Simpson 5" x 40d Smooth Shank Common Nail, 316 Stainless Steel, 6 Ga.Model No. T40CNB Coating Material. Type 316 Stainless Steel Gauge. 6 Penny size. 40d Length (in.) 5 Head Diameter (in.) 7 16 Shank Diameter (in.) 0. 203 Shank Type. Smooth Shank Head Type. Full Round Head Head Pattern. Smooth Head Point Type. Diamond Point Approx. Count. 25 Lb (475) This Simpson Strong Tie Decking and General Wood Construction Common Nail features a smooth shank for a variety of construction applications, available in type 316