This spring assy are widely used in American for trailer .
Spring Measurements Specs
Totally 3 blades , 3pcs middle pads , End to End Measurement 1159 mm (Free Length Measurement), Tolerance range ±6mm ,A side Free Arch Measurement 146mm，Tolerance range ±6mm ,B side Free Arch Measurement 132mm,Tolerance range +6mm, Middle straight 203mm .
All datas are obtained by measuring the new produce product .
Parabolic Tra2740 Leaf Spring Are Made As Follows
Multi-leaf springs are made ...