138334003 Spring Nut, Nut Shape U Style Spring Nut, Nut Finish Phosphate, Nut Material Steel, Minimum Panel Thickness 0.025 in, Maximum Panel Thickness 0.15 in, Overall Width 0.67 in, Overall Length 0.98 in, Hole Center to Outside Edge 0.5 in, System of Measurement Inch, Thread Size 5/16 In.-18, Cage Finish Phosphate, Cage Material Steel, Clip-On Style U, Color Black, For Use in Systems Automotive, Furniture/Lawn, Garden Applications, Heavy Truck, HVAC, Lock Type Distorted Thread