18% chromium and 8% nickel for good corrosion resistance

7/8-9 x 3 Hex Cap Screw SS 18-8 (A2)

1/2-13 x 9 Socket Cap Screw Alloy

3 up the shank to tightly draw the decking to the substrate

Nominal Size: 1 1/2 inch

8 x 2 Simpson Bugle-Head Wood Decking Screws - Square Drive T17 316 SS - Bulk Pail (3000) 7/8-14 Socket Cap Screws Alloy 18% chromium and 8% nickel8 x 2 Simpson Bugle Head Wood Decking Screws Square Drive T17 316 SS Bulk Pail (3000) . The type 17 tip provides fast starting and resists splitting in hardwood. Coarse threads run approximately 2 3 up the shank to draw the decking tightly to the substrate. Pre drilling is recommended near board ends to prevent splitting. 316 stainless steel is ideal where superior corrosion resistance is required.