leaf spring
1.high quality
2.reasonable price
3.military enterprise supplier
4.main customers:FAW.MAN,VOLVO.SCANIA,etc

Suspension System Leaf Spring Parts


1. Enterprise Introduction:

Qingdao Jasper International Trading Co., Ltd is the Imp. & Exp. Dept. of our factory.

1)Time of establishment: April 2007

2) Registered capital: 670 million Yuan

3) Floor area: 170,000 square meters

4) Number of staffs: nearly 500 people

5) Main products: Automobile leaf springs Stabilizer bar (Solid, Hollow) Guide arm Air Suspension Engine valve spring

6) Production capacity:

Production line of leaf springs: 5 Annual output: 60,000 tons

Production line of stabilizer bar: 2 Annual output: 300,000 pieces

Production line of coiled spring: 2 Annual output: 20 million pieces

2. Product Advantages:

1) Supplier of China Military Enterprise(At the beginning of 2009,leaf spring and stabilizer bar were listed into the appointed products for military use by SINOTRUK and the appointed export products.), FAW,SINO-TRUK & VOLVO Asia.

2) High quality & Reasonable price & Excellent service.

3) Relevant technology certificate: ISO/TS16949 ISO9001 ISO14001 OHSAS18001            

4) Rich experience in manufacturer & innovate

3. Product Development:

1) The company makes use of CAE finite element analysis and other software, possesses independent testing and detecting center machine, fatigue testing machine and other advanced testing and detecting equipments, and owns the ability of making further study and analysis on optimizing automotive suspensions, vibration matching, car loading suitability, product reliability, failure mode analysis and other aspects.

2) The company undertakes design, research and development of suspension system in the cooperation project of SINOTRUCK and Germany Man Company.

4. Production details (leaf spring):

1) Specification: Single,Multiple,Parabolic,Variable cross-section,Z-type,etc.

2) Color: Shinning Black,Dark Black,Grey,Blue or Customized

3) Conventional Raw Material:

China: 60Si2Mn,55CrMnA,60CrMnA America: SAE9255,9260,6150

Germany: 60Si7,65Si7,60SiCr7,55Cr3,51CrV4,58CrMnB4


4) Conventional size: Width44.5-130mm'Thickness6-32mm

5) Supplier of Raw Material: Xing Cheng Steel,Fang Da Steel,Qingdao Steel

6) Convention Applicaion: Suspension parts of Truck,Trailer,Bus,Cross Country Vehicle:VOLVO,MAN,SCANIA,YORK,FORD,DAF,IVECO,NISSAN,ISUZU,HINO,STYER,BPW,KAMAZ,UAZ,SINOTRUK,FAW,ZHONGTONG,etc.

7) Price of FOB Qingdao Port: USD1-1.5/KG

8) Minimum Order Quantity: 20 Tons/Any quantity for conventional size.

9) Terms of Payment: L/C ,T/T or Westunion

10) Lead Time: 20-30 days after deposit.

11) Conventional Package: Wooden pallets or polywood cases banded by iron bands and stretch wrap film or customized

5. Production Process(leaf spring):

Multi-leaf springs are made as follows:

1.Shearing of flat bar

2.Center hole punching / Drilling

3.End Heating process forming (hot & cold process)

1).Eye Forming / Wrapper Forming

2).Diamond cutting / end trimming / width cutting / end tapering

3).End punching / end grooving / end bending / end forging / eye grinding

4).Center hole punching / Drilling / nibbing

4.Heat Treatment


2).Camber forming



5.Surface preparation

1).Shot peening / stress peening


6.Eye bush preparation process

1).Eye reaming / eye boring

2).Bush insertion

3).Bush reaming


1).Presetting & load testing

2).Paint touch-up

3).Marking & packing




FOB Price: US $ 1 - 1.5 / Kilogram |
Minimum Order: 20 Ton/Tons Any quantity for conventional size
Payment Terms: L/C,T/T,Western Union

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