Overview Product Description Thread - UNF (FINE) Grade - High Tensile Grade 5 Material - Zinc Plated Steel Size - 1/4" - 28 Type - Flat head countersunk socket screws Product Videos Custom Field Product Reviews Write a Review Write a Review × 5/16" UNF Zinc Countersunk Socket Screws Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *