Extension Spring Sizes


An assortment of several different measurements of extension springs ranging from micro springs, small springs, medium springs, large springs, and heavy duty springs.

Do you need a replacement spring or are working on a project? Find your extension springs at The Spring Store where we offer a broad range of tension spring sizes in various material types such as music wire (spring steel), hard drawn, stainless steel, oil tempered, beryllium copper, and phosphor bronze. Some of these springs may be plated in zinc, black oxide, or gold irradite.

Our ranges of extension spring sizes are below:

  • Outer Diameters from 0.063” (1.600 mm) to 2.500” (63.500 mm)
  • Length Inside Hooks from 0.220” (5.588 mm) to 28.5” (723.900 mm)
  • Wire Diameters from 0.007” (0.178 mm ) to 0.375” (9.525 mm)
extension spring sizes and measurements

micro extension spring sizes

small extension spring sizes

medium extension spring sizes

large extension spring sizes

Search for your extension spring by using our easy-to-use tension spring finder. Enter your tension spring dimensions into the specified input boxes provided and hit the search button. You will be directed to a page which includes all the extension spring part numbers which have similar tension spring measurements to the extension spring sizes you specified.

Calculate your extension spring’s size by using our new spring calculator, Spring Creator. Spring Creator will allow you to calculate your tension spring’s size as well as other important dimensions to your project or device including rate, maximum travel, initial tension and working loads. Also, get a PDF blueprint of your extension spring sizes along with a full spring analysis of your tension spring design.

heavy duty extension spring sizes

Download Our Extension Springs Catalog

extension spring catalog

Visit Our Spring Calculator

Spring Creator

extension spring calculator, Spring Creator