The purpose of this program is to allow you to convert from one inside diameter of torsion spring to another inside diameter.
The more common reasons for doing this include converting from older springs with obsolete hardware, and increasing cycle life with bigger springs that won't fit in the shaft space without increasing the inside diameter.
This program does not allow for converting wire sizes to change the strength of your springs. Tools for doing this are on our Standard Garage Door Torsion Springs page.
When converting the inside diameter it is helpful to remember that a torsion spring consists of a given length of wire that is coiled around a rod. For example, increasing the diameter of the rod reduces the number of times the wire wraps around the rod, hence, shortening the length of the spring. In contrast to this, the spring will be longer if the inside diameter is reduced. Same amount of wire - same spring weight - same IPPT - same torque - same lift properties.
The "Current ID" pull down menu displays all the inside diameters that have been used on sectional garage doors since manufacturing began. The end cones for many of these inside diameter springs are obsolete.
When converting to a different inside diameter, it is important to convert to a new inside diameter for which cones are made. The more common inside diameters include 1 3/4," 2," 2 5/8," 3 3/4," 5 1/4," and 6." OEM cones are also made for springs with the following inside diameters: 2 1/4" (Raynor), 3 3/8" (OHD), 5 1/2" (Raynor), 5 7/8" (OHD), and 7 5/8" (OHD). The cones for springs with these inside diameters are much more expensive, and we recommend converting to standard cones when possible.
If your old obsolete cones are in good shape, you can usually order new springs to fit them. It is important to order the correct springs. One reason is that they are not returnable. The other reason is that the older springs had unique inside diameters and special ends. For example, many of the old Crawford doors have 1 19/32" I.D. springs, and the ends are extended to lock into the cones. Many of the BarCol springs had 1 13/16" ID springs and they are often hooked on the ends. Overhead Door has springs with ends that are bent up to fit into special clips.