SUP7 SUP9A SUP10 SUP11A 5160 Spring Steel Flat Bar for Leaf Spring
- 20+ Years of experiences (since 1999)
- Implementing ISO 9001-2015
- Annual output (tons): 1,800,000+
- Warranty: 18 months since shipping date
- Market shares: 50%+ in China
- Material characteristics: With excellent comprehensive property, high tensile strength and fatigue limit, high elastic limitation and yield ratio, but also has excellent plasticity and toughness.At the same time, it also has the favorable hardenailty and the surface quality.Moreover, it has favorable cold working performance and heat treatment technology property.
Dispatch within Customized Production Based on Your Requirements : Your order will be manufactured according to your specifications (size, material, usage, etc.) with professional engineering support..- Lead Time: 3–60 Days Depending on Quantity and Specification Warranty: Production and delivery time may vary based on your order volume and customization details. Contact us for an accurate schedule.
Description
Premium Spring Steel Flat Bar for Durable Leaf Springs
At WONDEE, we prioritize the performance and safety of suspension systems by delivering high-quality spring steel flat bars designed for heavy-duty use. We focus on producing durable and resilient bars in popular grades such as SUP7, SUP9A, SUP10, SUP11A, and 5160 Spring Steel, ensuring they perform reliably in automotive and industrial applications.
We follow strict quality standards throughout our manufacturing process and apply our deep industry knowledge to every order. By consistently offering dependable materials with high yield strength and excellent toughness, we’ve earned long-term trust from partners across global markets.
Applications and Features
Applications
Spring steel is a versatile material known for its ability to withstand significant bending and twisting forces while returning to its original shape. It is a go-to choice for a wide range of products, including various types of springs, steering arms for air suspension, and even tools like saw blades. The high-performance characteristics of our steel make it especially suitable for automotive leaf springs, vehicle coil springs, and s-tines, where strength and fatigue resistance are paramount.
For more about WONDEE’s expertise in manufacturing leaf springs, please click the image below:
Features
| Services quality management system | Implementing ISO9001-2015 |
| Product technical standard | Implementing GB/T 33164.1-2016, JIS, DIN, ASTM |
| Thickness tolerance | ±0.50 mm |
| Thickness tolerance | ±0.80 mm |
| Side bending | ≤0.25% |
| Plane bending | ≤0.50% |
| Hardness/HBW | ≤360 |
| Surface quality: | All thickness Max defect depth: 0.15mm |
| Sales volume (tons) | 1,800,000+ |
| Warranty | 18 months since shipping date |
Comprehensive Info of Spring Steel Flat Bar:
| Land area (square meters) | 2,800,000+ |
| Sales volume (tons) | 1,800,000+ |
| Number of employees | 8000+ |
| Technical professionals | 1200+ |
| Market shares | 50%+ in China |
| Overseas market | It takes more than 30% of total quantity of the spring steel flat bar imports in the countries of Southeast Asia, Sout America, North Africa and so on. |
| Available certificates | COC; PVOC; CIQ; SONCAP; BV; C/O; FORM E. |
