Leaf Spring

Premium leaf springs from Tianjin Juming: made of 60Si2Mn, 55Si2Mn, 65Mn alloy spring steel with high strength, high elastic limit and long fatigue life. Custom sizes for trucks, trailers, construction, agricultural and mini vehicles. Strict QC, anti-rust packaging, fast export via Tianjin Port.

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Product Description

Leaf spring is the most widely used elastic element in vehicle suspension systems. It consists of several alloy spring leaves of equal width but varying length, forming an approximately uniform-strength beam that carries the load, absorbs road shocks and ensures stable, reliable running.

Manufactured from premium medium-high carbon alloy spring steel with precise forming and strengthening treatment, our leaf springs feature high strength, high elastic limit and excellent fatigue resistance, widely used in trucks, trailers, construction machinery and agricultural vehicles.

Key Advantages

Premium Spring Steel

Manufactured from 60Si2Mn, 55Si2Mn, 65Mn and other premium medium-high carbon alloy spring steels, with high tensile strength, high elastic limit and long fatigue life.

Scientific Leaf Structure

Designed according to the uniform-strength principle, with thickened main leaf and progressively arranged secondary leaves, balancing load capacity and ride comfort.

Precise Forming

Full-process control including hot rolling, blanking, eye coiling, quenching and tempering, and shot peening, ensuring uniform residual stress and high dimensional accuracy.

Anti-corrosion & Durable

Surface coating and anti-rust treatment adapt to harsh working conditions and significantly extend service life.

Full Range & Customization

Available as single leaves or complete assemblies; custom sizes available according to vehicle model, load and drawings.

Strict QC

Each piece inspected before shipment, with stable and consistent dimensions, hardness and performance.

Material & Standards

Raw materials comply with GB/T 1222 (Spring Steel). The main grades and approximate international equivalents are listed below (mechanical properties are for reference only, subject to the final inspection report):

GB Grade	International Equivalent	Standard	Tensile Strength	Yield Strength	Hardness
60Si2MnA	AISI 9260 / JIS SUP6	GB/T 1222	≥1274 MPa	≥1176 MPa	HRC 40–47
55Si2Mn	JIS SUP6 / DIN 55Si7	GB/T 1222	≥1274 MPa	≥1176 MPa	HRC 40–47
65Mn	AISI 1566 / SAE 1066	GB/T 1222	≥980 MPa	≥785 MPa	HRC 38–45

Specifications (Reference)

Custom sizes are available according to vehicle model and load requirements. Common specifications are shown below; other specifications are welcome for inquiry.

Size (T×W×L)	Layers	Application	Remark
13×75×1000mm	Multi	Light truck rear	Single leaf available
15×70×1600mm	Multi	Medium truck rear	Assembly available
20×90×860mm	Multi	Heavy duty / construction machinery	Thickened available
12×70×1100mm	Multi	Trailer & light truck	Single leaf available

Production Process

1. Hot-rolled steel bar cutting

2. End forming & punching

3. Eye (coil) forming

4. Quenching & tempering heat treatment

5. Shot peening

6. Leaf assembly

7. Dimension check & anti-rust coating

8. Final inspection & storage

Applications

Heavy, medium & light truck suspension systems
Semi-trailers, tractors, flatbed trucks
Agricultural machinery & tractor suspension systems
Construction & mining equipment
Electric tricycles, mini vehicles & trailers

Quality Control

Chemical composition analysis
Hardness & mechanical property testing
Dimensional & geometric tolerance inspection
Surface quality & fatigue performance control
Third-party inspection (SGS/BV) supported

Packaging & Shipping

Anti-rust oil/anti-rust paper + strapping + wooden pallets or cases
Sea, rail and road transport available
Located in Tianjin, near Tianjin Port, convenient export logistics and stable delivery

About Us

Tianjin Juming Steel Pipe Co., Ltd. is located in Daqiuzhuang Town, Jinghai District, Tianjin. It is a private enterprise specializing in metal product manufacturing and processing. It mainly produces steel-plastic composite pipes, plastic-coated steel pipes, electrical conduit pipes and other pipe products, and also undertakes metal material processing business.

Leveraging the industrial resources of the Daqiuzhuang steel cluster and mature production and testing facilities, we uphold the philosophy of “development through integrity, survival through quality, and win-win cooperation”. Leaf springs are our key product line for the auto parts sector, fully customizable to various vehicle types and working conditions. We sincerely welcome customers worldwide to cooperate with us.

Order & Service

Custom & OEM manufacturing according to drawings or samples; bulk orders welcome
Provide model selection and technical consultation, with professional team support
MOQ and lead time negotiable; favorable terms for volume orders
FOB / CIF / EXW trade terms supported

TIANJIN JUMING STEEL PIPE CO., LTD.

Address: Pangjiazhuang Village, Daqiuzhuang Town, Jinghai District, Tianjin, China (100 meters north of the Village Committee)

Add: Pangjiazhuang Village, Daqiuzhuang Town, Jinghai District, Tianjin, China

Products: Leaf Spring· Steel-Plastic Composite Pipe · Plastic-Coated Steel Pipe · Electrical Conduit Pipe

Hot Tags: Leaf Spring, China, Manufacturer, Supplier, Factory

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Contact Info

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Address

Pangzhuangzi Village, Daqiuzhuang Town, Jinghai District, Tianjin, China
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Tel

+86-18649193844
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E-mail

postmaster@qcxsteel.com

Send your inquiry to Juming Steel Pipe. We are a China Supplier providing advanced, quality customized steel products with professional & rapid response.