Torsion Spring Inside Diameter Converter

New Spring Length:  

The purpose of this program is to allow you to convert from one inside diameter of torsion spring to another inside diameter.

The most 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. 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.

Standard cones.

Recommended cones

No cones made. Add all for the current ID and only the checked ones for new ID, assuming they need cones. Otherwise they'd reuse their old cones and keep the same ID.