Power Strut Clamping nut with long spring, features steel construction with electro-galvanized finish for added corrosion and longer endurance. It has thread size of 1/2 - 13. This 1/2-Inch nut is suitable for use with PS 200, PS 210 and PS 300 channel. Case hardened nut meets ASTM A576 GR1015M and ANSI B1.1 standards.