P500 Series

Log In to Order

  • The "P"

    The "P" in the part number stands for Plug-End, which refers to the style of the spring's end. You'll see this type of end in the product photo.

  • The "5"

    The first number after the "P", in this case, 5, refers to the gauge of the wire. The P500 Series is the second biggest in the "P" series.

  • The Last 2 Numbers

    The last two numbers in the spring code (like "20" or "42") tell you the length of the spring, measure in inches. So if you see "20", that means the spring is 20 inches long, not including the end.

Our In-Depth Manufacturing Process

Spring Weight

P520 = 4.8 LBS

P528 = 7.0 LBS

P530 = 7.5 LBS

P532 = 8.0 LBS

P536 = 9.0 LBS

P542 = 10.5 LBS

Spring Length

The length has nothing to do with the weight of the door, but everything to do with the height of the door. 

P520 = 6'6" High

P528 = 7'0" High

P530 = 7'6" High 

P532 = 8'0" High

P536 = 9'0" High

P542 = 10'0" or Higher

Initial Tension

The initial tension is determined by how many pounds of pull force it takes to stretch the spring 1 inch. 

All of our P500 Series springs, lengths 20-42 have an intial tension of 135-145

Wire Type

All of our springs are composed of ASTM (American Society for Testing and Materials) 229 oil-tempered wire. 

This specific one-piece extension spring uses 5 gauge wire which refers to the thickness of the wire.

Compatible Hooks

The style of hook is dependent on the amount of springs being used. 

For 1 spring, C-Hooks will be used. 

For 2 springs, W-Hooks will be used.