Overview Reviews Product Description Spaenaur Master Catalog Product Videos Custom Field Package quantity 100 Product Reviews Write a Review Write a Review × Spaenaur Thread-Cutting Screw Indented Hex Washer Head Type F 5/16"-18 Unc X 5/8" L (Hd 1/2" Af) Low Carb Steel Case Hard Zinc Plate Ansi B18.6.4-1966 ST-686H Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *