You can use these 3½” FlatLOK screws for fastening multi-ply beams and girder trusses

1/2-13 x 5 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (100)

They are actually stronger than most metal and chemical anchors

1/2-20 x 7 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (20)

making these screws a trusted solution for securing treated lumber

#10 x 2 1/2 Simpson Deck-Drive™ DSV WOOD Quik Guard® Coating Screw (T25 6-Lobe) Red - Box (350) 3/4-10 Socket Cap Screws 18-8 Stainless Steel You can use these 3½”Achieve a flawless finish on your redwood or cedar deck with this contractor pack of 350 red Simpson Deck Drive DSV WOOD screws. These #10 x 2 1 2" screws are made from high strength, heat treated steel and feature Simpson's proprietary Quik Guard coating for long lasting durability in exterior environments. The combination of a T25 6 Lobe drive, torque reducing serrated threads, and a clean countersinking head makes these screws a top choice for