A length of flat spring steel plates bent in an arch usually with curled ends (eyes) to allow mounting to the frame. The eyes are usually filled with rubber bushings to reduce noise when the leaf springs flex. A bolt through the front eye secures the spring to the frame, and a pin through the rear eye attaches the spring to a shackle. Another pin attaches the shackle to the frame. The pivoting shackle accommodates the changes in the effective length of the spring as it flexes. The axle housing is secured to the leaf spring with two U-bolts on either side.