Overview Reviews Product Description 5/16 inch x 18TPI Hex Coupling Nut-Fully Threaded-Zinc Plated-UNC Product Videos Custom Field UOM EA Product Reviews Write a Review Write a Review × 5/16-18 COUPLING NUT 5 UNC PLTD Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *