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| Place of Origin | CHINA |
| Brand Name | JOYRUNS |
| Certification | ISO9001 |
| Model Number | 6MM TO 140MM |
Standard: JIS G4051 | Grade: S45C | Condition: Cold Drawn/Annealed | OD Range: 3mm – 120mm
As a professional manufacturer and supplier of precision steel tubes, we offer high-quality JIS G4051 S45C seamless tubes specifically engineered for automotive bushing applications. Our S45C tubes are cold drawn and thermally treated to deliver the optimal balance of strength, machinability, and wear resistance required for suspension bushings, engine mount sleeves, and chassis components.
Manufactured in strict compliance with JIS G4051 standard (Carbon steels for machine structural use), our S45C material is the preferred choice for Japanese automotive OEMs and Tier 1 suppliers worldwide, particularly for rubber-to-metal bonded components requiring precise dimensional control and consistent mechanical properties .
| Parameter | Specification |
|---|---|
| Standard | JIS G4051 |
| Steel Grade | S45C (JIS) |
| Product Type | Seamless Cold Drawn Precision Tube |
| Size Range (OD) | 3 mm – 120 mm |
| Wall Thickness | Customizable upon request |
| Delivery Condition | Annealed / Stress Relieved / Cold Drawn |
| Surface Finish Options | Black, Bright, Phosphated (for rubber bonding) |
The following chemical composition is in accordance with JIS G4051 requirements for S45C :
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.42 – 0.48 |
| Silicon (Si) | 0.15 – 0.35 |
| Manganese (Mn) | 0.60 – 0.90 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.035 |
| Nickel (Ni) | ≤ 0.20 |
| Chromium (Cr) | ≤ 0.20 |
| Copper (Cu) | ≤ 0.30 |
*Note: Ni + Cr ≤ 0.35% maximum according to JIS G4051 specifications . Actual mill test certificates (MTC) are provided with each shipment to ensure full traceability.*
Our S45C tubes deliver consistent mechanical performance ideal for structural automotive components. S45C is a medium carbon steel where the number "45" indicates a representative carbon content of 0.45% .
| Property | Annealed Condition | Quenched & Tempered Condition |
|---|---|---|
| Tensile Strength | ≥ 570 MPa | ≥ 690 MPa |
| Yield Strength | ≥ 345 MPa | ≥ 490 MPa |
| Elongation | ≥ 20% | ≥ 17% |
| Reduction of Area | ≥ 45% | — |
| Impact Energy | ≥ 33 J/cm² | — |
| Hardness | 167 – 269 HBW | 201 – 269 HBW |
Note: The annealed condition is typically supplied for bushing manufacturing to ensure optimal machinability .
To ensure optimal machinability and formability for bushing production, our S45C tubes are supplied in the annealed condition. The standard heat treatment processes for S45C are as follows :
| Heat Treatment | Temperature Range | Cooling Method |
|---|---|---|
| Annealing | Approx. 810°C | Furnace cooling |
| Normalizing | 820 – 870°C | Air cooling |
| Quenching | 820 – 870°C | Water cooling |
| Tempering | 550 – 650°C | Rapid cooling |
Note: Rapid cooling after tempering is necessary to avoid temper brittleness .
We can customize the heat treatment condition (normalized, quenched & tempered, or stress relieved) based on your final application requirements.
S45C is a high-quality medium-carbon steel (fully killed steel manufactured by electric furnace, open hearth, or pure oxygen converter) with uniform metallurgical structure and no structural defects . It offers the following benefits for automotive bushing manufacturing:
| Feature | Benefit |
|---|---|
| High Strength | With a minimum yield strength of 345 MPa (annealed), it withstands high loads in suspension and chassis systems . |
| Excellent Machinability | Ideal for high-volume CNC machining of bushings, sleeves, and spacers. Spheroidizing treatment can further improve machinability . |
| Good Wear Resistance | Medium carbon content (0.42-0.48%) provides excellent natural wear resistance for dynamic applications . |
| Consistent Hardness | Annealed condition ensures uniform machining and extended tool life . |
| Surface Finish Options | Available with phosphate coating or sandblasting (SA 2.5) for enhanced rubber-to-metal bonding during vulcanization . |
| Dimensional Stability | Excellent resistance to deformation and cracking during service . |
Our JIS G4051 S45C tubes are widely used in the following applications:
Suspension Bushings – Inner and outer sleeves for rubber/metal bonded bushings in control arms, stabilizer links, and engine mounts
Engine Mount Sleeves – Precision spacers for vibration dampening systems
Chassis Components – Structural sleeves and collars
Hydraulic Cylinders – Medium-duty cylinder barrels
Shafts & Gears – Axles, spindles, piston rods, and gear components
Fasteners – Bolts, nuts, screws, and connecting rods
S45C is the Japanese standard grade that corresponds to the following international specifications :
| Country/Region | Standard | Grade |
|---|---|---|
| USA | AISI/SAE | 1045 |
| Germany | DIN | C45 / CK45 (1.0503 / 1.1191) |
| China | GB | 45 |
| Taiwan | CNS | S45C |
| UK | BS | 080A47 / IC45 |
| International | ISO | C45E4 |
| France | AFNOR/NF | CC45 / C45 |
| Sweden | SS | 1650 |
Full Traceability: Mill test reports (EN 10204 3.1) included with every order.
Custom Sizes: Available from 3mm to 120mm OD, cut to your exact length requirements.
Surface Options: Black, bright polished, or phosphate coated (for rubber bonding) .
Strict Tolerances: Capable of H8/H8 tolerance with concentricity ≤ 0.05mm and surface roughness Ra ≤ 1.6μm for precision bushing applications .
Global Shipping: Reliable export packaging and fast delivery worldwide.
Contact our technical sales team today for pricing, stock availability, or free samples.
[Contact Sales] | [Request Mill Test Certificate Sample] | [Download Technical Datasheet (PDF)]
Q: Is S45C the same as SAE 1045 or CK45?
A: Yes, S45C is the Japanese standard equivalent to American SAE 1045 and European CK45 (1.1191) / C45 grades .
Q: What is the meaning of "45" in S45C?
A: The number "45" in S45C represents a carbon content of approximately 0.45% (specifically 0.42-0.48%) . As carbon content increases, strength (yield stress) increases, while toughness (impact resistance) tends to decrease .
Q: Can these tubes be used for rubber-to-metal bonding?
A: Absolutely. We can supply tubes with phosphate-coated (zinc or manganese phosphate, 2-5μm) or sandblasted (SA 2.5) surface finishes to enhance rubber adhesion for bonded bushing applications with elastomers such as EPDM, NBR, and VMQ .
Q: What is the minimum order quantity (MOQ)?
A: We offer flexible quantities. Please inquire for specific requirements.
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