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OEM TRA Series Leaf Springs for Light Duty Trailer

Short Description:

Part No. TRA 2740 Paint Electrophoretic paint
Spec. 76×24 Model TRA Series
Material SUP9 MOQ 100 SETS
Free Arch Left149mm±6,Right135mm±6 Development Length 1159
Weight 32 KGS Total PCS 3 PCS
Delivery Time 15-30 days Warranty 12 months

Product Detail

Product Tags


Structure chart

The leaf spring is suitable for TRA Series

1. The item total has 4 pcs, the raw material size is 76*24 for all
2. Raw material is SUP9
3. The left free arch is 149±6mm and the right free arch is 132mm±6, the development length is 1159, the centre hole is 13.5
4. The painting use electrophoretic painting
5. We also can produce base on client's drawings to design

TRA series leaf springs:

No. Name No. of Leaves Weight Specification
(kg) (mm)
1 TRA2726 3 26.27 76×20
2 TRA2727 3 25.83 76×20
3 TRA2728 3 25.59 76×20
4 TRA3343 10 69.02 100×11
5 TRA2705 7 44.83 75×13
6 TRA2260 8 48.6 75×13
7 TRA2256 7 41.21 75×13
8 TRA3319 9 53.17 75×13
9 TRA2297 9 51.71 75×13
10 TRA2270 8 49.82 75×13
11 83-115 14 54.6 75×10
12 TRA2752 2 25.68 76×24
13 TRA2754 2 25.35 76×24
14 TRA2740 3 31.03 76×24
15 TRA2741 3 30.8 76×24
16 TRA021 1 18.5 76×35
17 TRA023 1 18.58 76×35
18 TRA699 4 29.86 76×20
19 TRA693 3 25 76×20
20 TRA038 1 22.31 76×40
21 TRA035 1 18.04 76×35
22 55-896 8 68.8 100×11
23 TRA3340 3 29.6 76×20
24 TRA2291 3 27.27 76×20
25 59-400 3 73.26 100×22
26 TRA2160 8 48.3 75×13
27 TRA696 9 51.03 75×13
28 TRA693 3 26 76×20
29 TRA1492 3 30 90×20
30 TRA3341 3 26.2 76×20


Structure chart

What do you need to know about parabolic leaf springs?

Leaf springs are an integral suspension part of wheeled vehicles. These support the weight of the vehicle and its cargo. If you were to discuss this topic with mechanics or automotive enthusiasts, then you might encounter the term “parabolic leaf springs”. These are a variation of the leaf spring that provides plenty of benefits for your vehicle, including improving ride quality. As stated earlier, a leaf spring is an important part of a vehicle’s suspension system. This component is made up of layers of steel that vary in size. Most forms of leaf springs are formed into an elliptical shape to allow the component to flex when pressure is added. Leaf springs were widely used as early as medieval times. Back then, they were called carriage of laminated springs. Most old vehicles had them on.

Today, you will find leaf springs in trucks and vans that are required to carry heavy loads. The overall purpose of a leaf spring is to provide support to a vehicle and create a smoother ride by absorbing bumps. It also affects how high the vehicle rides and maintains the tire alignment while on the road. There are several variations to a leaf spring. You’ll find standard leaf springs and also parabolic leaf springs from automotive parts suppliers. A parabolic leaf spring is made up of a leaf or set of leaves that are tapered from the middle to the ends. The middle is thicker compared to the ends. A standard leaf spring is typically made up of multiple leaves, with each leaf longer than the one below. For standard semi-elliptical leaf springs, each leaf is made with a different length but with equal thickness from one end to the other. The more load you require, the thicker the leaves need to be and the more leaves you need. Compared to a standard leaf spring, a parabolic leaf spring is made up of fewer leaves and the ends are tapered. The shape is semi-elliptic, like most leaf springs. Other than that, the parabolic leaf spring’s design is made such that only the center and ends of the spring are touching. This provides an advantage of preventing inter-leaf friction. Since the leaves taper from end to center, it results in an evenly distributed stress across the spring. This leads to a quieter and more comfortable ride. With standard leaf springs, the leaves are clamped together, which means that there could be more friction between the leaves.



Provide different types of leaf springs which include conventional multi leaf springs, parabolic leaf springs, air linkers and sprung drawbars.
In terms of vehicle types, it include heavy duty semi trailer leaf springs, truck leaf springs, light duty trailer leaf springs, buses and agricultural leaf springs.

Packing & Shipping


QC equipments


Our advantage

1) Raw Material

Thickness less than 20mm. We use material SUP9

Thickness from 20-30mm. We use material 50CRVA

Thickness more than 30mm. We use material 51CRV4

Thickness more than 50mm. We choose 52CrMoV4 as the raw material

2) Quenching Process

We strictly controlled the steel temperature around 800 degree.

We swing the spring in the quenching oil among 10 seconds according to the spring thickness.

3) Shot Peening

Each assembling spring set under stress peening.

Fatigue test can reach over 150000 cycles.

4) Electrophoretic Paint

Each item use electrophoretic paint

Salt spray testing reach 500 hours

Technical aspect

1、Product technical standards:implementation of IATF16949
2、More than 10 spring engineers' support
3、Raw material from the top 3 steel mills
4、Finished products tested by Stiffness Testing Machine, Arc Height Sorting Machine; and Fatigue Testing Machine
5、Processes inspected by Metallographic Microscope, Spectrophotometer, Carbon Furnace, Carbon and Sulfur Combined Analyzer; and Hardness Tester
6、Application of automatic CNC equipment such as Heat Treatment Furnace and Quenching Lines, Tapering Machines, Blanking Cutting Machine; and Robot-assitant production
7、Optimize product mix and reduce customer purchasing cost
8、Provide design support,to design leaf spring according to customer cost

Service aspect

1、Excellent team with rich experience
2、Think from the perspective of customers, deal with the needs of both sides systematically and professionally, and communicate in a way that customers can understand
3、7x24 working hours ensure our service systematical, professional, timely and efficient.

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