1/4 x 3 Mushroom Spike Zinc Plated (100)

On diameters over 1 inch to 1 1/2 hardness will range from HRC 19-30

3/4-10 x 3 1/2 Flat Socket Cap Screw Alloy

6 x 2 Phillips Bugle Decking Screws W

Conform to ASTM F837

3/4-10 x 5 Socket Set Screw Cup Point Alloy Reduced Shank Drill Bits Cobalt - 1/2 Shank 1/4 x 3 Mushroom Spike3 4 10 x 5 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.