Pre-drilling is recommended near board-ends to prevent splitting

3/4-10 x 3 3/4 Hex Cap Screw SS 18-8 (A2)

which means you can place them close to each other without having to worry about compromising structural integrity

1 1/8-7 x 15 Socket Cap Screw Alloy

14 x 4 TimberLOK® Heavy Duty Wood Screw (12)

3/4-10 x 1 3/4 Socket Set Screw Cup Point 18-8 (A2) Stainless Steel Phillips Flat Self Drilling Cement Board Screws with Wings Pre-drilling is recommended near board-ends3 4 10 x 1 3 4 Socket Set Screw Cup Point 18 8 (A2) Stainless Steel . A headless screw threaded the entire length. It has a hexagonal drive at one end and a cup shaped indentation at the other end. The cup point is the most used style set screw. Designed for fast, permanent and semi permanent location of parts on shafts with hardness differential of 10 15 Rockwell C points and where cutting in of cup edge on the shaft is acceptable. Stainless Steel 18