Spring with Locknut Carbon Steel 7/16in 20 Thread Spring for Trailers Feature:1. Usage: Keep trailer suspensions lubricated with spring to install the double eye or slipper style axle springs to hanger brackets or equalizers.2. : The out diameter of the spring is 9/16in, the length is 3in, and the thread is 7/16in 20, professional manufacturing.3. Special Design: Knurled shoulder can effectively prevent the in hanger bracket, which is more firm and convenient to use.4. Greaseable: Designed to be more robust than the original standard equipment and can be lubricated in some cases for ease of service and longevity.5. High Strength: Spring with locknut is made of carbon steel material, with zinc plated, high strength, rustproof, sturdy, not easy to crack.Specification:Item Type:SpringMaterial: Carbon SteelProcess: Zinc plated NutSize:9/16in x 3in(OD x L)7/16in- 20 ThreadPackage List:10 xSpring