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Suspension Coil Spring Replacement Service and Cost. What is a coil spring? Coil springs allow the vehicle to absorb bumps, and keep the passenger comfortable. The coil springs hold the weight of the vehicle, and allow the wheels to travel vertically when the wheels encounter an obstacle.
Open Coil. From Mattressman Wiki. An open coiled spring unit with a support rod edging. Open Coil springs are a type of spring formation, with springs arranged in a sideways rows, and joined together by a thinner wire on the top and bottom of each spring. Open Coil is the most common type of Spring System. Also known as: Bonnell Springs, Coil Spring, Cage Sprung, Box Springs.