513 in North America, and its common designation as STKM 13C, our honing tubes-including the advanced skived and roller burnished tubes-guarantee optimal performance, reduced friction, and extended seal life for your most demanding industrial machinery.
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Products Description
Product Standard: JIS G 3473
Steel Grade/Mark: STKM 13C, STKM 12C
Other Names/Processes: Honed Tube, Hydraulic Cylinder, Precision Cylinder, Skived and Rolled Tube, Cold-Drawn Honed Tube
Main Applications: Hydraulic Cylinders, Pneumatic Cylinders, Injection Molding Machines, Construction Machinery, Automotive Manufacturing
Core Advantages: Mirror-like Interior Finish, High Dimensional Accuracy, Excellent Straightness and Roundness
Alternative Standards: DIN 2391-1, EN 10305-1, ASTM A513, GB/T 3639
Chemical composition and Mechanical properties of JIS G3473
|
Steel Grade |
C max |
Si max |
Mn max |
P max |
S max |
|
STC 370 |
0.25 |
0.35 |
0.3-0.90 |
0.04 |
0.04 |
|
STC 440 |
0.25 |
0.35 |
0.30-0.90 |
0.04 |
0.04 |
|
STC 510 A |
0.25 |
0.35 |
0.30-0.90 |
0.04 |
0.04 |
|
STC 510 B |
0.18 |
0.55 |
1.5 |
0.04 |
0.04 |
|
STC 540 |
0.25 |
0.55 |
1.6 |
0.04 |
0.04 |
|
STC 590 A |
0.25 |
0.35 |
0.30-0.90 |
0.04 |
0.04 |
|
STC 590 B |
0.25 |
0.35 |
1.5 |
0.04 |
0.04 |
MECHANICAL PROPERTIES
|
MECHANICAL PROPERTIES min |
|||
|
Steel grade |
Tensile strength Mpa |
Yeild point or proof stress Mpa |
Elongation % |
|
STC 370 |
370 |
251 |
30 |
|
STC 440 |
440 |
305 |
10 |
|
STC 510 A |
510 |
380 |
10 |
|
STC 510 B |
510 |
380 |
15 |
|
STC 540 |
540 |
390 |
20 |
|
STC 590 A |
590 |
490 |
10 |
|
STC 590 B |
590 |
490 |
15 |
What is JIS G 3473 Honed Tube?
JIS G 3473 STKM 13C carbon steel tubing for precision mechanical structures is the preferred material for manufacturing high-performance hydraulic and pneumatic cylinders. Through advanced cold drawing and honing or skiving and roller burning processes, we achieve a near-mirror-like inner bore surface finish with exceptional dimensional consistency and straightness.
Why Choose Our Honed Tube?
Excellent Surface Quality: Internal surface roughness can reach Ra ≤ 0.4 μm or even lower, effectively reducing friction and wear, significantly extending the service life of seals and the entire system.
Precise Geometric Dimensions: Strict tolerance control (outer diameter, wall thickness, and roundness) ensures a perfect fit with pistons and seals, eliminating internal leakage and sticking.
Excellent Mechanical Properties: Cold work hardening provides the material with enhanced strength and pressure resistance, ensuring safe and reliable operation under high-pressure conditions.
No Internal Machining Required: It arrives ready for cylinder block manufacturing, saving you the cost and time of expensive boring and honing processes.
Technical Specifications & Data
| Parameter | Specification Details | ||
|---|---|---|---|
| Standard | JIS G 3473 | ||
| Material Grade | STKM 13C (Most Common), STKM 12C | ||
| Chemical Composition | C, Si, Mn, P, S, etc., strictly conforming to JIS standard for optimal weldability and strength. | ||
| Mechanical Properties | Tensile Strength ≥ 410 MPa, Yield Strength ≥ 245 MPa (STKM 13C) | ||
| Size Range | • Outer Diameter (O.D.): 20mm - 400mm • Wall Thickness (W.T.): 2mm - 25mm • Length: Up to 12 meters, custom lengths available. |
||
| Inner Surface Roughness | Standard: Ra ≤ 0.8 μm | Precision: Ra ≤ 0.4 μm | Custom specifications available. |
| Tolerances | • O.D. Tolerance: ±0.10mm to ±0.40mm • W.T. Tolerance: ±10% or tighter • Straightness: ≤ 0.5 mm / meter |
||
| Heat Treatment | Typically supplied as Hard Drawn or Stress Relieved (SR). |
Applications
Construction Machinery: Hydraulic cylinders for excavators, cranes, and loaders.
Industrial Equipment: Hydraulic systems for injection molding machines, die-casting machines, and machine tools.
Automotive Industry: Truck tipping cylinders, shock absorbers.
Agricultural Machinery: Lift and steering cylinders for tractors and harvesters.
Material Handling: Forklifts, lifting platforms.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between a honing tube and a standard seamless tube?
A: The key difference is the internal surface quality. Honing tubes are precision-finished inside to a mirror-like surface and tight tolerances, making them "ready-to-use" as cylinder barrels. Standard seamless tubes require expensive and time-consuming internal machining before they can be used.
Q2: Can your JIS G 3473 tube replace DIN 2391-1 ST52.4?
A: Absolutely. JIS G 3473 STKM 13C is a globally recognized and proven equivalent to DIN 2391-1 ST52.4, with nearly identical chemical and mechanical properties. It is successfully used in equipment exported to Europe and worldwide.
Q3: Do you offer custom sizes and materials?
A: Yes. We can produce custom O.D., W.T., and length according to your drawings. We can also supply tubes in alloy steel grades for higher strength requirements.
Q4: What is your Minimum Order Quantity (MOQ)?
A: We are flexible and can accommodate small trial orders as well as large-volume contracts. Let us know your needs, and we will find a solution.
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