| Executive standards | GB, JIS, DIN, ASTM and technical agreement. (GB/T 33164.1-2016; JIS G 4801：2011; EN 10089：2002; EN 10092-1-2003; ASTM A322;ASTM A304-04; SAE J1268；SAE J404). |
| Grades of spring steel flat bar | 60Si2Mn; 50CrV; 55CrMn; 55SiMnVB;60CrMn;28SiMnB;51CrMnV; 52CrMnMoV; 60Si2CrV; 60CrMnB; 55SiMnVB; 50CrVA 55CrMnA; 60CrMnA; 28MnSiB; 60CrMnBA; SUP7; SUP9; SUP9A; SUP10; SUP11A; 55Cr3; 51CrV4; 61SiCr7; 52CrMoV4; 5160; 5160H; 6150; 6150H; 51B60; 51B60H; SAE5160; SAE5160H; SAE6150; SAE6150H; SAE51B60; SAE51B60H; 52CrMnBA; 50CrMnVA; FAS3550; NHS3. |
| Width x thickness | 44.5×6; 44.5×8; 45×6; 45×8; 50×6; 50×7; 50×8; 50×9; 50×13; 60×6; 60×7; 60×8; 60×9; 60×10; 60×12; 60×14; 70×6; 70×7; 70×8; 70×9; 70×10; 70×11; 70×12; 70×13; 70×14; 70×6; 75×10; 75×1 1; 75×12; 75×13; 75×14; 75×15; 75×16; 75×18; 75×10; 75×11; 80×10; 80×11; 80×12; 80×13; 80×14; 90×10; 90×11; 90×12; 90×13; 90×14; 90×15; 90×16; 90×18; 90×20; 90×22; 90×25; 100×12; 100×14; 100×16; 100×18; 100×20; 100×22; 100×25; 120×12; 120x 14; 120×16; 120×18; 120×20 … |
| Width range | from 44.5 mm to 140 mm |
| Thickness range | from 6 mm to 59 mm |
| Length range | from 3000mm to 7000mm |
| Components | Cutting flat bar, Semi-leaf spring etc. |
| Package | Bundle |
| Standards implemented | ISO9001-2015, GB/T 33164.1-2016, JIS, DIN, ASTM |
| Payment | TT, LC, DP |
| Lead time | About 30 days |
| MOQ | 10 tons |
Parameters
| Available sizes of spring steel flat bars (With x Thickness)(mm) | ||||||
| 44.5×6 | 60×6 | 70×6 | 75×10 | 80×10 | 90×10 | 100×12 |
| 44.5×8 | 60×7 | 70×7 | 75×11 | 80×11 | 90×11 | 100×14 |
| 45×6 | 60×8 | 70×8 | 75×12 | 80×12 | 90×12 | 100×16 |
| 45×8 | 60×9 | 70×9 | 75×13 | 80×13 | 90×13 | 100×18 |
| 50×6 | 60×10 | 70×10 | 75×14 | 80×14 | 90×14 | 100×20 |
| 50×7 | 60×12 | 70×11 | 75×15 | … | 90×15 | 100×22 |
| 50×8 | 60×14 | 70×12 | 75×16 | 90×16 | 100×25 | |
| 50×9 | … | 70×13 | 75×18 | 90×18 | 120×12 | |
| 50×13 | 70×14 | … | 90×20 | 120×14 | ||
| … | … | 90×22 | 120×16 | |||
| 90×25 | 120×18 | |||||
| … | 120×20 | |||||
| … | ||||||
| Remark:Other sizes are available according to customers’ request | ||||||
| Spring flat bar grade correspondence table | ||||||
| S/N | GB | ISO | AISI | JIS | BS | NF |
| 1 | 60Si2Mn | 61SiCr7 | 9260 | SUP7 | 250A58 | 61SC7 |
| 2 | 55CrMnA | 55Cr3 | 5155 | SUP9 | 55Cr3 | |
| 3 | 60CrMnA | 65MnCr4 | 5160 | SUP9A | ||
| 4 | 50CrVA | 50CrV4 | 6150 | SUP10 | ||
| 5 | 60CrMnBA | 60CrB3 | 51B60 | SUP11A | ||
Production & Packaging
Production
To see how our quality leaf springs are manufactured, please visit our YOUTUBE channel:
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We pride ourselves on our large-scale production capabilities and advanced technology. Our workshops are designed for efficiency and precision, allowing us to consistently produce high-quality **spring steel flat bar**. Our skilled professionals and vast land area enable us to meet the demands of both domestic and international markets, ensuring a reliable supply for our clients.
Packing
Our spring steel flat bars are carefully bundled and prepared for safe container loading, guaranteeing that your order arrives in excellent condition, ready for use.
In addition to our spring steel flat bars, WONDEE Autoparts also offers a wide range of other semi-trailer components, as seen in the collection below:
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