The cup point is the most used style set screw

5/8-11 x 3 1/4 Hex Cap Screw SS 316 (A4)

The high strength

5/8 x 12 Hex Lag Screw Hot Dipped Galvanized

10 x 2 1/2 Simpson Flat-Head Deck-Drive™ DWP Wood Screws - 6-Lobe Drive 316 SS - Deck Pack (350)

1/2-20 x 4 Socket Set Screw Cup Point Alloy Jobber Drill Bits - Wire Gauge The cup point is the1 2 20 x 4 Socket Set Screw Cup Point Alloy . 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. Hardness: Rockwell C45 53.