That’s not a very soft mattress! When deflected 3-inches the spring is supporting 600 lbs.

Therefore, the spring has a Load Rate of 600 lbs. Definition: Spring rate, also known as spring constant, is the constant amount of force or spring rate of force it takes an extension or compression spring to travel an inch of distance or, in the metric system of measurement, a millimeter of distance. If we look at another mattress, we could get one where it would only take 250 pounds of fat guy to sink one inch down.

This spring needs to reach a solid height of 3 inches, therefore having to travel 2 inches. Load Rate is the amount of weight a spring is designed to carry at a certain height. Spring Load. FRONT COIL SPRING RATE RECOMENDATION CHART WARNING, FIRST GEN COILS ARE 5" OD, SECOND GEN COILS ARE 5.5" OD CSPWD - Coil Spring Wire Diameter (How thick is the wire?). The calculation to find the rate of a coil spring is: 11,250,000 times the wire diameter to the 4th power divided by 8 times the active number of turns times the mean diameter cubed. Normal coil springs are linear. You have a spring with a free length of 5 inches and your spring rate is of 7.5 pounds of force per inch (lbf/in). So a 400 pound fat guy sinking one inch into a mattress gives us a Mattress Rate of 400 pounds.

CLICK HERE FOR A MOOG COIL SPRING SPEC TABLE there are many more in the catalog but these have the correct type ends for a first gen Camaro. Coilover Spring Rates - Spring Is Sprung ... Progressive CoilsAs an aside to the above, variable rate springs are also available. Not coils seated.

The units of measurement of rate in the English System are, lbf/in (pounds of force per inch) or N/mm (newtons per millimeter) in the Metric System. Springs don't loose rate with age, they loose height, they will bend or sag with age. Active turns are the number of turns of the spring that do not touch anything. Let's say a spring has: A rate of 200 lb/in. Designed for a 3-Inch deflection. NOAC - Number Of Active Coils (Coils that are free to move. That’s a noticeably softer mattress at a … Coil Spring Rate Formula: 11,250,000 - Torsional Modules For Steel (Constant).

It may be that 1/2 of the top and bottom coil is seated causing a spring with 8 coils to have the distance of 7 free.) When a spring takes a "set" the rate of the coil has not changed, only the amount of load it will handle does. This example shows you how spring load works and how it is derived from spring rate.

For example, if you have a 10" free length spring, at 100 pounds per inch rate… Rate and Load Rate are two totally different animals.

8 - Constant.

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