Overview Reviews Product Description Hex head cap screws are used to secure an object within or against another object. 18.8 stainless steel fasteners have excellent corrosion resistant qualities and are an excellent choice for general use and outdoor applications. Papco Bolts Catalog Product Videos Custom Field Box quantity 50 Diameter 5/16"-18 Length 2-1/2" Product Reviews Write a Review Write a Review × Paulin 5/16"-18 x 2-1/2" UNC 18.8 Stainless Steel Hex Head Cap Screw 50 Pc. 5011-453 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *