Spring Lead of Bogie for Heavy Vehicle

Our company is in Shijiazhuang , near Beijing .
There are five main product series :
1.(1)Bogie assembly(2)Bogie parts
2.(1)Gemanic axle series(2)Gemanic axle parts
3.(1)Mechanical Suspension assembly(2)Mechanical Suspension parts
4.(1)Air Suspension assembly(2)Air Suspension parts
5.(1)American Axle series(2)American Axle parts
6.Other parts(1)Single Air Brake Chamber(2)Double Air Chamber(3)Common Elevating Twist Lock(4)Casting Elevating Twist Lock(5)King Pin(6)Fifth Wheel(7)Landing Gear