Standard Compression Springs

Definition: Standard compression springs are those made using standard fractional sizes.

The stock compression springs you will find here are manufactured using the standard sizes taken from the standard drill size chart. These fractional sizes are in sixty-fourths, unless they are converted to a simpler fraction such as thirty-secondths, sixteenths, eighths, quarters, or half. The measurements equivalent to each fractional size are provided in the chart below.

STANDARD FRACTIONAL DRILL SIZE CHART

1/64 = 0.0156 1/32 = 0.0313 3/64 = 0.0469 1/16 = 0.0625
5/64 = 0.0781 3/32 = 0.0938 7/64 = 0.1094 1/8 = 0.1250
9/64 = 0.1406 5/32 = 0.1563 11/64 = 0.1719 3/16 = 0.1875
13/64 = 0.2031 7/32 = 0.2188 15/64 = 0.2344 1/4 = 0.2500
17/64 = 0.2656 9/32 = 0.2813 19/64 = 0.2969 5/16 = 0.3125
21/64 = 0.3281 11/32 = 0.3438 23/64 = 0.3594 3/8 = 0.3750
25/64 = 0.3906 13/32 = 0.4063 27/64 = 0.4219 7/16 = 0.4375
29/64 = 0.4531 15/32 = 0.4688 31/64 = 0.4844 1/2 = 0.5000
33/64 = 0.5156 17/32 = 0.5313 35/64 = 0.5469 9/16 = 0.5625
37/64 = 0.5781 19/32 = 0.5938 39/64 = 0.6094 5/8 = 0.6250
41/64 = 0.6406 21/32 = 0.6563 43/64 = 0.6719 11/16 = 0.6875
45/64 = 0.7031 23/32 = 0.7188 47/64 = 0.7344 3/4 = 0.7500
49/64 = 0.7656 25/32 = 0.7813 51/64 = 0.7969 13/16 = 0.8125
53/64 = 0.8281 27/32 = 0.8438 55/64 = 0.8594 7/8 = 0.8750
57/64 = 0.8906 29/32 = 0.9063 59/64 = 0.9219 15/16 = 0.9375
61/64 = 0.9531 31/32 = 0.9688 63/64 = 0.9844 64/64 = 1.0000

Since there are billions of possibilities, and numerous combinations of your compression spring’s dimensions, having standard sizes is the best solution. Even then, our stock compression spring catalog has over 18,000 standard compression spring designs. So if you need a 1/4” OD by a 7/8” free length, you can definitely find it here!

Using Spring Finder (our search stock springs tool) you can easily navigate and find the spring you need in our standard compression spring catalog >. Spring Finder will find your spring within the measurements you provide.

The basic inputs are: outer diameter, free length, and spring rate. In the basic search you may enter one of those three attributes in either the English or Metric system of measurement.

For a more advanced search, you can add working loads, travel, or other physical dimensions. To do so, you must select “Search More Fields” and enter one or more of the following inputs: travel, load, wire diameter, total coils, inner diameter, and/or solid height. All of the above dimensions and specifications are entered in ranges. This will allow you to set your own tolerances based on your own knowledge of the product it will be used in.

standard compression springs off the shelf

Once you click “Search” you will be redirected to a standard compression spring results page. The results are provided on a table where you’ll see the unit price, our part number, and the spring dimensions.

There are a couple of dropdown menus that will allow you to organize the list of results based on a certain dimension or view more products within the same page. This means you can organize the list by free length, travel, wire diameter, spring rate, etc. The second dropdown will allow you to view 15 to 200 products per page.

find standard compression springs on tablet using search stock springs tool

Choose the spring that best matches your requirements. If you are interested in testing and prototyping, the chart will also help you select other springs which you may want to try.